CN204202955U - Be applicable to the biaxial stretch-formed test specimen of coated fabric film material - Google Patents
Be applicable to the biaxial stretch-formed test specimen of coated fabric film material Download PDFInfo
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- CN204202955U CN204202955U CN201420573320.1U CN201420573320U CN204202955U CN 204202955 U CN204202955 U CN 204202955U CN 201420573320 U CN201420573320 U CN 201420573320U CN 204202955 U CN204202955 U CN 204202955U
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- 238000012360 testing method Methods 0.000 title claims abstract description 76
- 239000000463 material Substances 0.000 title claims abstract description 65
- 239000004744 fabric Substances 0.000 title claims abstract description 33
- 238000005520 cutting process Methods 0.000 claims abstract description 17
- 230000007704 transition Effects 0.000 claims abstract description 14
- 230000015556 catabolic process Effects 0.000 abstract description 6
- 230000006378 damage Effects 0.000 abstract description 5
- 238000004458 analytical method Methods 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000012528 membrane Substances 0.000 description 11
- 238000007906 compression Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000005588 protonation Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A kind of biaxial stretch-formed test specimen being applicable to coated fabric film material, comprise cruciform coated fabric film material test specimen, four shape of rectangular ribbon of cruciform coated fabric film material examination are tapered to central area gradually closing, the conical nose intersection area of four shape of rectangular ribbon is circular arc chamfering transition, has one joint-cutting in the middle part of the taper position of four shape of rectangular ribbon.Utilize this biaxial stretch-formed test specimen can test out the biaxial stretch-formed breakdown strength of coated fabric film material more accurately.The connection of four limbs and center adopts the form of tapering transition, reduces the size of calibration zone, center, all adopts circular arc chamfering transition between test specimen four limbs, can accurately measure the biaxial stretch-formed breakdown strength of coated fabric film material.Finite element analysis is carried out to test specimen, cross taper joint-cutting test specimen core space stress distribution evenly, destruction due to cross taper test specimen all occurs in the nucleus of test specimen, can avoid destroying at bracketed part, for the complex stress condition of analyzing film material provides condition.
Description
Technical field
The utility model relates to a kind of biaxial tension-compression strength test specimen, is particularly useful for the biaxial stretch-formed test specimen for coated fabric film material in building membrane structure.
Background technology
Coated fabric film material is orthotropic material, a tension not pressurized, primarily of basic unit, coating and surface layer three part.Wherein basic unit is woven by various fabric fibre and forms, and determines the structural mechanics characteristic of film material.Coating and surface layer protection basic unit, and there is the effects such as self-cleaning, antipollution, permanance.The braided fiber of basic unit is mutually vertical, and be respectively warp fiber and weft fiber, the mechanical property difference of both direction (also known as work two axis) is larger.
In Practical Project, film material is that twin shaft is stressed, impact clearly by Protonation constant (comprise the stress ratio of both direction, loading velocity, load hold time) for its mechanical property, therefore when carrying out structure analysis, the constitutive relation parameter of membrane material all should derive from twin shaft test, and should be corresponding with application target, take corresponding testing program.
Film material biaxial tension-compression strength roughly has can be divided into following three classes: the test of cydariform twin shaft, the test of cylindric twin shaft and plane crisscross biaxial tension-compression strength.Circular membrane material test specimen is fixed on bulging limit by the test of cydariform twin shaft, by applying drum internal gas pressure and measuring the strain of circular membrane material test specimen to measure the engineering constant of film material under biaxial stress state.But this test can not change the ratio of face through broadwise stress.Cylindric twin shaft test, be made into cylindrical by film test specimen, two ends are rigid ends plectane, radius, ensure impermeability, then by gas injection valve injecting gas, and measure air pressure inside by rain glass.Wherein, film material warp-wise and broadwise can respectively as the buses of cylindric test specimen.Make film be subject to two-way tension inflation in cylinder, determine tension level according to air pressure inside, can realize through, broadwise stress ratio be the test of 2:1,1:1,1:2.The above two are cumbersome owing to operating, and the versatility of testing equipment is poor, so apply less.Film material biaxial tension-compression strength most widely used is at present the biaxial tension-compression strength of plane crisscross test specimen.This test method approximate supposition film material is two elastic axis through broadwise, by stressed for the film material plane stress problem be considered as under anisotropic elasticity.Two stretching aspects of cross shaped membrane material test specimen are parallel to film material warp-wise, broadwise respectively.Under different stretch ratio, measure the strain of the warp-wise load of film material test specimen, broadwise load and warp-wise and broadwise strain respectively by force snesor and displacement transducer.Setting X and Y-axis are two draw directions of biaxial tension-compression strength, i.e. the elastic symmetry axle of orthotropic plate, does not consider film material shear problem.
In the biaxial tension-compression strength of cruciform specimen, the installation of equipment operating, test specimen is more convenient.This test method generally can realize the two directions tension of film material, and the draw speed of both direction both can separately control, also can connecting move control, realizes the biaxial tension-compression strength under any different stretch speed proportional.But problem is in the manufacturing process of cruciform specimen, at the position that the cantilever of nucleus both direction connects, in order to prevent stress from concentrating, generally adopting transition arc, being aided with and carrying out multiple tracks joint-cutting on cantilever.The stress of the test specimen after above-mentioned process concentrates situation to be alleviated significantly.But the problem of the method is that the partial cross section of cantilever near central area is greater than the end of cantilever, can easily cause destroying in end after employing transition arc.Man-hour is added at test specimen, transition arc is larger, the alleviation degree that stress is concentrated is more obvious, and the difference in above-mentioned both (end cross-sectional and nucleus cross sections) is larger, will cause like this when carrying out failure test, test specimen often destroys in the end of test specimen, instead of our destruction of nucleus of wanting, therefore just can not analyze the destruction of film material under complex composite effect of stress.
Summary of the invention
The purpose of this utility model is the sufficient part overcome in prior art, provide a kind of method simple, easy to make, avoid test piece end to destroy, the biaxial stretch-formed test specimen of the coated fabric film material be applicable in building membrane structure.
For achieving the above object, the test specimen biaxial stretch-formed for coated fabric film material of the present utility model, comprise the cruciform coated fabric film material test specimen be made up of symmetrical rectangular band, four shape of rectangular ribbon of cruciform coated fabric film material test specimen leave the gripping section being suitable for holder, four shape of rectangular ribbon of described cruciform coated fabric film material examination are tapered to central area gradually closing, the conical nose intersection area of four shape of rectangular ribbon is circular arc chamfering transition, has one joint-cutting in the middle part of the taper position of four shape of rectangular ribbon.
The chamfer radius of described circular arc chamfering transition is taken as 1.5-2.0cm.
Described central area size is at least 6 × 6cm.
The length at the taper position of four described rectangular shaft is at least 14.4cm.
Beneficial effect: the utility model is applicable to the biaxial stretch-formed test specimen of coated fabric membrane material in building membrane structure, adopt and carry out tension test along draw direction and the stretching test method consistent with machine direction, namely, during cutting test specimen, cut out direction and be parallel to machine direction; Cut out direction applying pulling force along material cutting direction with perpendicular to material during test, now material can be subject to the effect of twin shaft pulling force.When test pulling force strengthens gradually, coated fabric class film material is destroyed.Test specimen is carried out to the process of cross taper joint-cutting, the connection of four limbs and center adopts the form of tapering transition, when cutting test specimen, considers respectively along draw direction and consistent with machine direction.After above-mentioned process, reduce the size of calibration zone, center, the stress of test specimen concentrates situation to be alleviated significantly, and stress distribution is more even, and in the elastic modulus and Poisson ratio test of current coated fabric class film material, application better.Carry out in finite element analysis to test specimen, the factor of stress concentration of the test specimen core space of joint-cutting cross taper is that 1.841 stress distribution are more even.Found by a large amount of biaxial tension-compression strength, the destruction of cross taper test specimen all occurs in the nucleus of test specimen, avoid and destroy at bracketed part, cross taper joint-cutting test specimen records the biaxial stretch-formed breakdown strength of film material more close to actual conditions, measure the biaxial stretch-formed breakdown strength value of film material more accurately, this for provide definite foundation to force analysis in the design of film material, construction, detection in Practical Project, for the complex stress condition of analyzing film material provides condition.Be applicable to the biaxial stretch-formed test specimen for coated fabric film material in building membrane structure, utilize this biaxial stretch-formed test specimen can test out the biaxial stretch-formed breakdown strength of coated fabric film material more accurately.This method is simple, and easy to make, test specimen can test out the biaxial stretch-formed breakdown strength of the coated fabric film material in building membrane structure more accurately.
Accompanying drawing illustrates:
Fig. 1 is loading schematic diagram of the present utility model:
In figure: 1-cruciform rectangular coupon; 2-gripping section; 3-fixture; 4-joint-cutting; 5-electron displacement meter.
Embodiment:
Below in conjunction with accompanying drawing, an embodiment of the present utility model is further described:
The test specimen biaxial stretch-formed for coated fabric film material of the present utility model, mainly contain the cruciform coated fabric film material test specimen 1 be made up of symmetrical rectangular band, four shape of rectangular ribbon of cruciform coated fabric film material test specimen 1 leave the gripping section 2 being suitable for fixture 3 and clamping, four shape of rectangular ribbon of described cruciform coated fabric film material test specimen 1 are tapered to central area gradually closing, the conical nose intersection area of four shape of rectangular ribbon is circular arc chamfering transition, one joint-cutting 4 is had in the middle part of the taper position of four shape of rectangular ribbon, electron displacement meter 5 is provided with in cruciform rectangular coupon 1 central area.The chamfer radius of described circular arc chamfering transition is taken as 1.5-2.0cm, central area size be at least 6 × 6cm, the length at the taper position of four rectangular shaft is at least 14.4cm.
Principle of work:
(1) for coated fabric class film material, cross taper joint-cutting test specimen is cut into.Circular arc chamfering transition is all adopted between test specimen four limbs, chamfer radius is taken as 1.8 centimetres, central core area size is approximately 6 cm x 6 centimetres, cantilever variable cross section part length is 14.4 centimetres, and arrange one joint-cutting in the middle of variable cross section part, retained part adopts heat seal consolidation process, during heat seal, membrane ends is overlapping, carry out the pressing of appropriate time with the temperature (about 260 DEG C) that film material fusing point is close, after diaphragm is melted, connect into entirety.The heat seal of diaphragm is double-deck, and during heat seal, the engaged width of diaphragm lap is greater than 10cm, adhesive-free during heat seal, and the material of its coupling part has been molten into one, and therefore the material behavior of coupling part is consistent with mother metal.
(2) employing carries out tension test along draw direction and the stretching test method consistent with machine direction, namely during cutting test specimen, cuts out direction and is parallel to machine direction; Cut out direction applying pulling force along material cutting direction with perpendicular to material during test, now material can be subject to the effect of twin shaft pulling force.
(3) instrument that adopts of tensile test specimen
Adopt isodromicing elongation's testing machine.Constant rate of elongation is 100 mm/min, and precision is ± 10%.Testing machine should have instruction or record and be added on and sample makes it stretch until the acting force that destroys and accordingly sample fracture development length device.On arbitrfary point in instrument full scale, the permissible error of instruction or record spacing jig is ± 1 millimeter.Fixture arranges and sample should be made in the process of being stretched slippage not to occur.The central point of two fixtures should be positioned on stretching axis, and clamping line should perpendicular to draw line.The clamping face of two fixtures should in same plane, and slightly wider than prepared sample.Fixture firmly should be clamped sample and make it not slide, but does not answer pinch off or damage sample.Fixture can adopt the level clamp added with gasket material, also can adopt the fixture of lines groove or corrugated surface.Electron displacement meter 5 is provided with in cruciform rectangular coupon 1 heart region.
Claims (1)
1. one kind is applicable to the biaxial stretch-formed test specimen of coated fabric film material, comprise cruciform coated fabric film material test specimen (1) be made up of symmetrical rectangular band, four shape of rectangular ribbon of cruciform coated fabric film material test specimen (1) leave the gripping section (2) being suitable for fixture (3) and clamping, it is characterized in that: four shape of rectangular ribbon of described cruciform coated fabric film material test specimen (1) are tapered to central area gradually closing, the conical nose intersection area of four shape of rectangular ribbon is circular arc chamfering transition, has one joint-cutting (4) in the middle part of the taper position of four shape of rectangular ribbon.
2. the biaxial stretch-formed test specimen being applicable to coated fabric film material according to claim 1, is characterized in that: the chamfer radius of described circular arc chamfering transition is taken as 1.5-2.0cm.
3. the biaxial stretch-formed test specimen being applicable to coated fabric film material according to claim 1, is characterized in that: described central area size is at least 6 ㎝ × 6cm.
4. the biaxial stretch-formed test specimen being applicable to coated fabric film material according to claim 1, is characterized in that: the length at the taper position of four described shape of rectangular ribbon is at least 14.4cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420573320.1U CN204202955U (en) | 2014-09-30 | 2014-09-30 | Be applicable to the biaxial stretch-formed test specimen of coated fabric film material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420573320.1U CN204202955U (en) | 2014-09-30 | 2014-09-30 | Be applicable to the biaxial stretch-formed test specimen of coated fabric film material |
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| CN204202955U true CN204202955U (en) | 2015-03-11 |
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| CN201420573320.1U Expired - Fee Related CN204202955U (en) | 2014-09-30 | 2014-09-30 | Be applicable to the biaxial stretch-formed test specimen of coated fabric film material |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104880351A (en) * | 2015-05-27 | 2015-09-02 | 南京航空航天大学 | One-way ceramic matrix composite plate test piece and preparation method thereof |
| CN104913975A (en) * | 2015-05-22 | 2015-09-16 | 南京航空航天大学 | Biaxial drawing-pressing test part with matrix fiber bundle and preparation method thereof |
| CN104913969A (en) * | 2015-05-22 | 2015-09-16 | 南京航空航天大学 | Biaxial tension-shear test part with matrix fiber bundle and preparation method thereof |
| CN106198219A (en) * | 2016-07-06 | 2016-12-07 | 北京航空航天大学 | A kind of method of testing of composite laminated plate biaxial stretching performance |
| CN106706430A (en) * | 2017-03-10 | 2017-05-24 | 山东大学 | Testing device for active biologic biaxial drawing and application thereof in soft material |
| CN107271275A (en) * | 2017-05-26 | 2017-10-20 | 上海交通大学 | A kind of biaxial stretch-formed strength test cruciform specimen and preparation method thereof |
| CN107290215A (en) * | 2017-06-23 | 2017-10-24 | 中国矿业大学 | A kind of Forecasting Methodology for coated fabric membrane material viscoelasticity constitutive behavior |
| CN107328666A (en) * | 2017-06-23 | 2017-11-07 | 上海交通大学 | A kind of fabric membrane material twin shaft shearing test method |
| CN107340184A (en) * | 2017-05-26 | 2017-11-10 | 上海交通大学 | Biaxial stretch-formed intensity test piece of diesis type compound fabric membrane material and preparation method thereof |
| CN107589143A (en) * | 2017-10-13 | 2018-01-16 | 公安部天津消防研究所 | Building film material material complete performance testing device and application method under power and heat radiation effect |
| CN107991177A (en) * | 2016-10-26 | 2018-05-04 | 中国科学院金属研究所 | A kind of method for testing the surrender of sheet metal twin shaft and Temperature measurement |
| CN108458940A (en) * | 2018-01-15 | 2018-08-28 | 东南大学 | The biaxial stretch-formed fatigue test piece and its test method of conic section transition |
| CN108760534A (en) * | 2018-05-30 | 2018-11-06 | 上海交通大学 | A kind of fabric membrane material twin shaft shear yield point and coefficient of rigidity test method |
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- 2014-09-30 CN CN201420573320.1U patent/CN204202955U/en not_active Expired - Fee Related
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| CN104913975A (en) * | 2015-05-22 | 2015-09-16 | 南京航空航天大学 | Biaxial drawing-pressing test part with matrix fiber bundle and preparation method thereof |
| CN104913969A (en) * | 2015-05-22 | 2015-09-16 | 南京航空航天大学 | Biaxial tension-shear test part with matrix fiber bundle and preparation method thereof |
| CN104880351B (en) * | 2015-05-27 | 2017-11-03 | 南京航空航天大学 | A kind of unidirectional ceramic matric composite flat test piece and preparation method thereof |
| CN104880351A (en) * | 2015-05-27 | 2015-09-02 | 南京航空航天大学 | One-way ceramic matrix composite plate test piece and preparation method thereof |
| CN106198219A (en) * | 2016-07-06 | 2016-12-07 | 北京航空航天大学 | A kind of method of testing of composite laminated plate biaxial stretching performance |
| CN106198219B (en) * | 2016-07-06 | 2018-11-27 | 北京航空航天大学 | A kind of test method of composite laminated plate biaxial stretching performance |
| CN107991177A (en) * | 2016-10-26 | 2018-05-04 | 中国科学院金属研究所 | A kind of method for testing the surrender of sheet metal twin shaft and Temperature measurement |
| CN106706430A (en) * | 2017-03-10 | 2017-05-24 | 山东大学 | Testing device for active biologic biaxial drawing and application thereof in soft material |
| CN107271275A (en) * | 2017-05-26 | 2017-10-20 | 上海交通大学 | A kind of biaxial stretch-formed strength test cruciform specimen and preparation method thereof |
| US11598702B2 (en) | 2017-05-26 | 2023-03-07 | Shanghai Jiao Tong University | Double-cross composite fabric membrane biaxial tensile strength test piece and manufacturing method thereof |
| CN107340184A (en) * | 2017-05-26 | 2017-11-10 | 上海交通大学 | Biaxial stretch-formed intensity test piece of diesis type compound fabric membrane material and preparation method thereof |
| CN107290215B (en) * | 2017-06-23 | 2019-05-21 | 中国矿业大学 | A kind of prediction technique for coated fabric membrane material viscoelasticity constitutive behavior |
| CN107328666A (en) * | 2017-06-23 | 2017-11-07 | 上海交通大学 | A kind of fabric membrane material twin shaft shearing test method |
| CN107328666B (en) * | 2017-06-23 | 2019-09-10 | 上海交通大学 | A kind of fabric membrane material twin shaft shearing test method |
| CN107290215A (en) * | 2017-06-23 | 2017-10-24 | 中国矿业大学 | A kind of Forecasting Methodology for coated fabric membrane material viscoelasticity constitutive behavior |
| CN107589143A (en) * | 2017-10-13 | 2018-01-16 | 公安部天津消防研究所 | Building film material material complete performance testing device and application method under power and heat radiation effect |
| CN107589143B (en) * | 2017-10-13 | 2024-01-02 | 应急管理部天津消防研究所 | Device for testing complete performance of building film material under force and heat radiation effects and application method |
| CN108458940A (en) * | 2018-01-15 | 2018-08-28 | 东南大学 | The biaxial stretch-formed fatigue test piece and its test method of conic section transition |
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| CN111289327A (en) * | 2020-03-16 | 2020-06-16 | 烟台宏远氧业股份有限公司 | Resin film test piece for DMA (direct memory Access) test and preparation method thereof |
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