各向异性材料流动应力模型研究  

Investigation of flow stress models for anisotropic materials

作　　者：刘国承[1,2] 王超[1,2] 宋燕利[1,2] 薛鹏举[3] Liu Guocheng;Wang Chao;Song Yanli;Xue Pengju(Hubei Key Laboratory of Advanced Technology for Automotive Components;Hubei Collaborative Innovation Center for Automotive Components Technology,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Material Processing and Die and Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]武汉理工大学现代汽车零部件技术湖北省重点实验室,湖北武汉430070 [2]武汉理工大学汽车零部件技术湖北省协同创新中心,湖北武汉430070 [3]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2018年第8期45-49,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家重点研发计划资助项目(2018YFB1106700);新能源汽车科学与关键技术学科创新引智基地资助项目(B17034);湖北省自然科学基金资助项目(2016CFB269)

摘　　要：根据塑性应变的等效原理,基于Hill48屈服准则,建立各向异性材料等效塑性应变表达式,并应用于各向异性材料流动应力的建模.将Swift模型、Voce模型及Swift-Voce模型等流动应力模型应用于各向异性材料应变强化行为预测.结果表明：在材料均匀变形的小应变范围内,三种模型的决定系数高于0.998,均方根优于2.523,具有很高的拟合精度;在材料的大应变范围内,Swift-Voce模型的决定系数为0.967,均方根为11.973,预测效果最佳,能较好地预测各向异性材料大应变范围的流动应力.研究结果可为材料的数值模拟提供更准确的流动应力模型,提高计算精度.Based on the principle of equivalent for plastic strain and the Hill48 yield criterion,a new equivalent plastic strain expression was derived and used to establish some flow stress models for anisotropic materials.Flow stress models,such as Swift,Voce and Swift-Voce models,were investigated in the hardening properties for an anisotropic material.Results show these models have very high fitting precision within uniform strain range.Coefficients of determination are better than 0.998,and root mean square errors are better than 2.523 in these cases.However,the best model is the Swift-Voce type for predicting flow stress of the anisotropic material in a wide range of strains. Its coefficient of determination and root mean square error are 0.967 and 11.973,respectively.Research results can provide more accurate flow stress models and improve calculation accuracy for anisotropic materials.

关 键 词：流动应力 塑性应变 各向异性 模型 等效 

分 类 号：TG38[金属学及工艺—金属压力加工]