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《Journal of Shanghai Jiaotong University》 2001-01
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Forecasting the Crack in Metal Powder Forming Process

DONG Lin feng, LI Cong xin (Dept. of Plasticity Tech., Shanghai Jiaotong Univ., Shanghai 200030, China)  
This paper classified the fractures systematically based on the forming stage and causes of fractures which appeared in metal powder forming process. It also analyzed the forming mechanism of fractures using the damage mechanics method. A forecasting model was derived based on Lee's metal powder compacting model and plastic theory for porous material. Considering the affection of stress, strain, stress triaxiality instantaneously and their accumulation, this model can not only show the instantaneous damage state quantificationally, but also materialize the bad affection of strain stress's course during the whole load process. The forming process of T shaped part was simulated with the model. The results show that the fractures appear where the strain and stress triaxiality are higher, which conforms well with the experiment.
【Fund】: 上海市汽车科技发展基金资助项目! (115 9A)
【CateGory Index】: TF124
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