CN114459919A - Dynamic compression shear tester device - Google Patents
Dynamic compression shear tester device Download PDFInfo
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- CN114459919A CN114459919A CN202210305946.3A CN202210305946A CN114459919A CN 114459919 A CN114459919 A CN 114459919A CN 202210305946 A CN202210305946 A CN 202210305946A CN 114459919 A CN114459919 A CN 114459919A
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- 230000006835 compression Effects 0.000 title claims abstract description 17
- 238000007906 compression Methods 0.000 title claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 43
- 238000012360 testing method Methods 0.000 claims abstract description 32
- 238000010008 shearing Methods 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- 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
- G01N3/02—Details
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- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- 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 dynamic compression shear testing machine device which comprises a base, wherein reaction supports are fixed at two ends of the base, four wedge block gap eliminating devices are respectively arranged on the two reaction supports, a cross beam is jointly fixed at the upper ends of the two reaction supports, a vertical oil cylinder is fixed on the cross beam, the vertical pressure oil cylinder penetrates through the cross beam and extends to the lower end of the cross beam, an upper pressing plate is fixed at the tail end of a piston rod of the vertical oil cylinder, guide rails are fixed at two ends of the upper pressing plate, and the wedge block gap eliminating devices are arranged on the four guide rails. The invention adopts two counter-force supports and a host structure with an upper oil cylinder, the lower end of a workbench adopts a linear guide rail, a horizontal shearing oil cylinder adopts a swing shaft type shearing horizontal oil cylinder, the shearing oil cylinder part is connected with the workbench in a hinged seat connection mode, so that the whole system forms a self-counter-force frame structure, the gap is eliminated to the maximum extent, the influence of different tangential forces on the transverse and vertical load sensors in the test process is avoided, the test space is stepless and adjustable, the test requirements of different heights are facilitated, the rigidity of the whole machine is high, the deformation is small, no stress or deformation is generated by the gap in each direction, and the accuracy of measured data is ensured.
Description
Technical Field
The invention relates to the technical field of dynamic compression shear tests, in particular to a dynamic compression shear tester device.
Background
The basic structure of the dynamic compression shear testing machine basically comprises an upright column, a cross beam, a base, a counterforce frame, a vertical oil cylinder and a universal shear oil cylinder.
In order to solve the problem that a detection result of damage generated in a test of a sample (such as a seismic isolation rubber support) is not accurately influenced by a gap and deformation stress, the dynamic compression-shear test equipment is invented according to the national standard.
Disclosure of Invention
The invention mainly aims to solve the problem that a detection result of damage generated in a test of a sample (such as an earthquake isolation rubber support) is not accurately influenced by clearance and deformation stress.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dynamic compression shear testing machine device comprises a base, wherein reaction supports are fixed at two ends of the base, a cross beam is fixed at the upper ends of the two reaction supports together, a vertical oil cylinder is fixed on the cross beam, the vertical oil cylinder penetrates through the cross beam and extends to the lower end of the cross beam, an upper pressure plate is fixed at the tail end of a piston rod of the vertical oil cylinder, guide sliding blocks are fixed at two ends of the upper pressure plate, wedge block devices are arranged on the two guide sliding blocks, lateral reaction steel guide rails are fixed on the middle side walls of the two reaction supports, the lateral reaction steel guide rails are connected with the guide sliding blocks, and the wedge block devices are connected with the guide sliding blocks;
the automatic shearing machine is characterized in that two rolling linear guide rails are fixed on the base, two rolling sliding blocks are fixed on the two rolling linear guide rails, a workbench is jointly fixed at the upper ends of the four rolling sliding blocks, a feeding trolley and a workbench surface are arranged above the workbench, a hand-push device is arranged on one side of the trolley, a joint bearing is arranged on one side of the workbench and connected with a hinged base, and the hinged base is connected with a swing-shaft type shearing horizontal oil cylinder.
Preferably, the apparatus omits the upright post and only replaces the upright post with a counter support device to simultaneously provide support and self-reaction.
Preferably, the two reaction brackets are connected in a wedge gap eliminating manner, two notches are respectively arranged at the upper part and the lower part of each reaction bracket, two protruding supports are respectively arranged at the corresponding positions of the base and the cross beam connected with the reaction brackets, and after the wedge is embedded, the wedge is connected with the base and the cross beam through connecting bolts to be fastened.
Preferably, the base is connected with the workbench through two linear guide rails and four rolling slide blocks, the two linear guide rails are fixed on the base, the four rolling slide blocks are fixed at the bottom of the workbench, and guiding and moving are performed through relative movement of the rolling guide rail blocks and the linear guide rails.
Preferably, the transverse shearing device comprises a swing shaft type shearing horizontal oil cylinder fixed at one end of the base, and shafts on two sides of the swing shaft type shearing horizontal oil cylinder are connected with the base.
Preferably, the joint of the swing shaft type shearing horizontal oil cylinder and the workbench is connected in a hinge seat connection mode, the swing shaft type shearing horizontal oil cylinder is connected with the workbench through a joint bearing, then the joint bearing is connected with the swing shaft type shearing horizontal oil cylinder through a hinge device, and the joint bearing of the hinge seat is connected with the hinge seat through a pin shaft and a joint ball bearing.
Preferably, two guide rails are fixed at two ends of the upper pressure plate, a wedge block gap eliminating device is arranged on the corresponding guide slide block, two notches are respectively arranged at two sides of the upper pressure plate, and the wedge block is connected with the upper pressure plate through the notches by using a connecting bolt.
Compared with the prior art, the invention has the beneficial effects that:
1. the upper oil cylinder and the double-counter-force bracket type host structure are adopted, the linear bearing is adopted, the space is saved, the structure is simplified, the experimental space is stepless and adjustable, the experimental requirements of different heights are facilitated, the invalid interference clearance is eliminated by adopting a plurality of wedge block devices in the whole machine, and the accuracy and the correctness of the measured data are ensured;
2. the base and the cross beam are of an integral casting structure, so that the workpiece is high in rigidity and attractive and elegant in appearance;
3. the vertical oil cylinder is of a single-rod and two-way structure, and the final process of the inner hole of the oil cylinder is precise processing by a honing machine, so that the friction of the piston of the oil cylinder is reduced, the measurement precision of the testing machine is improved, and the service life of the testing machine is prolonged;
4. the vertical movement of the upper pressing plate adopts a wedge block device to eliminate the clearance, so that the test stability and the accuracy of the test result are improved;
5. the vertical freedom degree of the swing shaft type shearing horizontal oil cylinder is matched with the left and right freedom degrees of the hinge seat, and the relative position error caused by the concentrated stress generated by the equipment in the test process is eliminated.
In conclusion, the device adopts the oil cylinder overhead type and two counter-force bracket type host machine structures, so that the whole system forms a self-counter-force loading structure, and the influence of horizontal shearing force on a load sensor in the test process is avoided; meanwhile, the application of a plurality of wedge block devices eliminates interference data which influences experimental results and is generated by equipment gaps in a stressed state; the multi-degree-of-freedom displacement compensation matching of the swing shaft type shearing horizontal oil cylinder and the hinge seat reduces stress concentration of the equipment on the workbench due to the bidirectional acting force of the vertical oil cylinder and the shearing horizontal oil cylinder; the test space is stepless adjustable, the test requirements of different heights are met, the deformation of the whole machine is small, and the accuracy of the measured data is guaranteed.
Drawings
FIG. 1 is a schematic structural diagram of a dynamic compression shear tester according to the present invention;
FIG. 2 is an enlarged view of the structure at the position A of the dynamic compression-shear testing machine device provided by the invention;
FIG. 3 is an enlarged view of a structure at the position B of the dynamic compression-shear testing machine device provided by the invention;
FIG. 4 is an enlarged view of a structure at the position C of the dynamic compression-shear testing machine device provided by the invention;
FIG. 5 is an enlarged view of the structure at the position D of the dynamic compression-shear testing machine device provided by the invention;
in the figure: the device comprises a vertical oil cylinder 1, a cross beam 2, a counter force support 3, an upper pressure plate 4, a workbench 5, a hinged seat 6, a shearing horizontal oil cylinder 7, a base 8, a wedge block 9, a lateral counter force steel guide rail 10, a guide slider 11, a feeding trolley 12, a hand-push device 13, a connecting bolt 14, a connecting piece 15, a rolling slider 16, a joint bearing 17, a linear guide rail 18, a shaft 19, a stop dog 20 and a fixing bolt 21.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-5, a dynamic compression shear testing machine device comprises a base 8, wherein reaction supports 3 are fixed at two ends of the base 8, the upper ends of the reaction supports 3 are fixed on a cross beam 2, the upper ends of the two reaction supports 3 are jointly fixed with the cross beam 2, a vertical oil cylinder 1 is fixed on the cross beam 2, a host structure with two reaction supports 3 and vertical oil cylinders 1 arranged on the host structure is adopted, two notches are respectively arranged at the upper end and the lower end of each reaction support 3, and a wedge block 9 is arranged in each notch to eliminate gaps between each reaction support and the cross beam 2 and the base 8; lateral reaction steel guide rails 10 are installed in the middle of the reaction support 3, the vertical oil cylinder 1 penetrates through the cross beam 2 and extends to the lower end of the cross beam 2, an upper pressing plate 4 is fixed at the tail end of a piston rod of the vertical oil cylinder 1, the vertical oil cylinder 1 controls the upper pressing plate 4 to move up and down, the test space is stepless and adjustable, test requirements of different heights are facilitated, the application range is wide, guide sliding blocks 11 are fixed at two ends of the upper pressing plate 4, wedge blocks 9 are connected to the two guide sliding blocks 11, the upper pressing plate 4 and the guide sliding blocks 11 are fixed firmly by the wedge blocks 9, the lateral reaction steel guide rails 10 are fixed to the middle side walls of the two reaction supports 3, the guide sliding blocks 11 are connected to the lateral reaction steel guide rails 10, the wedge blocks 9 are connected to the guide sliding blocks 11 through connecting pieces 15, and the guide sliding blocks 11 and the lateral reaction steel guide rails 10 guide the stroke of the upper pressing plate 4.
Referring to fig. 1, two linear guide rails 18 are fixed on a base 8, two rolling sliders 16 are fixed on the two linear guide rails 18, a workbench 5 is fixed at the upper ends of the four rolling sliders 16, and the rolling sliders 16 facilitate movement of the workbench 5 and detection of a sample. The base 8 and the cross beam 2 are of an integral casting structure, the workpiece is high in rigidity, attractive and elegant in appearance, vertical, horizontal and dynamic and static servo coordination loading can be achieved, and a dynamic compression-shear correlation test is met.
Referring to fig. 2, when the upper press plate 4 moves up and down, the upper press plate 4 is subjected to a tangential force of the swing shaft type shearing horizontal oil cylinder 7, two openings are respectively arranged at two sides of the upper press plate 4, two wedge blocks 9 are placed in the openings and connected with a guide slide block 11 through a connecting piece 15, and the guide slide block 11 is in contact with a guide rail 10. After the connection is formed, the connecting bolts 14 are tightened, so that the two sides of the upper pressure plate 4 and the reaction force bracket 3 are tightly leaned together, and the function of eliminating the clearance is achieved.
Referring to fig. 3, the hinge device comprises a joint bearing 17 fixed at one end of the workbench 5, the joint bearing 17 is connected with the hinge seat 6 through a pin shaft, the hinge seat 6 is connected with the swing shaft type shearing horizontal oil cylinder 7, and when the equipment has a possible left-right swing trend due to stress, the hinge seat 6 can eliminate the influence of non-experimental force through compensating displacement.
Referring to fig. 4, the swing shaft type shearing horizontal oil cylinder 7 is partially in a swing shaft structure, is connected with the base 8 through a shaft 19, is fixed through a stop 20 and is fastened through a fixing bolt 21. When the equipment has a vertical deformation trend due to the compression of the sample in the test, the up-and-down freedom degree of the pendulum shaft can play a good role in compensation, and the stress concentration caused by the deformation trend is eliminated.
Referring to fig. 5, the principle of the wedge 9 device of the main machine part is the same as that of fig. 2, two notches are respectively arranged at the upper end and the lower end of the reaction bracket 3, the wedge 9 is fixed in the notches, and two end faces of the wedge 9 are respectively tightly attached to the bulges of the reaction bracket 3 and the cross beam 2 or the base 8 by screwing the connecting bolt 14, so that gaps between the reaction bracket 3 and the cross beam 2 and between the reaction bracket 3 and the base 8 are eliminated, and the test stability of the equipment and the accuracy of the test result are improved.
In the invention, when the test device works, a sample to be tested is fixed on the workbench 5 through the limiting groove, then the vertical oil cylinder 1 controls the upper pressure plate 4 to move downwards, the upper pressure plate 4 presses the sample downwards, the two reaction brackets 3 are respectively provided with the lateral reaction steel guide rail 10, the two reaction brackets 3 enable the whole system to form a self-reaction loading structure, and meanwhile, the gap is effectively eliminated through the use of the wedge block 9. After the horizontal shearing oil cylinder 7 moves to a proper position, the swing shaft type shearing horizontal oil cylinder 7 pulls the workbench 5 to move back and forth through the hinge base 6, the workbench 5 is convenient to move through the linear guide rail 18 and the rolling slide block 16, the linear guide rail 18 is arranged at the upper part of the base 8, the dynamic workbench 5 is arranged at the upper part of the base, the workbench 5 is connected to a piston rod of the swing shaft type shearing horizontal oil cylinder 7 through the hinge base 6 during horizontal shearing, and the swing shaft type shearing horizontal oil cylinder 7 is fixed on the base 8. The connection mode of the swing shaft type horizontal oil cylinder 7 and the hinge seat 6 forms four degrees of freedom, namely up, down, left and right degrees of freedom, can perfectly eliminate non-experimental force deformation of a three-dimensional space, carries out displacement compensation, and avoids interference on a measuring result of a load sensor in the test process.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The utility model provides a dynamic compression shear test machine device, includes base (8), its characterized in that: the anti-backlash device is characterized in that reaction supports (3) are fixed at two ends of the base (8), four wedge block (9) anti-backlash devices are respectively arranged on the two reaction supports (3), a cross beam (2) is jointly fixed at the upper ends of the two reaction supports (3), a vertical oil cylinder (1) is fixed on the cross beam (2), the vertical oil cylinder (1) penetrates through the cross beam (2) and extends to the lower end of the cross beam (2), an upper pressing plate (4) is fixed at the tail end of a piston rod of the vertical oil cylinder (1), wedge block anti-backlash devices are fixed at two ends of the upper pressing plate (4), lateral reaction steel guide rails (10) are fixed on the middle side walls of the two reaction supports (3), guide sliders (11) are mounted on the lateral reaction steel guide rails (10), and the anti-backlash devices are connected with the guide sliders (11);
two linear guide rails (18) are fixed on the base (8), two rolling sliding blocks (16) are fixed on the two linear guide rails (18), a workbench (5) is jointly fixed at the upper ends of the four rolling sliding blocks (16), a feeding trolley (12) and a workbench surface are arranged above the workbench, a hand-push device (13) is arranged on one side of the feeding trolley (12), a joint bearing (17) is arranged on one side of the workbench (5) and connected with a hinged base (6), and the hinged base (6) is connected with a swing-shaft type shearing horizontal oil cylinder (7).
2. A dynamic compression shear tester apparatus as claimed in claim 1, wherein the apparatus omits the column and only replaces the column with a reaction bracket (3) means serving both support and self-reaction structures.
3. A dynamic compression shear tester device according to claim 1, characterized in that the two reaction force brackets (3) are connected in a manner of clearance elimination by wedges (9), each reaction force bracket (3) has two notches at the upper and lower sides thereof, and the beam (2) and the base (8) connected thereto have two protruding supports at corresponding positions, and after the wedges (9) are embedded, the wedges (9) are connected with the base (8) and the beam (2) by connecting bolts (14) to be fastened.
4. The dynamic compression shear tester device according to claim 1, wherein the base (8) is connected with the worktable (5) through two linear guide rails (18) and four rolling sliders (16), the two linear guide rails (18) are fixed on the base (8), and the four rolling sliders (16) are fixed at the bottom of the worktable (5) and are guided and moved through the relative movement of the rolling sliders (16) and the linear guide rails (18).
5. A dynamic compression shear tester device as claimed in claim 1, wherein the lateral shearing means comprises a swing-axis type shearing horizontal cylinder (7) fixed at one end of the base (8), and the connection with the base (8) is made through shafts (19) at both sides of the swing-axis type shearing horizontal cylinder (7).
6. The dynamic compression shear tester device according to claim 1, wherein the joint of the swing shaft type shearing horizontal oil cylinder (7) and the workbench (5) is connected by a hinge seat (6), the swing shaft type shearing horizontal oil cylinder is connected with the workbench (5) through a joint bearing (17), then the joint bearing (17) is connected with the swing shaft type shearing horizontal oil cylinder (7) by the hinge seat (6), and the joint bearing (17) and the hinge seat (6) are connected by a pin shaft and a joint ball bearing.
7. The dynamic compression shear tester device according to claim 1, wherein an upper pressure plate (4) is fixed at the tail end of a piston rod of the vertical oil cylinder (1), guide sliding blocks (11) are fixed at two ends of the upper pressure plate (4), wedge block (9) clearance eliminating devices are arranged on the four guide sliding blocks (11), two notches are formed in two sides of the upper pressure plate (4), and the wedge blocks (9) are connected with the upper pressure plate (4) through connecting bolts (14) through the notches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210305946.3A CN114459919A (en) | 2022-03-25 | 2022-03-25 | Dynamic compression shear tester device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210305946.3A CN114459919A (en) | 2022-03-25 | 2022-03-25 | Dynamic compression shear tester device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114459919A true CN114459919A (en) | 2022-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210305946.3A Pending CN114459919A (en) | 2022-03-25 | 2022-03-25 | Dynamic compression shear tester device |
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| CN (1) | CN114459919A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487334A (en) * | 2013-09-17 | 2014-01-01 | 吉林大学 | Three-freedom degree dynamic compression and shear testing machine |
| CN204479400U (en) * | 2015-02-25 | 2015-07-15 | 长春新特试验机有限公司 | Rubber support pressure-shear test machine lateral shear device automatic following system |
| CN109520864A (en) * | 2019-01-25 | 2019-03-26 | 河南交院工程技术有限公司 | A kind of integral hydraulic pressure-shear test machine |
| CN209311203U (en) * | 2018-12-04 | 2019-08-27 | 山东三越仪器有限公司 | A kind of double guiding of compression-shear test system, self-reaction force disappear gap sliding equipment |
| CN112304769A (en) * | 2020-10-15 | 2021-02-02 | 济南三越测试仪器有限公司 | Dynamic tension-shear testing machine |
| CN214224731U (en) * | 2020-12-24 | 2021-09-17 | 山东三越仪器有限公司 | Reciprocal gap device that disappears of horizontal bearing capacity |
| CN215812213U (en) * | 2021-05-24 | 2022-02-11 | 中钢集团郑州金属制品研究院股份有限公司 | Ball-twisting gap eliminating mechanism |
| CN114112734A (en) * | 2021-12-08 | 2022-03-01 | 河南交院工程技术集团有限公司 | Feeding conversion mechanism of compression-shear testing machine |
| CN217878715U (en) * | 2022-03-25 | 2022-11-22 | 山东三越仪器有限公司 | Dynamic compression shear tester device |
-
2022
- 2022-03-25 CN CN202210305946.3A patent/CN114459919A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487334A (en) * | 2013-09-17 | 2014-01-01 | 吉林大学 | Three-freedom degree dynamic compression and shear testing machine |
| CN204479400U (en) * | 2015-02-25 | 2015-07-15 | 长春新特试验机有限公司 | Rubber support pressure-shear test machine lateral shear device automatic following system |
| CN209311203U (en) * | 2018-12-04 | 2019-08-27 | 山东三越仪器有限公司 | A kind of double guiding of compression-shear test system, self-reaction force disappear gap sliding equipment |
| CN109520864A (en) * | 2019-01-25 | 2019-03-26 | 河南交院工程技术有限公司 | A kind of integral hydraulic pressure-shear test machine |
| CN112304769A (en) * | 2020-10-15 | 2021-02-02 | 济南三越测试仪器有限公司 | Dynamic tension-shear testing machine |
| CN214224731U (en) * | 2020-12-24 | 2021-09-17 | 山东三越仪器有限公司 | Reciprocal gap device that disappears of horizontal bearing capacity |
| CN215812213U (en) * | 2021-05-24 | 2022-02-11 | 中钢集团郑州金属制品研究院股份有限公司 | Ball-twisting gap eliminating mechanism |
| CN114112734A (en) * | 2021-12-08 | 2022-03-01 | 河南交院工程技术集团有限公司 | Feeding conversion mechanism of compression-shear testing machine |
| CN217878715U (en) * | 2022-03-25 | 2022-11-22 | 山东三越仪器有限公司 | Dynamic compression shear tester device |
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