Pulling / pressing-twisting synchronous loading device

Abstract

The utility model discloses a pulling / pressing-twisting synchronous loading device. The pulling / pressing-twisting synchronous loading device comprises two pulling / pressing-twisting components. Wherein the pulling / pressing-twisting component is composed of a spiral column, and the cross section of the spiral column is in a fan shape; the lead angle of the pulling / pressing-twisting component is larger than the self-locking angle and smaller than 70 degrees, and different lead angles correspond to different pulling / pressing-twisting load ratios. In the using process of the device, the two pulling / pressing-twisting components need to be screwed together and then placed between an incident rod and a sample. The incident bar, the pull / press-torsion synchronous loading device, the sample and the transmission bar need to be firmly connected. The tension / pressure-torsion synchronous loading device provided by the utility model is simple in structure, can realize the mechanical property test of the material under the tension / pressure and torsion combined load only by refitting the existing experimental device, and has remarkable economic benefits and social benefits.

Description

TECHNICAL FIELD

[0001] The utility model relates to material mechanics performance test field, concretely relates to a realization pull / pressure - torsion synchronous loading device. BACKGROUND

[0002] Materials are often in complex stress state in application, and its deformation and failure mode all show obvious different behavior characteristics from uniaxial loading; Therefore, it is very necessary to obtain the mechanical response of materials under combined load through experiment; At present, the quasi-static composite loading experiment technology has been very good, but the dynamic composite loading experiment technology still has many challenges; Hopkinson bar is often used to measure material dynamic mechanical properties because of its ingenious design and simple test method; Therefore, the current dynamic composite loading research results are mostly based on Hopkinson bar, but the implementation modes are different.

[0003] Some researchers realize compression-shear composite loading by changing the sample structure; However, the above method realizes compression-shear composite loading, but the test of experimental parameters is limited; In addition, someone proposes to increase a crystal gasket at the front end of the sample, and then use the anisotropic characteristics of the crystal to convert uniaxial load into compression-shear composite load; However, for a given crystal and orientation, the compression-shear ratio is fixed, so different crystal materials and orientations need to be used to adjust the compression-shear ratio; In summary, although the existing Hopkinson compression bar is used to modify the sample to realize compression-shear composite loading, there are still limitations for material constitutive parameter test, that is, it is difficult to meet the requirements by only improving the sample to realize compression-shear composite loading.

[0004] Some researchers change the end face of the incident bar in contact with the sample, and also decompose the compression wave into compression wave and shear wave at the interface between the incident bar and the sample; Due to the transverse shear effect, bending wave will be generated in the bar, and the friction coefficient between the bar and the sample should be large enough to prevent slip during loading.

[0005] Some researchers propose to install a torsion driving device on the Hopkinson bar; Because the control accuracy of stress wave generation time by traditional launching method is in millisecond level, and the longitudinal wave speed is faster than the shear wave, the sample generally experiences compression loading first, and then compression-shear composite loading, which is difficult to realize synchronous loading; Therefore, the most important challenge of dynamic composite loading by traditional Hopkinson bar is the synchronization of loading.

[0006] Some researchers directly input stress waves in the incident rod by electromagnetic method, and claim that the main advantage of the technology is that the time of stress wave generation can be accurately controlled; then they propose an electromagnetic clamping device for dynamic torsion, which releases the torsional energy stored in the incident rod by using Lorentz force to form torsional waves; therefore, the time of stress wave generation is accurately controlled according to the time difference caused by the wave velocity difference, and the tensile-compressive stress wave and the torsional stress wave reach the sample at the same time, thereby solving the synchronization problem of dynamic combined loading, but the device is relatively complex and expensive, and is difficult to be widely applied. SUMMARY

[0007] The present application aims to overcome the shortcomings of the prior art, and provides a tensile-compressive-torsional synchronous loading device.

[0008] The technical solution of the present application to solve the above technical problem is: the tensile-compressive-torsional synchronous loading device comprises two tensile-compressive-torsional components; wherein the tensile-compressive-torsional component is composed of a spiral column, and the cross section of the spiral column is in the shape of a fan; the helix angle of the tensile-compressive-torsional component is greater than the self-locking angle and less than 70°, and different helix angles correspond to different tensile-compressive-torsional load ratios; the tensile-compressive-torsional components need to be screwed together, and the cross section of the screwed part is in the shape of a ring; the compressive-torsional synchronous loading device needs to be placed between the incident rod and the sample; the incident rod, the tensile-compressive-torsional synchronous loading device, the sample and the transmission rod need to be firmly connected, so as to ensure that the tensile-compressive-torsional synchronous loading device decomposes the tensile-compressive force into tensile-compressive force and torsional moment, and then the sample can be simultaneously subjected to combined loading of tension and compression and torsion.

[0009] In one preferred embodiment of the present application, the number of spiral columns in the tensile-compressive-torsional component can be set to 2, 3, 4, 5 or 6.

[0010] In one preferred embodiment of the present application, the material of the tensile-compressive-torsional component is a metal with high yield strength, such as titanium alloy, high manganese steel, stainless steel and high-strength aluminum alloy.

[0011] In one preferred embodiment of the present application, the part of the tensile-compressive-torsional component that is not screwed together is provided with a buffer layer, such as rubber, polyurethane, etc.

[0012] One preferred embodiment of the utility model, its characterized in be that the helical pitch angle of the tension / compression-rotation torsion component is 20°, 25°, 30°, 35°, 40° and 45°, and the corresponding tension / compression-torsion load ratio is 1.66, 1.4, 1.2, 1.15, 1.1 and 0.95.

[0013] One preferred embodiment of the utility model, its characterized in that the connection between the incident rod, the tension / compression-torsion synchronous loading device, the sample and the transmission rod can be pasted with epoxy resin, or can be connected by mechanical assembly.

[0014] One preferred embodiment of the utility model, its characterized in that the contact surface of the two tension / compression-rotation torsion components should be as smooth as possible, and lubricating material such as lubricating oil and graphite should be applied on the contact surface during the experiment.

[0015] One preferred embodiment of the utility model, its characterized in that the tension / compression-torsion synchronous loading device can also be applied to quasi-static tension / compression experiment, light gas gun experiment and drop hammer experiment.

[0016] One preferred embodiment of the utility model, its characterized in that the use method of the tension / compression-torsion synchronous loading device comprises the following steps:

[0017] (1) the tension / compression-rotation torsion component is connected with the incident rod and firmly connected;

[0018] (2) the other tension / compression-rotation torsion component is connected with one end surface of the sample and firmly connected;

[0019] (3) the assembled tension / compression-rotation torsion component and the other tension / compression-rotation torsion component connected with the sample are assembled;

[0020] (4) the positions of the incident rod, the tension / compression-torsion synchronous loading device, the sample and the transmission rod are adjusted to meet the experimental requirements;

[0021] (5) the other end surface of the sample is connected with the transmission rod and firmly connected;

[0022] (6) the strain dynamic acquisition instrument is confirmed to be in normal state;

[0023] (7) the firing air pressure is set and the bullet is fired;

[0024] (8) the signals of the strain gauges on the incident rod and the transmission rod are collected;

[0025] (9) the signal curve is processed by computer.

[0026] The working principle of the realization of the tensile / compressive-torsion synchronous loading device is that: the relative movement of the two tensile / compressive-torsion components in the tensile / compressive-torsion synchronous loading device produces torsion, the tensile / compressive force transmitted by the pressure head or the clamp is simultaneously converted into tensile / compressive force and torsional moment, and the converted tensile / compressive force and torsional moment simultaneously act on the sample, so that the tensile / compressive-torsion synchronous loading of the sample is realized.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] 1、The realization of the tensile / compressive-torsion synchronous loading device can simultaneously decompose the tensile / compressive force into tensile / compressive force and torsional moment, so that the tensile / compressive-torsion composite loading of the sample is realized.

[0029] 2、The realization of the tensile / compressive-torsion synchronous loading device can manufacture devices with different helix angles according to experimental needs, so as to change the ratio of tensile / compressive load and torsional load.

[0030] 3、The realization of the tensile / compressive-torsion synchronous loading device can be modified on the existing experimental device to realize the tensile / compressive-torsion composite loading of the sample, and has remarkable economic benefit and social benefit. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The utility model is used for realizing dynamic compression-torsion synchronous loading device specific embodiment schematic view.

[0032] Figure 2 The utility model is used for realizing dynamic tensile-torsion synchronous loading device specific embodiment schematic view. DETAILED DESCRIPTION

[0033] The utility model will be further described in detail in combination with examples and drawings, but the embodiment of the utility model is not limited thereto.

[0034] Example 1:

[0035] Referring to Figure 1The utility model discloses a kind of compression-torsion synchronous loading devices 4 including two compression-rotary torsion components 9. Among them, the compression-rotary torsion component 9 is made of spiral column 8, the spiral column 8 cross section is scallop shape;The helix angle of the compression-rotary torsion component 9 is greater than self-locking angle and less than 70 °, different helix angle corresponds to different compression-torsion load ratio;The compression-rotary torsion component 9 needs to be mutually screwed together, and the cross section of mutual screwing portion is circular ring shape;The compression-torsion synchronous loading device 4 needs to be placed between incident rod 2 and sample 5;Incident rod 2, compression-torsion synchronous loading device 4, sample 5 and transmission rod 7 need to be connected firmly, to ensure that compression-torsion synchronous loading device 4 decomposes compression stress into compression stress and torsional shear stress, and then makes sample 5 can be simultaneously subjected to compression and torsion combined loading.

[0036] The number of spiral column 8 in the compression-rotary torsion component 9 is set to 3.

[0037] The material of the compression-torsion component 9 is titanium alloy.

[0038] The buffer layer 10 set in the non-mutual screwing portion of the compression-rotary torsion component 9 is rubber.

[0039] The helix angle of the compression-rotary torsion component 9 is 25 °, and the corresponding compression-torsion load ratio is 1.4.

[0040] The connection between incident rod 2, compression-torsion synchronous loading device 4, sample 5 and transmission rod 7 can adopt epoxy resin to be pasted.

[0041] The contact surface of the two compression-rotary torsion components 9 should be as smooth as possible, and lubricating oil needs to be smeared on the contact surface during experiment.

[0042] The compression-torsion synchronous loading device 4 can also be applied to quasi-static compression experiment, light gas gun experiment and drop hammer experiment.

[0043] Referring to Figure 1 The use method of the compression-torsion synchronous loading device of the embodiment includes the following steps:

[0044] (1) The compression-rotary torsion component 9 is connected with incident rod 2 and connected firmly;

[0045] (2) The other compression-rotary torsion component 9 is connected with one end surface of sample 5 and connected firmly;

[0046] (3) The compression-rotary torsion component assembled is screwed and assembled with the other compression-rotary torsion component connected with sample 5;

[0047] (4) Adjust the position of the incident rod 2, compression-torsion synchronous loading device 4, sample 5 and transmission rod 7 to meet the experimental requirements;

[0048] (5) Connect the other end surface of the sample 5 with the transmission rod 7 and make the connection firm;

[0049] (6) Confirm that the strain dynamic acquisition instrument is in normal state;

[0050] (7) Set the emission air pressure and emit the bullet 1;

[0051] (8) Collect the signals of the strain gauges 3 and 6 on the incident rod 2 and transmission rod 7;

[0052] (9) Process the signal curve through the computer.

[0053] Example 2:

[0054] Referring to Figure 2 , the stretch-torsion synchronous loading device 4 comprises two stretch-torsion members 9. The stretch-torsion member 9 is composed of a spiral column 8, and the cross section of the spiral column 8 is in the shape of a sector. The helix angle of the stretch-torsion member 9 is greater than the self-locking angle and less than 70°, and different helix angles correspond to different stretch-torsion load ratios. The stretch-torsion members 9 need to be screwed together, and the cross section of the mutual screwing part is in the shape of a ring. The stretch-torsion synchronous loading device 4 needs to be placed between the incident rod 2 and the sample 5. The incident rod 2, stretch-torsion synchronous loading device 4, sample 5 and transmission rod 7 need to be connected firmly, so as to ensure that the stretch-torsion synchronous loading device 4 decomposes the tensile stress into tensile stress and torsional shear stress, and further enables the sample 5 to be subjected to combined loading of stretching and torsion.

[0055] The number of the spiral columns 8 in the stretch-torsion member 9 is set to three.

[0056] The material of the stretch-torsion member 9 is high-strength steel.

[0057] The helix angle of the stretch-torsion member 9 is 30°, and the corresponding stretch-torsion load ratio is 1.2.

[0058] The connection between the incident rod 2, stretch-torsion synchronous loading device 4, sample 5 and transmission rod 7 can be achieved by mechanical assembly.

[0059] The contact surface of the two stretch-torsion members 9 should be as smooth as possible, and lubricating oil needs to be applied to the contact surface during the experiment.

[0060] The stretch-torsion synchronous loading device 4 can also be applied to quasi-static tensile experiments.

[0061] Referring to Figure 2 The method for using the stretch-torsion synchronous loading device comprises the following steps:

[0062] (1) The stretch-torsion member 9 is connected to the incident rod 2 and is firmly connected;

[0063] (2) The other stretch-torsion member 9 is connected to one end surface of the sample 5 and is firmly connected;

[0064] (3) The assembled stretch-torsion member is screw-coupled with the other stretch-torsion member connected to the sample 5;

[0065] (4) The positions of the incident rod 2, the stretch-torsion synchronous loading device 4, the sample 5 and the transmission rod 7 are adjusted so that the positions meet the experimental requirements;

[0066] (5) The other end surface of the sample 5 is connected to the transmission rod 7 and is firmly connected;

[0067] (6) It is confirmed that the strain dynamic acquisition instrument is in a normal state;

[0068] (7) The emission air pressure is set and the annular bullet 1 is emitted;

[0069] (8) The signals of the strain gauges 3 and 6 on the incident rod 2 and the transmission rod 7 are collected;

[0070] (9) The signal curve is processed through the computer.

[0071] Referring to Figure 1 and Figure 2 The working principle of the stretch / compression-torsion synchronous loading device will be further described in combination with the drawings:

[0072] The relative movement of the two stretch / compression-torsion members 9 in the stretch / compression-torsion synchronous loading device 4 generates torsion, simultaneously converts the tensile / compressive stress transmitted by the incident rod 2 into tensile / compressive stress and torsional shear stress, and simultaneously acts the converted tensile / compressive stress and torsional shear stress on the sample 5, so that the sample 5 is subjected to stretch / compression-torsion synchronous loading.

[0073] The above is the preferred embodiment of the present application, but the embodiment of the present application is not limited by the above content, any change, modification, replacement, combination, simplification made without departing from the spirit and principle of the present application shall be an equivalent replacement mode, which is all included in the protection scope of the present application.

Claims

1. A device for implementing tension / compression-torsion synchronous loading, characterized in that, The device comprises two tension / compression-rotation torsion members; wherein the tension / compression-rotation torsion members are composed of spiral columns, the cross section of the spiral columns is in the shape of a sector; the spiral angle of the tension / compression-rotation torsion members is greater than the self-locking angle and less than 70°, different spiral angles correspond to different tension / compression-torsion load ratios; the tension / compression-rotation torsion members need to be screwed together, the cross section of the mutual screwing part is in the shape of a ring; the tension / compression-torsion synchronous loading device needs to be placed between the incident rod and the sample; the incident rod, the tension / compression-torsion synchronous loading device, the sample and the transmission rod need to be connected firmly.

2. The apparatus according to claim 1, wherein, The number of the spiral columns in the tension / compression-rotation torsion members can be set to 2, 3, 4, 5 or 6.

3. The apparatus according to claim 1, wherein, The material of the tension / compression-rotation torsion members is a metal with high yield strength.

4. The apparatus according to claim 1, wherein, The part of the tension / compression-rotation torsion members that is not screwed together is provided with a buffer layer.

5. The apparatus according to claim 1, wherein, When the spiral angle of the tension / compression-rotation torsion members is 20°, 25°, 30°, 35°, 40° or 45°, the corresponding tension / compression-torsion load ratio is 1.66, 1.4, 1.2, 1.15, 1.1 or 0.

95.

6. The apparatus according to claim 1, wherein The connection between the incident rod, the tension / compression-torsion synchronous loading device, the sample and the transmission rod can be performed by pasting with epoxy resin or by mechanical assembly.

7. The apparatus according to claim 1, wherein, The contact surface of the two tension / compression-rotation torsion members that are screwed together should be as smooth as possible, and lubricating material needs to be applied on the contact surface during the experiment.

8. The apparatus according to claim 1, wherein, The tension / compression-torsion synchronous loading device can also be applied to quasi-static tension / compression experiments, light gas gun experiments and drop hammer experiments.

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