CN110514381B - Simply supported boundary condition restraint device for fixing one end of self-weight drop hammer testing machine - Google Patents
Simply supported boundary condition restraint device for fixing one end of self-weight drop hammer testing machine Download PDFInfo
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- CN110514381B CN110514381B CN201910762942.6A CN201910762942A CN110514381B CN 110514381 B CN110514381 B CN 110514381B CN 201910762942 A CN201910762942 A CN 201910762942A CN 110514381 B CN110514381 B CN 110514381B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a restraint device for realizing the condition of a boundary of one fixed end and one simply supported end of a self-weight drop hammer testing machine, which comprises a fixed end pressing beam component 1, a long screw rod 2 for the fixed end pressing beam, a hinged end base component 3, a hinged end clamping plate bottom plate component 4I, a hinged end clamping plate top plate 4 II, a bearing 5, a screw rod 6 for the clamping plate, a rotating shaft 7, a hinged end base anchoring screw rod 8, a hexagon bolt 9, a nut 10 and a test piece 11. The fixed boundary condition is that the fixed end presses the beam component, the test piece is clamped and fixed through the two fixed end pressing beam components, thereby realizing the fixed end constraint; the simple supporting boundary condition forms a complete hinged supporting constraint system through the hinged supporting end base, the hinged supporting end clamping plate bottom plate, the hinged supporting end clamping plate top plate, the rotating shaft, the bearing and the shaft cap, so that the simple supporting boundary condition is better realized in the impact process. The device is suitable for components of different sizes, realizes the fixation of any height through the bolt and the screw rod, has a larger width range, and can be suitable for most of test components.
Description
Technical Field
The invention belongs to the field of component disaster simulation devices, and particularly relates to a constraint device for realizing a boundary condition that one end of a self-weight drop hammer testing machine is fixed and one end of the self-weight drop hammer testing machine is simply supported, which is applied to the self-weight drop hammer testing machine.
Background
In recent years, accidents such as traffic accidents and terrorist attacks occur frequently, and the accidents can usually generate huge impact load on the local part of the structure in a short time, the maximum pressure generated by the impact load on the structure may far exceed the bearing capacity of the conventional design, and the destructive characteristic and the stress performance of the structure or the component at the moment are usually different from those under the action of the conventional load, which is undoubtedly a great test on the structure itself. In the operation process of a crane of an industrial factory building, the problem that a heavy object of the crane collides with a factory building column is inevitable, and a boundary condition that one end of the crane is fixed and the other end of the crane is simply supported is frequently generated in the industrial bent frame factory building, so that the research on the impact resistance of a member under the condition of the fixed boundary and the simple boundary has very important significance.
In a traditional device for a solid end boundary condition of a drop hammer impact testing machine, a die with a fixed size is adopted to perfectly fit with a test piece, although the boundary condition is properly controlled, the conditions of complicated mounting and dismounting operation, material waste and the like are difficult to avoid when test pieces with different sizes are used in a test; in the simple support end, a cutter hinge is often used, the structure of the cutter hinge is excellent in static force loading test and is simple to operate, but in an impact test, due to the fact that the upper part of a test piece is lack of constraint, at the moment that impact load impacts the test piece, the situation of less constraint caused by jumping, tilting and separation of the test piece is easy to occur, or the situation of over constraint caused by improper constraint is easy to occur.
The deadweight drop hammer impact test is widely used due to its simple operation and good simulation effect. However, in the conventional drop hammer impact test, the test piece is usually tilted and separated from the support at the moment of impact of the drop hammer, so that the simple support condition in the impact test process is difficult to realize. Therefore, the device is improved, and the device aims to accurately assist the dead weight type drop hammer testing machine to simulate the stress state of a component under impact load.
Disclosure of Invention
In order to better realize the boundary condition of a test piece in a drop hammer impact test, the invention aims to provide a restraint device for realizing the boundary condition that one end of a self-weight drop hammer testing machine is fixed and one end of the self-weight drop hammer testing machine is simply supported, a test piece is fixed through an upper clamping plate and a pressing beam, the drop hammer impact test is carried out after the installation is finished, meanwhile, in order to adapt to test pieces with different sizes, long plate type contact is adopted, no limitation is arranged on the width direction of the test piece, and the utilization rate of the device is improved; then, the simple supporting end can rotate in a vertical plane which is upward in the length direction of the test piece due to the existence of the rotating shaft, the fixed end is fixed by using the pressing beam, and the lower part of the pressing beam cannot rotate and is in contact with the test piece in a rectangular plane, so that the rotation of the pressing beam is limited, and the fixed end constraint condition is obtained, so that the purpose of fixing and simply constraining is achieved.
The invention is realized by adopting the following technical scheme:
the utility model provides a realize that dead weight drop hammer testing machine one end is fixed simple boundary condition restraint device of one end, presses the roof beam component including solid end, and solid end presses the long screw rod for the roof beam, hinge support end base component, hinge support end splint bottom plate component, hinge support end splint roof plate, bearing, the screw rod for the splint, axis of rotation, hinge support end base anchor screw rod, hexagon bolt, nut, test piece.
The fixed end beam pressing component comprises a beam body, flange bases are symmetrically arranged at four corners of two sides of the beam body, and reserved through holes are formed in the flange bases.
The two fixed end pressing beam components are arranged in an up-down corresponding mode, one end of the test piece is located between the two fixed end pressing beam components, four corners of the two fixed end pressing beam components are fixedly connected through hexagon bolts after penetrating through the long screw for the fixed end pressing beam components through reserved through holes of the four fixed end pressing beam components, and the lower end of the long screw for the fixed end pressing beam components is anchored to a reserved anchoring hole in the ground through the hexagon bolts.
The hinged end base component comprises a bottom plate, reserved through holes are symmetrically formed in two sides of the bottom plate, and the bottom plate penetrates through the anchoring screw rod of the hinged end base through the reserved through holes and then is anchored to the reserved anchoring hole in the ground by adopting a hexagon bolt; the bottom plate is provided with a hinged end base, the lug seats on two sides of the hinged end base are symmetrically provided with step holes I, and each step hole I is composed of a bearing hole and a connecting hole.
The hinged end clamping plate bottom plate component comprises a base plate, reserved through holes are formed in two sides of the base plate, lug plates are symmetrically arranged on two sides of the bottom surface of the base plate, step holes II are symmetrically formed in the two lug plates, and each step hole II is composed of a bearing hole and a connecting hole.
The hinged end base component and the hinged end clamping plate bottom plate component are connected through the rotating shaft, namely the rotating shaft penetrates through a connecting hole of the step hole I and a connecting hole of the step hole II, and the bearing is positioned in a bearing hole of the step hole I and a bearing hole of the step hole II; and nuts are arranged at two ends of the rotating shaft.
And reserved through holes are symmetrically formed in two sides of the top plate of the hinged end clamping plate.
The other end of the test piece is positioned between the hinged end clamping plate bottom plate component and the hinged end clamping plate top plate, and the hinged end clamping plate bottom plate component and the hinged end clamping plate top plate are fixedly connected through hexagon bolts after penetrating through the clamping plate screw rods through respective reserved through holes.
Each reserved through hole is provided with a reserved hexagon bolt.
When the device is used, one end of a test piece is clamped and fixed by the fixed end pressing beam component, the two fixed end pressing beam components and the ground are connected from top to bottom through the four long screws and the twelve hexagon bolts, and finally the device is anchored on the ground to be firm and provide support counter force, so that fixed end constraint is realized. The hinged end base is anchored to the ground through two hexagon bolts and a screw, the upper portion of the hinged end base is provided with a connecting hole and is connected with a hinged end clamping plate bottom plate component through a rotating shaft, and a bearing is arranged in the middle of the hinged end base to reduce rotating resistance. The shaft caps are disposed at both ends of the rotating shaft. The other end of the test piece is horizontally arranged on the clamping plate bottom plate, the clamping plate top plate is arranged on the upper portion of the test piece, and the clamping plate top plate and the clamping plate bottom plate are connected through two long screw rods and four hexagonal bolts to form a whole.
During concrete installation, install the solid end of lower part earlier and press the roof beam, the anchor hole that its bolt hole was reserved to ground, the simple end is with base anchor to ground, secondly the axis of rotation of installation simple end, the bearing is arranged in the outside reservation bearing notch on the simple end base upper portion in, pass splint bottom plate connecting hole department with the axis of rotation again, the laminating of reservation bearing notch of bearing and splint bottom plate and rotation axis connection department simultaneously, then install the nut in the axis of rotation both ends protection axis of rotation can not cause because of the removal appears in the use and deviate from, place the test piece in the solid end of lower part and press the roof beam at last, on the simple end bottom plate, settle upper portion solid end pressure roof beam and splint roof in test piece upper portion, use screw rod and hex bolts to connect the anchor, accomplish boundary condition's installation.
The invention has the following characteristics:
1. connect pressure roof beam or splint through the screw, press from both sides tight test piece, aim at prevents that the test piece perk, breaks away from the support, forms a whole simultaneously.
2. The anchoring holes of the two fixed-end pressing beams and the anchoring holes reserved on the ground are located in the same straight line, and the purpose is that the device is convenient to install and is more stable due to the fact that the anchoring force is enhanced.
3. The simple-supported end base is anchored to the ground through a screw and a hexagon bolt, and the aim is to connect the ground and the base into a rigid whole.
4. The simple-supported end clamping plate bottom plate is connected with the base through the rotating shaft and the bearing, and the purpose is to reduce rotating resistance through the bearing and realize unidirectional rotation in the form of the rotating shaft.
5. The simple-supported end clamping plate bottom plate and the top plate are integrally formed after the test piece is clamped through screw anchoring, the test piece rotates in one direction with the help of the rotating shaft as a whole, and meanwhile, the test piece is prevented from being tilted and separated, so that test data are more accurate.
6. The test piece is arranged at the fixed end and the simple supporting end, then the screw rod and the bolt are used for anchoring, a fixed simple boundary condition is provided, and then the drop hammer impact test is carried out.
Drawings
Fig. 1 shows a schematic view of a fixed end compression beam member.
Fig. 2 is a schematic view of a long screw member for fixing end pressure beams.
Figure 3 shows a schematic view of a hinged end base member.
Figure 4a shows a schematic view of a hinged end cleat base plate member.
Figure 4b shows a schematic view of the hinged end clamp plate bottom plate top plate.
Fig. 5 shows a schematic view of a bearing.
Fig. 6 is a schematic view of a screw for clamping the plate.
Fig. 7 shows a schematic view of the rotating shaft.
Figure 8 shows a schematic view of the anchor screw of the hinged end base.
Fig. 9 shows a schematic view of a universal hexagon bolt.
Figure 10 shows a schematic view of the screw cap.
Fig. 11 shows a schematic view of the fixed end assembly.
Figure 12a shows a schematic view of the hinged end base member installation process.
Figure 12b shows a schematic of the hinge-end installation process.
Figure 13a shows a schematic of the hinged end function (horizontal).
Figure 13b shows a schematic of the hinge end function (rotation).
Fig. 14 shows a schematic view of the overall structure.
In the figure: 1-fixed end pressing beam component, 2-long screw for fixed end pressing beam, 3-hinged end base component, 4I-hinged end clamping plate bottom plate component, 4 II-hinged end clamping plate top plate, 5-bearing, 6-screw for clamping plate, 7-rotating shaft, 8-hinged end base anchoring screw, 9-hexagon bolt, 10-nut and 11-test piece; a, reserving a through hole, B, reserving a hexagonal bolt groove, C, a step hole I, D, a step hole II, e, a bearing hole and f, connecting holes; 101-beam body, 102-flange seat; 301-bottom plate, 302-hinged end base, 303-ear seat; 401-substrate, 402-ear plate.
Detailed Description
Because the boundary condition that one end of the industrial bent frame factory building is fixed and one end of the industrial bent frame factory building is simply supported often occurs, and the problem that the factory building column is collided by the load of a crane in the corresponding crane operation process is inevitably needed, the invention aims to solve the problem that the boundary condition that one end of the industrial factory building column is fixed and one end of the industrial bent frame factory building column is collided by the external load.
The utility model provides a realize that dead weight drop hammer testing machine one end is fixed restraint device of simply supporting boundary condition of one end, presses roof beam component 1 including solid end, and solid end presses roof beam to use long screw 2, and hinge end base component 3, hinge end splint bottom plate component 4I, hinge end splint roof 4 II, bearing 5, for the splint screw rod 6, axis of rotation 7, hinge end base anchor screw 8, hexagon bolt 9, nut 10, test piece 11. As shown in fig. 14, the fixed boundary condition is that the fixed end presses the beam member, and the test piece is clamped and fixed by the two fixed end pressing beam members, so that the fixed end constraint is realized; the simple supporting boundary condition forms a complete hinged supporting constraint system through the hinged supporting end base, the hinged supporting end clamping plate bottom plate, the hinged supporting end clamping plate top plate, the rotating shaft, the bearing and the shaft cap, so that the simple supporting boundary condition is better realized in the impact process.
As shown in fig. 1, the fixed-end beam pressing member 1 includes a beam body 101, flange bases 102 are symmetrically arranged at four corners of two sides of the beam body 101, and a reserved through hole a is arranged on each flange base 102; each reserved through hole A is provided with a reserved hexagonal bolt groove B, namely, the flange parts on the two sides are provided with reserved conjunction holes (hexagonal bolt grooves B) for being in contact with hexagonal bolts, and the depth of the conjunction holes is set to be shallow, so that materials are saved, and the anchoring effect is enhanced.
As shown in fig. 11, two fixed-end pressure beam members 1 are arranged in an up-down corresponding manner, one end of a test piece 11 is located between the two fixed-end pressure beam members 1, four corners of the two fixed-end pressure beam members 1 are fixedly connected by a hexagon bolt 9 after penetrating through a long screw 2 for a fixed-end pressure beam through a reserved through hole, and the lower end of the long screw 2 for a fixed-end pressure beam is anchored to a reserved anchoring hole on the ground by the hexagon bolt 9. Specifically, for the installation of the fixed end support, firstly placing a fixed end pressing beam component, respectively arranging general hexagon bolts at four reserved hexagon bolt grooves, arranging a test piece on the top surface of a lower fixed end pressing beam, then arranging an upper fixed end pressing beam, wherein the contact surface is the bottom surface, arranging a long screw in a reserved through hole, anchoring by virtue of the hexagon bolts, arranging a thread section at the bottom of the long screw in a reserved anchoring hole on the ground, and anchoring the long screw to the ground by virtue of the hexagon bolts to complete the installation of the fixed end support. As shown in fig. 2, the upper, middle and lower three sections of the long screw are provided with threads, so that the smooth section can easily pass through the anchoring hole compared with the full-section threads, and after the threaded sections are matched, the anchoring effect is the same, and the installation time is reduced.
As shown in fig. 3, the hinged end base member 3 includes a bottom plate 301, two sides of the bottom plate 301 are symmetrically provided with reserved through holes a, and each reserved through hole a is provided with a reserved hexagonal bolt groove B. The bottom plate 301 is anchored to the reserved anchoring hole on the ground by the hexagon bolt 9 after penetrating through the reserved through hole and the anchor screw 8 of the hinged end base, which is shown in fig. 8. The bottom plate 301 is provided with a hinged end base 302, two side lug seats 303 on the hinged end base 302 are symmetrically provided with a step hole IC, the step hole IC is composed of a bearing hole e and a connecting hole f, the bearing hole e is positioned on the outer side of the step hole IC, and the aperture of the bearing hole e is larger than the connecting hole f.
As shown in fig. 4a, the hinged end clamping plate bottom plate member 4 i includes a base plate 401, two sides of the base plate 401 are provided with reserved through holes a, and each reserved through hole a is provided with a reserved hexagonal bolt groove B. The two sides of the bottom surface of the base plate 401 are symmetrically provided with the ear plates 402, the two ear plates 402 are symmetrically provided with step holes IID, each step hole IID is composed of a bearing hole e and a connecting hole f, the bearing hole e is located on the inner side of the step hole IID, and the aperture of the bearing hole e is larger than the connecting hole f.
As shown in fig. 12b, the rotation shaft 7 connects the hinged end base member 3 and the hinged end clamping plate bottom plate member 4 i, that is, the rotation shaft 7 (shown in fig. 7) passes through the connecting hole f of the stepped hole ic and the connecting hole f of the stepped hole id, the bearing 5 is located in the bearing hole e of the stepped hole ic and the bearing hole e of the stepped hole id, and the bearing is a multi-layer ball bearing, which has a relatively simple structure, low cost and good rotation effect. Nuts 10 are mounted on both ends of the rotary shaft 7 (the nuts are shown in fig. 10).
As shown in fig. 4B, two sides of the hinged end clamping plate top plate 4 ii are symmetrically provided with reserved through holes a, and a reserved hexagonal bolt groove B is formed in each reserved through hole a.
As shown in fig. 13a, the other end of the test piece 11 is located between the hinged end clamping plate bottom plate member 4 i and the hinged end clamping plate top plate 4 ii, two sides of the hinged end clamping plate bottom plate member 4 i and the hinged end clamping plate top plate 4 ii are respectively fixed and connected by a hexagon bolt 9 after passing through the clamping plate screw 6 through respective reserved through holes, and the clamping plate screw is as shown in fig. 6.
For the installation of the simply supported end support, firstly, two universal hexagon bolts are respectively arranged at the positions of the reserved hexagon bolt grooves on the two sides of the hinged end base component, then, the hinged end base anchoring screw penetrates through the reserved through hole, the base is anchored to the ground by virtue of the hexagon bolts, the installation of the simply supported end base is completed, the base and the ground are connected into a whole, and the foundation is enlarged. Then, the bearing is arranged at the reserved bearing holes at the two ends of the connecting plate at the upper part of the base (as shown in figure 12 a), then the connecting holes at the two sides of the bottom plate of the hinged end clamping plate and the bearing holes are aligned with the corresponding hole positions of the base, the rotating shaft penetrates through the reserved connecting holes of the two members, and the nuts are arranged at the two ends of the rotating shaft, so that the installation of the rotating system is completed. And finally, placing the test piece on a bottom plate of the hinged end clamping plate, placing a top plate of the hinged end clamping plate on the upper part of the test piece, placing a universal hexagon bolt in a reserved hexagon bolt groove, penetrating the clamping plate through the reserved screw holes of the two members by using a screw member, and anchoring tightly to enable the two clamping plates to clamp the test piece, thereby completing the installation of the simply supported end support.
For a simple end mount, the direction of rotation achievable is shown in fig. 13 b.
The constraint device for realizing the condition of the simply supported boundary at one fixed end of the self-weight drop hammer testing machine has the advantages that:
1. the device can be suitable for components with different sizes, can realize the fixation of any height through the bolt and the screw rod, has a larger width range, and can be suitable for most of test components.
2. The boundary constraint condition of the real component under the action of the impact load can be better simulated, and the error caused by the condition of less constraint or over constraint caused by the defect of a boundary condition device when the impact load acts on the test piece is reduced.
3. The device has simple structure, more parts are regular geometric bodies, and the manufacturing and processing cost is lower.
4. The use method is simple and easy to understand, the stress is reasonable and reliable, and the installation process is simple and convenient.
The embodiments of the present invention are described in detail above with reference to the drawings, but the present invention is not limited to the described embodiments. It will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the spirit and scope of the invention.
Claims (2)
1. The utility model provides a realize boundary condition restraint device that dead weight drop hammer testing machine one end is fixed one end simply supported which characterized in that: the device comprises a fixed end pressing beam component (1), a long screw (2) for the fixed end pressing beam, a hinged end base component (3), a hinged end clamping plate bottom plate component (4I), a hinged end clamping plate top plate (4 II), a bearing (5), a screw (6) for the clamping plate, a rotating shaft (7), a hinged end base anchoring screw (8), a hexagon bolt (9), a nut (10) and a test piece (11);
the fixed end beam pressing component (1) comprises a beam body (101), flange bases (102) are symmetrically arranged at four corners of two sides of the beam body (101), and reserved through holes (A) are formed in the flange bases (102);
the two fixed-end pressure beam components (1) are arranged up and down correspondingly, one end of a test piece (11) is positioned between the two fixed-end pressure beam components (1), four corners of the two fixed-end pressure beam components (1) are fixedly connected by a hexagon bolt (9) after penetrating through the long screw (2) for the fixed-end pressure beam through reserved through holes of the four corners, and the lower end of the long screw (2) for the fixed-end pressure beam is anchored to a reserved anchoring hole on the ground by the hexagon bolt (9);
the hinged end base component (3) comprises a bottom plate (301), reserved through holes (A) are symmetrically formed in two sides of the bottom plate (301), and the bottom plate (301) penetrates through an anchoring screw (8) of the hinged end base through the reserved through holes and then is anchored to the ground through a hexagon bolt (9); a hinged end base (302) is arranged on the bottom plate (301), step holes I (C) are symmetrically formed in lug seats (303) on two sides of the hinged end base (302), and each step hole I (C) is composed of a bearing hole (e) and a connecting hole (f);
the hinged end clamping plate bottom plate component (4I) comprises a base plate (401), reserved through holes (A) are formed in two sides of the base plate (401), lug plates (402) are symmetrically arranged on two sides of the bottom surface of the base plate (401), step holes II (D) are symmetrically formed in the two lug plates (402), and each step hole II (D) is formed by a bearing hole (e) and a connecting hole (f);
the hinged end base component (3) is connected with the hinged end clamping plate bottom plate component (4I) through the rotating shaft (7), namely the rotating shaft (7) penetrates through a connecting hole (f) of the step hole I (C) and a connecting hole (f) of the step hole II (D), and the bearing (5) is located in a bearing hole (e) of the step hole I (C) and a bearing hole (e) of the step hole II (D); nuts (10) are arranged at two ends of the rotating shaft (7);
reserved through holes (A) are symmetrically formed in two sides of the hinged end clamping plate top plate (4 II);
the other end of the test piece (11) is positioned between the hinged end clamping plate bottom plate component (4I) and the hinged end clamping plate top plate (4 II), and the two sides of the hinged end clamping plate bottom plate component (4I) and the hinged end clamping plate top plate (4 II) are fixedly connected through hexagon bolts (9) after penetrating through the clamping plate screw rods (6) through respective reserved through holes.
2. The boundary condition constraint device for realizing the fixation of one end and the simple support of one end of the self-weight drop hammer testing machine according to claim 1 is characterized in that: and a reserved hexagonal bolt groove (B) is formed in each reserved through hole (A).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910762942.6A CN110514381B (en) | 2019-08-19 | 2019-08-19 | Simply supported boundary condition restraint device for fixing one end of self-weight drop hammer testing machine |
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| CN201910762942.6A CN110514381B (en) | 2019-08-19 | 2019-08-19 | Simply supported boundary condition restraint device for fixing one end of self-weight drop hammer testing machine |
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| CN110514381B true CN110514381B (en) | 2021-02-05 |
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| CN106706419A (en) * | 2017-01-09 | 2017-05-24 | 中国铁道科学研究院铁道建筑研究所 | Device for simulating boundary condition of simple support during plate piece testing |
| CN106768779A (en) * | 2016-12-28 | 2017-05-31 | 武汉理工大学 | The mobile impact wheel load experimental rig and test method of a kind of clamped combination of freely-supported |
| CN106932270A (en) * | 2017-04-25 | 2017-07-07 | 沈阳建筑大学 | A kind of test fixture and its application method for simply supported beam fatigue loading |
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- 2019-08-19 CN CN201910762942.6A patent/CN110514381B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6918306B1 (en) * | 2003-09-08 | 2005-07-19 | The United States Of America As Represented By The Secretary Of The Navy | Adjustable flexure loading apparatus for testing long span beams |
| CN102494943A (en) * | 2011-10-25 | 2012-06-13 | 西安交通大学 | Adjustable test fixture |
| CN104729912A (en) * | 2015-03-17 | 2015-06-24 | 西安交通大学 | Adjustable multifunctional experimental clamp device |
| CN104913893A (en) * | 2015-05-11 | 2015-09-16 | 中南大学 | Drop hammer impact test device used for simulating vehicle collision |
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| CN110514381A (en) | 2019-11-29 |
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