CN116026655B - Ultra-high molecular weight polyethylene laminated plate tensile test piece and clamping device thereof - Google Patents
Ultra-high molecular weight polyethylene laminated plate tensile test piece and clamping device thereof Download PDFInfo
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- CN116026655B CN116026655B CN202211721112.7A CN202211721112A CN116026655B CN 116026655 B CN116026655 B CN 116026655B CN 202211721112 A CN202211721112 A CN 202211721112A CN 116026655 B CN116026655 B CN 116026655B
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Abstract
The invention relates to an ultra-high molecular weight polyethylene laminated board tensile test piece and a clamping device thereof, which comprise an ultra-high molecular weight polyethylene laminated board tensile test piece, a laminated board anti-damage thickening layer and an ultra-high molecular weight polyethylene laminated board test piece clamping device, wherein the laminated board anti-damage thickening layer is fixedly arranged on the upper surface and the lower surface of the ultra-high molecular weight polyethylene laminated board tensile test piece, and the ultra-high molecular weight polyethylene laminated board tensile test piece and the outer part of the laminated board anti-damage thickening layer are detachably provided with the ultra-high molecular weight polyethylene laminated board test piece clamping device. The device introduces various acting force sources, solves the test difficulty caused by extremely low friction coefficient of the surface of the ultra-high molecular weight polyethylene laminated plate, can reduce the damage caused by non-stretching fracture of the test piece by changing the acting force distribution condition of each source, has the advantages of test cost and accuracy of results, and has good engineering guidance significance.
Description
Technical Field
The invention relates to the field of composite material performance tests, in particular to an ultra-high molecular weight polyethylene laminated plate tensile test piece and a clamping device thereof.
Background
The ultra-high molecular weight polyethylene laminate is a viable preference in the armor protection field because of its excellent tensile strength, high specific modulus, low density, and the like. To accurately develop the simulation research of the ultra-high molecular weight polyethylene laminated board, the accurate performance parameters of the ultra-high molecular weight polyethylene laminated board need to be obtained, and the development of tensile test to measure the tensile strength is the key to accurately simulate the protective performance of the laminated board. The existing mainstream specifications and standards are mainly aimed at performance tests of typical composite materials, however, the ultra-high molecular weight polyethylene laminated plate has an extremely low friction coefficient compared with the typical composite materials, so that when the ultra-high molecular weight polyethylene tensile test is carried out by adopting a typical composite material universal tensile test piece and a clamping tool thereof, the clamping tool fails because the maximum static friction force between the test piece and the tool is smaller than the tensile force between the test piece and the tool, and at the moment, the test piece does not reach the practical material limit tensile state until the test piece is in a state, thereby the purpose of acquiring a complete stress-strain curve cannot be achieved, and the test fails. The scholars aim at the problem, improve a typical tensile test piece and a clamping device thereof to improve the friction force between the test piece and a clamping tool, and the existing mainstream improvement method comprises the following steps: optimizing the shape of a test piece; the hydraulic clamp is adopted to increase the pressure; the bolt connection is added to the tensile test piece and the clamp to obtain a larger pulling force. The main improvement method is essentially to increase the friction force between the clamping tool and the test piece, however, due to the excellent tensile capacity of the ultra-high molecular weight polyethylene laminated plate, even if the test tool is improved, the fracture stress of the laminated plate is difficult to reach in each test, and meanwhile, in order to greatly enhance the friction between the clamping tool and the test piece, a series of problems are introduced into the existing improvement method, so that the accuracy of the tensile test is reduced. Specifically, the principle of the method adopting the hydraulic clamp is that the vertical pressure given by the clamping device to the tensile test piece is greatly increased to increase the friction between the clamping device and the tensile test piece, but the shearing action on the end part of the laminated plate is greatly increased by the method; the method for increasing the bolt connection is to transmit larger pulling force by using the bolt, so that the problem of insufficient pulling force obtained by friction is avoided, however, the method can cause the stress around the bolt hole to be obviously increased, and obvious fiber damage occurs. In summary, the existing improvement method still has a certain problem in the actual test operation, especially, the existing improvement method cannot reach the tensile force required by the fracture of the tensile test piece, so that a large number of tests need to be repeated to obtain a small amount of effective data, which causes great waste of materials and human resources, and unexpected damage to the tensile test piece is caused by the improvement method, so that the accuracy of data is often reduced.
Disclosure of Invention
The invention aims to solve the technical problems of providing the clamping device for the tensile test piece of the ultra-high molecular weight polyethylene laminated plate, which has the advantages of high success rate, high accuracy, simple disassembly and assembly, reasonable structure and advanced working principle.
The technical scheme adopted for solving the technical problems is as follows: the ultra-high molecular weight polyethylene laminated board tensile test piece and the clamping device thereof are constructed, the ultra-high molecular weight polyethylene laminated board tensile test piece, the laminated board anti-damage thickening layer and the ultra-high molecular weight polyethylene laminated board test piece clamping device are included, the laminated board anti-damage thickening layer is fixedly arranged on the upper surface and the lower surface of the ultra-high molecular weight polyethylene laminated board tensile test piece, and the ultra-high molecular weight polyethylene laminated board tensile test piece and the laminated board anti-damage thickening layer are detachably arranged outside.
According to the scheme, the clamping device for the ultra-high molecular weight polyethylene laminated plate test piece comprises an upper shell, a lower shell, a left shell, a right shell and a front shell, wherein the upper shell and the lower shell are respectively fixedly arranged on the upper surface and the lower surface of the laminated plate anti-damage thickening layer, the left shell and the right shell are respectively fixedly arranged on the outer surfaces of two sides of the ultra-high molecular weight polyethylene laminated plate tensile test piece, and the front shell is fixedly arranged at the front end of the ultra-high molecular weight polyethylene laminated plate tensile test piece.
According to the scheme, a plurality of first screw holes are formed in the edges of the upper shell and the lower shell, a plurality of second screw holes are formed in the edges of the left shell, the right shell and the front shell, the positions of the first screw holes and the positions of the second screw holes correspond to each other one by one, and the first screw holes and the second screw holes are used for being connected through bolts to achieve disassembly and assembly of all parts of the clamping device.
According to the scheme, the center of the upper shell and the center of the lower shell are provided with a plurality of third screw holes along the length direction and the width direction, the center of the anti-damage thickened layer of the laminated plate is provided with a plurality of fourth screw holes along the length direction and the width direction, the center of the stretching test piece of the ultra-high molecular weight polyethylene laminated plate is provided with a plurality of fifth screw holes along the length direction and the width direction, the apertures of the third screw holes, the fourth screw holes and the fifth screw holes are the same and correspond to each other in position one by one, and the third screw holes, the fourth screw holes and the fifth screw holes are used for being connected through bolts to realize the disassembly and assembly of the ultra-high molecular weight polyethylene laminated plate stretching test piece, the anti-damage thickened layer of the laminated plate and each part of the clamping device of the ultra-high molecular weight polyethylene laminated plate.
According to the scheme, the ultra-high molecular weight polyethylene laminated plate tensile test piece is a bone-shaped thin plate with wide clamping sections at two sides and narrow parallel sections in the middle, and a transition circular arc is arranged between the clamping sections and the parallel sections.
According to the scheme, the front end of the laminated board anti-damage thickening layer is flush with the front surface of the ultra-high molecular weight polyethylene laminated board tensile test piece, and the two side surfaces of the laminated board anti-damage thickening layer are flush with the two side surfaces of the clamping section of the ultra-high molecular weight polyethylene laminated board tensile test piece.
The ultra-high molecular weight polyethylene laminate tensile test piece and the clamping device thereof for implementing the invention have the following
The beneficial effects are that:
1. the invention focuses on the difficulty that the acting force of the clamping device to the tensile test piece is difficult to match with the tensile force required by tensile fracture due to extremely low friction coefficient and excellent tensile strength of the ultra-high molecular polyethylene laminated plate, and a single tensile force compensation method in the main flow clamping device is not adopted any more, but the clamping device is selected to be improved so as to obtain superposition of acting forces of two different sources to meet the requirement of the fracture tensile force, so that the number required by the two single acting forces is obviously reduced, the test requirement can be easily met, the success rate of the test is greatly improved, and the material loss, the labor and the time cost of the test are reduced;
2. according to the tensile test principle, the anti-damage thickening layer is skillfully added in the thickness direction of the clamping section of the tensile test piece, and the thickening layer has the following advantages that on one hand, the sectional area of the front end surface of the clamping section is greatly increased, so that the clamping device can provide the thrust force of the tensile test piece through the front end surface of the clamping section of the tensile test piece; on the other hand, the damage of the fiber and the matrix at the bolt connection opening is transferred to a thickened layer, so that the damage of a test piece caused by excessive clamping, such as shearing, compression and the like is reduced;
3. according to the invention, the length of the anti-damage thickening layer is changed to change the compensation tension transmitted by the bolt connection, so that the proportion of the compensation acting force of the bolt connection and the thrust of the clamping end is changed, and a better tension proportion is obtained, the damage to a test piece introduced by a damage mode except for tensile fracture is further reduced, and the reliability and the accuracy of a test result are improved;
4. the invention has the advantages of exquisite structure, better feasibility and stronger universality, solves the test difficulty caused by extremely low friction coefficient due to the characteristics of the ultra-high molecular weight polyethylene material, and has better engineering significance.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of the structure of a tensile test piece of an ultra-high molecular weight polyethylene laminate and a clamping device thereof according to the present invention;
FIG. 2 is a schematic structural view of a tensile test piece of an ultra high molecular weight polyethylene laminate of the present invention;
in the figure: 1. the clamping device for the ultra-high molecular weight polyethylene laminated plate test piece comprises a 2-laminated plate anti-damage thickening layer, a 3-ultra-high molecular weight polyethylene laminated plate tensile test piece, 11, an upper shell, 12, a left shell, 13, a front shell, 14, a lower shell, 15 and a right shell.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in figures 1-2, the ultra-high molecular weight polyethylene laminated board tensile test piece and the clamping device thereof comprise an ultra-high molecular weight polyethylene laminated board tensile test piece 3, a laminated board anti-damage thickening layer 2 and an ultra-high molecular weight polyethylene laminated board test piece clamping device 1, wherein the upper surface and the lower surface of the ultra-high molecular weight polyethylene laminated board tensile test piece 3 are fixedly provided with the laminated board anti-damage thickening layer 2, and the outer parts of the ultra-high molecular weight polyethylene laminated board tensile test piece 3 and the laminated board anti-damage thickening layer 2 are detachably provided with the ultra-high molecular weight polyethylene laminated board test piece clamping device 1. The working principle is that the thrust force given to the ultra-high molecular weight polyethylene laminated board tensile test piece 3 by the front shell 13 of the ultra-high molecular weight polyethylene laminated board test piece clamping device 1 and the tensile force of the anti-damage thickening layer 2 of the anti-damage laminated board of the ultra-high molecular weight polyethylene laminated board tensile test piece 3 transmitted to the ultra-high molecular weight polyethylene laminated board tensile test piece clamping device 1 through the bolt connection are superposed to obtain the acting force required by the ultra-high molecular weight polyethylene laminated board tensile test piece 3 for tensile fracture, and the working principle is that the problem that the test fails due to the fact that the acting force obtained by a single source is too small enough to compensate the tensile force required by the fracture is solved
The clamping device 1 for the ultra-high molecular weight polyethylene laminated plate test piece comprises an upper shell 11, a lower shell 14, a left shell 12, a right shell 15 and a front shell 13, wherein the upper shell 11 and the lower shell 14 are respectively fixedly arranged on the upper surface and the lower surface of the laminated plate anti-damage thickening layer 2, the left shell 12 and the right shell 15 are respectively fixedly arranged on the outer surfaces of two sides of the ultra-high molecular weight polyethylene laminated plate tensile test piece 3, and the front shell 13 is fixedly arranged at the front end of the ultra-high molecular weight polyethylene laminated plate tensile test piece 3. The edges of the upper shell 11 and the lower shell 14 are provided with a plurality of first screw holes, the edges of the left shell 12, the right shell 15 and the front shell 13 are provided with a plurality of second screw holes, the positions of the first screw holes and the second screw holes are in one-to-one correspondence, and the first screw holes and the second screw holes are used for being connected through bolts to realize the disassembly and assembly of all parts of the clamping device. The center of the upper shell 11 and the center of the lower shell 14 are provided with a plurality of third screw holes along the length direction and the width direction, the center of the laminated plate anti-damage thickening layer 2 is provided with a plurality of fourth screw holes along the length direction and the width direction, the center of the ultra-high molecular weight polyethylene laminated plate tensile test piece 3 is provided with a plurality of fifth screw holes along the length direction and the width direction, the apertures of the third screw holes, the fourth screw holes and the fifth screw holes are the same and correspond to each other in position one by one, and the third screw holes, the fourth screw holes and the fifth screw holes are used for being connected through bolts to realize the disassembly and the assembly of the ultra-high molecular weight polyethylene laminated plate tensile test piece 3, the laminated plate anti-damage thickening layer 2 and the ultra-high molecular weight polyethylene laminated plate test piece clamping device 1. Through bolted connection, can bear great pulling force with the anti-damage thickening layer 2 of laminated board replaces ultra-high molecular weight polyethylene laminated board tensile test piece 3, so avoided fiber and the base member damage of ultra-high molecular weight polyethylene laminated board tensile test piece 3 trompil department. The length of the laminated sheet anti-damage thickening layer 2 can be changed according to actual requirements, so that the number of the bolt connection is changed, and the acting force transmitted to the ultra-high molecular weight polyethylene laminated sheet tensile test piece 3 by the bolt connection is changed, and the proportion of the pushing force given to the ultra-high molecular weight polyethylene laminated sheet tensile test piece 3 by the outer shell 13 and the pulling force transmitted by the bolt connection is changed before the ultra-high molecular weight polyethylene laminated sheet test piece clamping device 1. The aim is to regulate and control the proportion of the acting force given to the ultra-high molecular weight polyethylene laminated plate tensile test piece 3 by two parts by changing the thickening layer, thereby obtaining better acting force proportion, introducing less damage and obtaining better test effect with lower material cost
The ultra-high molecular weight polyethylene laminated plate tensile test piece 3 is a bone-shaped thin plate with wide clamping sections at two sides and narrow parallel sections in the middle, and a transition circular arc is arranged between the clamping sections and the parallel sections. The front end of the laminated board anti-damage thickening layer 2 is flush with the front surface of the ultra-high molecular weight polyethylene laminated board tensile test piece 3, the two side surfaces of the laminated board anti-damage thickening layer 2 are flush with the two side surfaces of the clamping section of the ultra-high molecular weight polyethylene laminated board tensile test piece 3, and the thickness and the length of the laminated board anti-damage thickening layer 2 can be adjusted according to actual test results so as to keep balance between the cost of fiber materials and the test accuracy. The anti-damage thickening layer 2 of the laminated board is used for thickening the thickness of the front end of the clamping section of the stretching test piece 3 of the ultra-high molecular weight polyethylene laminated board, so that when the front end of the clamping section of the stretching test piece 3 of the ultra-high molecular weight polyethylene laminated board is subjected to the larger pulling force caused by the front shell 13 of the clamping device 1 of the ultra-high molecular weight polyethylene laminated board, the stretching test piece 3 of the ultra-high molecular weight polyethylene laminated board cannot cause overlarge local stress due to too small stress area (the sectional area of the front end of the clamping of the test piece) and lead to damage to front end fibers and a matrix.
The evaluation indexes of the test effect of the invention are the breaking position, the breaking morphology and the damage mode of the clamping end fiber of the parallel section of the ultra-high molecular weight polyethylene laminated plate tensile test piece 3.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (3)
1. The ultra-high molecular weight polyethylene laminated board tensile test piece and the clamping device thereof are characterized by comprising an ultra-high molecular weight polyethylene laminated board tensile test piece, a laminated board anti-damage thickening layer and an ultra-high molecular weight polyethylene laminated board test piece clamping device, wherein the upper surface and the lower surface of the ultra-high molecular weight polyethylene laminated board tensile test piece are fixedly provided with the laminated board anti-damage thickening layer, the outer parts of the ultra-high molecular weight polyethylene laminated board tensile test piece and the laminated board anti-damage thickening layer are detachably provided with the ultra-high molecular weight polyethylene laminated board test piece clamping device, the ultra-high molecular weight polyethylene laminated board test piece clamping device comprises an upper shell, a lower shell, a left shell, a right shell and a front shell, the upper shell and the lower shell are respectively fixedly arranged on the upper surface and the lower surface of the laminated board anti-damage thickening layer, the left side shell and the right side shell are respectively and fixedly arranged on the outer surfaces of the two sides of the ultra-high molecular weight polyethylene laminated plate tensile test piece, the front shell is fixedly arranged at the front end of the ultra-high molecular weight polyethylene laminated plate tensile test piece, a plurality of first screw holes are arranged at the edges of the upper shell and the lower shell, a plurality of second screw holes are arranged at the edges of the left side shell, the right side shell and the front shell, the positions of the first screw holes and the second screw holes are in one-to-one correspondence, the first screw holes and the second screw holes are used for realizing the disassembly and assembly of each part of the clamping device through the bolting, a plurality of third screw holes are arranged at the centers of the upper shell and the lower shell along the length direction and the width direction, a plurality of fourth screw holes are arranged at the centers of the anti-damage thickened layer of the laminated plate along the length direction and the width direction, a plurality of fifth screw holes are arranged at the centers of the ultra-high molecular weight polyethylene laminated plate tensile test piece along the length direction and the width direction, the apertures of the third screw hole, the fourth screw hole and the fifth screw hole are the same and correspond to each other in position one by one, and the third screw hole, the fourth screw hole and the fifth screw hole are used for being connected through bolts to achieve disassembly and assembly of the ultrahigh molecular weight polyethylene laminated plate tensile test piece, the laminated plate anti-damage thickening layer and each part of the ultrahigh molecular weight polyethylene laminated plate test piece clamping device.
2. The ultra-high molecular weight polyethylene laminated plate tensile test piece and clamping device thereof according to claim 1, wherein the ultra-high molecular weight polyethylene laminated plate tensile test piece is a bone-shaped thin plate with wide clamping sections at two sides and narrow parallel sections in the middle, and a transition circular arc is arranged between the clamping sections and the parallel sections.
3. The ultra-high molecular weight polyethylene laminate tensile test piece and clamping device thereof according to claim 1, wherein the front end of the laminate anti-fracture thickening layer is flush with the front surface of the ultra-high molecular weight polyethylene laminate tensile test piece, and both side surfaces of the laminate anti-fracture thickening layer are flush with both side surfaces of the clamping section of the ultra-high molecular weight polyethylene laminate tensile test piece.
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| CN202211721112.7A CN116026655B (en) | 2022-12-30 | 2022-12-30 | Ultra-high molecular weight polyethylene laminated plate tensile test piece and clamping device thereof |
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| CN202211721112.7A CN116026655B (en) | 2022-12-30 | 2022-12-30 | Ultra-high molecular weight polyethylene laminated plate tensile test piece and clamping device thereof |
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| CN116026655B true CN116026655B (en) | 2023-10-17 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202710399U (en) * | 2012-07-03 | 2013-01-30 | 南京新核复合材料有限公司 | Composite-material laminate bolt connection extruding strength single-lap joint test fixture |
| CN106769424A (en) * | 2016-12-12 | 2017-05-31 | 北京航空航天大学 | A kind of anti-unstability universal fixturing for edge/central indentation composite laminated plate compression performance test |
| CN115339163A (en) * | 2022-07-28 | 2022-11-15 | 广西师范大学 | Composite material laminated plate tensile sample considering aging effect and preparation method thereof |
-
2022
- 2022-12-30 CN CN202211721112.7A patent/CN116026655B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202710399U (en) * | 2012-07-03 | 2013-01-30 | 南京新核复合材料有限公司 | Composite-material laminate bolt connection extruding strength single-lap joint test fixture |
| CN106769424A (en) * | 2016-12-12 | 2017-05-31 | 北京航空航天大学 | A kind of anti-unstability universal fixturing for edge/central indentation composite laminated plate compression performance test |
| CN115339163A (en) * | 2022-07-28 | 2022-11-15 | 广西师范大学 | Composite material laminated plate tensile sample considering aging effect and preparation method thereof |
Non-Patent Citations (2)
| Title |
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| 赵莹等编著.《超高分子量聚乙烯纤维》.国防工业出版社,2018,第206页. * |
| 赵莹等编著.《超高分子量聚乙烯纤维》.国防工业出版社,2018,第239-241页. * |
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