Transactions of Materials and Heat Treatment

Title：Numerical analysis of stretching limit for Al-Mg-Si based alloy auto body sheet

Authors： LIN Dun-wen1 CAO Hong-shen2 GUAN Shao-kang2(1. Guangzhou Honda Automobile Co. Ltd. Guangzhou 510700 China 2. School of Materials Science and Engineering Zhengzhou University Zhengzhou 450052 China)

Unit：

KeyWords： sheet metal forming FEM stretching analysis

ClassificationCode：TG386

year,vol(issue):pagenumber：2009,34(3):63-68

Abstract：

Using non-linear FEM software Marc, numerical analysis of stretching limit for Al-Mg-Si based alloy auto body sheets was carried out by means of making up virtual stretching facilities with rigid hemispherical punch and various strain paths, strains disseminating behaviors were analyzed and summarized under "tension-tension" and "tension-compression" strain states, and one method was proposed, i.e., in order to determine critical point of stretching instability, the "stain concentration" geometrical phenomenon might be used as criterion under "tension-tension" strain state and "branch destabilization" physical phenomenon might be used as criterion under "tension-compression" strain state.

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Reference：

[1]林忠钦,李淑慧,于忠奇,等.车身覆盖件冲压成形仿真[M].北京:机械工业出版社,2005.
[2]Keeler S P,Backofen W A.Plastic instability and fracture in sheet stretched over rigid punches[J].Trans.ASM,1963,56(1):25-48.
[3]王勖成,邵敏.有限单元法基本原理和数值方法[M].2版.北京:清华大学出版社,1996.

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