Transactions of Materials and Heat Treatment

Title：Relationship of stress state and stress state parameters in plastic deformation

Authors： Li Qinghua Ji Fangran Li Fuguo

Unit： Northwestern Polytechnical University

KeyWords： plastic deformation stress state stress triaxiality soft coefficient Rod parameter

ClassificationCode：TG335.19

year,vol(issue):pagenumber：2014,39(3):122-126

Abstract：

The deformation performance of material is not only related to its chemical composition and microstructure, but also related to the stress state of forming. Stress triaxiality, soft coefficient and Rod parameter are commonly used as stress state parameters in studying the deformation, damage and cracking of metal material. The parameters under nine different stress states and stress amplitudes in plastic forming process were calculated and analyzed. The results show that the stress triaxiality and stress state have a good correspondence, while soft coefficient and Rod parameter have a better correspondence only under plane state of yield stress. Under three dimensional state of yield stress, soft coefficient and Rod parameter can not directly reflect different stress states and deformation types.

Funds：

国家自然科学基金资助项目（51275414）

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