微視的モデルを用いた引抜き加工時の内部割れ欠陥の解析

概要

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Using our proposed and modified micromodel which judges whether ductile fracture occurs or not and our proposed evolution equation which represents the change of void volume fraction, analysis of inner fracture defect in drawing is performed. The obtained results are summarized as follows. Firstly, the two types of void shape and those of void configuration in our previous papers are unified and one type of void shape and that of void configuration are defined. Secondly, the inner diameter of the die at which the material fractures, the material density distribution in the radial direction after drawing through the die which precedes the die at which the material fractures, and the shape of inner fracture defect after drawing through the die at which the material fractures, calculated from analysis agree with those obtained by experiment. Thirdly, the inner diameter of the die at which the material fractures calculated from analysis agrees with that calculated using the Oyane's equation of fracture criterion. The number of unknown constant in our proposed evolution equation is equal to that in the Oyane's equation. Hence, the validity of our proposed micromodel and evolution equation is confirmed.
一般社団法人日本機械学会の論文
2001-08-25