CN110346212A - A kind of quick testing auxiliary device of plate plane strain limit and test method - Google Patents
A kind of quick testing auxiliary device of plate plane strain limit and test method Download PDFInfo
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- CN110346212A CN110346212A CN201910679297.1A CN201910679297A CN110346212A CN 110346212 A CN110346212 A CN 110346212A CN 201910679297 A CN201910679297 A CN 201910679297A CN 110346212 A CN110346212 A CN 110346212A
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- sample
- auxiliary device
- plane strain
- test
- strain
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
The invention discloses a kind of quick testing auxiliary device of plate plane strain limit and test methods, belong to automobile board technical field of performance test, it needs for same sample to be processed into multiple samples for current material plane strain limit test method, the problems such as test quantity is big, data are unstable, and the special sheet material forming testing machine of needs just can be carried out test.The present invention provides a kind of quick testing auxiliary devices of plate plane strain limit, it is made of latch, clamping screw and crossbeam, the device can be clamped in the middle part of rectangular plate sample, it can be in sample drawing process, remain that sample transverse strain is zero, it is stretched to and necking down occurs and can be obtained plate plane strain limit, dedicated sheet material forming testing machine can be replaced using common cupping machine when test.
Description
Technical field
The invention belongs to automobile board technical field of performance test, be related to a kind of plate plane strain limit quickly test it is auxiliary
Help device and test method.
Background technique
Determined using Forming Limit of Sheet Metals curve FLD auto parts with sheet material forming performance be it is the most intuitive in industry and
The method generallyd use.Test plate shaping limit curve mainly utilizes dedicated sheet material forming testing machine at present, to multiple
Various sizes of sample be formed then test until there is micro-crack the cracked near sites of these samples master,
Secondary dependent variable marks coordinate points and draws curve.
In FLD mostly important data point be the plane strain limit, i.e., principal strain limiting value when secondary dependent variable is zero, but
It is that the indexs such as the mechanical property due to different materials plate, thickness, plate and forming mould surface coefficient of friction are different,
It is difficult to accurately determine plane strain point on single forming exemplar, a large amount of different size exemplars is needed to be measured.Sample passes through line
It cuts or washes and cut dumbbell shape as defined in processing, length is usually 180mm, and test section width specifications are 10 kinds, is distributed in 20-
Within the scope of 180mm, every kind of width specifications sample number is 5.Using this method, 50 point datas need to be tested, it is bent to draw a forming
Line.Required exemplar quantity is more, processing, test and data processing work amount it is very big, and due to mold lubrication, material property etc. because
Element limitation, causes data unstable, often to carry out retest.
The present invention is directed to propose a kind of quick testing auxiliary device of plate plane strain limit includes matched plane
Strain measurement sample and test method, using the auxiliary device directly on common cupping machine Accurate Determining rectangular specimen
The plane strain limit can quickly be drawn out then in conjunction with the single plane strain limit of material stress strain law utilization
Shaping limit curve, using the device, when test, common cupping machine replaced dedicated sheet material forming testing machine, can larger amplitude
Equipment investment is reduced, sample replaces dumb-bell shape using rectangular specimen, reduces labor content, sample size is kept to 1 by 10 kinds
Kind, workload can be greatly decreased compared with conventional method, and test data is stablized.
Summary of the invention
The present invention is directed to propose a kind of quick testing auxiliary device of plate plane strain limit includes matched plane
Strain measurement sample and test method, using the auxiliary device directly on common cupping machine Accurate Determining plane strain pole
Limit quickly draws out shaping limit curve then in conjunction with material stress strain rule, work can be greatly decreased compared with conventional method
Amount, while substantially shortening the shaping limit curve testing time.
A kind of quick testing auxiliary device of plate plane strain limit, is made of latch 5, clamping screw 7 and crossbeam 8,
8 length of crossbeam is equal with width in the middle part of sheet coupon, and 8 both ends of crossbeam are sample holder portion, is equipped with locking in sample holder portion
Plate 5, sample holder portion are provided with threaded hole, and clamping screw 7 passes through threaded hole and connect with the screw that latch 5 is arranged；
Screw thread bore dia 10mm in the auxiliary device, two threaded hole centre distance 48mm~148mm.
The plane strain limit test method:
1) auxiliary device is transversely mounted on sample strain region and is locked before test,
2) in sample drawing process, remain that sample transverse strain is zero, until there is necking down, test stops, contracting
The longitudinal strain principal strain of neck region is the plane strain limit.
The installation number of auxiliary device when the plane strain limit test is 1,3 or 5 according to specimen length.
When the auxiliary device quantity is 1, it is mounted among sample, when auxiliary device quantity is 3 or 5, peace among sample
One is filled, remaining is symmetrically installed in sample strain region.
The shaping limit curve drawing drawing method: it is established directly using stretching the horizontal and vertical strain of sample as transverse and longitudinal coordinate
Angular coordinate system, fourth quadrant are stretch zones, and first quartile passes through plane strain limit point in stretch zones for bulging region
With ordinate drafting straight line at 45 °, in bulging region, by plane strain limit point and ordinate at 60 ° of drafting straight lines.
Beneficial effects of the present invention:
The quick testing auxiliary device of plate plane strain limit of the present invention, structure is simple, simple installation, is commonly drawing
Stretch the measurement that the plane strain limit can be completed on testing machine.
Shaping limit curve drawing drawing method of the present invention only utilizes the plane strain limit of above-mentioned auxiliary device measurement
Point, so
Bond material strain rule draws out the Forming Limit of Sheet Metals curve of the material afterwards, and work is greatly decreased compared with traditional scheme
It measures.
Detailed description of the invention
Fig. 1 is that plane strain of the present invention measures sample schematic diagram；
Fig. 2 is the quick testing auxiliary device schematic diagram of plate plane strain limit of the present invention；
Fig. 3 is the quick testing auxiliary device partial enlarged view of plate plane strain limit of the present invention；
Fig. 4 is that auxiliary device of the present invention accommodates sample schematic diagram；
Fig. 5 is shaping limit curve method for drafting schematic diagram.
Appended drawing reference:
1-plane strain measures sample holder area, and 2-plane strains measure sample holder area, 3-plane strains measurement examination
Sample strain regions, 4-plane strain auxiliary devices, 5-latch, 6-locking faces, 7-clamping screws, 8-crossbeams.
Specific embodiment
To be more easily understood objects, features and advantages of the present invention, below in conjunction with attached drawing to of the invention specific
Embodiment is described in detail.Based on the embodiments of the present invention, those skilled in the art are not before making creative work
Every other embodiment obtained is put, shall fall within the protection scope of the present invention.
The present invention provides a kind of quick testing auxiliary device of plate plane strain limit and test method, including plane strain
Sample 1, plane strain auxiliary device 4, plane strain limit test method, shaping limit curve drawing drawing method.
Plane strain sample 1, referring to Fig. 1, including plane strain sample holder area 2, plane strain sample strain regions 3.
Plane strain auxiliary device 4, referring to fig. 2, including auxiliary device latch 5, auxiliary device locking face 6, auxiliary dress
Set clamping screw 7, auxiliary device crossbeam 8.
Auxiliary device installation process: the plane strain sample is put into cupping machine tension test area vertically, stretches examination
Testing machine, collet clamps sample holder area 2 up and down.Auxiliary device 4 is horizontally installed among plane strain sample strain regions 3, is tightened auxiliary
Help device clamping screw 7, it is ensured that auxiliary device locking face 6 and auxiliary device latch 5 lock 3 water of plane strain sample strain regions
Flat both ends, as shown in Figure 3.According to plane strain specimen size and mechanical property, 4 quantity of auxiliary device can be increased, vertical
Direction is symmetrically arranged on plane strain sample strain regions 3, and mounting means is as above.
Plane strain limit test method: starting cupping machine, drawing plane strains 1 linear deformation of sample, due to auxiliary
The stiffness of device crossbeam 8 is helped to guarantee, 3 transverse strain of plane strain sample strain regions is zero, i.e. plane strain sample strain regions 2
Always it is in plane strain state, until there is necking, deflection near measurement necking down determines plane strain limiting value.
Shaping limit curve drawing drawing method: right angle seat is established as transverse and longitudinal coordinate to stretch the horizontal and vertical strain of sample
Mark system, fourth quadrant are stretch zones, and first quartile is bulging region, in stretch zones, by plane strain limit point and are indulged
Coordinate drafting straight line at 45 °, in bulging region, by plane strain limit point and ordinate at 60 ° of drafting straight lines.
The present embodiment directly can accurately test the plate plane strain limit using auxiliary device on common cupping machine
Point, bond material strain rule, only can a little draw out the Forming Limit of Sheet Metals curve of the material according to the plane strain limit,
Greatly reduce workload.
The quick testing auxiliary device of plate plane strain limit described in the present embodiment, structure is simple, simple installation, common
Cupping machine can be realized, and simplify test process.
Claims (3)
1. a kind of quick testing auxiliary device of plate plane strain limit, which is characterized in that the device is by latch (5), locking
Bolt (7) and crossbeam (8) composition, crossbeam (8) length is equal with width in the middle part of sheet coupon, and crossbeam (8) both ends are sample holder
Portion is equipped with latch (5) in sample holder portion, and sample holder portion is provided with threaded hole, and clamping screw (7) passes through threaded hole and lock
The screw connection of tight plate (5) setting.
2. the quick testing auxiliary device of plate plane strain limit according to claim 1, it is characterised in that sample holder
Screw thread the bore dia 10mm, two threaded hole centre distance 48mm~148mm in portion.
3. the test method of the quick testing auxiliary device of plate plane strain limit as described in claim 1, specific steps are such as
Under:
1) auxiliary device is transversely mounted on sample strain region and is locked before test,
2) in sample drawing process, remain that sample transverse strain is zero, until there is necking down, test stops, necking down area
The longitudinal strain principal strain in domain is the plane strain limit；
The installation number of auxiliary device when the plane strain limit test is 1,3 or 5 according to specimen length；
When the auxiliary device quantity is 1, it is mounted among sample, when auxiliary device quantity is 3 or 5, installation one among sample
A, remaining is symmetrically installed in sample strain region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910679297.1A CN110346212A (en) | 2019-07-25 | 2019-07-25 | A kind of quick testing auxiliary device of plate plane strain limit and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910679297.1A CN110346212A (en) | 2019-07-25 | 2019-07-25 | A kind of quick testing auxiliary device of plate plane strain limit and test method |
Publications (1)
| Publication Number | Publication Date |
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| CN110346212A true CN110346212A (en) | 2019-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910679297.1A Pending CN110346212A (en) | 2019-07-25 | 2019-07-25 | A kind of quick testing auxiliary device of plate plane strain limit and test method |
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Citations (15)
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|---|---|---|---|---|
| JPS60192238A (en) * | 1984-03-13 | 1985-09-30 | Toyota Motor Corp | Method for measuring deformation limit of plane strain |
| CN101294947A (en) * | 2008-05-30 | 2008-10-29 | 江苏大学 | Test device and method for acquiring limit strain of laser tailor welded plate plane with different thickness |
| CN202903574U (en) * | 2012-09-14 | 2013-04-24 | 郑州中原应用技术研究开发有限公司 | Test sample structure for fatigue test of sealant and fixture for fatigue test of sealant |
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| CN105241755A (en) * | 2015-10-20 | 2016-01-13 | 交通运输部公路科学研究所 | Road traffic marking material anti-crack property tester and use method thereof |
| CN106198179A (en) * | 2016-08-01 | 2016-12-07 | 湖南大学 | A kind of assay device measuring complex diversion systen lower thin sheet forming limit and method |
| CN205981868U (en) * | 2016-08-17 | 2017-02-22 | 上海新高桥凝诚建设工程检测有限公司 | Last tensile bonding with mobile device and electronic universal testing machine of concrete base plate |
| CN208223946U (en) * | 2018-05-08 | 2018-12-11 | 清远湘昌新材料有限公司 | A kind of new material device for testing tensile property |
| CN109187170A (en) * | 2018-11-14 | 2019-01-11 | 山东大学 | A kind of plane strain condition anchor plate limit pull-out test device and method |
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2019
- 2019-07-25 CN CN201910679297.1A patent/CN110346212A/en active Pending
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|---|---|---|---|---|
| JPS60192238A (en) * | 1984-03-13 | 1985-09-30 | Toyota Motor Corp | Method for measuring deformation limit of plane strain |
| CN101294947A (en) * | 2008-05-30 | 2008-10-29 | 江苏大学 | Test device and method for acquiring limit strain of laser tailor welded plate plane with different thickness |
| CN202903574U (en) * | 2012-09-14 | 2013-04-24 | 郑州中原应用技术研究开发有限公司 | Test sample structure for fatigue test of sealant and fixture for fatigue test of sealant |
| CN203069457U (en) * | 2013-03-09 | 2013-07-17 | 东北石油大学 | Material mechanical property testing device under complex stress state |
| CN103969134A (en) * | 2013-12-18 | 2014-08-06 | 西安交通大学 | Vision measurement device of sheet forming limit curve |
| CN203772644U (en) * | 2014-03-07 | 2014-08-13 | 中国第一汽车股份有限公司 | Connecting rod rigidity testing device |
| CN204064789U (en) * | 2014-08-18 | 2014-12-31 | 武汉钢铁(集团)公司 | A kind of back-and-forth bending test machine and bend arm thereof |
| CN204255762U (en) * | 2014-09-26 | 2015-04-08 | 重庆大学 | A kind of For The Forming Limit of Sheet Metals figure proving installation |
| CN104359767A (en) * | 2014-10-18 | 2015-02-18 | 吉林大学 | High-temperature biaxial tension device |
| CN105241755A (en) * | 2015-10-20 | 2016-01-13 | 交通运输部公路科学研究所 | Road traffic marking material anti-crack property tester and use method thereof |
| CN106198179A (en) * | 2016-08-01 | 2016-12-07 | 湖南大学 | A kind of assay device measuring complex diversion systen lower thin sheet forming limit and method |
| CN205981868U (en) * | 2016-08-17 | 2017-02-22 | 上海新高桥凝诚建设工程检测有限公司 | Last tensile bonding with mobile device and electronic universal testing machine of concrete base plate |
| CN208223946U (en) * | 2018-05-08 | 2018-12-11 | 清远湘昌新材料有限公司 | A kind of new material device for testing tensile property |
| CN109187170A (en) * | 2018-11-14 | 2019-01-11 | 山东大学 | A kind of plane strain condition anchor plate limit pull-out test device and method |
| CN109580384A (en) * | 2019-01-24 | 2019-04-05 | 中汽研（天津）汽车工程研究院有限公司 | A kind of side door beams three-point bend test device |
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Application publication date: 20191018 |
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