CN101251453A - Crisscross test piece with slot on arm and attenuated center section - Google Patents
Crisscross test piece with slot on arm and attenuated center section Download PDFInfo
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- CN101251453A CN101251453A CNA2008101040814A CN200810104081A CN101251453A CN 101251453 A CN101251453 A CN 101251453A CN A2008101040814 A CNA2008101040814 A CN A2008101040814A CN 200810104081 A CN200810104081 A CN 200810104081A CN 101251453 A CN101251453 A CN 101251453A
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Abstract
The invention relates to a cruciform test piece with the slotted arm and the thinned type central area; a basic cruciform test piece is adopted as the base; the length and the width of the test piece are equal; transition arcs are positioned between the arms of a cruciform arm; slots in uniform alternation are arranged on the cruciform arm; the thinned central area has two symmetrical thinned surfaces; the invention is characterized in that: the thinned central area has the same width with the cruciform arm; the thinned area is of a square thinned shape or a combined thinned shape; the square thinned shape has circular bead transition with radius R between 12 mm and 20 mm; the transition can not be tangent to the end point of the slot; the transition of the combined thinned shape has three sections of tangential one-quarter arcs with the same radius r between 6 mm and 12 mm. In the invention, the thinned area has the same width with the arm in order that the stress calculation is convenient and accurate; the transition arc of the thinned area reduces the stress concentration. The test piece is used for bidirectional tensile tests under the complex loaded paths, increases the deformation amount and achieves big deformation.
Description
Technical field:
Crack on a kind of arm of the present invention and center attenuate type cruciform specimen, be specially the test specimen of sheet material two-way stretch experiment, belong to plate plastic forming technology field.
Background technology:
In plate Plastic Forming field, the plastic yielding behavior is important research focus always, especially along with many new technologies, new construction, the sheet material of new material and the continuous release of some new forming technologies, to the key of accurately determining in theory parsing and finite element analysis, to obtain precise results of yield behavior (comprising initial surrender and follow-up surrender).
Traditional experimental technique that is used for yield behavior research all has certain limitation.Use thin walled tube and can realize different strain pathses with test under interior pressure, axial load and the torsional load effect, but pipe fitting and sheet material there are a certain distance on performance in axial load; Availablely singly draw the combination of fundamental tests such as test, the test of plectane bulging, Plane Strain Test and compression test, but only can obtain as singly draw, plane strain or etc. two particular datas such as draw a little; By the bi-directional compression experiment glued together of polylith plate, can obtain different load paths by changing load mode, but because the error that friction causes can't be set up the accurate stress strain stress relation.At present, adopt plate shaped test specimen to carry out two drawing experiment to become recent main direction.
Plate shaped test specimen is two to be drawn in the experiment, and the cruciform two-way stretch becomes recent research focus.Along with the development of accurate manufacturing of experimental facilities and Computer Control Technology, the cruciform biaxial tensile test has become the complicated strain paths method the most easily that loads of research, and particularly it has the directly advantage of calculated stress, strain numerical value.By the load or the displacement size of control stretching diaxon, the pulling force ratio that changes the test specimen diaxon makes the center obtain different stress-strain states, realizes complicated the loading, obtains ess-strain distribution in Shuan La district under the different load paths, sets up relevant yield situation.Plane crisscross test specimen two-way stretch experimental technique just was suggested as far back as the sixties in 20th century, but just obtained some breakthroughs up in recent years, obtained relevant the application.
The subject matter of restriction plane crisscross test specimen two-way stretch experimental applications has
[1]: the 1. design of cruciform biaxial tension test piece and preparation, solution test specimen center ess-strain skewness, fillet place stress are concentrated greatly, diaxon load interferes with each other, is out of shape irregular and realize the center large deformation problem; 2. definite problem of the measurements and calculations method of test specimen center stress, strain, especially center stress; The control of 3. two-way stretch load mode is to realize different two different load paths such as loading, the loading of nothing unloading disproportional and bilinearity loading that draw.At present, solve preferably for the 3rd problem, crucial problem is the problems of measurement that solves center large deformation, unbalance stress and center stress, and emphasis is the design of cruciform specimen.
Realize all even large deformation of center stress distribution, both both connected each other, but specific implementation has conflicting place again.The researcher has designed the cruciform specimen of multiple multi-form center and spider.
For realizing the bigger deflection of center, some early stage researchs launch around spider, as adopt the cruciform specimen that increases a plurality of bosses or stiffening plate in welded or bolted way on spider, make the manufacturing procedure complexity of test specimen; Another kind is the test specimen of trapezoidal spider.The effect that can reach is all limited.
D.Banabic
[2], W.M ü ller etc.
[3]It is very big and be deep into the cruciform specimen of test specimen center to have provided a kind of fillet on the basis of Krei β ig achievement in research, and the existence of fillet makes the influence of shear stress bigger, and the center Stress calculation is inconvenient and inaccurate.
In order to solve the uneven problem of center normal stress, the cruciform specimen of fluting/seam type is suggested on the arm.Kuwabara etc.
[4]In its research, used the cruciform specimen that cracks on the arm, the center deflection that obtains also is limited.
Kelly
[5]Then the center attenuate is combined with the spider fluting, proposed the cruciform specimen that spider is separated with fluting.Demmerle and Boehler
[6]Provide several improved cruciform specimens, comprised the square attenuate in tie rod arm fluting+center, the circular attenuate in straight-arm fluting+center, hinge type spider+fluting.Some physical dimension parameters have been studied, as the spacing of slotting, groove width, radius of corner, center weakened section physical dimension etc. are to the influence of center stress, strain, think that the attenuate test specimen of thick door assembly with hinge and glass in right hand and left formula transition of more excellent arm and fluting can reach its purpose of design, but processed complex requires material thickness bigger.
Lin and Ding
[7]Adopted the form of fluting+center attenuate on the arm in its research, 4 grooves are arranged respectively on each spider, and 4 holes are used for loading stretching, the attenuate mode is reroll.
Green etc.
[8]Adopted the cruciform specimen of fluting, the square attenuate in center on the arm, but spider fluting skewness, and the thinning area width is less than the width of arm.Such advantage is to obtain moderate finite deformation, but center Stress calculation inconvenience.
Yu etc.
[9]Based on the ultimate strain analysis, cruciform specimen has been carried out optimal design.It adopts the design proposal of center secondary attenuate, cross flute profile attenuate before this, and then carry out circular attenuate at the center, concentrate on the center further to make distortion.But this design proposal is unfavorable for processing and preparing, and because complex-shaped, the center stress Calculation is difficulty.
WU XIANGDONG etc.
[10]Based on the purpose of plate yield behavior research, the slit type cruciform specimen has carried out optimal design on the employing arm, has provided comparatively suitable sample dimensions, and has analyzed in conjunction with the realization of complicated strain paths.Experiment shows, the deflection that this test specimen can only acquire a certain degree, equivalent strain about 0.02.
Summary is got up, and the form of cruciform specimen roughly has following several: plain edition, fluting/seam type on the arm, fluting/seam and center attenuate type on the arm, fillet type, spider are interlayer (reinforcement) type, trapezoidal spider type, spider are fluting/seam and center attenuate type on trapezoidal, the arm.
In these multi-form cruciform specimens, with crack on the arm/research of grooved is maximum, advantage be crack on the arm/groove can reduce even eliminate the shear stress of center greatly, thereby the principal axis of stress of distorted area, center and draw direction are overlapped, can measure the stress value that calculates the center so easily; Its shortcoming is that this test specimen only just is suitable for strengthening material, and the center distortion can be very not big, because have only after the metal in seam/groove zone has entered strain, test site, center stress just can reach sufficiently high level.The situation of spider prior to the center fracture often appears.Center attenuate type can realize the center moderate finite deformation, and still this test specimen need be processed the center and make its attenuation, must adopt suitable job operation to prepare test specimen; The test specimen that spider is strengthened implements comparatively difficulty then because the clamping difficulty is bigger.
[1] Han Fei, ten thousand is quick, WU XIANGDONG. sheet forming limit theory and recent progress in experimental study [J]. and plastic engineering journal, 2006,13 (5): 80-86
[2]D.Banabic，H.Aretz，D.S.Comsa.L.Paraianu.An?improved?analyticaldescription?of?orthotropy?in?metallic?sheets[J].International?Journal?of?Plasticity，2005.21(3)：493-512
[3]W.Müller，K.
New?experiments?for?determining?yield?loci?of?sheetmetal[J].Journal?of?Materials?Processing?Technology，1996.60：643-648
[4]Kuwabara?T，Bael?A?V，Iizuka?E.Measurement?and?analysis?of?yield?locus?andwork?hardening?characteristics?of?steel?sheets?with?different?r-values[J].Acta.Materialia，2002，50：3717-3729
[5]Kelly?A?A.Problems?in?creep?testing?under?biaxial?stress?system[J].J?StrainAnalysis，1976，11：1-6.
[6]Demmerle?S，Boehler?J?P.Optimal?design?of?biaxial?tensile?cruciformspecimens[J].Journal?of?Mech.Phys.Solids，1993，41(1)：143-181
[7]Lin?S?B，Ding?J?L.Experimental?study?of?the?plastic?yielding?of?rolled?sheetmetals?with?the?cruciform?plate?specimen[J].Int.J.Plast.，1995，11(5)：583-604
[8]Green?D，Makinde?A，Neale?K?W，MacEwen?S?R，Perrin?R.Experimentaldetermination?of?yield?surfaces?and?biaxial?flow?of?1145?aluminum?sheet[R].Research?Report，1998
[9] in bravely, ten thousand is quick, Zhou Xianbin. the cruciform specimen finite element design of analyzing based on ultimate strain [J]. and the journal .2001 of BJ University of Aeronautics ﹠ Astronautics, 27 (1): 105-108
[10] WU XIANGDONG, ten thousand is quick, Zhou Xianbin. finite element analogy of cruciform biaxial tensile test and analysis [J]. and plastic engineering journal, 2001,8 (2): 57-59
Summary of the invention:
The object of the present invention is to provide and crack on a kind of arm and center attenuate type cruciform specimen, to overcome the deficiencies in the prior art, provide a kind of and can realize the center large deformation, stress distribution is even and Stress calculation is convenient accurately, crack on the arm uniform, the center is square or the cruciform specimen of combined type attenuate, its sheet material two-way stretch that can be used under the complicated load path is tested, and can satisfy processing and preparing requirement easily.
The present invention is achieved through the following technical solutions.Adopt basic cruciform specimen as the basis, the test specimen length and width equate between the arm and arm of spider, arc transition is arranged; Have on the spider at interval and crack uniformly; The center thinning area is a two sides symmetry attenuate.It is characterized in that: width such as center thinning area and spider; Thinning area is shaped as square attenuate or combined type attenuate.Square attenuate has a round-corner transition in the center, R=12～20mm, and this transition can not be tangent with the end points that cracks; The transition of combined type attenuate is three sections 1/4 tangent circular arcs, and radius equates, r=6～12mm.
The invention provides and crack on a kind of arm and center attenuate type cruciform specimen, its advantage and effect are: thinning area width of the present invention equates to make calculated stress accurately convenient with the arm width; The round-corner transition of thinning area has then reduced stress and has concentrated.This test specimen is used for two-way stretch experiment under the complicated load path, improves deflection, reaches large deformation.
Description of drawings:
Fig. 1 is the cruciform specimen of citation form
Fig. 2 is the cruciform specimen after evenly cracking on the spider
Fig. 3 is the cruciform specimen uniform, the square attenuate in center that cracks on the arm
Fig. 4 is the cruciform specimen uniform, center combined type attenuate that cracks on the arm
Fig. 5 is the synoptic diagram of two sides, center symmetry attenuate
Fig. 6 is the cruciform specimen specific embodiment uniform, the square attenuate in center that cracks on the arm
Fig. 7 is the cruciform specimen specific embodiment uniform, center combined type attenuate that cracks on the arm
Embodiment:
Below in conjunction with drawings and Examples, technical scheme of the present invention is described further.
The present invention is achieved through the following technical solutions.Adopt basic cruciform specimen as the basis, the test specimen length and width equate that range of size is 360～380mm, the wide 84～108mm of spider; Between arm and arm, arc transition is arranged, knuckle radius is 2～6mm, sees Fig. 1.On spider, crack then (stitch wide by 0.2～0.5mm), at interval evenly, totally 11, see Fig. 2, the length of cracking is 40～60mm; Crack in addition at a end, leave the technology interval of l=1～2mm near the central area.At last at the central area attenuate, shown in Fig. 3,4; Width such as center thinning area and spider, and at sheet material two sides symmetry attenuate, the thickness ratio behind the attenuate is 0.5～0.7 (center thickness/arm thickness), sees Fig. 5; Thinning area is shaped as square or array configuration.Square attenuate has a round-corner transition in the center, R=12～20mm, and this transition can not be tangent with the end points that cracks, and sees Fig. 3; The transition of combined type attenuate is three sections 1/4 tangent circular arcs, and radius equates that r=6～12mm sees Fig. 4.
Embodiment one:
As shown in Figure 6, basic cruciform specimen is long * wide be 360mm * 360mm, the wide 96mm of spider, transition arc radius is 6mm between arm and the arm.Crack on the spider then, respectively crack 11, evenly, spacing 8mm stitches long 50mm at interval, and at the end near the central area, leaves the technology interval of l=1mm.At last two sides symmetry attenuate is carried out in the center, getting thickness is 0.6 than (center thickness/arm thickness), and radius of corner is 12mm, and thickness transition shown in Figure 5 is by the reduction process decision of being adopted.
Embodiment two:
As shown in Figure 7, basic cruciform specimen is long * wide be 360mm * 360mm, the wide 96mm of spider, transition arc radius is 4mm between arm and the arm.Crack on the spider then, respectively crack 11, evenly, spacing 8mm stitches long 50mm at interval, and at the end near the central area, leaves the technology interval of l=1mm.At last two sides symmetry attenuate is carried out in the center, its radius of arc transition of getting the thickness ratio and being 0.6, three section phase cut is 8mm, and thickness transition shown in Figure 5 is by the reduction process decision of being adopted.
Claims (3)
1, crack on a kind of arm and center attenuate type cruciform specimen, adopt basic cruciform specimen as the basis, the test specimen length and width equate between the arm and arm of spider, arc transition is arranged; Have on the spider at interval and crack uniformly; The center thinning area is a two sides symmetry attenuate; It is characterized in that: width such as center thinning area and spider; Thinning area is shaped as square attenuate or combined type attenuate.
2, crack on the arm according to claim 1 and center attenuate type cruciform specimen, it is characterized in that: described square attenuate has a round-corner transition in the center, R=12～20mm, and this transition can not be tangent with the end points that cracks.
3, crack on the arm according to claim 1 and center attenuate type cruciform specimen, it is characterized in that: the transition of described combined type attenuate is three sections 1/4 tangent circular arcs, and radius equates, r=6～12mm.
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893532A (en) * | 2010-07-28 | 2010-11-24 | 哈尔滨工业大学 | Three-dimensional cross-shaped biaxial tension test piece |
| CN101793645B (en) * | 2009-11-27 | 2011-09-14 | 清华大学 | Deformation-compensated high-strength metal sheet shear test block |
| CN105158074A (en) * | 2015-09-29 | 2015-12-16 | 北京航空航天大学 | Thermal environment two-way stretch cross test piece |
| CN105628491A (en) * | 2015-12-24 | 2016-06-01 | 合肥工业大学 | Metal plate two-way stretching large-deformation thickened test piece |
| 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 |
| CN108593432A (en) * | 2018-04-10 | 2018-09-28 | 同济大学 | Cross biaxial tension sheet metal test specimen and preparation method thereof for yield behavior test |
| EP3438640A4 (en) * | 2016-03-28 | 2020-02-26 | Mitsubishi Heavy Industries, Ltd. | Biaxial load test body, biaxial load testing device, and biaxial load testing method |
| CN111430229A (en) * | 2020-04-28 | 2020-07-17 | 长江存储科技有限责任公司 | Cutting method |
| CN113412569A (en) * | 2019-01-28 | 2021-09-17 | 博格华纳公司 | Distributed stator winding having parallel paths with intersecting end loops |
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2008
- 2008-04-15 CN CNA2008101040814A patent/CN101251453A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793645B (en) * | 2009-11-27 | 2011-09-14 | 清华大学 | Deformation-compensated high-strength metal sheet shear test block |
| CN101893532B (en) * | 2010-07-28 | 2012-04-18 | 哈尔滨工业大学 | Three-dimensional cross-shaped biaxial tension test piece |
| CN101893532A (en) * | 2010-07-28 | 2010-11-24 | 哈尔滨工业大学 | Three-dimensional cross-shaped biaxial tension test piece |
| CN105158074A (en) * | 2015-09-29 | 2015-12-16 | 北京航空航天大学 | Thermal environment two-way stretch cross test piece |
| CN105628491B (en) * | 2015-12-24 | 2018-11-23 | 合肥工业大学 | Sheet metal biaxial tension large deformation thickens test specimen |
| CN105628491A (en) * | 2015-12-24 | 2016-06-01 | 合肥工业大学 | Metal plate two-way stretching large-deformation thickened test piece |
| EP3438640A4 (en) * | 2016-03-28 | 2020-02-26 | Mitsubishi Heavy Industries, Ltd. | Biaxial load test body, biaxial load testing device, and biaxial load testing method |
| US10859478B2 (en) | 2016-03-28 | 2020-12-08 | Mitsubishi Heavy Industries, Ltd. | Biaxial load test specimen, biaxial load test apparatus, and biaxial load test method |
| 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 |
| CN107991177B (en) * | 2016-10-26 | 2020-09-18 | 中国科学院金属研究所 | Method for testing biaxial yield and hardening behaviors of metal plate |
| CN108593432A (en) * | 2018-04-10 | 2018-09-28 | 同济大学 | Cross biaxial tension sheet metal test specimen and preparation method thereof for yield behavior test |
| CN108593432B (en) * | 2018-04-10 | 2021-07-30 | 同济大学 | Cross-shaped biaxial tension metal sheet test piece for yield behavior test and preparation method thereof |
| CN113412569A (en) * | 2019-01-28 | 2021-09-17 | 博格华纳公司 | Distributed stator winding having parallel paths with intersecting end loops |
| CN113412569B (en) * | 2019-01-28 | 2024-01-23 | 博格华纳公司 | Distributed stator winding with parallel paths with intersecting end loops |
| CN111430229A (en) * | 2020-04-28 | 2020-07-17 | 长江存储科技有限责任公司 | Cutting method |
| CN111430229B (en) * | 2020-04-28 | 2023-12-01 | 长江存储科技有限责任公司 | Cutting method |
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Open date: 20080827 |