CN108844814A - A kind of braid material Hopkinson tension test clamp method - Google Patents
A kind of braid material Hopkinson tension test clamp method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 title claims abstract description 15
- 230000006835 compression Effects 0.000 claims abstract description 46
- 238000007906 compression Methods 0.000 claims abstract description 46
- 239000004744 fabric Substances 0.000 claims abstract description 29
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- 238000009864 tensile test Methods 0.000 claims abstract description 19
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
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- 230000007812 deficiency Effects 0.000 description 1
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- 239000003292 glue Substances 0.000 description 1
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Abstract
本发明公开了一种编织物材料Hopkinson拉伸试验用夹持方法，通过旋紧外六角螺栓促使压紧片与试件紧密接触，且外六角螺栓拧得越紧，压紧片对试件的夹紧力越大，使得在Hopkinson拉伸试验过程中试件与压紧片之间产生足够的摩擦力，保证二者之间不发生滑移；试件装夹后，压紧片的第一锥形部与外六角螺栓紧密接触，压紧片的第二锥形部与入射杆或透射杆紧密接触，使得在试验过程中压紧片和外六角螺栓与入射杆或透射杆之间不会产生滑移，从而保证了试验的试验结果的有效性和准确性。此外，本发明通过旋紧外六角螺栓实现对编织物试件的夹紧，操作方便、快速，可大幅提高编织物材料Hopkinson拉伸试验的试验效率。
The invention discloses a clamping method for the Hopkinson tensile test of braided fabric materials. By tightening the outer hexagonal bolts, the compression piece is closely contacted with the test piece, and the tighter the outer hexagonal bolt is screwed, the tighter the compression piece is to the test piece. The greater the clamping force, the greater the friction between the specimen and the compression piece during the Hopkinson tensile test to ensure that there is no slippage between the two; after the specimen is clamped, the first compression piece The tapered part is in close contact with the outer hexagonal bolt, and the second tapered part of the compression piece is in close contact with the incident rod or transmission rod, so that there will be no gap between the compression piece and the outer hexagonal bolt and the incident rod or transmission rod during the test. Slip is generated, thereby ensuring the validity and accuracy of the test results of the test. In addition, the invention realizes the clamping of the braided fabric test piece by tightening the hexagonal bolt, which is convenient and fast to operate, and can greatly improve the test efficiency of the Hopkinson tensile test of the braided fabric material.
Description
技术领域technical field
本发明涉及一种拉伸试样夹持方法，具体涉及一种编织物材料Hopkinson拉伸试验用夹持方法。The invention relates to a clamping method for a tensile sample, in particular to a clamping method for a Hopkinson tensile test of a braided fabric material.
背景技术Background technique
目前，材料的高应变率拉伸试验普遍采用动态Hopkinson拉伸试验技术，对于金属等硬质材料，受拉试件和Hopkinson杆的连接方法有螺纹连接、销钉连接等方法。如专利ZL201410495098.2公开的“一种克服Hopkinson拉杆试验中板条试件与杆件相对滑移的方法”，通过在Hopkinson拉杆上开槽，在垂直于开槽方向的中心开孔，利用销钉和Hopkinson杆的自锁功能进行连接，该方法能够有效避免板条试件与杆件之间发生相对滑移，可保证试验结果的有效性，并且在确保Hopkinson拉杆试验结果准确性的基础上，可大幅提高试验效率。At present, the dynamic Hopkinson tensile test technology is generally used in the high strain rate tensile test of materials. For hard materials such as metals, the connection methods between the tensile test piece and the Hopkinson rod include screw connection, pin connection and other methods. As disclosed in patent ZL201410495098.2 "a method for overcoming the relative slippage between the strip specimen and the bar in the Hopkinson tension bar test", by slotting the Hopkinson tension bar, opening a hole in the center perpendicular to the slotting direction, using a pin Connected with the self-locking function of the Hopkinson bar, this method can effectively avoid the relative slippage between the slab test piece and the bar, which can ensure the validity of the test results, and on the basis of ensuring the accuracy of the Hopkinson tie bar test results, It can greatly improve the test efficiency.
而对于编织物等软质材料进行动态Hopkinson拉伸试验，在高速拉伸过程中，如何保证试件的被夹持部分和Hopkinson拉杆之间不发生相对滑移并且能保证试件的变形发生在试件的中间有效部分是需要首先解决的难题。若采用金属板条试件的销钉连接方式夹持编织物材料，易造成编织物试件在销钉连接处发生破坏，造成试验结果不准。根据现有的文献资料记载，一些学者采用一种转换夹具，将编织物试件与转换夹具用胶粘结好后，再把转换夹具与Hopkinson杆连接。这种连接方式的弊端是：胶结固化需要一定的时间，且试验的过程中需要加工比较多的转换夹具来满足试验数量的要求。For the dynamic Hopkinson tensile test of soft materials such as braids, how to ensure that there is no relative slippage between the clamped part of the specimen and the Hopkinson rod during high-speed tension, and how to ensure that the deformation of the specimen occurs at The middle effective part of the specimen is the difficult problem that needs to be solved first. If the braided material is clamped by the pin connection method of the metal lath specimen, it is easy to cause the braided specimen to be damaged at the pin joint, resulting in inaccurate test results. According to the existing literature records, some scholars use a conversion fixture, after bonding the braided fabric specimen and the conversion fixture with glue, and then connect the conversion fixture with the Hopkinson bar. The disadvantage of this connection method is that it takes a certain amount of time for cementation and curing, and more conversion fixtures need to be processed during the test to meet the requirements of the number of tests.
发明内容Contents of the invention
本发明所要解决的技术问题是：针对现有技术的不足，提供一种编织物材料Hopkinson拉伸试验用夹持方法，该夹持方法操作方便、快速，可保证Hopkinson拉伸试验的试验结果的有效性和准确性，并大幅提高编织物材料Hopkinson拉伸试验的试验效率。The technical problem to be solved by this invention is: for the deficiencies in the prior art, provide a kind of braid material Hopkinson tensile test clamping method, this clamping method is easy to operate, fast, can guarantee the test result of Hopkinson tensile test. Effectiveness and accuracy, and greatly improve the test efficiency of the Hopkinson tensile test of braided fabric materials.
本发明解决上述技术问题所采用的技术方案为：一种编织物材料Hopkinson拉伸试验用夹持方法，包括以下步骤：The technical solution adopted by the present invention to solve the problems of the technologies described above is: a kind of braid material Hopkinson tensile test clamping method comprises the following steps:
（1）准备圆柱形的外径相同的入射杆半成品、透射杆半成品，并准备两根压紧片半成品；(1) Prepare cylindrical semi-finished incident rods and semi-finished transmission rods with the same outer diameter, and prepare two semi-finished compression pieces;
（2）在所述的入射杆半成品的一端沿其轴向加工出相通的第一锥形孔和第一内螺纹孔，所述的第一内螺纹孔设置在所述的第一锥形孔的前侧，所述的第一锥形孔的靠近所述的第一内螺纹孔的一端的孔径大于其另一端的孔径，在所述的入射杆半成品的另一端加工出外螺纹，得到入射杆，Hopkinson拉杆试验装置的撞击块上设置有与该外螺纹相配合的内螺纹；(2) Process the first tapered hole and the first internal threaded hole communicating with one end of the semi-finished incident rod along its axial direction, and the first internal threaded hole is set in the first tapered hole On the front side of the first tapered hole, the diameter of one end of the first tapered hole close to the first internally threaded hole is larger than the diameter of the other end, and an external thread is processed at the other end of the semi-finished incident rod to obtain the incident rod , the impact block of the Hopkinson tension bar test device is provided with an internal thread that matches the external thread;
（3）在所述的透射杆半成品的一端沿其轴向加工出相通的第二锥形孔和第二内螺纹孔，所述的第二锥形孔与所述的第一锥形孔的形状大小相同，所述的第二内螺纹孔与所述的第一内螺纹孔的形状大小相同，所述的第二内螺纹孔设置在所述的第二锥形孔的前侧，所述的第二锥形孔的靠近所述的第二内螺纹孔的一端的孔径大于其另一端的孔径，得到透射杆；(3) Machining a second tapered hole and a second internal threaded hole communicating with one end of the semi-finished transmission rod along its axial direction, the second tapered hole and the first tapered hole The shape and size are the same, the shape and size of the second internally threaded hole is the same as that of the first internally threaded hole, and the second internally threaded hole is arranged on the front side of the second tapered hole. The diameter of one end of the second tapered hole close to the second internally threaded hole is larger than the diameter of the other end to obtain a transmission rod;
（4）每根所述的压紧片半成品包括一体设置的圆柱部、第一锥形部和第二锥形部，所述的圆柱部与所述的第一锥形部的窄端相连，所述的第一锥形部的宽端与所述的第二锥形部的宽端相连，所述的第二锥形部分别与所述的第一锥形孔和所述的第二锥形孔相适配，以经过每根所述的压紧片半成品的轴线的平面为分割面，分别将两根所述的压紧片半成品分割，得到四片压紧片；(4) Each of the semi-finished pressing pieces includes a cylindrical part, a first tapered part and a second tapered part integrally arranged, the cylindrical part is connected to the narrow end of the first tapered part, The wide end of the first tapered portion is connected to the wide end of the second tapered portion, and the second tapered portion is connected to the first tapered hole and the second tapered hole respectively. The shape of the hole is matched, and the plane passing through the axis of each of the semi-finished compression pieces is used as the dividing plane, and the two semi-finished products of the compression piece are respectively divided to obtain four pieces of compression pieces;
（5）准备两个外六角螺栓，每个所述的外六角螺栓的头部开设有轴向通孔，所述的圆柱部与所述的轴向通孔相适配，每个所述的外六角螺栓的螺杆分别与所述的第一内螺纹孔和所述的第二内螺纹孔相适配，每个所述的外六角螺栓的螺杆内开设有锥形通孔，所述的锥形通孔与所述的轴向通孔同轴设置并相通，所述的锥形通孔的靠近所述的轴向通孔的一端的孔径小于其另一端的孔径，所述的第一锥形部与所述的锥形通孔相适配；(5) Prepare two hexagonal bolts, the head of each hexagonal bolt is provided with an axial through hole, the cylindrical part is adapted to the axial through hole, each of the hexagonal bolts The screw rods of the bolts are adapted to the first internally threaded hole and the second internally threaded hole respectively, and a tapered through hole is provided in the screw rod of each of the outer hexagonal bolts, and the tapered through hole is connected to the The axial through hole is coaxially arranged and communicated with each other, the diameter of one end of the tapered through hole close to the axial through hole is smaller than the diameter of the other end, and the first tapered part and the The tapered through hole described above is suitable;
（6）准备尺寸适宜的编织物试件，将所述的入射杆和所述的透射杆分别安装在Hopkinson拉杆试验装置上，使所述的入射杆与Hopkinson拉杆试验装置的撞击块螺纹连接；(6) Prepare a braided fabric test piece with a suitable size, install the incident rod and the transmission rod on the Hopkinson tension rod test device respectively, and thread the incident rod to the impact block of the Hopkinson tension rod test device;
（7）取两片压紧片，使其分割面重叠，再将一个外六角螺栓套在重叠后的该两片压紧片上，使第一锥形部位于该外六角螺栓的锥形通孔内且圆柱部自该外六角螺栓的轴向通孔穿出，将编织物试件的一端从圆柱部塞进该两片压紧片之间，将该外六角螺栓的螺杆缓慢旋入所述的入射杆上的第一内螺纹孔内，使第一锥形部与锥形通孔逐渐贴合，同时第二锥形部与第一锥形孔逐渐贴合，直至编织物试件的一端被两片压紧片紧密压紧；(7) Take two compression pieces, make their split surfaces overlap, and then put an outer hexagon bolt on the two overlapped compression pieces, so that the first tapered part is located in the tapered through hole of the outer hexagon bolt The inner and cylindrical part passes through the axial through hole of the outer hexagon bolt, insert one end of the braided fabric test piece from the cylindrical part between the two compression pieces, and slowly screw the screw rod of the outer hexagon bolt into the In the first internal threaded hole on the incident rod, the first tapered part and the tapered through hole gradually fit together, and at the same time the second tapered part and the first tapered hole gradually fit together until one end of the braided fabric specimen It is tightly compressed by two compression pieces;
（8）取另两片压紧片，使其分割面重叠，再将另一个外六角螺栓套在重叠后的该两片压紧片上，使第一锥形部位于该外六角螺栓的锥形通孔内且圆柱部自该外六角螺栓的轴向通孔穿出，将编织物试件的另一端从圆柱部塞进该两片压紧片之间，将该外六角螺栓的螺杆缓慢旋入所述的透射杆上的第二内螺纹孔内，使第一锥形部与锥形通孔逐渐贴合，同时第二锥形部与第二锥形孔逐渐贴合，直至编织物试件的另一端被另两片压紧片紧密压紧，即完成对编织物试件的夹持。(8) Take the other two compression pieces so that their split surfaces overlap, and then put another outer hexagon bolt on the two overlapped compression pieces, so that the first tapered part is located in the conical shape of the outer hexagon bolt. In the through hole and the cylindrical part passes through the axial through hole of the external hexagon bolt, insert the other end of the braided fabric specimen from the cylindrical part between the two compression pieces, and slowly turn the screw of the external hexagon bolt into the second internally threaded hole on the transmission rod, so that the first tapered part and the tapered through hole gradually fit together, and at the same time, the second tapered part and the second tapered hole gradually fit together until the braided fabric test The other end of the piece is tightly pressed by the other two compression pieces, which completes the clamping of the braided fabric test piece.
作为优选，每片所述的压紧片的分割面上设置有滚花或多个间隔的凸点，以增大编织物试件装夹后与压紧片之间的接触面积和摩擦力，确保对编织物试件的牢固夹持，进一步保证试验结果的有效性和准确性。As a preference, knurls or a plurality of spaced raised points are provided on the dividing surface of each said pressing piece, so as to increase the contact area and frictional force between the braided fabric specimen and the pressing piece after being clamped, Ensure the firm clamping of the braided specimen, further ensuring the validity and accuracy of the test results.
与现有技术相比，本发明的优点在于：本发明公开的编织物材料Hopkinson拉伸试验用夹持方法，对入射杆和透射杆进行了相应的加工处理，并加工了具有特定结构的四片压紧片和两个外六角螺栓，在安装编织物试件的过程中，通过旋紧外六角螺栓促使压紧片与试件紧密接触，且外六角螺栓拧得越紧，压紧片对试件的夹紧力越大，使得在Hopkinson拉伸试验过程中试件与压紧片之间产生足够的摩擦力，保证二者之间不发生滑移；试件装夹后，压紧片的第一锥形部与外六角螺栓紧密接触，压紧片的第二锥形部与入射杆或透射杆紧密接触，使得在Hopkinson拉伸试验过程中压紧片和外六角螺栓与入射杆或透射杆之间不会产生滑移，从而保证了Hopkinson拉伸试验的试验结果的有效性和准确性。此外，本发明通过旋紧外六角螺栓实现对编织物试件的夹紧，操作方便、快速，可大幅提高编织物材料Hopkinson拉伸试验的试验效率。Compared with the prior art, the present invention has the advantages of: the braid material Hopkinson tension test clamping method disclosed by the present invention has carried out corresponding processing on the incident rod and the transmission rod, and processed four special structures. In the process of installing the braided fabric specimen, tighten the hexagon bolt to make the compression piece closely contact with the test piece, and the tighter the outer hexagon bolt is tightened, the tighter the compression piece will be. The greater the clamping force of the specimen, the greater the friction between the specimen and the compression piece during the Hopkinson tensile test to ensure that there is no slip between the two; after the specimen is clamped, the compression piece The first tapered part of the compression piece is in close contact with the hexagonal bolt, and the second tapered part of the compression piece is in close contact with the incident rod or transmission rod, so that the compression piece and the external hexagonal bolt are in close contact with the incident rod or transmission rod during the Hopkinson tensile test. There will be no slippage between the transmission rods, thereby ensuring the validity and accuracy of the test results of the Hopkinson tensile test. In addition, the present invention realizes the clamping of the braided fabric test piece by tightening the hexagonal bolt, which is convenient and fast to operate, and can greatly improve the test efficiency of the Hopkinson tensile test of the braided fabric material.
附图说明Description of drawings
图1为实施例中入射杆的外观图；Fig. 1 is the exterior view of incident rod in the embodiment;
图2为实施例中透射杆的外观图；Fig. 2 is the exterior view of the transmission rod in the embodiment;
图3为实施例中两片相对放置的压紧片的正视图；Fig. 3 is the front view of two oppositely placed compression pieces in the embodiment;
图4为实施例中两片相对放置的压紧片的左视图；Fig. 4 is the left side view of two oppositely placed compression pieces in the embodiment;
图5为实施例中压紧片的仰视图；Fig. 5 is the bottom view of the compression piece in the embodiment;
图6为实施例中外六角螺栓的外观图；Fig. 6 is the exterior view of outer hexagon bolt in the embodiment;
图7为实施例中编织物试件的夹持状态图。Fig. 7 is a diagram of the clamping state of the braided fabric test piece in the embodiment.
具体实施方式Detailed ways
以下结合附图实施例对本发明作进一步详细描述。The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
实施例的编织物材料Hopkinson拉伸试验用夹持方法，包括以下步骤：The braid material Hopkinson tensile test clamping method of embodiment comprises the following steps:
（1）准备圆柱形的外径相同的入射杆半成品、透射杆半成品，并准备两根压紧片3半成品；(1) Prepare cylindrical semi-finished incident rods and semi-finished transmission rods with the same outer diameter, and prepare two pressing pieces 3 semi-finished products;
（2）在入射杆半成品的一端沿其轴向加工出相通的第一锥形孔11和第一内螺纹孔12，第一内螺纹孔12设置在第一锥形孔11的前侧，第一锥形孔11的靠近第一内螺纹孔12的一端的孔径大于其另一端的孔径，在入射杆半成品的另一端加工出外螺纹13，Hopkinson拉杆得到入射杆1，如图1所示，试验装置的撞击块（图中未示出）上设置有与该外螺纹13相配合的内螺纹；(2) Process the first tapered hole 11 and the first internal threaded hole 12 communicating with one end of the semi-finished product of the incident rod along its axial direction, the first internal threaded hole 12 is arranged on the front side of the first tapered hole 11, the second The aperture of one end near the first internally threaded hole 12 of a tapered hole 11 is greater than the aperture of the other end, and the other end of the semi-finished product of the incident rod is processed with an external thread 13, and the Hopkinson pull rod obtains the incident rod 1, as shown in Figure 1, the test The impact block (not shown in the figure) of the device is provided with an internal thread matched with the external thread 13;
（3）在透射杆半成品的一端沿其轴向加工出相通的第二锥形孔21和第二内螺纹孔22，第二锥形孔21与第一锥形孔11的形状大小相同，第二内螺纹孔22与第一内螺纹孔12的形状大小相同，第二内螺纹孔22设置在第二锥形孔21的前侧，第二锥形孔21的靠近第二内螺纹孔22的一端的孔径大于其另一端的孔径，得到透射杆2，如图2所示；(3) A second tapered hole 21 and a second internally threaded hole 22 communicating with each other are processed along the axial direction at one end of the semi-finished product of the transmission rod. The second tapered hole 21 has the same shape and size as the first tapered hole 11 . Two internally threaded holes 22 have the same shape and size as the first internally threaded hole 12, the second internally threaded hole 22 is arranged on the front side of the second tapered hole 21, the second tapered hole 21 is close to the second internally threaded hole 22 The aperture at one end is greater than the aperture at the other end to obtain a transmission rod 2, as shown in Figure 2;
（4）每根压紧片3半成品包括一体设置的圆柱部31、第一锥形部32和第二锥形部33，圆柱部31与第一锥形部32的窄端相连，第一锥形部32的宽端与第二锥形部33的宽端相连，第二锥形部33分别与第一锥形孔11和第二锥形孔21相适配，以经过每根压紧片3半成品的轴线的平面为分割面，分别将两根压紧片3半成品分割，得到四片压紧片3，如图3～图5所示；(4) Each pressing sheet 3 semi-finished product includes a cylindrical part 31, a first tapered part 32 and a second tapered part 33 integrally arranged, the cylindrical part 31 is connected with the narrow end of the first tapered part 32, and the first tapered part The wide end of the shape part 32 is connected with the wide end of the second tapered part 33, and the second tapered part 33 is adapted to the first tapered hole 11 and the second tapered hole 21 respectively, so as to pass through each pressing piece 3. The plane of the axis of the semi-finished product is the dividing plane, and the two compression pieces 3 are divided respectively to obtain four pieces of compression pieces 3, as shown in Figures 3 to 5;
（5）准备两个如图6所示的外六角螺栓4，每个外六角螺栓4的头部41开设有轴向通孔43，圆柱部31与轴向通孔43相适配，每个外六角螺栓4的螺杆42分别与第一内螺纹孔12和第二内螺纹孔22相适配，每个外六角螺栓4的螺杆42内开设有锥形通孔44，锥形通孔44与轴向通孔43同轴设置并相通，锥形通孔44的靠近轴向通孔43的一端的孔径小于其另一端的孔径，第一锥形部32与锥形通孔44相适配；(5) Prepare two outer hexagonal bolts 4 as shown in Figure 6. The head 41 of each outer hexagonal bolt 4 is provided with an axial through hole 43, and the cylindrical part 31 is adapted to the axial through hole 43. Each The screw rod 42 of the outer hexagonal bolt 4 is adapted to the first internally threaded hole 12 and the second internally threaded hole 22 respectively, and a tapered through hole 44 is provided in the screw rod 42 of each outer hexagonal bolt 4, and the tapered through hole 44 is connected to the The axial through hole 43 is coaxially arranged and communicated with each other. The diameter of one end of the tapered through hole 44 close to the axial through hole 43 is smaller than the diameter of the other end, and the first tapered portion 32 is adapted to the tapered through hole 44;
（6）准备尺寸适宜的编织物试件5，将入射杆1和透射杆2分别安装在Hopkinson拉杆试验装置上，使入射杆1与Hopkinson拉杆试验装置的撞击块螺纹连接；(6) Prepare a braided fabric specimen 5 with a suitable size, install the incident rod 1 and the transmission rod 2 on the Hopkinson tension rod test device respectively, and thread the incident rod 1 and the impact block of the Hopkinson tension rod test device;
（7）取两片压紧片3，使其分割面重叠，再将一个外六角螺栓4套在重叠后的该两片压紧片3上，使第一锥形部32位于该外六角螺栓4的锥形通孔44内且圆柱部31自该外六角螺栓4的轴向通孔43穿出，将编织物试件5的一端从圆柱部31塞进该两片压紧片3之间，将该外六角螺栓4的螺杆42缓慢旋入入射杆1上的第一内螺纹孔12内，使第一锥形部32与锥形通孔44逐渐贴合，同时第二锥形部33与第一锥形孔11逐渐贴合，直至编织物试件5的一端被两片压紧片3紧密压紧；(7) Take two pressing pieces 3 so that their split surfaces overlap, and then put an outer hexagonal bolt 4 on the two overlapping pressing pieces 3, so that the first tapered part 32 is located on the outer hexagonal bolt. 4 and the cylindrical part 31 passes through the axial through hole 43 of the hexagon bolt 4, and one end of the braided fabric test piece 5 is inserted between the two compression pieces 3 from the cylindrical part 31. Slowly screw the screw 42 of the external hexagon bolt 4 into the first internally threaded hole 12 on the incident rod 1, so that the first tapered portion 32 and the tapered through hole 44 are gradually fitted together, while the second tapered portion 33 Gradually fit the first tapered hole 11 until one end of the braided fabric test piece 5 is tightly compressed by two compression pieces 3;
（8）取另两片压紧片3，使其分割面重叠，再将另一个外六角螺栓4套在重叠后的该两片压紧片3上，使第一锥形部32位于该外六角螺栓4的锥形通孔44内且圆柱部31自该外六角螺栓4的轴向通孔43穿出，将编织物试件5的另一端从圆柱部31塞进该两片压紧片3之间，将该外六角螺栓4的螺杆42缓慢旋入透射杆2上的第二内螺纹孔22内，使第一锥形部32与锥形通孔44逐渐贴合，同时第二锥形部33与第二锥形孔21逐渐贴合，直至编织物试件5的另一端被另两片压紧片3紧密压紧，即完成对编织物试件5的夹持，如图7所示。(8) Take the other two pressing pieces 3 so that their split surfaces overlap, and then put another outer hexagonal bolt 4 on the two overlapping pressing pieces 3, so that the first tapered part 32 is located on the outer Inside the tapered through hole 44 of the hexagonal bolt 4 and the cylindrical part 31 passes through the axial through hole 43 of the outer hexagonal bolt 4, the other end of the braided fabric test piece 5 is inserted into the two compression pieces from the cylindrical part 31 3, slowly screw the screw 42 of the outer hexagonal bolt 4 into the second internal thread hole 22 on the transmission rod 2, so that the first tapered part 32 and the tapered through hole 44 are gradually attached, and at the same time the second tapered part The shape part 33 fits with the second tapered hole 21 gradually, until the other end of the braid test piece 5 is tightly pressed by the other two compression pieces 3, that is, the clamping of the braid test piece 5 is completed, as shown in Figure 7 shown.
本实施例中，每片压紧片3的分割面上设置有多个间隔的凸点34。在实际应用中，也可以在每片压紧片3的分割面上设置滚花，以增大编织物试件5装夹后与压紧片3之间的接触面积和摩擦力。In this embodiment, a plurality of spaced protrusions 34 are provided on the dividing surface of each pressing piece 3 . In practical applications, knurling can also be provided on the dividing surface of each pressing piece 3 to increase the contact area and frictional force between the braided fabric test piece 5 and the pressing piece 3 after being clamped.
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| CN110261252A (en) * | 2019-06-14 | 2019-09-20 | 武汉理工大学 | Hopkinson pressure bar experiment transmission bar and Hopkinson pressure bar experiment device |
| CN113237740A (en) * | 2021-05-08 | 2021-08-10 | 西北工业大学 | Clamping mechanism, device and method for Hopkinson bar stretching experiment of biological soft material |
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Application publication date: 20181120 |