基于优化方法的复杂各向异性屈服函数参数标定  

Constitutive parameter identification of complex orthotropic yield functions based on optimization method

作　　者：李健强[1] 张赛军[1] 龚小龙[1] 黄珍媛[1] 袁宁[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《塑性工程学报》2017年第1期160-167,共8页Journal of Plasticity Engineering

基　　金：2014年东莞市产学研合作项目(2014509109204);2013年省部产学研专项资金技术攻关项目(2013B090600014)

摘　　要：近年来,一些复杂的各向异性屈服函数被广泛地用来描述各种先进材料塑性成形过程中的屈服行为。这类复杂屈服函数需要标定的参数多,部分力学性能测试实验复杂且参数不易获取。基于单向拉伸实验数据,提出先通过优化方法标定简单各向异性屈服函数(Hill48或Barlat91),通过其理论预测出复杂屈服函数标定所需的力学性能参数,并代替真实实验值完成复杂屈服函数的标定。以常用的Yld2000-2d和BBC2005屈服函数为例,对比分析了不同标定方法对屈服函数预测不同取向时的厚向异性系数、屈服应力以及屈服面的影响规律。通过与不同材料常规标定方法的对比分析,验证了所提出方法的可行性。In recent years,many complex anisotropic yield functions have been proposed and widely used in describing the advanced material＇s yield behavior during plastic forming progress. The identification of the yield functions needs a large number of material mechanics performance parameters,and some of the mechanics performance test experiments are not easy to conduct and the parameters are not easy to obtain. To identify some simple anisotropic yield functions（ Hill48 or Barlat91）,the optimization method was proposed first,with which the mechanics performance parameters needed in identifying the complex yield functions were theoretical predicted,then the identification of complex orthotropic yield functions was completed with the predicted parameters instead of the real experimental ones. Taking the common used yield function Yld2000-2d and BBC2005 for example,the influence of different identification methods on anisotropic parameters r value,yield stress with different angles to rolling direction and yield surface was analyzed. Finally,the feasibility of the proposed identification method was verified by comparing to the conventional identification method of different materials.

关 键 词：各向异性屈服函数 参数标定 优化 单向拉伸 

分 类 号：TG381[金属学及工艺—金属压力加工]