退火T2纯铜单向拉伸损伤本构模型的研究  

Damage Constitutive Model of Annealed T2 Pure Copper Uniaxial Tension

作　　者：李磊[1] 史志铭[2] 张丽[1] 魏亮鱼 LI Lei;SHI Zhi-ming;ZHANG Li;WEI Liang-yu(College of Science,Inner Mongolia University of Technology,Hohhot 010051,China;College of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学理学院,内蒙古呼和浩特010051 [2]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051

出　　处：《内蒙古工业大学学报（自然科学版）》2018年第3期166-174,共9页Journal of Inner Mongolia University of Technology：Natural Science Edition

基　　金：国家自然科学基金项目(11002065;11402126)

摘　　要：利用SEM、OM、MTS试验机等分析和测试了T2纯铜薄板的显微组织和力学性能,研究了晶粒尺寸和临界损伤因子对T2纯铜力学行为的影响,建立了T2纯铜的双线性弹塑性本构模型,量化了晶粒尺寸和微观组织演变对宏观力学行为的影响.结果表明,在其他变形条件相同的情况下,随着晶粒尺寸的增大,材料的屈服强度和抗拉强度减小.T2纯铜的强度随着临界损伤因子的增大而提高.晶粒尺寸和临界损伤因子相同时,材料的形状因子随着应变的增大具有相似的增大趋势.模型得到的预测值与实验值具有较高的一致性,可以准确的揭示T2纯铜在不同退火温度下宏观变形与微观组织演变之间的关系.The microstructure and mechanical properties of T2 pure copper were analyzed by means of scanning electronicmicroscopy,optical microscopy and tensile tests.The influence of grain sizes and critical damage factor on the mechanical behavior of T2 pure copper was studied.Then a bilinear elastoplastic constitutive model of the T2 pure copper was established,and the influence of grain sizes and micro-structure evolution on micro mechanical behavior was under quantitative analysis.The results show that the yield strength and tensile strength decreases with the increasing of grain sizes under the same deformation conditions.With the increasing of critical damage factors,the yield strength and tensile strength of T2 pure copper increases.For the same grain sizes and critical damage factor,the shape factor of the materials shows similar variation trend with the increasing strain.The stress-strain values predicted by the present constitutive model for the T2 pure copper agree with the experimental values,which can reveal the relationship between the macroscopic deformation and the microstructure evolution of T2 pure copper.

关 键 词：本构模型 损伤因子 晶粒尺寸 微结构演变 T2纯铜 

分 类 号：TG146.2[一般工业技术—材料科学与工程]