不同损伤模型的TC4钛合金高温损伤数值仿真及裂纹预测  

Numerical Simulation of High Temperature Damage and Crack Prediction of TC4 Titanium Alloy Different Damage Models

作　　者：陈学文[1] 张博 白荣忍 杨怡思 Akiyoshi Osaka CHEN Xuewen;ZHANG Bo;Bai Rongren;YANG Yisi;Akiyoshi Osaka(College of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Institute of Engineering,Okayama University,Tsushima,Okayama 700-8530,Japan)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]冈山大学工学院,岗山津岛700-8530

出　　处：《河南科技大学学报（自然科学版）》2023年第2期1-7,共7页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(51575162);国家重点研发计划项目(2020YFB2008400)。

摘　　要：对TC4钛合金进行温度800~1000℃、应变速率0.01~5 s^(-1)条件下热拉伸试验。基于Normalized Cockcroft&Latham、Oyane和Rice&Tracey 3种损伤模型,引入了Zener-Hollomon参数,通过遗传算法识别临界损伤值,建立TC4钛合金高温损伤模型。将这3种高温损伤模型集成到Forge软件中,分别对拉伸试验进行仿真计算,比较拉伸试样仿真与试验的断裂长度与断口形貌。结果表明:基于Normalized Cockcroft&Latham高温损伤模型的相关系数R值最大,为0.997。模拟与试验断裂长度具有良好的相关性,且模拟断口与试验断口的形状、颈缩程度吻合度最好,表明该高温损伤模型最适用于预测TC4钛合金的损伤行为。In this paper,the thermal tensile test of TC4 titanium alloy was carried out at temperature of 800~1000℃and strain rate of 0.01~5 s^(-1).Based on the three damage criteria of Normalized Cockcroft&Latham,Oyane and Rice&Tracey with introduction of Zener-Hollomon parameters,the critical damage value was identified by genetic algorithm,and the high temperature damage models of TC4 titanium alloy were established.They were integrated into the Forge software,and the tensile tests were simulated and calculated respectively.The fracture length and fracture morphology of the tensile specimens simulation and tests were compared.The results show that the correlation coefficient R value based on the Normalized Cockcroft&Latham high temperature damage model is the largest,which is 0.997.The simulation and the tests fracture length have a good correlation,and the shape and necking degree of the simulated fracture are most consistent with the tests fracture,indicating that the high temperature damage model is most suitable for predicting the damage behavior of TC4 titanium alloy.

关 键 词：TC4钛合金 优化反求 高温损伤模型 数值模拟 

分 类 号：TG316[金属学及工艺—金属压力加工]