直缝焊管JCO成形非对称弯曲变形过程分析  

Research on asymmetric bending process of JCO forming for straight-seam welded pipe

作　　者：范利锋[1] 梁培 王葛[2] 马静[3] 张本国 FAN Li-feng;LIANG Pei;WANG Ge;MA Jing;ZHANG Ben-guo(Transportation Institute,Inner Mongolia University,Hohhot 010070,China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,China;College of Material Science and Engineering,Hebei University of Science and Technology,Shijiazhuang,050018,China;Jiangsu Mould Intellingent Manufacturing Engineering Research Center,Yancheng 224051,China)

机构地区：[1]内蒙古大学交通学院,内蒙古呼和浩特010070 [2]燕山大学机械工程学院,河北秦皇岛066004 [3]河北科技大学材料科学与工程学院,河北石家庄05OO18 [4]江苏省模具智能制造工程中心,江苏盐城224051

出　　处：《塑性工程学报》2020年第2期94-101,共8页Journal of Plasticity Engineering

基　　金：国家自然科学资金资助项目(51761030);内蒙古自治区自然科学基金资助项目(2019MS05081)。

摘　　要：针对直缝焊管JCO成形非对称弯曲变形特征,考虑了包辛格效应和变形过程中弹性模量的变化,采用线性随动强化耦合Chord模型描述了直缝焊管JCO成形非对称弯曲变形行为及其特征,结果表明非对称弯曲变形过程可以分为5个变形阶段:刚体转动阶段、全弹性变形阶段、弹塑性未包覆变形阶段、弹塑性包覆阶段和回弹阶段。整个板料变形区可以分为:全弹性变形区、弹塑性未包覆变形区和弹塑性包覆区;其中JCO成形首次弯曲非对称性明显,而二次和三次弯曲非对称性不明显;非对称弯曲回弹量与残余应力水平直接相关,残余应力水平越高,弹性回复应变越小。Aimed at the asymmetric bending deformation characteristics in JCO forming process for straight-seam welded pipe,the linear kinematic hardening coupled Chord model which considering Bauschinger effect and elastic modulus variation during the deformation process was used to describe the behavior and characteristics of asymmetric bending of JCO forming for straight-seam welded pipe. The results show that the deformation process of asymmetric bending can be divided into five stages: rigid body rotation stage,full elastic deformation stage,elastoplastic unwraped deformation stage,elastoplastic wraped stage and springback stage. The whole deformation zone can be divided into three zones: full elastic deformation zone,elastoplastic unwraped deformation zone and elastoplastic wraped zone. The asymmetry of the first bending in JCO forming is obvious,while the asymmetry of the second and the third bending is not obvious. The springback of asymmetric bending is directly related to the level of residual stress. The higher the level of residual stress is,the smaller the elastic recovery strain is.

关 键 词：JCO成形 非对称弯曲 有限元模型 CHORD模型 变形行为 

分 类 号：TG386.3[金属学及工艺—金属压力加工]