CN113588421A - Method for evaluating forming performance of sheared edge of metal plate - Google Patents
Method for evaluating forming performance of sheared edge of metal plate Download PDFInfo
- Publication number
- CN113588421A CN113588421A CN202110892398.4A CN202110892398A CN113588421A CN 113588421 A CN113588421 A CN 113588421A CN 202110892398 A CN202110892398 A CN 202110892398A CN 113588421 A CN113588421 A CN 113588421A
- Authority
- CN
- China
- Prior art keywords
- samples
- degrees
- notch
- metal plate
- evaluating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A method for evaluating the forming performance of a sheared edge of a metal plate comprises the following steps: s1: preparing bilateral V-shaped symmetrical notch samples a, b and c from a plate, wherein the positions of the samples a, b and c are respectively 0-5 degrees, 40-50 degrees and 85-90 degrees between the stretching direction and the rolling direction of the plate, and the stretching direction is the stretching direction of a tensile test; s2: performing uniaxial tensile test on the tensile sample to obtain the opening displacement S of the notch when the sample is under the maximum load0、S45And S90In which S is0、S45And S90Respectively opening displacement of the notches when the samples a, b and c are subjected to uniaxial tension and maximum load; s3: s is obtained by calculation of formula 1AVThe formula 1 is SAV=（S0+S45+S90)/3. S obtained by the inventionAVThe value evaluates the edge forming performance, the method is simple and rapid, the human factors are few, and the problem of unreliable data is solved.
Description
Technical Field
The invention belongs to the technical field of steel material application, and particularly relates to a method for evaluating the shearing edge forming performance of a metal plate.
Background
The continuous improvement of the requirements on the light weight and the safety of the car body promotes the wide application of high-strength steel in the design of the car body, the material can be subjected to different strain modes or paths in the cold forming process, such as shearing, single-drawing, plane strain, double-drawing and the like, the difference of the strain modes also provides different requirements for the performance of the material, particularly the high-strength steel, after shearing, the formability of the edge part of the high-strength steel is poor in certain deformation modes, such as shearing edge drawing and the like, because the edge part of a plate can be subjected to complex plastic deformation during shearing blanking, defects such as cavities, micro cracks and the like can be formed in an edge part matrix, the forming performance of the shearing edge part of the high-strength steel is sharply reduced due to the defects, the edge part failure cannot be evaluated and predicted through a conventional forming limit diagram, and the design and the use of the material are difficult, so the forming characteristics of parts are required in the design and the application of products, the formability of the sheared edge of the material used is rapidly evaluated, particularly for high strength steels where the edge condition characteristics are sensitive.
In engineering, technicians often adopt the hole expansion rate to evaluate the forming performance of the high-strength steel shearing edge and form related tests and detection standards, but the states of punching equipment, the judgment of a first penetrating crack during hole expansion, the measurement of the aperture and the like all vary from person to person, so that the personal error of data is increased, and finally obtained data can only be applied in specific occasions.
Disclosure of Invention
The technical problems solved by the invention are as follows: the method for evaluating the shearing edge forming performance of the metal plate is provided, the forming performance of the shearing edge of the steel plate is rapidly judged, the method has few artificial interference factors, and the test is simple and rapid.
The technical scheme of the invention is as follows: a method for evaluating the forming performance of a sheared edge of a metal plate comprises the following steps:
s1: preparing bilateral V-shaped symmetrical notch samples a, b and c from a plate, wherein the positions of the samples a, b and c are respectively 0-5 degrees, 40-50 degrees and 85-90 degrees between the stretching direction and the rolling direction of the plate, and the stretching direction is the stretching direction of a tensile test;
s2: performing uniaxial tensile test on the tensile sample to obtain the opening displacement S of the notch when the sample is under the maximum load0、S45And S90In which S is0、S45And S90Respectively opening displacement of the notches when the samples a, b and c are subjected to uniaxial tension and maximum load;
s3: s is obtained by calculation of formula 1AVThe formula 1 is SAV=（S0+S45+S90）/3。
Further, the dimensions of the samples a, b, c are: the length is 120 plus or minus 1.0mm, the width is 55 plus or minus 0.5mm, and the middle position of the sample in the length direction is a notch.
Furthermore, the sample notch is made by a linear cutting method.
Further, the symmetric gap size: the distance of the tip is 35 plus or minus 0.5mm, the radius of the tip is 0.25 plus or minus 0.01mm, and the notch angle is 60 plus or minus 5 degrees.
Further, the samples a, b, and c were oriented at 0 °, 45 °, and 90 ° to the plate rolling direction in the drawing direction, respectively.
Further, the tensile strain rate in the step S2 was 0.001S-1。
SAVCan be used as an evaluation index of edge forming performance in plate and strip shearing, SAVHigh value gives excellent edge forming performance of the material, SAVLow value material edgeThe partial formability is poor.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
1. the method is suitable for evaluating the edge formability of all metal materials, particularly for forming steel grades which are very sensitive to the edge quality, such as high-strength steel and the like.
2. S obtained by the inventionAVThe value evaluates the edge forming performance, the method is simple and rapid, the human factors are few, and the problem of unreliable data is solved.
Drawings
FIG. 1 is a schematic view of a tensile specimen in examples 1 to 3;
FIG. 2 is a graph showing the relationship between the notch opening displacement and the tensile load of a notch tensile specimen in which the tensile direction of the DP780 steel sheet in example 2 is 90 DEG to the rolling direction of the sheet;
FIG. 3S obtained in examples 1 to 6AVValues are plotted against the corresponding steel plate hole expansion ratio.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples 1-6 steel sheets with different compositions of metallic materials, the steel sheet designations and specifications are shown in table 1, comprising the following steps:
1) uniaxial tensile samples a, b and c are prepared by a linear cutting method, the samples are bilaterally symmetrical notches, the sizes of the samples are shown in table 1, and angles formed by the tensile directions of the samples a, b and c and the rolling direction of the plate are shown in table 1.
2) The processed test piece was mounted on a tensile tester at room temperature, and then subjected to uniaxial stretching at a tensile strain rate of 0.001s-1Recording the notch opening displacement-load curve until the sample is broken, and reading the opening displacement S of the three-position notch under the maximum tensile load0、S45And S90，S0、S45And S90The values are shown in Table 2.
3) Will three bit directionsThe opening displacement of the lower notch is averaged, i.e. by the formula SAV=(S0+S45+S90) Calculating to obtain SAV。
TABLE 1
TABLE 2
In Table 2, YS is yield strength and TS is tensile strength.
Specimens were prepared from the sampled steel plates of examples 1 to 6 in accordance with ISO 16630: 2017, carrying out a hole expansion test to obtain a hole expansion rate HER (%), specifically, obtaining a 100 x 100mm square sample with a middle prefabricated hole diameter (d0) of 10mm by adopting a blanking method, under the peripheral compression state, carrying out hole expansion by adopting a punch with a cone angle of 60 degrees, and calculating the hole expansion rate HER = d1-d0/100 by adopting a hole diameter d1(mm) when a first penetrating crack is generated. Three sets of tests were performed on each sample, with the results shown in table 2. From Table 2, the S values obtained in the examples of the process are shown under stringent test conditionsAVThe hole expansion rate HER (%) obtained by the traditional method has good correspondence, which shows that the notch opening displacement and the hole expansion rate of the steel plate follow a very strict linear relationship, namely the quality of the hole expansion performance of the steel grade can be evaluated according to the size of the notch opening displacement, and the precision of test data is improved.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (6)
1. A method for evaluating the forming performance of a sheared edge of a metal plate comprises the following steps:
s1: preparing bilateral V-shaped symmetrical notch samples a, b and c from a plate, wherein the positions of the samples a, b and c are respectively 0-5 degrees, 40-50 degrees and 85-90 degrees between the stretching direction and the rolling direction of the plate, and the stretching direction is the stretching direction of a tensile test;
s2: performing uniaxial tensile test on the tensile sample to obtain the opening displacement S of the notch when the sample is under the maximum load0、S45And S90In which S is0、S45And S90Respectively opening displacement of the notches when the samples a, b and c are subjected to uniaxial tension and maximum load;
s3: s is obtained by calculation of formula 1AVThe formula 1 is SAV=（S0+S45+S90）/3。
2. The method for evaluating the forming performance of the sheared edge of the metal plate as claimed in claim 1, wherein the dimensions of the samples a, b and c are as follows: the length is 120 plus or minus 1.0mm, the width is 55 plus or minus 0.5mm, and the middle position of the sample in the length direction is a notch.
3. The method as claimed in claim 1, wherein the notches are formed by wire cutting.
4. The method for evaluating the forming performance of the sheared edge of the metal plate as claimed in claim 1, wherein the symmetrical gap size is as follows: the distance of the tip is 35 plus or minus 0.5mm, the radius of the tip is 0.25 plus or minus 0.01mm, and the notch angle is 60 plus or minus 5 degrees.
5. A method as claimed in any one of claims 1 to 4, wherein the samples a, b and c are oriented at 0 °, 45 ° and 90 ° to the drawing direction and the rolling direction, respectively.
6. The method for evaluating a sheared edge forming property of a metal plate according to any one of claims 1 to 4, wherein the step of S2 is a step ofTensile strain rate of 0.001s-1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110892398.4A CN113588421A (en) | 2021-08-04 | 2021-08-04 | Method for evaluating forming performance of sheared edge of metal plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110892398.4A CN113588421A (en) | 2021-08-04 | 2021-08-04 | Method for evaluating forming performance of sheared edge of metal plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113588421A true CN113588421A (en) | 2021-11-02 |
Family
ID=78255074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110892398.4A Pending CN113588421A (en) | 2021-08-04 | 2021-08-04 | Method for evaluating forming performance of sheared edge of metal plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113588421A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114544359A (en) * | 2022-02-09 | 2022-05-27 | 哈尔滨焊接研究院有限公司 | Method and device for testing strength and plasticity of titanium alloy welding strip |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289975A (en) * | 2016-08-12 | 2017-01-04 | 上海电气电站设备有限公司 | The test method of material domain fracture toughness |
| KR101769952B1 (en) * | 2016-05-30 | 2017-08-21 | 울산과학기술원 | Triaxial stress analyzing method |
| CN107532980A (en) * | 2015-05-08 | 2018-01-02 | 杰富意钢铁株式会社 | The evaluation method that can sheared edge be molded |
| KR20200065972A (en) * | 2018-11-30 | 2020-06-09 | 주식회사 포스코 | Method of evaluating formability of bulk metallic mateterial |
| CN111595697A (en) * | 2020-04-10 | 2020-08-28 | 唐山钢铁集团有限责任公司 | Method for judging shearing resistance forming capability of material in stamping process |
| CN112547838A (en) * | 2019-09-10 | 2021-03-26 | 宝山钢铁股份有限公司 | Method for testing edge forming limit of metal plate |
-
2021
- 2021-08-04 CN CN202110892398.4A patent/CN113588421A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107532980A (en) * | 2015-05-08 | 2018-01-02 | 杰富意钢铁株式会社 | The evaluation method that can sheared edge be molded |
| KR101769952B1 (en) * | 2016-05-30 | 2017-08-21 | 울산과학기술원 | Triaxial stress analyzing method |
| CN106289975A (en) * | 2016-08-12 | 2017-01-04 | 上海电气电站设备有限公司 | The test method of material domain fracture toughness |
| KR20200065972A (en) * | 2018-11-30 | 2020-06-09 | 주식회사 포스코 | Method of evaluating formability of bulk metallic mateterial |
| CN112547838A (en) * | 2019-09-10 | 2021-03-26 | 宝山钢铁股份有限公司 | Method for testing edge forming limit of metal plate |
| CN111595697A (en) * | 2020-04-10 | 2020-08-28 | 唐山钢铁集团有限责任公司 | Method for judging shearing resistance forming capability of material in stamping process |
Non-Patent Citations (4)
| Title |
|---|
| 庄华晔 等: "金属板材不同应力状态断裂试验及断裂模型建立", 汽车工艺与材料, no. 11, pages 43 - 47 * |
| 肖有谷: "裂纹张开位移(COD)试验方法", 流体机械, no. 07, pages 37 - 46 * |
| 董梁: "高强钢板材剪切边缘局部成形性能表征与开裂预测研究", 中国博士学位论文全文数据库 工程科技Ⅱ辑, no. 08, pages 31 - 41 * |
| 龚宇 等: "改善高强双相钢冲裁边部成形性能", 钢铁钒钛, vol. 37, no. 04, pages 143 - 151 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114544359A (en) * | 2022-02-09 | 2022-05-27 | 哈尔滨焊接研究院有限公司 | Method and device for testing strength and plasticity of titanium alloy welding strip |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ghoo et al. | Evaluation of the mechanical properties of welded metal in tailored steel sheet welded by CO2 laser | |
| US20080196801A1 (en) | Preparation of nanostructured materials having improved ductility | |
| EP3531107B1 (en) | Jig assembly comprising bending jig and apparatus and method for measurng bending tensile strenght using the same | |
| EP3339462B1 (en) | Austenitic stainless steel foil | |
| CN113588421A (en) | Method for evaluating forming performance of sheared edge of metal plate | |
| Sulamet-Ariobimo et al. | Tensile properties analysis of AA1100 aluminium and SS400 steel using different JIS tensile standard specimen | |
| EP3339461A1 (en) | Stainless steel foil | |
| CN106133178A (en) | There is the iron-nickel alloy of higher weldability | |
| Zhang et al. | Improving the shear test to determine shear fracture limits for thin stainless steel sheet by shape optimisation | |
| Prasad et al. | Evaluation of hole expansion formability of high strength AA7075 alloy under varying temper conditions | |
| Deb et al. | Understanding material behaviour of ultrafine-grained aluminium nano-composite sheets with emphasis on stretch and bending deformation | |
| Tsoupis et al. | Edge crack sensitivity of lightweight materials under different load conditions | |
| Antoine et al. | Effect of microstructure on strain-hardening behaviour of a Ti-IF steel grade | |
| Tajally et al. | An experimental study on earing and planar anisotropy of low carbon steel sheets | |
| CN115096727A (en) | Method for rapidly determining hydrogen embrittlement mechanism and sensitivity of high-strength steel | |
| KR20150059502A (en) | Method for detecting segregation in thin steel sheet | |
| Gu et al. | A practical methodology to evaluate and predict edge cracking for advanced high-strength steel | |
| JENABALI et al. | Investigation of formability of low carbon steel sheets by forming limit diagrams | |
| Tseng et al. | Mechanical and bending characteristics of invar sheets | |
| JP2004002988A (en) | Phosphor bronze wire having excellent bending workability | |
| Nghishiyeleke et al. | Formability characterization of aluminium AA6082-O sheet metal by uniaxial tension and Erichsen cupping tests | |
| Subramani et al. | Studies on testing and modelling of formability in aluminium alloy sheet forming | |
| US20130025337A1 (en) | Gasket-Oriented Steel Plate Manufacturing Method, and Gasket | |
| TWI720816B (en) | Fast screening method to identify the hole expansion performance of ultra-high-strength cold-rolled steel by bending test | |
| WO2023095528A1 (en) | Method for evaluating brittle crack arrest performance of thick steel plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |