CN104677706B - Preparation method of variable-thickness plate sectional area unilateral tensile experiment sample - Google Patents
Preparation method of variable-thickness plate sectional area unilateral tensile experiment sample Download PDFInfo
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- CN104677706B CN104677706B CN201510067636.2A CN201510067636A CN104677706B CN 104677706 B CN104677706 B CN 104677706B CN 201510067636 A CN201510067636 A CN 201510067636A CN 104677706 B CN104677706 B CN 104677706B
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Abstract
The invention discloses a preparation method of a variable-thickness plate sectional area unilateral tensile experiment sample. The method comprises the following steps: step one, measuring thickness distribution, including the thickness at a thick area, the thickness at a thin area and the thickness at a transition area, of a whole variable-thickness plate; step two, referring to the preparation standard of a constant-thickness plate unilateral tensile experiment sample, designing the clamping area length, the clamping area width and a transition fillet radius from the clamping area to a first parallel section (1) of the variable-thickness plate unilateral tensile experiment sample; step three, selecting the width of the first parallel section (1) at the thick area; and step four, computing the corresponding section area after selecting the width of the first parallel section (1) at the thick area, namely, multiplying the width of the first parallel section (1) at the thick area with the corresponding thickness. Through the method, the sample can be deformed in the transition area as much as possible to achieve the aim of accurately determining the transition area material mechanical property; and the sample prepared by using the method is low in cost and high in pass percent.
Description
Technical field
The invention belongs to continuous thickening plate (Variable Thickness Rolled Blanks, VRB) transition region material
Performance test field is and in particular to a kind of thickening plate uiform section amasss the preparation method of one directional tensile test sample.
Background technology
In traditional material property testing, mainly include simple tension, Uniaxial Compression, biaxial tensile test, in contrast
The stress field answered is unidirectional pulling force, uniaxial pressure, two-way tension respectively.One directional tensile test can be with research material in different stress
Reaction under state, no matter the scientific research for full appreciation material property or guiding material mechanics is relatively attached most importance to applying all to have
The meaning wanted.
With the increase of China's automobile pollution, Vehicle Materials are consequently increased, most in contemporary automotive material
It is steel plate.Traditional automobile-used sheet material is uniform thickness because its have the advantages that more, for example：Processing technology is ripe, prepares phase
To relatively simple etc., on the other hand, slab is waited also to have the shortcomings that more prominent, especially in the concept proposing automotive light weight technology
Afterwards, requiring although waiting slab can meet intensity and toughness etc., being difficult to realize light-weighted purpose.Send out with scientific and technical
Exhibition, new sheet processes continuously emerge, and in recent years, laser assembly solder plate, continuous thickening plate occur in succession, and such sheet material was both
The requirement of automotive light weight technology can be met it is also possible to meet the requirement to timber intensity and rigidity for the automobile.But problem is also following,
For waiting slab, the sample of slab one directional tensile test is waited to have corresponding GB《GB/T_228-2010_ metal material
Material _ tension test _ room temperature test method》.In GB, the size for sample gives description in considerable detail.And for
Thickening plate, because it has a transition region, so the preparation of simple tension sample is different from waits the examination of slab one directional tensile test
The preparation of sample, but also do not have corresponding standard to instruct the preparation of thickening plate one directional tensile test sample.
For the preparation of thickening plate one directional tensile test sample, a lot of scholars have been made substantial amounts of research, such as Zhang Hua
Big《Rolling difference slab forming property research》, Li Yanhua《The geometric parameter research of impact TRB simple tension》.But the sample made
Its deformation still can not focus on transition region, and in tension test firm start time, the deformation of sample just concentrates on thin area, therefore right
There is very big obstruction in the material property obtaining transition region, to sum up, need a kind of thickening plate one directional tensile test sample system of proposition badly
Standby new method, solves the problems, such as existing thickening plate one directional tensile test sample so as to deformation concentrates on transition region as far as possible,
So advantageously in the material property obtaining transition region.
Content of the invention
The present invention is directed to the deficiency that existing thickening plate one directional tensile test sample exists, and proposes a kind of transition region uiform section and amasss
The preparation method of sample.
For solving above-mentioned technical problem, the present invention employs the following technical solutions：A kind of thickening plate uiform section amasss simple tension
The preparation method of test sample, specifically includes following steps：
Step 1, monoblock thickening plate thickness distribution is measured, thick including thick area thickness, thin area thickness and transition region
Degree；
The preparation standard of the slab one directional tensile test sample such as step 2, reference, that is,《GB/T_228-2010 metal material draws
Stretch test room temperature test method》The clamping section length of design thickening plate one directional tensile test sample, clamping sector width and clamping
Area is to the radius of the first parallel-segment；
Step 3, the width of first parallel-segment in selected thickness area；
After step 4, the first parallel-segment width in selected thickness area, calculate corresponding sectional area, that is,：Gauge length width is changed to
The first parallel-segment width in thick area is multiplied by corresponding thickness；
Step 5, determine corresponding sectional area in step 4 after, obtained divided by the thickness in the thin area of opposite side with sectional area
The width of first parallel-segment in the corresponding thin area of opposite side；
Width according to equal the first parallel-segment calculating the thin area of opposite side of sectional area；
Step 6, the width of second parallel-segment in selected thickness area；
After step 7, the second parallel-segment width in selected thickness area, calculate corresponding sectional area, that is,：Second parallel-segment 2
Width is multiplied by corresponding thickness；
Step 8, determine corresponding sectional area in step 7 after, obtained divided by the thin area thickness of opposite side with sectional area
The width of second parallel-segment in the corresponding thin area of opposite side；
Step 9, the size being determined according to above step, determine that width of transition zone continually varying uiform section amasss thickening plate list
To the appearance and size that tensile sample is overall.
Further present invention also offers a kind of thickening plate uiform section amasss the preparation method of one directional tensile test sample, its
Specifically include following steps：
Step 1, monoblock thickening plate thickness distribution is measured, thick including thick area thickness, thin area thickness and transition region
Degree；
The preparation standard of the slab one directional tensile test sample such as step 2, reference, that is,《GB/T_228-2010 metal material draws
Stretch test room temperature test method》The clamping section length of design thickening plate one directional tensile test sample, clamping sector width and clamping
Area is to the radius of the first parallel-segment；
Step 3, the width of first parallel-segment in selected thin area,
After step 4, the width of the first parallel-segment in selected thin area, calculate corresponding sectional area, that is,：The first of thin area is flat
The width of row section is multiplied by corresponding thickness；
Step 5, determine sectional area in step 4 after, obtained accordingly divided by the thick area thickness of opposite side with sectional area
The width of first parallel-segment in opposite side thickness area；
Step 6, the width of second parallel-segment in selected thin area；
After step 7, the second parallel-segment width in selected thin area, calculate corresponding sectional area, that is,：The second of thin area is flat
Row section 2 width is multiplied by corresponding thickness；
Step 8, determine corresponding sectional area in step 7 after, with sectional area divided by opposite side thickness area thickness obtain
The width of second parallel-segment in corresponding opposite side thickness area；
Step 9, the size being determined according to above step, determine that transition region gauge length continually varying uiform section thickening plate is unidirectional
The overall appearance and size of tensile sample.
The beneficial effects of the present invention is：When doing one directional tensile test, sample can be tried one's best and be become in transition region
Shape, with reach can more Accurate Determining transition region material mechanical performance purpose, the sample cost of the method preparation simultaneously is low,
Qualification rate is high, is tested using this sample, drastically increases success of the test rate and the efficiency of test.
Brief description
Fig. 1 thickening plate schematic diagram；
Fig. 2 thickening thickness of slab area, thin area and transition region thickness measure figure；
The each area schematic of Fig. 3 sample；
Fig. 4 thickening plate uiform section one directional tensile test sample physical dimension figure；
Fig. 5 uiform section amasss the stress-plastic strain figure of point in sample transition region；
Stress-plastic strain the figure of point in Fig. 6 general sample transition region.
Specific embodiment
Below with reference to Figure of description 1-6 and specific embodiment, the present invention is elaborated.
The invention provides a kind of thickening plate uiform section amass one directional tensile test sample preparation method, its specifically include with
Lower step：
Step 1, monoblock thickening plate thickness distribution is measured：Thick area thickness, thin area thickness and transition region thickness, should
The thickening plate plate overall dimensions used in embodiment are 1000*400mm.
It is illustrated in figure 1 monoblock thickening plate, it includes Hou Qu, thin area and transition region.To monoblock thickening plate in this step
The thickness distribution that plate will intercept sample measures, and the survey tool used is calliper, for ensureing the accuracy of measurement data,
In Bao Qu, thick area and transition region all using multimetering, then the method averaged.
As shown in Figure 2：5 are equidistantly taken respectively along rolling direction and vertical rolling direction when measurement Hou Qu and thin area's thickness
Point, distance between two points is 5mm, measures the thickness value at each point, equidistantly takes 5 respectively on both sides during measurement transition region thickness
Point, distance between two points is 5mm, measure each point thickness value measure after carry out data processing, finally give thickening thickness of slab area thickness
Degree is：13 points in thick area are averaged as 1.85mm, and thin area 13, thickness Ji Bao area point is averaged as 1.1mm, and transition region is thick
Transition region thickness distribution such as following table that each corresponding upper and lower two point of degree numbering 1,2,3,4,5 are averaging is (from thick area successively to thin
Area)：
The preparation standard of the slab one directional tensile test sample such as step 2, reference, that is,《GB/T_228-2010_ metal material _
Tension test _ room temperature test method》The clamping section length of design thickening plate one directional tensile test sample, clamping sector width, clamping
Area is to the radius of the first parallel-segment 1；
In this step, the preparation standard of the slab one directional tensile test sample such as reference is designed calculating, and waits slab unidirectional
Tensile test piece standard is《GB/T_228-2010_ metal material _ tension test _ room temperature test method》Wherein B.1 table is given
Rectangular cross section proportional test bar size, B.2 table gives rectangular cross section proportional test bar size.The sample being given with reference to these
Size, determines the clamping section length of thickening plate one directional tensile test sample, the knuckle half of clamp area to the first parallel-segment 1
Footpath；
Wherein：Sample in the present invention comprises two class parallel-segment, here for convenience of description, they is designated as respectively
One parallel-segment 1, the second parallel-segment 2, as shown in Figure 3：First parallel-segment 1 represents the parallel zone that two ends are joined directly together with knuckle
Domain, the second parallel-segment 2 represents the parallel zone that two ends are joined directly together with transition region.As shown in figure 3, being embodied as in the present invention
In example, two ends clamping sector width is 30mm, and clamping section length is 35mm, and clamp area is to the radius of the first parallel-segment 1
For 25mm, the radius of first parallel-segment the 1 to the second parallel-segment 2 are 8mm；Its corresponding position such as in figure black wire frame
Shown.
The preparation standard of the slab one directional tensile test sample such as step 3, reference, selectes the width of first parallel-segment 1 in thin area
Degree；
The width first selecting first parallel-segment 1 in thin area in the present embodiment is 13.46mm,
After step 4, the width of the first parallel-segment 1 in selected thin area, calculate corresponding sectional area, that is,：The first of thin area
The width of parallel-segment 1 is multiplied by corresponding thickness；
The width of first parallel-segment 1 in step 3 Zhong Bao area is 13.46mm, and therefore corresponding area is 13.46*1.1=
14.806mm2,
Step 5, determine sectional area in step 4 after, obtained accordingly divided by the thick area thickness of opposite side with sectional area
The width of first parallel-segment 1 in opposite side thickness area；
Step 3 middle section is amassed as 14.806mm2, the width of first parallel-segment 1 in the thick area of therefore corresponding opposite side
For 14.806/1.85=8.0032mm, take 8mm.
The preparation standard of the slab one directional tensile test sample such as step 6, reference selectes the width of second parallel-segment 2 in thin area
Degree；
First determine the width of second parallel-segment 2 in thin area in the present embodiment, wait slab one directional tensile test sample standard
《GB/T_228-2010_ metal material _ tension test _ room temperature test method》In have a series of gauge length width datas, due to this reality
Apply the sample criteria of right and wrong in example, therefore according to pertinent literature and experience, select second parallel-segment 2 in thin area in the present embodiment
Width is 12.5mm.
After step 7, the second parallel-segment 2 width in selected thin area, calculate corresponding sectional area, that is,：The second of thin area
Parallel-segment 2 width is multiplied by corresponding thickness；
Having recorded thin area thickness in step 1 is 1.1mm, also determines the second parallel-segment 2 width in thin area in step 4
For 12.5mm it is possible to show that sectional area is 1.1*12.5=13.75mm2.
Step 8, determine corresponding sectional area in step 7 after, with this sectional area divided by opposite side thickness area thickness just
The width of second parallel-segment 2 in opposite side thickness area can be obtained；
The sectional area being calculated Liao Bao area in step 7 is 13.75mm2, the thickness also recording Liao Hou area in step 1 is
1.85mm, so the width of second parallel-segment 2 in thick area is 13.75/1.85=7.4324mm, retaining two-decimal is
7.43mm.
Step 9, by each dimension synthesis achieved above, can access transition region gauge length continually varying uiform section become
The overall appearance and size of slab simple tension sample；
As shown in Figure 4：Two ends clamping sector width is 30mm, and clamping section length is 35mm, the transition of clamp area to parallel zone
Radius of corner is 25mm, and the first parallel-segment 1 width in Bao Qu and thick area is respectively 13.46mm and 8mm, Bao Qu and the second of thick area
Parallel-segment 2 width is respectively 12.5mm and 7.43mm.
It is to be noted that being not directed to the first parallel-segment 1 and the specific length dimension of the second parallel-segment 2 in above-mentioned design, this
It is because that the length of this two classes parallel-segment is less to sample influential effect finally to be reached, the parallel segment length of two classes can respectively account for
Overall size cuts clamp area, knuckle, the half after the small round corner size of second parallel-segment the 2 to the first parallel-segment 1.
The thickening plate sample processed by above-mentioned design size and standard size sample are carried out with tension test, two kinds of samples
The position of final fracture is almost consistent.But they each in transition region the deformation of the essentially identical point in position be different
, as shown in Figure 5,6：The plastic deformation of transition region each point is all improved than the plastic deformation of each point in Fig. 6 in Figure 5.This says
Bright uiform section amasss simple tension sample, and than thickening plate, deformation in transition region for the general sample is uniform.
The typically unidirectional sample tensile test simulation result of thickening plate and uiform section amass one directional tensile test simulation result and show,
For the general sample for thickening plate, when stretching emulation just starts, deformation just concentrates on the thin area of thickening plate, so obtains
Material property can only characterize the material property in thin area, rather than the material property of transition region, amasss for sample for uiform section, its
Deformation concentrates on transition region, just can produce concentration when producing large strain.Therefore compared with general thickening plate sample,
Sample can preferably measure the material property of transition region made in accordance with the present invention.In addition, the result of emulation obtains with test
Result be also more to coincide.
During specimen test, if last fracture remains focuses on one end, like this can not preferably really
The curve of fixed stretching is the curve of which position, can continue to change the size of sample each several part for solving this problem, so
Improve the present invention further.Till fracture position is located at the fracture position that transition region centre position or experimenter want.
Claims (2)
1. a kind of thickening plate uiform section amasss the preparation method of one directional tensile test sample, and it specifically includes following steps：
Step 1, monoblock thickening plate thickness distribution is measured, including thickness thickness area of thick area thickness, thin area thickness and transition
Area's thickness；
The preparation standard of the slab one directional tensile test sample such as step 2, reference, that is,《GB/T_228-2010 material during tensile tries
Test room temperature test method》The clamping section length of design thickening plate one directional tensile test sample, clamping sector width and clamp area are arrived
The radius of the first parallel-segment (1)；
Step 3, the width of first parallel-segment (1) in selected thickness area；
After step 4, the first parallel-segment (1) width in selected thickness area, calculate corresponding sectional area, that is,：By the of thick area
One parallel-segment (1) width is multiplied by corresponding thickness；
Step 5, determine corresponding sectional area in step 4 after, obtained accordingly divided by the thickness in the thin area of opposite side with sectional area
First parallel-segment (1) in the thin area of opposite side width；
Step 6, the width of second parallel-segment (2) in selected thickness area；
After step 7, the second parallel-segment (2) width in selected thickness area, calculate corresponding sectional area, that is,：Second parallel-segment (2)
Width is multiplied by corresponding thickness；
Step 8, determine corresponding sectional area in step 7 after, obtained accordingly divided by the thin area thickness of opposite side with sectional area
Second parallel-segment (2) in the thin area of opposite side width；
Step 9, the size being determined according to above step, determine that width of transition zone continually varying uiform section amasss that thickening plate is unidirectional draws
Stretch the overall appearance and size of sample.
2. a kind of thickening plate uiform section amasss the preparation method of one directional tensile test sample, and it specifically includes following steps：
Step 1, monoblock thickening plate thickness distribution is measured, including thick area thickness, thin area thickness and transition region thickness；
The preparation standard of the slab one directional tensile test sample such as step 2, reference, that is,《GB/T_228-2010 material during tensile tries
Test room temperature test method》The clamping section length of design thickening plate one directional tensile test sample, clamping sector width and clamp area are arrived
The radius of the first parallel-segment (1)；
Step 3, the width of first parallel-segment (1) in selected thin area,
After step 4, the width of the first parallel-segment (1) in selected thin area, calculate corresponding sectional area, that is,：The first of thin area is flat
The width of row section (1) is multiplied by corresponding thickness；
Step 5, determine sectional area in step 4 after, with sectional area divided by opposite side thick area thickness obtain another accordingly
The width of first parallel-segment (1) in Ce Hou area；
Step 6, the width of second parallel-segment (2) in selected thin area；
After step 7, the second parallel-segment (2) width in selected thin area, calculate corresponding sectional area, that is,：The second of thin area is flat
Row section (2) width is multiplied by corresponding thickness；
Step 8, determine corresponding sectional area in step 7 after, with sectional area divided by opposite side thickness area thickness obtain accordingly
Opposite side thickness area the second parallel-segment (2) width；
Step 9, the size being determined according to above step, determine transition region gauge length continually varying uiform section thickening plate simple tension
The overall appearance and size of sample.
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| CN107478475B (en) * | 2017-07-25 | 2019-11-08 | 东北大学 | A kind of design method of the simple tension sample of the poor thick plate mechanics behavior of characterization rolling |
| JP7328495B2 (en) * | 2018-03-29 | 2023-08-17 | 日本製鉄株式会社 | Specimen and stress corrosion cracking test method |
| CN110553917B (en) * | 2019-09-11 | 2022-03-18 | 北京东方雨虹防水技术股份有限公司 | Test system and test method for multidirectional stretching of waterproof material |
| CN111060365B (en) * | 2019-11-21 | 2022-08-30 | 华菱安赛乐米塔尔汽车板有限公司 | Tensile sample system for detecting baking hardening value |
| CN112692147B (en) * | 2020-12-07 | 2022-12-02 | 广东石油化工学院 | Intelligent drawing control system and method for rolled differential-thickness plate box-shaped piece |
| CN112908434B (en) * | 2021-01-25 | 2022-11-18 | 安徽工业大学 | Design method of trapezoidal plate capable of being made into standard tensile sample after rolling deformation |
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| US5259174A (en) * | 1990-10-11 | 1993-11-09 | Aerospatiale Societe Nationale Industrielle | Jaw for traction tests on test piece slivers without heels |
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