基于指数强化模型的预拉力影响角型材拉弯的回弹分析  

The analysis on the effect of pre-stretch force on spring-back of rotary stretch bending of L-section extrusions based on power-law hardening model

作　　者：于成龙[1] 王俊彪[2] 王永军[2] 

机构地区：[1]北京航空航天大学机械工程及自动化学院 [2]西北工业大学机电学院

出　　处：《材料科学与工艺》2011年第1期131-134,138,共5页Materials Science and Technology

基　　金：国家高技术研究发展计划资助项目(2001AA421130)

摘　　要：为从理论上研究预拉力对角型材拉弯回弹的影响,采用指数强化材料模型,在分析角型材截面应力应变分布的基础上,建立了型材转台式拉弯解析模型.分析讨论了预拉力对角型材截面应力分布和加载弯矩的影响规律,并计算得到了回弹角随预拉力变化的规律曲线.与采用双线性强化材料模型的解析计算结果比较表明:采用指数强化材料模型计算的回弹结果与实验数据更吻合.To theoretically study of pre-stretch force effect on spring-back of L-section extrusions in rotary stretch bending,an analytical model of stress and strain distributions in section is presented with using power-law harden material constitutive model.The variations of stress distributions with pre-stretch force in section are analyzed and discussed as well as applied bending moment,and also a curve that spring-back angle varying with pre-stretch force is presented.The results compared with experimental data show that the analytical model is more accurate to predict spring-back than another one built by using bilinear harden constitutive model in rotary stretch bending.

关 键 词：回弹 解析模型 转台式拉弯 预拉力 

分 类 号：TG302[金属学及工艺—金属压力加工]