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누엔늑뚜안(Nguyen Duc-Toan),박진기(Park Jin-Gee),김영석(Kim Young-Suk) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Magnesium alloys usually exhibit low ductility at the room temperature due to the unusual mechanical behaviour of its hexagonal close-packed structure. Thus, press forming of magnesium alloy sheets is performed at elevated temperatures of 200℃ to 250℃. Therefore, in this paper a modification of combined kinematic/isotropic hardening model considering the unusual plastic behaviour for magnesium alloy sheet at elevated temperature following Johnson-Cook model was carried out via a user-material subroutine, using explicit finite element code. The simulation results at room temperature was presented and compared with measurements of tension/compression, compression/tension, and validated by bending/unbending simulation for the proposed hardening model. Tension/compression and compression/tension curves at elevated temperature have been predicted. As a case study, the V-bending process for magnesium alloy sheets at elevated temperatures was performed in order to verify spring-back and then compared with spring-back predictions of FE simulation results. The proposed hardening model showed the good agreement between simulation results and corresponding experiments.