预应变对TA2力学性能的影响及本构模型的建立  

Influence of pre strain on the mechanical properties of TA2 and the establishment of constitutive model

作　　者：李一帆 代巧 郭成 冯立斌 Li Yifan;Dai Qiao;Guo Cheng;Feng Libin(School of Mechanical Engineering,Jiangsu University of Technology,Changzhou 213001,Jiangsu,China)

机构地区：[1]江苏理工学院机械工程学院,江苏常州213001

出　　处：《钢铁钒钛》2024年第5期83-90,共8页Iron Steel Vanadium Titanium

基　　金：江苏省研究生科研与实践创新计划项目(XSJCX22_21)。

摘　　要：为研究预应变对TA2力学性能的影响,对原始材料和预应变量为10%、20%和30%的TA2进行室温拉伸试验;根据预应变对TA2力学性能的影响规律,引入预应变量对Hollomon模型、Ludwik模型和Swift模型进行修正,以预测预应变TA2的力学行为。结果表明,随预应变量的增加,TA2的屈服强度显著增大、抗拉强度小幅增大,而断后伸长率、强塑积和应变硬化指数减小。预应变通过消耗塑性性能来提升TA2的强度,TA2塑性应变能密度和断裂应变能密度随预应变量的增加而明显减小。各修正模型预测结果与试验值相关性系数的平均值分别为0.9862、0.9994、0.9744,最大预测误差为6.34%、8.33%、16.42%,其中Hollomon模型结构精简且具有良好的预测精度,是描述预应变对TA2力学行为影响的最佳选择。To investigate the effect of prestrain on the mechanical properties of TA2,room temperature tensile tests were conducted on the TA2 original material and specimens with the prestrains of 10%,20%,and 30%.Based on the influence of prestrain on the mechanical properties of TA2,prestrain variables were introduced to modify the Hollomon model,Ludwik model,and Swift model to predict the mechanical behavior of prestrained TA2.The results show that with the increase of prestrain,the yield strength of TA2 increases significantly,the tensile strength slightly increases,and the elongation after fracture,strength plastic product,and strain hardening indexes decrease.Prestrain enhances the strength of TA2 by consuming plastic properties,and the plastic strain energy density and fracture strain energy density of TA2 decrease significantly with the increase of prestrain.The average correlation coefficients between the predicted results of each modified model and the experimental values are0.9862,0.9994,and 0.9744,with the maximum prediction errors of 6.34%,8.33%,and 16.42%,respectively.Among them,the Hollomon model has a simplified structure and good prediction accuracy,making it the best choice to describe the effect of prestrain on the mechanical behavior of TA2.

关 键 词：TA2 预应变 力学性能 本构模型 

分 类 号：TF823[冶金工程—有色金属冶金] TG146.2[一般工业技术—材料科学与工程]