Modeling on strain softening and Portevin-Le Chatelier effect in crystalline materials based on mesoplasticity

摘要：

A lattice model for investigation of strain soften phenomenon and meso-scale plastic deformation instabilities of polycrystalline material in tension is proposed. The modelling approach is constructed on the basis of the physical observation of mesoscopic deformation mechanisms, the microstructure information at sub-grain scale and mesoplasticity of the crystalline. Inhomogeneous physical properties of microstructure are induced by a statistical consideration to the model. Portevin-Le Chatelier (PLC) effects are simulated by this simple model. Numerical results showed that this simple lattice model captures most of the PLC features and consistent with experimental data.

关键词： Micromechanical model Portevin-Le Chatelier effect Dislocation slip Strain softening Microplasticity Metallic materials

作者: Wenge Zhang Xuedong Chen Tiecheng Yang Bing Wang

作者单位: National Engineering Research Center for Pressure Vessel Safety Technology, No. 888, West ChangJiang National Engineering Research Center for Pressure Vessel Safety Technology, No. 888, West ChangJiang

会议类型: 国际会议

会议名称: 国际断裂力学2007年会(Fracture Mechanics and Applications 2007)

会议地点: 长沙

会议语种:英文

页码: 201-206

在线出版日期: 2007-11-01（万方平台首次上网日期，不代表论文的发表时间）