CN102928287B - Tensile clamp for tensile property test of non-metal materials - Google Patents

Tensile clamp for tensile property test of non-metal materials Download PDF

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Publication number
CN102928287B
CN102928287B CN201210371473.3A CN201210371473A CN102928287B CN 102928287 B CN102928287 B CN 102928287B CN 201210371473 A CN201210371473 A CN 201210371473A CN 102928287 B CN102928287 B CN 102928287B
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adhesive
fixture
holding rod
block
universal joint
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CN102928287A (en
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韩建国
阎培渝
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Tsinghua University
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Tsinghua University
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Abstract

The invention discloses a tensile clamp for a tensile property test of non-metal materials, and belongs to the technical field of tests on material performances. The tensile clamp has the structure that an upper holding rod is positioned at the upper part of an upper limiting block, and the upper holding rod is fixedly connected with the upper limiting block; the upper holding rod is connected with an upper connecting plate through a universal joint; the middle of the universal joint is connected with the upper limiting block and the lower end of the universal joint respectively through pins; the lower end of the universal joint and the upper connecting plate are fixedly connected together; the upper connecting plate and a splicing plate are fixedly connected together through bolts; an upper splicing face is a face of the upper splicing plate; a lower holding rod is positioned at the lower part of a lower limiting block, and the lower holding rod and the lower limiting block are fixedly connected together; the lower limiting block and a lower connecting plate are fixedly connected together; the lower connecting plate and a lower splicing plate are fixedly connected together through bolts; a lower splicing face is a face of the lower splicing plate; and scales for positioning test samples are carved on the lower splicing face. The tensile clamp has high precision, is safe to use, and can carry out test on the tensile strength of test samples with large sections.

Description

A kind of nonmetallic materials stretch-proof performance test tension fixture
Technical field
The invention belongs to material properties test technical field, be specifically related to a kind of nonmetallic materials stretch-proof performance test tension fixture.
Background technology
U.S.'s mechanical test and Analogic Corp. (Mechanical Testing & Simulation MTS) are Material Testing Machine, particularly the well-known manufacturer of dynamic state material testing machine.The 647 type Wedge grippings that MTS testing machine is supporting, as shown in Figure 1, after changing the voussoir of different model, the plane or the V-type groove that utilize voussoir to provide, can be used for clamping sheet or the cylindric sample of different size.For example, but now the sample thickness of clamping or diameter are all less: 647 type Wedge grippings are after supporting different voussoir, and the thickness of maximum grip is 25.9mm, and the diameter of maximum grip is 26.2mm, wherein 647.25 type voussoir maximum grip diameters are 19.8mm.Therefore,, as realized the tension test of heavy in section sample (as the sectional dimension sample that is 100 * 100mm), need to be equipped with independent fixture.
For realizing the tensile property test to heavy in section sample, in practice, be badly in need of tension fixture a kind of and that 647.25 type voussoirs are supporting.
Do not retrieve the supporting tension fixture pertinent literature of YuMTS company 647.25 type voussoirs.
Summary of the invention
The shortcoming existing for above-mentioned prior art, the present invention proposes nonmetallic materials stretch-proof performance test tension fixture a kind of and that MTS testing machine 647.25 type voussoirs are supporting.
The supporting nonmetallic materials stretch-proof performance test of described a kind of and MTS testing machine 647.25 type voussoirs uses the structure of tension fixture as follows:
Described fixture comprises upper and lower two parts, top is divided and is comprised upper limit position block 1-2 and for by the upper holding rod 1-1 of testing machine voussoir 0-2 clamping, for the universal joint 1-5 of adjusting sample draw direction, upper junction plate 1-7, upper adhesive board 1-8 and for the upper adhesive surface 1-9 of bonding sample;
Described upper holding rod 1-1 is positioned at the top of described upper limit position block 1-2, and the two is fixed together, and the diameter of upper limit position block 1-2 is larger than upper holding rod 1-1; Described upper holding rod 1-1 is connected with upper junction plate 1-7 by universal joint 1-5; The universal joint middle part 1-3 of described universal joint 1-5 by pin 1-10 respectively with the function of upper limit position block 1-2(with universal joint 1-5 upper end) be connected with universal joint lower end 1-4; Between described universal joint lower end 1-4 and upper junction plate 1-7, be fixed together; Together with described upper junction plate 1-7 is bolted to connection with upper adhesive sheet 1-8; Described upper adhesive surface 1-9 is a face of upper adhesive board 1-8;
Described fixture bottom is divided and is comprised lower position block 2-2 and for by the lower holding rod 2-1 of testing machine voussoir 0-2 clamping, lower connecting plate 2-4, lower adhesive board 2-5 and for the lower adhesive surface 2-6 of bonding sample;
Described lower holding rod 2-1 is positioned at the bottom of described lower position block 2-2, and the two is fixed together, and the diameter of lower position block 2-2 is larger than lower holding rod 2-1; Described lower position block 2-2 is fixedly connected with lower connecting plate 2-4; Together with described lower connecting plate 2-4 is bolted to connection with lower adhesive sheet 2-5; Described lower adhesive surface 2-6 is a face of lower adhesive board 2-5, is carved with the scale mark 2-7 for sample location on described lower bonding plane 2-6.
The diameter of described upper holding rod 1-1 is preferably 19mm, is highly preferably 80mm, and the diameter of upper limit position block 1-2 is preferably 35mm, is highly preferably 40mm; The diameter of described lower holding rod 2-1 is preferably 19mm, is highly preferably 80mm, and the diameter of lower position block 2-2 is preferably 35mm, is highly preferably 40mm;
The manufactured materials of described fixture is selected carbon constructional quality steel except upper adhesive board 1-8 and lower adhesive board 2-5, upper adhesive board 1-8 and lower adhesive board 2-5 are used structural alloy steel or alloy tool steel, make the hardness of adhesive surface 1-9 and lower adhesive surface 2-6 be not less than 55HRC after being aided with suitable Technology for Heating Processing;
Upper adhesive surface 1-9 and the lower adhesive surface 2-6 of described fixture are smooth, smooth, and surface roughness parameter Ra is not more than 0.80 micron;
After prepared by described fixture, should adopt and boil black method and process, to improve its antirust ability;
Described universal joint 1-5 should rotate flexibly, fluent phenomenon.
The lower position block 2-2 that is positioned at part under described fixture, can pull open the distance between voussoir end face 0-5 and lower connecting plate 2-4; The reason that adopts this measure is between the Wedge gripping 0-1 and voussoir 0-2 due to MTS testing machine, in the process of clamping, can there is relative motion, cause the distance between Wedge gripping end face 0-4 and voussoir end face 0-5 in clamping process to be dwindled, distance in loosening process between two end faces increases, as shown in Figure 3.If there is no lower position block 2-2, in the process of sectional fixture, just may cause lower connecting plate 2-4 too small towards face and the distance between Wedge gripping end face 0-4 of lower holding rod 2-1, make test finish back wedge 0-2 and can not unclamp the clamping of lower holding rod 2-1, cause test incident to occur;
Under fixture described in being positioned at, on the surface of the lower adhesive surface 2-6 of part, be useful on the scale mark 2-7 of sample location, can be used for sample to be accurately bonded on the axis of lower bonding plane 2-6, improve the accuracy of test result;
The upper limit position block 1-2 that is arranged in part on described fixture has the upper holding rod 1-1 of restriction and at voussoir 0-2, clamps the function of the degree of depth; The direction of the adjustable sample of universal joint 1-5 in drawing process, makes sample stretch at its axis direction, avoids eccentric tension, guarantees the accuracy of test result;
The upper junction plate 1-7 of described fixture and upper adhesive sheet 1-8, lower connecting plate 2-4 and lower adhesive sheet 2-5 are bolted to connection, thereby adhesive sheet can be disassembled; The object that dismountable adhesive board is set is due to before test, between sample and adhesive board, need with very powerful glue (as epoxide-resin glue), bond, so that in test process, fail in tension is in originally generation with it rather than the generation of the junction between sample and adhesive board of sample; After to be tested completing, because the bonding between sample and adhesive board is very firm, therefore need to calcine the junction between sample and adhesive board by the method for high-temperature calcination, just can make the bonding failure between adhesive board and sample, therefore, dismountable adhesive board facilitates after off-test, and the high-temperature calcination realizing between adhesive board and sample is separated.
Beneficial effect of the present invention is:
Nonmetallic materials stretch-proof performance test provided by the invention has feature easy and simple to handle, that rotate flexibly, use safety and accurate positioning with tension fixture; Utilize this fixture can realize the drawing process of heavy in section sample, realize the isoparametric test of nonmetallic materials tensile strength and energy to failure.
Accompanying drawing explanation
Fig. 1 is 657 type Wedge grippings and the 647.25 voussoir schematic diagram of MTS testing machine;
In figure, 0-1 is Wedge gripping, and 0-2 is voussoir, and 0-3 is piston, and 0-4 is Wedge gripping end face, and 0-5 is voussoir end face;
Fig. 2 is the structural representation of tension fixture of the present invention; Wherein,
Fig. 2 a is the structural representation of part on described fixture;
In figure, 1-1 is upper holding rod, 1-2 is upper limit position block (the universal joint upper end of holding concurrently), 1-3 is universal joint middle part, and 1-4 is universal joint lower end, and 1-5 is universal joint, 1-6 is for the duct of erection bolt on upper junction plate and upper adhesive board, 1-7 is upper junction plate, and 1-8 is upper adhesive board, and 1-9 is upper adhesive surface; 1-10 is pin;
Fig. 2 b is the structural representation of part under described fixture;
2-1 is lower holding rod, and 2-2 is lower position block, 2-3 be on lower connecting plate and lower adhesive board for the duct of erection bolt, 2-4 is lower connecting plate, 2-5 is lower adhesive board, 2-6 is lower adhesive surface, 2-7 is scale mark;
Fig. 3 is 657 type Wedge grippings of MTS testing machine and the relative motion schematic diagram between 647.25 voussoir end faces; Wherein,
Fig. 3 a is that 657 type Wedge grippings of MTS testing machine and 647.25 voussoirs are at the schematic diagram not clamping under tension fixture state;
Fig. 3 b is 657 type Wedge grippings and the schematic diagram of 647.25 voussoirs under clamping tension fixture state of MTS testing machine;
Fig. 4 is the working state schematic representation of tension fixture of the present invention on MTS testing machine.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, tension fixture of the present invention is described further:
Embodiment 1:
For example to carry out the tensile strength test of a block concrete sample.
First the clamping device that MTS testing machine is respectively used to clamp on fixture of the present invention to part and lower part draws suitable distance, this distance with installation tension fixture after, remaining space can be placed sample to be tested and be had the surplus of 20-30mm to be as the criterion;
Respectively the upper part of tension fixture of the present invention and lower part are installed in the V-type groove of voussoir 0-2 of MTS testing machine, and clamp, as shown in Figure 4; Concrete installation process is as follows: first the upper holding rod 1-1 of part on tension fixture is filled in the V-type groove of voussoir 0-2, until upper limit position block 1-2 contacts with the end face of voussoir 0-2 towards the face of upper holding rod 1-1; Then start on MTS testing machine corresponding hydraulic selector, make the voussoir 0-2 upper holding rod 1-1 that holds with a firm grip; In the process gripping, the distance between the Wedge gripping end face 0-4 of MTS testing machine and voussoir end face 0-5 can be dwindled by relative motion; Then the lower part of tension fixture is installed on MTS testing machine, its installation process is identical with the method for part on installation tension fixture;
By for the concrete sample that bonds to the glue (as epoxide-resin glue) on tension fixture adhesive surface, be applied on the lower adhesive surface 2-6 of tension fixture, then concrete sample is placed on lower adhesive board 2-5, utilize the scale mark 2-7 on lower adhesive surface 2-6 to position concrete sample simultaneously, make the axis of concrete sample be positioned at the central authorities of lower adhesive surface 2-6; Then epoxide-resin glue is applied on the another side of concrete sample;
Start the displacement control program of MTS testing machine, make the Distance Shortened between tension fixture top and the bottom, until the epoxide-resin glue of smearing on the upper adhesive surface 1-9 of part and the upper surface of concrete sample on tension fixture contacts, proceed until epoxide-resin glue is stressed out a little; Then lock this state and continue 24 hours, so that epoxide-resin glue fully solidifies and produces enough cohesive strengths;
After epoxide-resin glue fully solidifies, the test procedure that starts MTS testing machine stretches to concrete sample, until concrete sample is fractured into two parts; In this process, obtain the loads change rule in its drawing process;
After having tested, the hydraulic selector of part and lower part on closing control clamping tension fixture, opens the gripping of voussoir 0-2 to holding rod, by the upper part of tension fixture and lower part successively, the concrete sample boning above together with them is unloaded down from the clamping device of MTS testing machine; By loosening the upper junction plate 1-7 of tension fixture and the bolt on lower connecting plate 2-4, upper adhesive board 1-8 and lower adhesive board 2-5 are pulled down, then by being bonded with the upper adhesive board 1-8 of concrete sample and lower adhesive board 2-5, putting into high temperature furnace and calcine (calcining heat is 800-1000 ℃ conventionally), the calcining duration is 10-20 minute, epoxide-resin glue was lost efficacy, realize the separated of concrete sample and adhesive board; After finally adhesive surface being cleaned out, restore and be fastened on corresponding web joint.

Claims (6)

1. a tension fixture is used in the test of nonmetallic materials stretch-proof performance, it is characterized in that, described clamp structure is as follows:
Described fixture comprises upper and lower two parts, and top is divided and comprised holding rod (1-1), upper limit position block (1-2), universal joint (1-5), upper junction plate (1-7), upper adhesive board (1-8) and upper adhesive surface (1-9);
Described upper holding rod (1-1) is positioned at the top of described upper limit position block (1-2), and the two is fixed together, and the diameter of upper limit position block (1-2) is larger than upper holding rod (1-1); Described upper holding rod (1-1) is connected with upper junction plate (1-7) by universal joint (1-5); The universal joint middle part (1-3) of described universal joint (1-5) is connected with universal joint lower end (1-4) with upper limit position block (1-2) respectively by pin (1-10); Between described universal joint lower end (1-4) and upper junction plate (1-7), be fixed together; Described upper junction plate (1-7) and upper adhesive sheet (1-8) are bolted to connection together; Described upper adhesive surface (1-9) is a face of upper adhesive board (1-8);
Described fixture bottom is divided and is comprised lower holding rod (2-1), lower position block (2-2), lower connecting plate (2-4), lower adhesive board (2-5) and lower adhesive surface (2-6);
Described lower holding rod (2-1) is positioned at the bottom of described lower position block (2-2), and the two is fixed together, and the diameter of lower position block (2-2) is larger than lower holding rod (2-1); Described lower position block (2-2) is fixedly connected with lower connecting plate (2-4); Described lower connecting plate (2-4) and lower adhesive sheet (2-5) are bolted to connection together; Described lower adhesive surface (2-6) is a face of lower adhesive board (2-5), is carved with the scale mark (2-7) for sample location on described lower bonding plane (2-6).
2. fixture according to claim 1, is characterized in that, the diameter of described upper holding rod (1-1) is 19mm, is highly 80mm, and the diameter of upper limit position block (1-2) is 35mm, is highly 40mm; The diameter of described lower holding rod (2-1) is 19mm, is highly 80mm, and the diameter of lower position block (2-2) is 35mm, is highly 40mm.
3. fixture according to claim 1, is characterized in that, the manufactured materials of described fixture is selected carbon constructional quality steel except upper adhesive board (1-8) and lower adhesive board (2-5); Upper adhesive board (1-8) and lower adhesive board (2-5) are used structural alloy steel or alloy tool steel.
4. fixture according to claim 1, is characterized in that, upper adhesive surface (1-9) and the lower adhesive surface (2-6) of described fixture are smooth, smooth, and surface roughness parameter Ra is not more than 0.80 micron, and hardness is not less than 55HRC.
5. fixture according to claim 1, is characterized in that, after prepared by described fixture, employing is boiled black method and processed, to improve its antirust ability.
6. fixture according to claim 1, is characterized in that, described universal joint (1-5) rotates flexibly, fluent phenomenon.
CN201210371473.3A 2012-09-28 2012-09-28 Tensile clamp for tensile property test of non-metal materials Active CN102928287B (en)

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Publication number Priority date Publication date Assignee Title
CN104155180A (en) * 2014-08-21 2014-11-19 四川富临集团成都机床有限责任公司 Method for testing tensile property of tensile machine
CN104764692A (en) * 2015-04-21 2015-07-08 中国工程物理研究院材料研究所 Testing device for testing bonding strength of coating specimen
CN106053233A (en) * 2016-07-21 2016-10-26 卡本复合材料(天津)有限公司 Carbon fiber sheet detecting device
CN106092786A (en) * 2016-07-25 2016-11-09 东莞前沿技术研究院 Rubbing test platform
CN108181177B (en) * 2017-10-30 2021-07-27 武汉船用机械有限责任公司 Tension testing device and method
CN107957370B (en) * 2017-11-16 2019-11-29 南通耀华建设工程质量检测有限公司 A kind of tensile propcrties measurement test fixture and method

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Publication number Priority date Publication date Assignee Title
EP2140245A1 (en) * 2007-05-01 2010-01-06 Ethiprint Ltd. Packaging testing apparatus
CN102323143A (en) * 2011-05-18 2012-01-18 西安近代化学研究所 Fixture for tensile bonding strength test of solid propellant and coating
CN202994575U (en) * 2012-09-28 2013-06-12 清华大学 Tensile fixture for testing stretch-resisting performance of non-metal materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2140245A1 (en) * 2007-05-01 2010-01-06 Ethiprint Ltd. Packaging testing apparatus
CN102323143A (en) * 2011-05-18 2012-01-18 西安近代化学研究所 Fixture for tensile bonding strength test of solid propellant and coating
CN202994575U (en) * 2012-09-28 2013-06-12 清华大学 Tensile fixture for testing stretch-resisting performance of non-metal materials

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