轧制差厚板变厚度区的应力应变关系表征

doi:10.3901/JME.2018.18.049

机械工程学报 ›› 2018, Vol. 54 ›› Issue (18): 49-54.doi: 10.3901/JME.2018.18.049

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轧制差厚板变厚度区的应力应变关系表征

张思佳¹, 刘相华¹, 刘立忠²

1. 东北大学轧制技术及连轧自动化国家重点实验室沈阳 110819;
2. 东北大学材料科学与工程学院沈阳 110819

收稿日期:2018-01-06 修回日期:2018-04-25 出版日期:2018-09-20 发布日期:2018-09-20
通讯作者: 刘相华(通信作者),男,1953年出生,博士,教授,博士研究生导师。主要研究方向为塑性成形理论、金属成形过程有限元分析、高精度轧制技术等。E-mail:liuxh@mail.neu.edu.cn
作者简介:张思佳,男,1990年出生,博士研究生。主要研究方向为变厚度板材成形性能及工艺。E-mail:15840042289@163.com
基金资助:
国家自然科学基金（U1460107）和科技部国际合作专项（2015DFA50780）资助项目。

Characterization of Stress-strain Relationship of Tailor Rolled Blank's Thickness Transition Zone

ZHANG Sijia¹, LIU Xianghua¹, LIU Lizhong²

1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819;
2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819

Received:2018-01-06 Revised:2018-04-25 Online:2018-09-20 Published:2018-09-20

摘要/Abstract

摘要： 针对轧制差厚板几何形状不均匀、力学性能不均匀的特征，设计了适用于差厚板的单向拉伸试样，并加工等宽度试样用作比较。结合数字散斑技术对两种拉伸试样进行单向拉伸试验，结果表明新型差厚板拉伸试样变形更加充分，应变分布更加均匀。通过计算获得差厚板变厚度区材料的真应力-真应变曲线，利用插值法构建差厚板材料模型。将材料模型用于差厚板试样的单向拉伸数值模拟中，发现数值模拟和试验获得的试样应变分布及力-位移曲线吻合程度较高，与试验相比模拟所预测的试样断后伸长率略低，误差范围为9.0%～14.0%。结果表明，数值模拟与试验具有良好的一致性，材料模型的准确度较高，具有实用性。新型拉伸试样同时考虑了差厚板厚度不均匀和力学性能不均匀的特性，通过一次拉伸试验即可获得变厚度区任意位置处的真应力-真应变曲线，对差厚板力学性能和后续加工工艺研究具有实际价值。

关键词: 材料模型, 数字散斑技术, 轧制差厚板, 真应力-真应变曲线

Abstract: In view of the fact that tailor rolled blank (TRB) has the characteristics of structural differentiation and mechanical properties differentiation, a new type of tensile specimen suitable for TRB is proposed and a conventional tensile specimen with constant width is produced for comparison purpose. Uniaxial tensile experiments on above tensile specimens are carried out with digital speckle correlation method. The results show that strain distribution of the new type tensile specimen is relative homogeneous. True stress-true strain curves of materials in thickness transition zone are calculated. The material model of TRB is constructed by the method of interpolation and is applied to numerical simulation of TRB tensile specimen. It can be observed that the strain distribution of numerical and experimental results is similar and the force-displacement curves agree well. The error between the elongation of the specimen after test of experiment and simulation is between 9.0% and 14.0%. The experimental results are consistent with the FE results, the material model is accurate and practical. The variation in mechanical properties and thickness are considered in the new type of tensile specimen and the true stress-true stain curve of any region of TRB can be calculated through only one tensile test. The proposing of the tensile specimen has practical value for the investigation of mechanical properties and subsequent forming process of TRB.

Key words: digital speckle correlation method, material model, tailor rolled blank, true stress-strain curves

中图分类号:

TG142

张思佳, 刘相华, 刘立忠. 轧制差厚板变厚度区的应力应变关系表征[J]. 机械工程学报, 2018, 54(18): 49-54.

ZHANG Sijia, LIU Xianghua, LIU Lizhong. Characterization of Stress-strain Relationship of Tailor Rolled Blank's Thickness Transition Zone[J]. Journal of Mechanical Engineering, 2018, 54(18): 49-54.

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轧制差厚板变厚度区的应力应变关系表征

Characterization of Stress-strain Relationship of Tailor Rolled Blank's Thickness Transition Zone

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