CN101430263A - Test piece for implementing biaxial tension-compression coupling stress state through uniaxial tension - Google Patents
Test piece for implementing biaxial tension-compression coupling stress state through uniaxial tension Download PDFInfo
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- CN101430263A CN101430263A CNA2008102277687A CN200810227768A CN101430263A CN 101430263 A CN101430263 A CN 101430263A CN A2008102277687 A CNA2008102277687 A CN A2008102277687A CN 200810227768 A CN200810227768 A CN 200810227768A CN 101430263 A CN101430263 A CN 101430263A
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Abstract
The invention belongs to the technical field of mechanical property measurement and particularly relates to a test piece which realizes bidirectional tension and compression coupling stress state by unidirectional stretching. The central part of a flat panel is bored with holes symmetrically to ensure that a decussation shape is formed at the central part. When pull is applied along unidirectional direction, the test piece bears the pull lengthways by self special shape and also applies the pressure to a central working area transversely, automatically and synchronously. The test piece is simple and convenient for using, does not require a complex matched clamp and can realize plane tension and compression coupling stress state just by the unidirectional stretching of the test piece by an existing unidirectional material testing machine directly; and a pressure field is applied synchronously and automatically by the self structure of the test piece without contacting with the outside of the test piece, thereby avoiding the disadvantage that the bidirectional stress state only can be realized by a double-shaft testing machine and also avoiding the problem of bidirectional synchronous concordant loading when using the double-shaft material testing machine.
Description
Technical field
The invention belongs to the mechanical property field of measuring technique, be specifically related to a kind of test specimen of realizing two-way tension and compression coupling stress state by unilateral stretching.
Background technology
In traditional materials mechanics experimental, unilateral stretching, unidirectional compression and biaxial tensile test are arranged, corresponding stress field is respectively unidirectional pulling force, uniaxial pressure and two-way pulling force.The reaction of research material under different stress, significant to the teaching and the scientific research of the character of full appreciation material, guiding material mechanics.
Realize that at present two-dimensional state of stress need adopt the biaxial material testing machine usually, loads test specimen respectively from both direction, to obtain two-way tension and compression coupling stress state.But the testing equipment more complicated that the biaxial material testing machine is required, and from both direction test specimen is loaded simultaneously, make the difficulty of synchronous coordination bigger, increased the complicacy of experimental implementation, the test findings error is bigger.
Summary of the invention
The present invention is directed to the existing deficiency that realizes the two-dimensional state of stress technology, a kind of test specimen of realizing two-way tension and compression coupling stress state by unilateral stretching is provided.It is characterized in that the outline of described test specimen is octagon; The two ends than long central axis at test specimen are symmetrical arranged two circular holes, are used to load the anchor clamps of cupping machine; On the central area of test specimen, be symmetrical arranged 4 holes that seamlessly transit, make the centre of test specimen present the right-angled intersection shape.
The polishing attenuation is passed through on two surfaces up and down at the right-angled intersection position of described test specimen central area, the thickness t 1=2 of test specimen～4mm, and the span of the thickness t 2 of central area is 0.5～1.0 times of specimen thickness t1.
Surface, described test specimen central area is connected by chamfered transition with four cross hang arms that are attached thereto, and the angle on inclined-plane is not more than 20 °.
The range of size of described test specimen is: test specimen long axis length L1=140～160mm, minor axis length W1=70～90mm, the edge lengths L2=20 parallel with major axis～40mm, the edge lengths W2=20 parallel with minor axis～40mm.
The center of circle of described test specimen two ends circular hole and the distance D 1=20～30mm that is parallel to the limit of test specimen minor axis, the diameter of phi 2=5 of circular hole～10mm.
The distance of two axis of centre distance test specimen in 4 holes, described test specimen central area equates, is D2=10～20mm; Bore dia Φ 1=20～30mm, chamfer radius R=1.5～5mm.
Beneficial effect of the present invention is: easy to use, do not need complex matched clamp, and directly utilize existing unidirectional Material Testing Machine, can realize the stress state of plane tension and compression coupling by the unilateral stretching of test specimen; Pressure field is that the structure by test specimen self applies synchronously automatically, outside contactless with test specimen, avoided using the twin shaft testing machine could realize the deficiency of this two-dimensional state of stress the bi-directional synchronization harmony loading problem when also having avoided simultaneously using the biaxial material testing machine.
Description of drawings
Fig. 1 (a) is a test specimen vertical view of the present invention;
Fig. 1 (b) is the sectional view of test specimen A-A face of the present invention;
Grid dividing figure when Fig. 2 carries out stress analysis for using finite element software to test specimen of the present invention;
Fig. 3 is that each components of stress at right-angled intersection position of test specimen of the present invention central area are with the change curve of load deflection;
Fig. 4 is that each components of strain at right-angled intersection position of test specimen of the present invention central area are with the change curve of load deflection.
Embodiment
The invention provides and a kind ofly realize the test specimen of two-way tension and compression coupling stress state by unilateral stretching, the invention will be further described below in conjunction with description of drawings and embodiment.
Fig. 1 (a) is a test specimen vertical view of the present invention; Fig. 1 (b) is the sectional view of test specimen A-A face of the present invention.The material of described test specimen is a mild carbon steel, and outline is octagon, wherein, and long axis length L1=150mm, minor axis length W1=80mm, the edge lengths L2=30mm parallel, the edge lengths W2=30mm parallel with minor axis with major axis; The two ends than long central axis at test specimen are symmetrical arranged two circular holes, are used to load the anchor clamps of cupping machine, the center of circle of circular hole and the distance D 1=20mm that is parallel to the limit of minor axis, bore dia Φ 2=7mm; On the central area of test specimen, be symmetrical arranged 4 holes that seamlessly transit, make the centre of test specimen present the right-angled intersection shape, the distance D 2=15.5mm of two axis of centre distance test specimen in 4 holes, bore dia Φ 1=25mm, chamfer radius R=2mm; With two surfaces up and down at the right-angled intersection position of test specimen central area by the polishing attenuation, the thickness t 1=4mm of test specimen, the thickness t 2=2mm of central area, two opposite side in central area equate that to the distance of test specimen central point the border, central area is 6mm to the vertical range of test specimen central point; Surface, test specimen central area is connected by chamfered transition with four cross hang arms that are attached thereto, and the angle on inclined-plane is 14 °.
During test, the two ends of test specimen are loaded on the anchor clamps of one directional tensile test machine, testing machine applies pulling force, and the stress state of two-way tension and compression coupling has promptly been realized in the centre of test specimen.The size of the strain of central cross crossover sites can be pasted foil gauge and be measured, and the size of tension and compression workspace, center ess-strain also can be provided by the finite element simulation result calculated.
This example has promptly provided the result of tension and compression coupling position, the center stress distribution that finite element simulation obtains, the grid dividing figure when Fig. 2 carries out stress analysis for using finite element software to test specimen of the present invention.Circular hole at two ends, the test specimen left and right sides applies displacement load, and size is 4mm, and the load time is 0.8ms, and the unit is a solid element.Fig. 3 is that each components of stress at right-angled intersection position of test specimen of the present invention central area are with the change curve of load deflection, as can be seen, the time dependent curve of tension and compressive stress is basically about S=0 straight line symmetry, both are more or less the same by absolute value, the shear stress change curve is pressed close to all the time on the S=0 straight line, size is essentially 0, can ignore.Fig. 4 be each components of strain at right-angled intersection position of test specimen of the present invention central area with the change curve of load deflection, the rule of each component variation is identical with the Changing Pattern of Fig. 4 stress.
Claims (6)
1. realize the test specimen of two-way tension and compression coupling stress state it is characterized in that the outline of described test specimen is octagon by unilateral stretching for one kind; The two ends than long central axis at test specimen are symmetrical arranged two circular holes, are used to load the anchor clamps of cupping machine; On the central area of test specimen, be symmetrical arranged 4 holes that seamlessly transit, make the centre of test specimen present the right-angled intersection shape.
2. a kind of test specimen of realizing two-way tension and compression coupling stress state by unilateral stretching according to claim 1, it is characterized in that, two surfaces up and down at the right-angled intersection position of described test specimen central area are by the polishing attenuation, the thickness t 1=2 of test specimen～4mm, the span of the thickness t 2 of central area is 0.5～1.0 times of specimen thickness t1.
3. a kind of test specimen of realizing two-way tension and compression coupling stress state by unilateral stretching according to claim 1, it is characterized in that, surface, described test specimen central area is connected by chamfered transition with four cross hang arms that are attached thereto, and the angle on inclined-plane is not more than 20 °.
4. a kind of test specimen of realizing two-way tension and compression coupling stress state by unilateral stretching according to claim 1, it is characterized in that, the range of size of described test specimen is: test specimen long axis length L1=140～160mm, minor axis length W1=70～90mm, the edge lengths L2=20 parallel～40mm with major axis, the edge lengths W2=20 parallel～40mm with minor axis.
5. a kind of test specimen of realizing two-way tension and compression coupling stress state by unilateral stretching according to claim 1, it is characterized in that, the center of circle of described test specimen two ends circular hole and the distance D 1=20～30mm that is parallel to the limit of test specimen minor axis, the diameter of phi 2=5 of circular hole～10mm.
6. according to claim 1ly a kind ofly realize it is characterized in that the test specimen of two-way tension and compression coupling stress state that the distance of two axis of centre distance test specimen in 4 holes, described test specimen central area equates, is D2=10～20mm by unilateral stretching; Bore dia Φ 1=20～30mm, chamfer radius R=1.5～5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102277687A CN101430263B (en) | 2008-12-02 | 2008-12-02 | Test piece for implementing biaxial tension-compression coupling stress state through uniaxial tension |
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| CN2008102277687A CN101430263B (en) | 2008-12-02 | 2008-12-02 | Test piece for implementing biaxial tension-compression coupling stress state through uniaxial tension |
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| CN101430263A true CN101430263A (en) | 2009-05-13 |
| CN101430263B CN101430263B (en) | 2011-08-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604699A (en) * | 2013-12-04 | 2014-02-26 | 中国飞机强度研究所 | Loading method for two-way tensile test |
| CN107389440A (en) * | 2017-06-29 | 2017-11-24 | 中车长春轨道客车股份有限公司 | A kind of biaxial fatigue test fixture |
| CN108122599A (en) * | 2016-11-30 | 2018-06-05 | 北京航天计量测试技术研究所 | One kind can tension compression bidirectional load X, Y two to pitching loading system regulating device |
| CN110296882A (en) * | 2019-04-22 | 2019-10-01 | 上海大学 | A kind of biaxial stretch-formed test specimen of cross silica gel and its preparation and stretching test method |
-
2008
- 2008-12-02 CN CN2008102277687A patent/CN101430263B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604699A (en) * | 2013-12-04 | 2014-02-26 | 中国飞机强度研究所 | Loading method for two-way tensile test |
| CN108122599A (en) * | 2016-11-30 | 2018-06-05 | 北京航天计量测试技术研究所 | One kind can tension compression bidirectional load X, Y two to pitching loading system regulating device |
| CN108122599B (en) * | 2016-11-30 | 2024-01-05 | 北京航天计量测试技术研究所 | Adjusting device of tensile-compressive bidirectional bearing X, Y bidirectional pitching loading system |
| CN107389440A (en) * | 2017-06-29 | 2017-11-24 | 中车长春轨道客车股份有限公司 | A kind of biaxial fatigue test fixture |
| CN110296882A (en) * | 2019-04-22 | 2019-10-01 | 上海大学 | A kind of biaxial stretch-formed test specimen of cross silica gel and its preparation and stretching test method |
| CN110296882B (en) * | 2019-04-22 | 2022-01-07 | 上海大学 | Cross-shaped silica gel biaxial tensile test piece and preparation and tensile test method thereof |
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| Publication number | Publication date |
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| CN101430263B (en) | 2011-08-17 |
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Granted publication date: 20110817 Termination date: 20121202 |