CN104677706A - 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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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) zone of transition material properties test field, be specifically related to the preparation method that a kind of thickening plate uniform cross section amasss one directional tensile test sample.
Background technology
In traditional material property testing, mainly comprise unilateral stretching, Uniaxial Compression, biaxial tensile test, the stress field corresponded is unidirectional pulling force, uniaxial pressure, two-way tension respectively.One directional tensile test can the reaction of research material under different stress, no matter all have the meaning of outbalance for full appreciation material property or the scientific research of guiding material mechanics with application.
Along with the increase of China's automobile pollution, Vehicle Materials also increases thereupon, and maximum in contemporary automotive material are steel plates.Traditional automobile-used sheet material is uniform thickness, because it has more advantage, such as: processing technology is ripe, prepare comparatively simple etc., on the other hand, slab is waited also to have comparatively outstanding shortcoming, especially after the concept proposing automotive light weight technology, although the requirements such as intensity and toughness can be met Deng slab, be difficult to realize light-weighted object.Along with the development of science and technology, new sheet processes constantly occurs, in recent years, laser assembly solder plate, continuously thickening plate occur in succession, and such sheet material can meet the requirement of automotive light weight technology, also can meet the requirement of automobile to timber intensity and rigidity.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 _ tension test _ room temperature test method ".In GB, the size for sample gives quite detailed description.And for thickening plate, because it exists a zone of transition, so the preparation of unilateral stretching sample such as to be different from the preparation of slab one directional tensile test sample, there is no corresponding standard also 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 scholar has made large quantifier elimination, as Zhang Huawei " research of rolling difference slab forming property ", and Li Yanhua " affecting the geometric parameter research of TRB unilateral stretching ".But its distortion of the sample made still can not focus on zone of transition, in tension test firm start time, the distortion of sample just concentrates on thin district, therefore very large obstruction is had for the material property obtaining zone of transition, to sum up, need the new method proposing a kind of thickening plate one directional tensile test sample and prepare badly, solve existing thickening plate one directional tensile test sample Problems existing, make it be out of shape and concentrate on zone of transition as far as possible, so advantageously in the material property obtaining zone of transition.
Summary of the invention
The present invention is directed to the deficiency that existing thickening plate one directional tensile test sample exists, propose the preparation method that a kind of zone of transition uniform cross section amasss sample.
For solving the problems of the technologies described above, the present invention by the following technical solutions: a kind of thickening plate uniform cross section amasss the preparation method of one directional tensile test sample, specifically comprises the following steps:
Step 1, monoblock thickening plate thickness distribution to be measured, comprise thick district thickness, thin district thickness and zone of transition thickness;
The preparation standard of the slab such as step 2, reference one directional tensile test sample, namely " GB/T_228-2010 metal material stretching test room temperature test method " designs the clamp area length of thickening plate one directional tensile test sample, clamp area width and the clamp area radius to the first parallel-segment;
The width of first parallel-segment in step 3, selected thick district;
After the first parallel-segment width in step 4, selected thick district, calculate corresponding sectional area, that is: the first parallel-segment width that gauge length width is changed to thick district is multiplied by corresponding thickness;
Step 5, determine corresponding sectional area in step 4 after, obtain the width of first parallel-segment in the thin district of corresponding opposite side divided by the thickness in the thin district of opposite side with sectional area;
According to the equal width calculating first parallel-segment in the thin district of opposite side of sectional area;
The width of second parallel-segment in step 6, selected thick district;
After the second parallel-segment width in step 7, selected thick district, calculate corresponding sectional area, that is: the second parallel-segment 2 width is multiplied by corresponding thickness;
Step 8, determine corresponding sectional area in step 7 after, obtain the width of second parallel-segment in the thin district of corresponding opposite side divided by the thin district thickness of opposite side with sectional area;
Step 9, the size determined according to above step, determine that width of transition zone continually varying uniform cross section amasss the physical dimension of thickening plate unilateral stretching sample entirety.
Present invention also offers the preparation method that a kind of thickening plate uniform cross section amasss one directional tensile test sample further, it specifically comprises the following steps:
Step 1, monoblock thickening plate thickness distribution to be measured, comprise thick district thickness, thin district thickness and zone of transition thickness;
The preparation standard of the slab such as step 2, reference one directional tensile test sample, namely " GB/T_228-2010 metal material stretching test room temperature test method " designs the clamp area length of thickening plate one directional tensile test sample, clamp area width and the clamp area radius to the first parallel-segment;
The width of first parallel-segment in step 3, selected thin district,
After the width of first parallel-segment in step 4, selected thin district, calculate corresponding sectional area, that is: the width of first parallel-segment in thin district is multiplied by corresponding thickness;
Step 5, determine sectional area in step 4 after, obtain the width of first parallel-segment in the thick district of corresponding opposite side divided by the thick district thickness of opposite side with sectional area;
The width of second parallel-segment in step 6, selected thin district;
After the second parallel-segment width in step 7, selected thin district, calculate corresponding sectional area, that is: second parallel-segment 2 width in thin district is multiplied by corresponding thickness;
Step 8, determine corresponding sectional area in step 7 after, obtain the width of second parallel-segment in the thick district of corresponding opposite side divided by the thickness in the thick district of opposite side with sectional area;
Step 9, the size determined according to above step, determine the physical dimension of zone of transition gauge length continually varying uniform cross section thickening plate unilateral stretching sample entirety.
Beneficial effect of the present invention is: when doing one directional tensile test, sample can deform as far as possible in zone of transition, can the object of comparatively Accurate Determining zone of transition material mechanical performance to reach, simultaneously the sample cost prepared of the method is low, qualification rate is high, utilize this sample to test, drastically increase the efficiency of success of the test rate and test.
Accompanying drawing explanation
Fig. 1 thickening plate schematic diagram;
Fig. 2 thickening thickness of slab district, thin district and zone of transition thickness measure figure;
The each area schematic of Fig. 3 sample;
Fig. 4 thickening plate uniform cross section one directional tensile test sample physical dimension figure;
Fig. 5 uniform cross section amasss stress-plastic strain figure that sample zone of transition is put;
Stress-plastic strain figure that the general sample zone of transition of Fig. 6 is put.
Embodiment
Below with reference to Figure of description 1-6 and specific embodiment, the present invention is elaborated.
The invention provides the preparation method that a kind of thickening plate uniform cross section amasss one directional tensile test sample, it specifically comprises the following steps:
Step 1, monoblock thickening plate thickness distribution to be measured: thick district thickness, thin district thickness and zone of transition thickness, the thickening plate plate overall dimensions used in this embodiment is 1000*400mm.
Be illustrated in figure 1 monoblock thickening plate, it comprises Hou Qu, thin district and zone of transition.Measure the thickness distribution that monoblock thickening plate plate will intercept sample in this step, the survey instrument used is calliper, is the accuracy ensureing measurement data, all adopts multimetering in Bao Qu, thick district and zone of transition, then the method for averaging.
As shown in Figure 2: measure Hou Qu and equidistantly get 5 points with during thin district's thickness respectively along rolling direction and vertical rolling direction, distance between two points is 5mm, measure the one-tenth-value thickness 1/10 at each some place, 5 points are equidistantly got respectively on both sides when measuring zone of transition thickness, distance between two points is 5mm, the one-tenth-value thickness 1/10 measuring each point measures laggard row data processing, finally obtain thickening thickness of slab district thickness namely: 13, thick district point is averaged as 1.85mm, thin district 13, thickness Ji Bao district point is averaged as 1.1mm, zone of transition thickness numbering 1, 2, 3, 4, the zone of transition thickness distribution that upper and lower two points of 5 each correspondences are averaging is as following table (from thick district successively to thin district):
The preparation standard of the slab such as step 2, reference one directional tensile test sample, namely " GB/T_228-2010_ metal material _ tension test _ room temperature test method " designs the clamp area length of thickening plate one directional tensile test sample, clamp area width, clamp area to the radius of the first parallel-segment 1;
In this step, reference waits the preparation standard of slab one directional tensile test sample to carry out designing and calculating, be that " GB/T_228-2010_ metal material _ tension test _ room temperature test method " is wherein shown B.1 to give rectangular cross section proportional test bar size Deng slab one directional tensile test sample standard, B.2 table gives rectangular cross section proportional test bar size.With reference to the specimen size that these provide, determine that the clamp area length of thickening plate one directional tensile test sample, clamp area are to the radius of the first parallel-segment 1;
Wherein: the sample in the present invention comprises two class parallel-segment, here for convenience of description, they are designated as respectively the first parallel-segment 1, second parallel-segment 2, as shown in Figure 3: the first parallel-segment 1 represents the parallel zone that two ends are directly connected with knuckle, the second parallel-segment 2 represents the parallel zone that two ends are directly connected with zone of transition.As shown in Figure 3, in a particular embodiment of the present invention, clamp area, two ends width is 30mm, and clamp area length is 35mm, and clamp area is 25mm to the radius of the first parallel-segment 1, and the radius of the first parallel-segment 1 to the second parallel-segment 2 is 8mm; Its corresponding position is as shown in black wire frame in figure.
The preparation standard of the slab such as step 3, reference one directional tensile test sample, the width of first parallel-segment 1 in selected thin district;
In the present embodiment, first the width of first parallel-segment 1 in selected thin district is 13.46mm,
After the width of first parallel-segment 1 in step 4, selected thin district, calculate corresponding sectional area, that is: the width of first parallel-segment 1 in thin district is multiplied by corresponding thickness;
The width of first parallel-segment 1 in step 3 Zhong Bao district is 13.46mm, and therefore corresponding area is 13.46*1.1=14.806mm
2,
Step 5, determine sectional area in step 4 after, obtain the width of first parallel-segment 1 in the thick district of corresponding opposite side divided by the thick district thickness of opposite side with sectional area;
Step 3 middle section is amassed as 14.806mm
2, the width of first parallel-segment 1 in the thick district of therefore corresponding opposite side is 14.806/1.85=8.0032mm, gets 8mm.
The preparation standard of the slab such as step 6, reference one directional tensile test sample selectes the width of second parallel-segment 2 in thin district;
The width of second parallel-segment 2 in thin district is first determined in the present embodiment, Deng there being a series of gauge length width data in slab one directional tensile test sample standard " GB/T_228-2010_ metal material _ tension test _ room temperature test method ", due to the sample criteria of right and wrong in the present embodiment, therefore according to pertinent literature and experience, the width selecting second parallel-segment 2 in thin district is in the present embodiment 12.5mm.
After second parallel-segment 2 width in step 7, selected thin district, calculate corresponding sectional area, that is: second parallel-segment 2 width in thin district is multiplied by corresponding thickness;
Having recorded thin district thickness is in step 1 1.1mm, and the second parallel-segment 2 width also determining thin district in step 4 is 12.5mm, so can show that sectional area is 1.1*12.5=13.75mm
2.
Step 8, determine corresponding sectional area in step 7 after, just can obtain the width of second parallel-segment 2 in the thick district of opposite side divided by the thickness in the thick district of opposite side with this sectional area;
Calculating the sectional area obtaining thin district in step 7 is 13.75mm
2, the thickness also recording Liao Hou district is in step 1 1.85mm, so the width of second parallel-segment 2 in thick district is 13.75/1.85=7.4324mm, reservation two-decimal is 7.43mm.
Step 9, each dimension synthesis that will obtain above, can access the physical dimension of zone of transition gauge length continually varying uniform cross section thickening plate unilateral stretching sample entirety;
As shown in Figure 4: clamp area, two ends width is 30mm, clamp area length is 35mm, clamp area is 25mm to the radius of parallel zone, first parallel-segment 1 width in Bao Qu and thick district is respectively 13.46mm and 8mm, and second parallel-segment 2 width in Bao Qu and thick district is respectively 12.5mm and 7.43mm.
It is to be noted and not relate to the first parallel-segment 1 and the concrete length dimension of the second parallel-segment 2 in above-mentioned design, this is because the influential effect that the length of this two classes parallel-segment finally will reach sample is less, two class parallel-segment length can respectively account for overall dimensions cut the small round corner size of clamp area, knuckle, the second parallel-segment 2 to the first parallel-segment 1 after half.
Carry out tension test to the thickening plate sample processed by above-mentioned design size and standard size sample, the alternate position spike of two kinds of sample final fractures is seldom consistent.But they separately in zone of transition the distortion of the point that position is substantially identical be different, as shown in Figure 5,6: the plastic yield of zone of transition each point is all improved than the plastic yield of each point in Fig. 6 in Figure 5.It is more even than the distortion of the general sample of thickening plate in zone of transition that this illustrates that uniform cross section amasss unilateral stretching sample.
The general unidirectional sample tensile test simulation result of thickening plate and uniform cross section amass one directional tensile test simulation result and show, for the general sample of thickening plate, when the emulation that stretches just starts, distortion just concentrates on the thin district of thickening plate, the material property obtained like this can only characterize the material property in thin district, instead of the material property of zone of transition, amasss sample for uniform cross section, its distortion concentrates on zone of transition, until produce comparatively large sstrain time just can produce concentrated.Therefore, compared with general thickening plate sample, sample better can measure the material property of zone of transition made in accordance with the present invention.In addition, the result of emulation is also comparatively coincide with testing the result obtained.
In specimen test process, if last fracture remains focus on one end, like this can not determining that the curve stretched is the curve of which position preferably, for addressing this problem the size that can continue to change sample each several part, improving the present invention so further.Till fracture position is positioned at the fracture position that zone of transition centre position or experimenter want.
Claims (2)
1. thickening plate uniform cross section amasss a preparation method for one directional tensile test sample, and it specifically comprises the following steps:
Step 1, monoblock thickening plate thickness distribution to be measured, comprise thickness thick district of thick district thickness, thin district thickness and zone of transition thickness;
The preparation standard of the slab such as step 2, reference one directional tensile test sample, namely " GB/T_228-2010 metal material stretching test room temperature test method " designs the clamp area length of thickening plate one directional tensile test sample, clamp area width and the clamp area radius to the first parallel-segment (1);
The width of first parallel-segment (1) in step 3, selected thick district;
After first parallel-segment (1) width in step 4, selected thick district, calculate corresponding sectional area, that is: be multiplied by corresponding thickness by the first parallel-segment (1) width in thick district;
Step 5, determine corresponding sectional area in step 4 after, obtain the width of first parallel-segment (1) in the thin district of corresponding opposite side divided by the thickness in the thin district of opposite side with sectional area;
The width of second parallel-segment (2) in step 6, selected thick district;
After second parallel-segment (2) width in step 7, selected thick district, calculate corresponding sectional area, that is: the second parallel-segment (2) width is multiplied by corresponding thickness;
Step 8, determine corresponding sectional area in step 7 after, obtain the width of second parallel-segment (2) in the thin district of corresponding opposite side divided by the thin district thickness of opposite side with sectional area;
Step 9, the size determined according to above step, determine that width of transition zone continually varying uniform cross section amasss the physical dimension of thickening plate unilateral stretching sample entirety.
2. thickening plate uniform cross section amasss a preparation method for one directional tensile test sample, and it specifically comprises the following steps:
Step 1, monoblock thickening plate thickness distribution to be measured, comprise thick district thickness, thin district thickness and zone of transition thickness;
The preparation standard of the slab such as step 2, reference one directional tensile test sample, namely " GB/T_228-2010 metal material stretching test room temperature test method " designs the clamp area length of thickening plate one directional tensile test sample, clamp area width and the clamp area radius to the first parallel-segment (1);
The width of first parallel-segment (1) in step 3, selected thin district,
After the width of first parallel-segment (1) in step 4, selected thin district, calculate corresponding sectional area, that is: the width of first parallel-segment (1) in thin district is multiplied by corresponding thickness;
Step 5, determine sectional area in step 4 after, obtain the width of first parallel-segment (1) in the thick district of corresponding opposite side divided by the thick district thickness of opposite side with sectional area;
The width of second parallel-segment (2) in step 6, selected thin district;
After second parallel-segment (2) width in step 7, selected thin district, calculate corresponding sectional area, that is: the second parallel-segment (2) width in thin district is multiplied by corresponding thickness;
Step 8, determine corresponding sectional area in step 7 after, obtain the width of second parallel-segment (2) in the thick district of corresponding opposite side divided by the thickness in the thick district of opposite side with sectional area;
Step 9, the size determined according to above step, determine the physical dimension of zone of transition gauge length continually varying uniform cross section thickening plate unilateral stretching sample entirety.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107478475A (en) * | 2017-07-25 | 2017-12-15 | 东北大学 | A kind of design method for characterizing the simple tension sample for rolling poor thick plate mechanics behavior |
| JP2019174444A (en) * | 2018-03-29 | 2019-10-10 | 日本製鉄株式会社 | Test piece and method for testing stress corrosion cracking |
| CN110553917A (en) * | 2019-09-11 | 2019-12-10 | 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 |
| CN111060365A (en) * | 2019-11-21 | 2020-04-24 | 华菱安赛乐米塔尔汽车板有限公司 | Tensile sample system for detecting baking hardening value |
| CN112692147A (en) * | 2020-12-07 | 2021-04-23 | 广东石油化工学院 | Intelligent drawing control system and method for rolled differential-thickness plate box-shaped piece |
| CN112908434A (en) * | 2021-01-25 | 2021-06-04 | 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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| CN112692147A (en) * | 2020-12-07 | 2021-04-23 | 广东石油化工学院 | Intelligent drawing control system and method for rolled differential-thickness plate box-shaped piece |
| 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 |
| CN112908434A (en) * | 2021-01-25 | 2021-06-04 | 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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