316L不锈钢温度相关与非比例强化的粘塑性本构模拟  

VISCOPLASTIC CONSTITUTIVE MODELING FOR TEMPERATURE DEPENDENCE AND NON-PROPORTIONAL HARDENING OF 316L STAINLESS STEEL

作　　者：陈刚[1] 方加晔[1] 金丹[1,2] 陈旭[1] 

机构地区：[1]天津大学化工学院,天津300072 [2]沈阳化工大学能源与动力工程学院,沈阳110142

出　　处：《机械强度》2014年第4期510-515,共6页Journal of Mechanical Strength

基　　金：国家自然科学基金(11172202);教育部新世纪优秀人才(NCET-13-0400);博士后基金(20100480649)资助~~

摘　　要：高温动态应变时效影响316L不锈钢的力学行为,且材料在非比例加载条件下,表现出明显的非比例附加强化特性。基于McDowell粘塑性模型和Chaboche温度相关本构模型,将非比例度嵌入短程背应力模量与各向同性强化模型,提出了一个考虑温度相关与非比例附加强化的粘塑性本构模型,合理描述了室温及873 K下316L不锈钢在单轴、纯扭、比例及非比例加载路径的应力应变响应,得到了与试验一致的结果。Dynamic strain aging effect has a significant impact on macro-mechanical performance of 316L stainless steel under high temperature, meanwhile the material exhibits highly non-proportional additional strain hardening characteristics when bearing non-proportional loading. Based on McDowe11＇ s visco-plastic constitutive model and Chaboche＇ s temperature dependence constitutive theory, the non-proportionality was embedded in short back stress modulus and isotropic hardening in the model. Simulation confirmed that this model reasonably described the stress-strain relationship of the 316L stainless steel whether at room temperature or 873K under different loading paths, such as uniaxial loading path, torsional loading path, proportional loading path and non-proportional loading path.

关 键 词：动态应变时效 温度相关 粘塑性模型 非比例 附加强化 

分 类 号：O345[理学—固体力学]