• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (16): 47-57.doi: 10.3901/JME.2019.16.047

• 材料科学与工程 • 上一篇    下一篇

基于Lou-2013韧性断裂准则5182铝板成形极限研究

杨卓云1, 赵长财1, 董国疆2, 陈光1, 朱良金2, 杜冰1   

  1. 1. 燕山大学先进锻压成形技术与科学教育部重点实验室 秦皇岛 066004;
    2. 燕山大学河北省特种运载装备重点实验室 秦皇岛 066004
  • 收稿日期:2018-10-26 修回日期:2019-04-04 出版日期:2019-08-20 发布日期:2019-08-20
  • 通讯作者: 董国疆(通信作者),男,1978年出生,博士,教授,博士研究生导师。主要研究方向为车用高强铝板壳构件成形性能及工艺;底盘构件动力学数值仿真及疲劳损伤分析。E-mail:dgj@ysu.edu.cn
  • 作者简介:杨卓云,男,1990年出生,博士研究生。主要研究方向为管板材成形性能理论及工艺。E-mail:zhuoyun1990@163.com;赵长财,男,1964年出生,博士,教授,博士研究生导师。主要研究方向为管、板类零件内高压成形新工艺及其理论,液压机现代设计理论,特种锻造成形工艺。E-mail:zhao1964@ysu.edu.cn;陈光,男,1993年出生,硕士研究生。主要研究方向为管板材特种成形技术及理论。E-mail:744430164@qq.com;朱良金,男,1990年出生,博士研究生。主要研究方向为车用高强铝板壳构件成形性能及工艺。E-mail:13854273010@163.com;杜冰,女,1985年出生,博士,副教授,硕士研究生导师。主要研究方向为管板材特种成形工艺及其起皱失稳理论。Email:pangpang115@ysu.edu.cn
  • 基金资助:
    国家自然科学基金(51605420,51775481)、河北省教育厅高等学校科技计划重点(ZD2017078)和"河北省三三三人才工程"人才培养(A2016002017)资助项目。

Forming Limit Research of 5182 Aluminum Alloy Sheet Based on Lou-2013 Ductile Fracture Criterion

YANG Zhuoyun1, ZHAO Changcai1, DONG Guojiang2, CHEN Guang1, ZHU Liangjin2, DU Bing1   

  1. 1. Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education of China, Yanshan University, Qinhuangdao 066004;
    2. Hebei Key Laboratory of Special Delivery Equipment, Yanshan University, Qinhuangdao 066004
  • Received:2018-10-26 Revised:2019-04-04 Online:2019-08-20 Published:2019-08-20

摘要: 以Lou-2013韧性断裂准则为理论基础研究5182铝合金板材的韧性断裂力学性能,设计圆孔试件、平面应变试件和平面剪切试件的拉伸试验来获取准则中的材料参数。通过该准则确定"断裂应变-应力三轴度"曲线,为ABAQUS软件中的韧性损伤材料模型提供损伤判据,构建5182铝合金板材的韧性损伤仿真模型。利用此模型对上述三个试件的拉伸过程,以及半球形凸模胀形试验过程进行有限元仿真,并通过数据分析绘制基础拉伸试验与半球形凸模胀形仿真相结合的5182铝合金板材成形极限图。试验与仿真表明,所建立的有限元材料模型能够准确地再现三种试件的力程曲线和断裂特征;通过基础拉伸试验与半球形凸模胀形仿真相结合求解出的成形极限图包含两条曲线:损伤成形极限曲线(Damage forming limit curve,Damage FLC)和断裂成形极限曲线(Fracture FLC)。与成形极限试验数据对比表明,采用Damage FLC判定板材破裂失稳偏于安全,为实测成形极限数值的下限,而采用Fracture FLC判定则偏于危险。

关键词: 成形极限, 断裂准则, 铝合金板材, 韧性损伤

Abstract: Based Lou-2013 ductile fracture criterion,the ductile fracture and mechanical property of 5182 aluminum alloy is studied and the tension tests of hole specimen,plain strain specimen and plain shear specimen are designed to obtain the material parameters in the criterion. The "fracture strain-stress triaxiality" curve is determined by the criterion to provide the critical data of the Ductile Damage Material Model in ABAQUS which offers a simulative way to predicate ductile fracture. Based on the Ductile Damage Material Model,a finite element simulation model is created to predicate the ductile fracture of 5182 aluminum alloy. Utilizing the built model,the tension process of the three specimens is simulated and simultaneously the experimental process of bulging test with a hemisphere punch is also simulated which is used to acquire the simulative forming limit curve (FLC). The result of tension test simulation indicates that the built finite element model could accurately simulate the "force-displacement" curve and the fracture situation of the three specimens. The simulative FLC contains two curves-damage forming limit curve(Damage FLC) and fracture forming limit curve(Fracture FLC). Comparing the simulative FLC with experimental data indicates that Damage FLC is safe while Fracture FLC is dangerous when used to predicate fracture of 5182 aluminum alloy sheet.

Key words: aluminum alloy sheet, ductile damage, forming limit diagram, fracture criterion

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