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AZ31판재 온간 성형의 파단 예측을 위한 한계응력 모델
김흥규(H. K. Kim),김우진(W. J. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
Magnesium alloy sheet has a relatively low formability compared to other commercial structural metals though it is press-formed at elevated temperatures to improve the press formability. In general, the formability of magnesium alloy sheet is known to depend on temperature as well as strain-rate imposed on the material, and the accurate prediction of the formability considering the dependence is crucial to design the forming process of magnesium alloy sheet parts. In the recent work, we proposed the failure models based on the critical damage work as well as the critical strain for warm forming of AZ31 sheet. However, it is to be examined whether the criterion is capable of predicting the forming limits for various strain paths of sheet metal before applying the failure model to the sheet forming process under complex strain modes. In this paper, we propose a simple stress-based failure criterion for warm forming of AZ3l sheet motivated by the stress-based FLD concept suggested by Stoughton (2000). The predictability of the stress-based failure criterion will be examined compared with the previous damage work- or strain-based failure models.