基于冲击液压胀形试验及遗传算法构建薄壁管动态塑性本构关系  

Construction of dynamic plastic constitutive relation of thin-walled tubes based on liquid impact forming test and genetic algorithm

作　　者：李玉寒 徐波 刘建伟[1,3] LI Yu-han;XU Bo;LIU Jian-wei(Mechanical and Electrical Engineering Training Center,Guilin University of Electronic Technology,Guilin 541004,China;School of Computer Science and Information Security,Guilin University of Eledronic Technology,Guilin 541004,China;School of Mechanical and Electrical Engineering,Guilin University of Eletlronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学机电综合工程训练中心,广西桂林541004 [2]桂林电子科技大学计算机与信息安全学院,广西桂林541004 [3]桂林电子科技大学机电工程学院,广西桂林541004

出　　处：《塑性工程学报》2021年第2期139-145,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51765013,51564007);广西科技计划项目(2018AD19207)。

摘　　要：为了准确构建冲击液压胀形真实环境下金属薄壁管的动态塑性本构关系,提出了一种基于遗传算法构建薄壁管本构关系的方法。首先,通过对冲击液压成形中金属薄壁管应力应变状态的分析,确定了薄壁管塑性本构模型及力学关系;然后,在冲击液压胀形试验过程中,基于三维数字散斑相关法实时在线获取薄壁管胀形区塑性变形参数;接着根据试验变形数据,利用遗传算法确定了薄壁管的塑性本构关系;最后,将运用遗传算法和一般线性回归法确定的薄壁管材料参数分别用于DYNAFORM和ANSYS Workbench联合仿真,并将模拟得到的管材胀形轮廓曲线、最大胀形高度与试验结果进行对比。结果表明,运用遗传算法获得的各项结果的偏差均最小,故基于遗传算法能更准确地预测薄壁管的动态塑性本构关系。To accurately construct the dynamic plastic constitutive relation of the thin-walled metal tube for liquid impact forming in real environment,an approach to construct the constitutive relation of thin-walled tubes based on genetic algorithm was proposed.First,the plastic constitutive model and mechanical relation of the thin-walled tube were determined by analyzing the stress and strain state of tubes in liquid impact forming.Then,based on the 3 D digital speckle correlation method,the plastic deformation parameters of the bulge area of tube were obtained in the process of liquid impact forming test.Subsequently,the plastic constitutive relation of the thin-walled tube was determined by genetic algorithm according to experimental deformation data.Finally,the thin-walled tube material parameters determined by genetic algorithm and general linear regression method were substituted into the joint simulation of DYNAFORM and ANSYS Workbench,respectively,and the bulge profile and the maximum bulge heights obtained by simulation were compared with those obtained by the test to verify the reliability of the proposed approach.Results show that the variance of the results achieved by genetic algorithm is the smallest,which indicates that dynamic constitutive relation of the thin-walled tube can be predicted more accurately based on genetic algorithm.

关 键 词：冲击液压胀形 遗传算法 动态塑性本构关系 数值模拟 

分 类 号：TG394[金属学及工艺—金属压力加工]