摘要
基于材料单轴拉伸试验及与其有限元模拟的结果的对比,采用优化方法对材料本构模型参数进行识别。假定材料的应力应变关系可以用Ludwick型本构模型来拟合,以材料单轴拉伸试验拉伸载荷-位移关系曲线与有限元数值模拟得到的拉伸载荷-位移曲线的差值的绝对值作为目标函数,以材料本构参数为设计变量,建立了材料本构参数识别优化模型。采用多目标粒子群算法,通过使目标函数极小化来识别材料本构参数。以Q235钢为例,获得了拉伸试验试件颈缩后的真应力与真应变的本构关系,验证了该方法的有效性。
Based on the uniaxial tensile test of materials and the comparison with the results of finite element simulation,the parameters of material constitutive model were identified by the optimization method.Assuming that Ludwick constitutive equation can be used to fit the stress-strain relationship of the material,taking the absolute value of the difference between the load-displacement curve of uniaxial tensile test and that obtained by finite element numerical simulation as the target function,and taking the material constitutive parameters as the design variables,the optimization model of the material constitutive parameters identification was established.Multi-objective particle swarm algorithm was adopted to minimize the objective function in order to identify the material constitutive parameters.Taking Q235 steel as an example,the constitutive relationship between true stress and true strain after necking occurs in tensile test specimen was obtained and the effectiveness of the method was validated.
作者
黄文
赵涵
陆宏
刘智
肖冰冰
秦泗吉
HUANG Wen;ZHAO Han;LU Hong;LIU Zhi;XIAO Bing-bing;QIN Si-ji(National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,China;Key Laboratory of Advanced Forging and Stamping Technology and Science,Ministry of Education,Yanshan University,Qinhuangdao 066004,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2019年第6期251-255,共5页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51675466)
关键词
粒子群算法
有限元法
单轴拉伸试验
应力-应变曲线
particle swarm algorithm
finite element method
uniaxial tensile test
stress-strain curve
