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《Journal of Shanghai Jiaotong University》 2014-05
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Microstructural Study of Advanced High Strength Dual-Phase Steels Sheet Under Stretch-Bending Forming Process

HE Chun-feng;ZHAO Yi-xi;HUANG Sheng;Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures,Shanghai Jiaotong University;  
Stretch-bending is a typical method for sheet stamping forming.Different fracture failure modes occur on advanced high strength dual phase steel based on different stress state.For example,shear fracture occurs under tight radius stretch-bending condition.In this paper,a stretch-bending ratioαwas introduced to indicate different stress states to determine the failure mode:necking or shear fracture.Stretchbending experiments of DP steels were conducted and fracture morphology was observed.The results show that shear fracture still belongs to ductile fracture,and tighter punch radius or higher DP strength leads to shear fracture much more easily.
【Fund】: 国家自然科学基金资助项目(51075267 51375308);; 国际科技合作项目(2010DFA72760)
【CateGory Index】: TG386
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