Experimental and finite element analysis for fracture of coating layer of galvannealed steel sheet

查看全文 作　　者：[1]S.I.KIM;[2]J.U.HER;[2]Y.C.JANG;[2]Y.LEE

机构地区：[1]Sheet Products and Process Research Group, POSCO Techology Research Laboratory;[2]Department of Mechanical Engineering, Chung-Ang University

出　　处：《Transactions of Nonferrous Metals Society of China》索引2011年第21卷第A01期,共6页

基　　金：supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0074936) 摘　　要：Mechanical properties of galvannealed (GA) steel sheet used for automotive exposed panel and predicted failure phenomenon of its coating layer were evaluated using finite element method. V-bending test was performed to understand better the fracture of coating layer of GA steel sheet during plastic deformation. Yield strength of the coating layer was calculated by using a relative difference between hardness of coating layer measured from the nano-indentation test and that of substrate. To measure shearing strength at the interface between substrate and coating layer, shearing test with two specimens attached by an adhesive was carried out. Using the mechanical properties measured, a series of finite element analyses coupled with a failure model was performed. Results reveal that the fracture of coating layer occurs in an irregular manner at the region where compressive deformation is dominant. Meanwhile, a series of vertical cracks perpendicular to material surface are observed at the tensile stressed-region. It is found that 0.26-0.28 of local equivalent plastic strain exists at the coating and substrate at the beginning of failure. The fracture of coating layer depends on ductility of the coating layer considerably as well. 关键词：有限元分析镀锌钢板断裂涂层界面剪切强度实验纳米压痕试验等效塑性应变

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Experimental and finite element analysis for fracture of coating layer of galvannealed steel sheet

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