CN108709793B - Loading device and method for bending-torsion vibration fatigue test - Google Patents
Loading device and method for bending-torsion vibration fatigue test Download PDFInfo
- Publication number
- CN108709793B CN108709793B CN201810465097.1A CN201810465097A CN108709793B CN 108709793 B CN108709793 B CN 108709793B CN 201810465097 A CN201810465097 A CN 201810465097A CN 108709793 B CN108709793 B CN 108709793B
- Authority
- CN
- China
- Prior art keywords
- loading
- bending
- sliding
- sliding sleeve
- seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/26—Investigating twisting or coiling properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0026—Combination of several types of applied forces
- G01N2203/0028—Rotation and bending
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a loading device and a method for a bending vibration fatigue test, wherein a base is provided with a chute, two ends of the chute are provided with brackets, and the chute is connected with a vibration exciter; the base body is connected with the bracket through a bolt, two sides of the sliding sleeve are provided with rotating shafts, clamping rollers are arranged above the rotating shafts, and the rotating shafts are connected with the sliding seat and the shaft holes of the side plates; a guide rod is sleeved in the sliding sleeve, and one end of the guide rod is connected with the loading arm; the clamping seat of the loading arm is opposite to the chuck and is provided with a V-shaped groove, and a second coupling is arranged below the clamping seat. The platform has adjustability and enough clamping force to ensure the stability of the platform, and can provide pure torsion loading, torsion and transverse bending coupling loading, torsion and longitudinal bending coupling loading, torsion and oblique bending coupling loading and pure bending loading. The method has the characteristics of high precision, high efficiency, low cost and multiple functions, and has important practical value for completing the vibration fatigue performance test of test piece materials with rectangular sections and circular sections.
Description
Technical Field
The invention belongs to the technical field of material performance and material detection equipment, and particularly relates to a vibration fatigue test loading device and method for bending fatigue, torsion fatigue, bending-torsion coupling fatigue and the like.
Background
The fatigue is widely existed in the fields of aerospace, mechanical engineering and the like. To explore the fatigue properties of materials, the most common research method is experimental research. At present, a common fatigue testing machine is mainly suitable for the fatigue test of uniaxial loading such as tension, compression, bending and torsion. However, in engineering practice, the loads experienced by the machine structure tend to be multi-axis loads, with the bending-torsional coupling load being the most common form of load. Aiming at the fact that the traditional fatigue testing machine can only provide a single loading mode generally, the design of the vibration fatigue testing machine capable of realizing bending-torsion coupling loading has important significance.
The loads applied to the engineering structure are often combined tension, compression, bending, torsion and bending, such as the loads applied to a helicopter rotor blade, and are in a combined tension, bending and torsion loading state. At present, no fatigue tester can complete the composite loading of various loads. Moreover, most of the existing fatigue testing machines adopt a direct-acting driving actuator to complete tension-compression and bending loading, and adopt a rotary driving actuator to complete torsion loading. Therefore, the bending-torsion coupling loading is difficult to realize by directly utilizing the existing fatigue testing machine.
Disclosure of Invention
The invention provides a fatigue test method with wide application range and various loading functions, and simultaneously provides a corresponding fatigue test device, so as to solve the problem of the existing fatigue test machine in providing a multi-axis coupling loading mode, and obtain a test bed capable of testing fatigue performance of test pieces under various boundary conditions under common conditions.
In order to solve the technical problems, the invention adopts the following scheme:
a loading device for a bending-torsion vibration fatigue test comprises a base, a clamp, a loading arm, a sliding seat and a vibration exciter, wherein the base is provided with a sliding groove, two ends of the sliding groove are provided with brackets, and the vibration exciter is connected to the sliding groove; the base body of the clamp is U-shaped, notches are formed in two sides of the base body, the base body is connected with the support through bolts, the top of the base body is connected with the pressing plate through bolts, a cylindrical clamping rod is arranged in each notch, and a screw hole is formed in one side of the base body; the sliding seat is L-shaped, one side of the sliding seat is provided with a side plate through a screw, the other side of the sliding seat is opposite to the side plate and is provided with a shaft hole, two ends of the lower surface of the sliding seat are provided with ejector rods, and a first coupler is arranged between the ejector rods; the upper end of the vibration exciter is connected with the first coupling; the two sides of the sliding sleeve are provided with rotating shafts, clamping rollers are arranged above the sliding sleeve, and the rotating shafts are connected with the sliding seats and the shaft holes of the side plates; a guide rod is sleeved in the sliding sleeve, and one end of the guide rod is connected with the loading arm; the upper part of the clamping seat of the loading arm is connected with a chuck through a screw, the clamping seat is opposite to the chuck and is provided with a V-shaped groove, and a second coupling is arranged below the clamping seat.
Furthermore, a screw hole on one side of the seat body is connected with the three-jaw chuck through a screw rod.
Furthermore, scales are arranged on the guide rod.
A loading method of a loading device for bending vibration fatigue test comprises the following steps:
1) clamping the test piece through a chuck and a clamping seat;
2) when torsion loading is carried out, the guide rod is sleeved on the sliding sleeve, the sliding seat is connected with the vibration exciter through the first coupler, the clamping roller is loosened, the guide rod can freely slide along the sliding sleeve, the ejector rod below the sliding seat is loosened, the sliding sleeve is enabled to freely rotate in the sliding seat through the rotating shaft, and torque adjustment is realized by changing the position of the sliding sleeve on the guide rod and changing the output load of the vibration exciter;
3) when bending and twisting coupling loading is carried out, the clamping roller is screwed down, so that the guide rod cannot freely move along the sliding sleeve, the ejector rod below the sliding seat is loosened, the sliding sleeve freely rotates in the sliding seat through the rotating shaft, and transverse bending and twisting combined loading is realized under the condition that the vibration exciter vertically applies force; the clamping roller is loosened, the ejector rod below the sliding seat is screwed down, so that the sliding sleeve cannot freely rotate in the sliding seat through the rotating shaft, and under the condition that the vibration exciter vertically applies force, longitudinal bending and twisting combined loading is realized; the clamping roller and the ejector rod below the sliding seat are screwed down, so that the guide rod cannot freely move along the sliding sleeve, the sliding sleeve cannot freely rotate through the rotating shaft, and oblique bending and twisting combined loading is realized under the condition that the vibration exciter vertically applies force;
4) when pure bending loading is carried out, the guide rod is disassembled, the vibration exciter is moved to the lower part of the loading arm through the sliding groove, the vibration exciter is connected with the second coupling, and under the condition that the vibration exciter applies force vertically, pure bending loading is realized;
5) when the shaft test piece is tested, the three-jaw chuck is arranged on the inner side of the clamp above the supports at the two ends of the base, and the two ends of the shaft test piece are clamped by the three-jaw chuck, so that test piece testing loading is realized.
The adjustable platform has adjustability, has enough clamping force to ensure the stability of the platform, and can conveniently realize the conversion of the boundary mode of simple support and fixed support. The loading amplitude can be adjusted, and the requirements of test pieces with different lengths and different loading positions can be met. Pure torque loading, torque and transverse bending coupling loading, torque and longitudinal bending loading, torsion and bending coupling loading and pure bending loading may be provided. The testing machine overcomes the limitations of single function, difficult loading and the like of the existing fatigue testing machine, has the characteristics of high precision, high efficiency, low cost and multiple functions, and has important practical value for completing the vibration fatigue performance test of test piece materials with rectangular sections and circular sections.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic perspective assembly view of the present invention in a pure bend loading test condition;
FIG. 3 is a schematic view of the shaft test piece changing operation according to the present invention;
FIG. 4 is a perspective view of the clamp 4 according to the present invention;
FIG. 5 is a perspective view of an assembly structure of the sliding sleeve 6 and the sliding base 9 according to the present invention;
fig. 6 is a schematic perspective view of a connection structure of the loading arm 5 and the sliding sleeve 6 according to the present invention;
fig. 7 is a schematic perspective view of the loading arm 5 according to the present invention;
fig. 8 is an assembly view showing the state in which the chuck 4 is coupled to the three-jaw chuck 10 according to the present invention.
In the figure: 1-base, 11-chute; 2-a scaffold; 3-testing a sample; 4-clamp, 41-pressing plate, 42-seat, 43-clamping rod, 44-notch and 45-screw hole; 5-loading arm, 51-chuck, 52-holder and 53-second coupling; 6-a sliding sleeve, 61-a clamping roller and 62-a rotating shaft; 7-a vibration exciter; 8-a guide rod; 9-a sliding seat, 91-a side plate, 92-a first coupler and 93-a top rod; 10-three-jaw chuck.
Detailed Description
The invention is further illustrated by the following figures and examples. Referring to fig. 1 to 8, the loading device for bending vibration fatigue test comprises a base 1, a clamp 4, a loading arm 5, a sliding seat 9 and a vibration exciter 7, wherein the base 1 is provided with a sliding groove 11, two ends of the sliding groove are provided with brackets 2, and the sliding groove 11 is connected with the vibration exciter 7; a seat body 42 of the clamp 4 is U-shaped, notches 44 are formed in two sides of the seat body 42, the seat body 42 is connected with the support 2 through bolts, the top of the seat body 42 is connected with the pressing plate 41 through bolts, a cylindrical clamping rod 43 is arranged in each notch 44, and a screw hole 45 is formed in one side of the seat body 42; the sliding seat 9 is L-shaped, one side of the sliding seat is provided with a side plate 91 through a screw, the other side of the sliding seat 9 is opposite to the side plate 91 and is provided with a shaft hole, two ends of the lower surface of the sliding seat 9 are provided with ejector rods 93, and a first coupler 92 is arranged between the ejector rods 93; the upper end of the vibration exciter 7 is connected with a first coupler 92; the two sides of the sliding sleeve 6 are provided with rotating shafts 62, the clamping rollers 61 are arranged above the rotating shafts 62, and the rotating shafts 62 are connected with the sliding seats 9 and the shaft holes of the side plates 91; a guide rod 8 is sleeved in the sliding sleeve 6, and one end of the guide rod 8 is connected with the loading arm 5; a clamping head 51 is connected to the upper part of a clamping seat 52 of the loading arm 5 through a screw, the clamping seat 52 is opposite to the clamping head 51 and is provided with a V-shaped groove, and a second coupling 53 is arranged below the clamping seat 52. The screw hole 45 at one side of the seat body 42 is connected with the three-jaw chuck 10 through a screw rod. The guide rod 8 is provided with scales.
A loading method of a loading device for bending vibration fatigue test comprises the following steps:
1) clamping the test piece 3 through a clamping head 51 and a clamping seat 52;
2) when torsion loading is carried out, the guide rod 8 is sleeved on the sliding sleeve 6, the sliding seat 9 is connected with the vibration exciter 7 through the coupler 92, the clamping roller 61 is loosened, the guide rod 8 can freely slide along the sliding sleeve 6, the ejector rod 93 below the sliding seat 9 is loosened, the sliding sleeve 6 freely rotates in the sliding seat 9 through the rotating shaft 62, and torque adjustment is realized by changing the position of the sliding sleeve 6 on the guide rod 8 and changing the output load of the vibration exciter 7;
3) when bending and twisting coupling loading is carried out, the clamping roller 61 is screwed down, so that the guide rod 8 cannot freely move along the sliding sleeve 6, the ejector rod 93 below the sliding seat 9 is loosened, the sliding sleeve 6 freely rotates in the sliding seat 9 through the rotating shaft 62, and transverse bending and twisting combined loading is realized under the condition that the vibration exciter 7 vertically applies force; the clamping roller 61 is loosened, the mandril 93 below the sliding seat 9 is screwed down, so that the sliding sleeve 6 cannot freely rotate in the sliding seat 9 through the rotating shaft 62, and the longitudinal bending and twisting combined loading is realized under the condition that the vibration exciter 7 vertically applies force; the clamping roller 61 and the ejector rod 93 below the sliding seat 9 are screwed tightly, so that the guide rod 8 cannot move freely along the sliding sleeve 6, the sliding sleeve 6 cannot rotate freely through the rotating shaft 62, and under the condition that the vibration exciter 7 applies force vertically, oblique bending and twisting combined loading is realized;
4) when pure bending loading is carried out, the guide rod 8 is removed, the vibration exciter 7 is moved to the lower part of the loading arm 5 through the chute 11, the vibration exciter 7 is connected with the second coupling 53, and under the condition that the vibration exciter 7 applies force vertically, pure bending loading is realized;
5) when the shaft test piece is tested, the three-jaw chuck 10 is arranged on the inner side of the clamp 4 above the supports 2 at the two ends of the base 1, and the two ends of the shaft test piece are clamped by the three-jaw chuck 10, so that the test loading of the shaft test piece is realized.
Example 1: the following provides a preferred embodiment of the present invention. Taking a rectangular section beam test piece as an example:
firstly, a test device is installed, a test piece 3 is fixed on a clamp 4, nuts at two ends of a clamping rod 43 are adjusted, and when screws of a pressing plate 41 are tightly pressed, the end of the test piece 3 can be fixedly supported; when the nut of the pressure plate 41 is loosened and the screw of the clamping rod 43 is properly tightened, the end of the test piece can be simply supported. Meanwhile, it is convenient that when only one end is fixed, the fatigue performance of the cantilever mode of the test piece 3 can be tested. The loading arm 5 is convenient to mount, and the clamping seat 52 and the clamping head 51 are clamped at the position to be loaded by the test piece 3, and the fixing screw is screwed down. The hydraulic vibration exciter 7 needs to be installed according to a test mode to be performed, when a bending or pure torsion test is performed, the vibration exciter 7 is firstly connected with the first coupler 92 below the sliding seat 9, then the sliding sleeve 6 is sleeved on the guide rod 8, the guide rod 8 is installed and fixed on the clamping seat 52, the vibration exciter 7 is moved to find a proper vibration exciting position, the vibration exciter 7 is fixed by bolts along the sliding groove 11 of the base 1, and thus, the installation of the test device for the bending or pure torsion test is completed (as shown in fig. 1).
Then, according to the experimental requirements, the change of the loading mode is carried out by restricting the degree of freedom of the guide rod mechanism. When torsion loading is carried out, the clamping roller 61 is loosened, the guide rod 8 can freely slide along the sliding sleeve 6, the ejector rod 93 below the sliding seat 9 is loosened, the sliding sleeve 6 freely rotates in the sliding seat 9 through the rotating shaft 62, and torque adjustment is realized by changing the position of the sliding sleeve 6 on the guide rod 8 and changing the output load of the vibration exciter 7. When bending and twisting coupling loading is carried out, the clamping roller 61 is screwed down, so that the guide rod 8 cannot freely move along the sliding sleeve 6, the ejector rod 93 below the sliding seat 9 is loosened, the sliding sleeve 6 freely rotates in the sliding seat 9 through the rotating shaft 62, and transverse bending and twisting combined loading is realized under the condition that the vibration exciter 7 vertically applies force; the clamping roller 61 is loosened, the mandril 93 below the sliding seat 9 is screwed down, so that the sliding sleeve 6 cannot freely rotate in the sliding seat 9 through the rotating shaft 62, and the longitudinal bending and twisting combined loading is realized under the condition that the vibration exciter 7 vertically applies force; the clamping roller 61 and the ejector rod 93 below the sliding seat 9 are screwed tightly, so that the guide rod 8 cannot move freely along the sliding sleeve 6, the sliding sleeve 6 cannot rotate freely through the rotating shaft 62, and oblique bending and twisting combined loading is realized under the condition that the vibration exciter 7 applies force vertically.
When the pure torsion test is carried out, the vibration exciter 7 is connected with the second coupling 53 at the bottom of the clamping seat 52, and the guide rod 8 and the sliding seat 9 are completely detached (as shown in fig. 2).
When testing a shaft type test piece 3, a three-jaw chuck 10 is fixedly mounted on the inner sides of the clamps 4 above the supports 2 at the two ends of the base 1 by using screws through reserved hole positions 45, the schematic diagram of the mounting state is shown in fig. 8, and finally the test method is adopted to test and load the shaft type test piece 3 (shown in fig. 3).
After the vibration exciter 7 is installed, the switch of the vibration exciter 7 can be opened, and the required exciting force and exciting frequency are adjusted to meet the testing requirements, so that the test can be carried out.
A test piece 3 with a rectangular section or a circular section simulates the materials of beam-type and shaft-type parts in a test, the size proportion of the test piece 3 is required to be the same as that of an actual part, and the test piece 3 is made of materials with the same components, microstructures and mechanical properties, so that the actual test piece performance is truly and reliably restored. The test piece 3 requires the adoption of a component which is reduced in proportion to the actual working condition, and can also be prefabricated with a series of initial characteristics such as cracks and the like to research different fatigue damage states. The loading arm 5 clamps the test piece through a chuck 51 and a holder 52, the chuck 51 and the holder 52 are connected by screws, one end of the holder 52 is fixed with the loading guide rod 8, and the bottom of the holder 52 is provided with a second coupler 53 for realizing pure bending loading. The connection form between the vibration exciter 7 and the loading arm 5 is similar to a guide rod mechanism, the sliding sleeve 6 is sleeved on the loading guide rod 8, the bottom of the sliding seat 9 is connected with the vibration exciter 7 through a first coupler 92, pure torque can be transmitted by loosening the clamping roller 61, the clamping roller 61 is screwed up to be matched with a screw 93 which is arranged below the sliding seat 9 and used for controlling the pitch angle of the sliding sleeve, bending and twisting combined loading in different directions can be realized, the position of the vibration exciter 7 is moved to be connected with a second coupler 53 at the bottom of the clamping seat 52, and pure bending loading is realized. The loading guide rod 8 is provided with scales, so that the loading position can be conveniently recorded, and the excitation amplitude can be controlled.
The design of the loading member needs to realize the torsion and bending loading of the test piece 3. Therefore, the triangular notch clamp seat 52 and the clamp head 51 are selected for clamping, so that the torque and the bending moment can be transmitted to the test piece.
The freedom degree of the hinge is restrained by a screw locking mode, and the freedom degrees of the hinge slider connecting piece in different directions are controlled by adjusting the locking and opening and closing of the clamping roller 61 and the screw 93, so that the required loading condition is realized.
The loading arm 5 is manufactured by high-carbon steel, so that the rigidity of a loading component can be improved, and the influence of rigidity change of a test device on a test result is avoided.
The base 1 is processed by cast iron, so that the rigidity is ensured. Support 2 adopts cast iron processing, and the centre sets up the floor and guarantees intensity, designs T type spout 11 so that fixed vibration exciter 7 on the base 1, can fix the position of vibration exciter 7 through dedicated bolt to the regulation position that can be nimble. The bracket 2 is cast by cast iron, connected by bolts and the like, and the manufacturing cost is reduced as much as possible on the premise of ensuring that the use requirement is met. In addition, the natural frequency of the support member is selected to avoid the range of resonant frequencies under test. The size is large enough and the weight is large enough. The clamp 4 is designed for two sets of clamps with different rectangular sections and circular sections, wherein the clamp 4 of the rectangular test piece needs to realize modes of simple support, fixed support, one-end simple support and one-end fixed support and the like. Therefore, the fixing is properly realized by adopting the form of the clamp 4, and the design can be flexibly converted between simple support and fixed support.
The design of the clamp of the test piece 3 with the circular cross section needs to adopt the three-jaw chuck 10 for fixing, but needs to reserve the mounting hole 45 on the seat body 42, so that the clamp can be conveniently replaced during testing, and the testing time is saved. The clamping bar 43 is a solid roller with nuts on both sides, the roller is slightly shorter than the base of the clamp, and the roller is fixed by the nuts and the pressing plate 41. When the screw caps at the two ends are unscrewed and the pressing plate 41 is pressed tightly, the test piece is completely fixed; when the pressing plate 41 is unscrewed and the screw caps at the two ends of the clamping rod 43 are screwed down, the test piece 3 can freely rotate in the clamp, the beam can be simply supported, and the side face of the clamp is reserved with a mounting hole site 45 for mounting the three-jaw chuck 10, so that the clamp is convenient to change when a test piece with a circular section is tested. The two ends of the clamping rod 43 are provided with nuts and spring gaskets, so that the fixing strength of the roller can be ensured, and the anti-loosening effect can be achieved. All the screws and clamping parts selected by the connecting parts are all hexagon socket head cap screws and are in the same specification, so that the management and maintenance of tools in the future are facilitated.
The invention relates to a loading device for bending vibration fatigue test, which comprises the following components:
(1) the adjustable universal clamp has adjustability and enough clamping force to ensure the stability of the platform, the universal clamp 4 of the test piece 3 adopts a pressing block mode, and the conversion between simple support and solid support boundary modes can be conveniently realized by only adjusting the tightness of screws on two sides. If the length of the tested test piece is properly adjusted, the fatigue performance of the cantilever test piece can be tested.
(2) The combined design of the vibration exciter 7 and the loading device provides a load of the fatigue testing device, the loading amplitude can be adjusted, the loading arm is provided with scales, a proper test point can be conveniently found through adjustment, and the test bed base 1 is also provided with a plurality of sliding grooves 11 for fixing the vibration exciter 7, so that the requirements of test pieces with different lengths and different loading positions can be met.
(3) By adopting the hinge type sliding sleeve 6 structure, if the sliding sleeve 6 is not restrained from sliding along the axial direction, pure torque loading can be provided; if only the axial sliding of the sliding sleeve 6 is restrained, the torque and transverse bending coupling loading can be provided; if only the rotation of the hinge is restrained, the torsion moment and the longitudinal bending loading can be provided; if the sliding of the restricting sliding sleeve 6 along the axial direction and the rotation of the hinge are controlled, the torsion and bending coupling loading can be provided; pure bending loading can be provided if the fixing position of the connection is changed.
(4) The platform base 1 is provided with a long-strip-shaped bolt which is arranged in the sliding groove 11, the vibration exciter 7 can be fixed on the base 1 through the bolt, the position of the vibration exciter 7 can be conveniently adjusted, and a suitable test position can be found.
(5) The guide rod type loading arm 5 is clamped in a triangular notch mode, so that torsion and bending loading can be realized on a test piece with a circular section, torsion and bending loading can also be realized on a test piece with a rectangular section, and the device is strong in universality, reliable and convenient to clamp.
(6) The support 2 is processed by adopting a casting process, and the rib plates are arranged, so that materials are saved, the working strength is also met, the test bed mainly adopts cast iron, the structural rigidity is high, and the test bed is not easy to generate coupled vibration with a tested piece, so that the test error is reduced.
(7) The clamping of the clamp 4 adopts the hexagon socket nuts with uniform models, so that the tools can be conveniently stored and managed when the assembly is convenient.
(8) The hydraulic vibration exciter 7 is selected for use, the frequency range is wide, the output driving force is large, the adjustment and the control are easy, and the operation is convenient.
The principle and the embodiment of the invention are specifically explained by applying a typical bending-torsion fatigue test of a rectangular section beam, and are only used for helping the reader to understand the specific method and the core idea of the invention. Due to the limitation of the word expression, an infinite specific structure exists objectively, for the loading mode, on the premise of not departing from the principle of the invention, a plurality of improvements, decorations or changes can be made, and the improved decorations or changes can be directly applied to other occasions and are considered to be the protection scope of the invention.
Claims (4)
1. A loading device for a bending-torsion vibration fatigue test comprises a base (1), a clamp (4), a loading arm (5), a sliding seat (9) and a vibration exciter (7), and is characterized in that the base (1) is provided with a sliding groove (11), two ends of the sliding groove are provided with brackets (2), and the sliding groove (11) is connected with the vibration exciter (7); the base body (42) of the clamp (4) is U-shaped, notches (44) are formed in two sides of the base body, the base body (42) is connected with the support (2) through bolts, the top of the base body (42) is connected with the pressing plate (41) through bolts, a cylindrical clamping rod (43) is arranged in each notch (44), and a screw hole (45) is formed in one side of the base body (42); the sliding seat (9) is L-shaped, one side of the sliding seat (9) is provided with a side plate (91) through a screw, the other side of the sliding seat (9) is opposite to the side plate (91) and is provided with a shaft hole, two ends of the lower surface of the sliding seat (9) are provided with ejector rods (93), and a first coupler (92) is arranged between the ejector rods (93); the upper end of the vibration exciter (7) is connected with a first coupling (92); a rotating shaft (62) is arranged on two sides of the sliding sleeve (6), a clamping roller (61) is arranged above the sliding sleeve, and the rotating shaft (62) is connected with shaft holes of the sliding seat (9) and the side plate (91); a guide rod (8) is sleeved in the sliding sleeve (6), and one end of the guide rod (8) is connected with the loading arm (5); a chuck (51) is connected above a clamping seat (52) of the loading arm (5) through a screw, the clamping seat (52) is opposite to the chuck (51) and is provided with a V-shaped groove, and a second coupling (53) is arranged below the clamping seat (52).
2. The loading device for bending vibration fatigue test according to claim 1, wherein the screw hole (45) on one side of the seat body (42) is connected with the three-jaw chuck (10) through a screw.
3. The loading device for bending vibration fatigue test according to claim 1, wherein the guide rod (8) is provided with a scale.
4. A loading method of the loading device for bending vibration fatigue test according to claim 1, characterized by comprising the following steps:
1) clamping the test piece (3) through a clamping head (51) and a clamping seat (52);
2) when torsion loading is carried out, the guide rod (8) is sleeved on the sliding sleeve (6), the sliding seat (9) is connected with the vibration exciter (7) through the first coupler (92), the clamping roller (61) is loosened, the guide rod (8) can freely slide along the sliding sleeve (6), the ejector rod (93) below the sliding seat (9) is loosened, the sliding sleeve (6) freely rotates in the sliding seat (9) through the rotating shaft (62), and torque adjustment is realized by changing the position of the sliding sleeve (6) on the guide rod (8) and changing the output load of the vibration exciter (7);
3) when bending and twisting coupling loading is carried out, the clamping roller (61) is screwed down, so that the guide rod (8) cannot move freely along the sliding sleeve (6), the ejector rod (93) below the sliding seat (9) is loosened, the sliding sleeve (6) freely rotates in the sliding seat (9) through the rotating shaft (62), and transverse bending and twisting combined loading is realized under the condition that the vibration exciter (7) vertically applies force; the clamping roller (61) is loosened, the ejector rod (93) below the sliding seat (9) is screwed down, so that the sliding sleeve (6) cannot freely rotate in the sliding seat (9) through the rotating shaft (62), and under the condition that the vibration exciter (7) vertically applies force, longitudinal bending and twisting combined loading is realized; the clamping roller (61) and the ejector rod (93) below the sliding seat (9) are screwed down, so that the guide rod (8) cannot freely move along the sliding sleeve (6), the sliding sleeve (6) cannot freely rotate through the rotating shaft (62), and under the condition that the vibration exciter (7) vertically applies force, oblique bending and twisting combined loading is realized;
4) when pure bending loading is carried out, the guide rod (8) is detached, the vibration exciter (7) is moved to the lower part of the loading arm (5) through the sliding groove (11), the vibration exciter (7) is connected with the second coupling (53), and pure bending loading is realized under the condition that the vibration exciter (7) applies force vertically;
5) when the shaft test piece is tested, the three-jaw chuck (10) is arranged on the inner sides of the clamps (4) above the supports (2) at the two ends of the base (1), and the two ends of the shaft test piece are clamped through the three-jaw chuck (10), so that the test and installation of the test piece (3) are realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810465097.1A CN108709793B (en) | 2018-05-16 | 2018-05-16 | Loading device and method for bending-torsion vibration fatigue test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810465097.1A CN108709793B (en) | 2018-05-16 | 2018-05-16 | Loading device and method for bending-torsion vibration fatigue test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108709793A CN108709793A (en) | 2018-10-26 |
| CN108709793B true CN108709793B (en) | 2022-02-18 |
Family
ID=63868017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810465097.1A Active CN108709793B (en) | 2018-05-16 | 2018-05-16 | Loading device and method for bending-torsion vibration fatigue test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108709793B (en) |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109142090B (en) * | 2018-08-15 | 2023-06-23 | 天津大学 | Multi-shaft loading fatigue test device for tension, compression, bending and torsion |
| CN109341992A (en) * | 2018-11-01 | 2019-02-15 | 广州大学 | A kind of experimental provision for vibration mechanics modal test |
| CN109855955B (en) * | 2018-12-21 | 2021-05-11 | 浙江零跑科技有限公司 | Automobile body-in-white torsion test fixture and use method thereof |
| CN109946335B (en) * | 2019-03-07 | 2022-04-05 | 成都虹波实业股份有限公司 | Device and method for measuring molybdenum wire recrystallization temperature |
| CN109990963B (en) * | 2019-03-15 | 2021-09-28 | 广州大学 | Self-vibration characteristic test platform of structural member |
| CN110132555B (en) * | 2019-04-22 | 2020-03-03 | 燕山大学 | Assembly structure, testing machine and method for bending load and torsion load tests |
| CN110712763A (en) * | 2019-10-12 | 2020-01-21 | 哈尔滨飞机工业集团有限责任公司 | Single-spar crack propagation test device and test method |
| CN110595913B (en) * | 2019-10-14 | 2024-09-17 | 桂林电子科技大学 | Device and method for measuring bending vibration stress of welding spot of circuit board |
| CN110579410B (en) * | 2019-10-16 | 2020-07-31 | 西安交通大学 | General experimental device for bending fatigue performance |
| CN112903475A (en) * | 2019-11-19 | 2021-06-04 | 中国商用飞机有限责任公司 | Device and method for testing bending and twisting strength of I-shaped stringer test piece |
| CN110822011A (en) * | 2019-12-23 | 2020-02-21 | 哈尔滨工程大学 | Vibration isolation beam system based on modal localization theory |
| CN111175159B (en) * | 2019-12-30 | 2023-08-25 | 中钢集团邢台机械轧辊有限公司 | Horizontal bat type contact fatigue testing machine |
| CN111103109A (en) * | 2020-02-13 | 2020-05-05 | 中国工程物理研究院总体工程研究所 | Broadband torsional vibration test system |
| CN111678802A (en) * | 2020-06-28 | 2020-09-18 | 烟台大学 | Double-arm bending and twisting combined experimental method and device |
| CN112082745B (en) * | 2020-08-28 | 2022-07-22 | 西南石油大学 | Multi-axis variable frequency fatigue test device suitable for manifold type pipe fitting |
| CN112666024B (en) * | 2020-12-18 | 2024-08-09 | 南昌航空大学 | Clamp bending test device based on vibration physical field |
| CN112710563A (en) * | 2020-12-21 | 2021-04-27 | 中南大学 | Metal bar bending fatigue test method |
| CN112880992B (en) * | 2021-01-15 | 2022-06-07 | 一汽解放汽车有限公司 | System and method for crankshaft bending and twisting fatigue test |
| CN113125332B (en) * | 2021-03-22 | 2022-02-18 | 同济大学 | Automatic rotating fatigue loading device for salt spray test |
| CN113884399A (en) * | 2021-09-28 | 2022-01-04 | 兰州理工大学 | Metal material fatigue resistance detection device |
| CN114235362B (en) * | 2021-12-02 | 2024-04-26 | 三一重能股份有限公司 | Test system for wind power blade component |
| CN114518210B (en) * | 2022-01-07 | 2024-08-20 | 西北工业大学太仓长三角研究院 | Bending stiffness testing device for space bistable thin-wall stretching rod |
| CN114394258B (en) * | 2022-01-18 | 2024-07-30 | 湖南航天环宇通信科技股份有限公司 | Mechanical property experimental device and method for aileron driving mechanism |
| CN114608979A (en) * | 2022-03-22 | 2022-06-10 | 西南交通大学 | Bending-torsion composite high-temperature fretting fatigue test device |
| CN114923796B (en) * | 2022-05-18 | 2024-08-30 | 福州大学 | Welded drill rod joint bending and torsion fatigue testing machine and working method thereof |
| CN116660055B (en) * | 2023-06-02 | 2023-11-03 | 南京航空航天大学 | Four-point bending loading test device suitable for main cargo compartment door lock hook structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201464278U (en) * | 2009-08-31 | 2010-05-12 | 龚健 | Multi-function laboratory table for material mechanics |
| CN103048207A (en) * | 2012-12-13 | 2013-04-17 | 广西大学 | Combined torsional experiment device |
| CN103389243A (en) * | 2013-07-31 | 2013-11-13 | 吉林大学 | Micro material mechanical performance testing platform under stretching-bending-twisting multi-loads |
| CN203606232U (en) * | 2013-12-09 | 2014-05-21 | 华东交通大学 | Pressing, bending and twisting composite stress member loading device |
| CN208155713U (en) * | 2018-05-16 | 2018-11-27 | 南昌航空大学 | Loading device for Bending-Twist Vibrations fatigue test |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512803B (en) * | 2013-09-26 | 2016-08-17 | 吉林大学 | Multi-load multiple physical field coupling material Micro Mechanical Properties in-situ test instrument |
-
2018
- 2018-05-16 CN CN201810465097.1A patent/CN108709793B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201464278U (en) * | 2009-08-31 | 2010-05-12 | 龚健 | Multi-function laboratory table for material mechanics |
| CN103048207A (en) * | 2012-12-13 | 2013-04-17 | 广西大学 | Combined torsional experiment device |
| CN103389243A (en) * | 2013-07-31 | 2013-11-13 | 吉林大学 | Micro material mechanical performance testing platform under stretching-bending-twisting multi-loads |
| CN203606232U (en) * | 2013-12-09 | 2014-05-21 | 华东交通大学 | Pressing, bending and twisting composite stress member loading device |
| CN208155713U (en) * | 2018-05-16 | 2018-11-27 | 南昌航空大学 | Loading device for Bending-Twist Vibrations fatigue test |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108709793A (en) | 2018-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108709793B (en) | Loading device and method for bending-torsion vibration fatigue test | |
| CN208155713U (en) | Loading device for Bending-Twist Vibrations fatigue test | |
| CN106680079B (en) | Piezoelectric stack direct-driven macro-micro combined biaxial stretching-fatigue testing system | |
| CN109163904B (en) | Fatigue limit testing machine for multi-load motion knuckle bearing | |
| JP2007510151A6 (en) | Multi-axis universal testing machine | |
| US10620069B2 (en) | Multi-bolt loosening test machine for flange with tension and bending compound loading | |
| CN107179183B (en) | Flexural pivot three-dimensional loading fatigue test device | |
| WO2020047734A1 (en) | Device and method for testing mechanical properties of fiber reinforced composite material during degradation | |
| CN110132739B (en) | Micro fatigue test normal load loading device and method | |
| WO2015135329A1 (en) | Fatigue testing device for pulsation fatigue testing machine and pulsation fatigue testing machine | |
| CN109781398B (en) | Screw connection anti-loosening test measurement device and method | |
| CN111795773B (en) | Large-torque sensor calibration device and calibration method | |
| CN209878482U (en) | Device for testing fatigue mechanical properties of material under tensile-bending composite load | |
| KR101179229B1 (en) | Tension and Torque Simultaneous Loading Test Bench | |
| CN102419244B (en) | Comprehensive vibration test table | |
| CN212482784U (en) | Large-torque sensor calibration device | |
| CN110044743A (en) | Nickel-based monocrystal small sample fatigue test system and method | |
| CN110842603B (en) | Connecting rod components of a whole that can function independently processing frock | |
| CN205374031U (en) | A axial tension or pressure driven ware for fatigue test | |
| CN107192612B (en) | A kind of tension-torsion fatigue test board | |
| CN205940960U (en) | Automobile semi -axle and transmission shaft twist reverse fatigue test device | |
| CN112179759A (en) | Sandwich structure material compression shear test fixture | |
| JP5388185B2 (en) | Vibration isolator test equipment | |
| CN116625848A (en) | Composite loading device | |
| JP7363969B2 (en) | Compression test jig, material testing machine, and parallelism adjustment method in material testing machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |