• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2016, Vol. 52 ›› Issue (4): 36-44.doi: 10.3901/JME.2016.04.036

• 材料科学与工程 • 上一篇    下一篇

基于连续介质损伤力学的高强度钢板热成形性数值预测

盈亮1, 2, 史栋勇1, 3, 胡平1, 2, 刘文权1, 3   

  1. 1. 大连理工大学工业装备结构分析国家重点实验室 大连 116024;
    2. 大连理工大学汽车工程学院 大连 116024;
    3. 大连理工大学工程力学系 大连 116024
  • 出版日期:2016-02-15 发布日期:2016-02-15
  • 作者简介:盈亮,男,1983年出生,博士。主要研究方向为热成形损伤及成形性。E-mail:yingliang@dlut.edu.cn;胡平(通信作者),男,1956年出生,博士,教授。主要研究方向为汽车车身工程和固体力学。E-mail:pinghu@dlut.edu.cn
  • 基金资助:
    国家自然科学基金重点(11272075)、中国博士后科学基金(2014M561223)和中央高校基本科研业务费专项资金(DUT14RC(3)032)资助项 目

Numerical Prediction of the Formability during Hot Forming of High Strength Steel Based on Continuum Damage Mechanics

YING Liang1, 2, SHI Dongyong1, 3, HU Ping1, 2, LIU Wenquan1, 3   

  1. 1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024;
    2. School of Automotive Engineering, Dalian University of Technology, Dalian 116024;
    3. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024
  • Online:2016-02-15 Published:2016-02-15

摘要: 基于连续介质损伤力学模型,建立耦合损伤的热成形本构方程。将该本构方程引入到自主开发的金属成形有限元软件KMAS中,从而可对高强度钢板在热成形过程中的损伤演化及成形性能进行预测。本构方程中与温度及应变率相关的损伤参数控制着热成形过程中的损伤演化,对成形性数值预测具有重要的意义。为标定本构方程中的损伤参数,进行不同温度及应变率下的等温热拉伸试验,并对拉伸过程进行数值模拟,通过优化对比数值计算和试验所得的力-位移曲线,获得了不同温度及应变率下的损伤参数。随后将损伤参数引入KMAS中,对一款典型汽车B柱在热成形过程的成形性进行数值预测,并与试验结果进行对比,结果证明了所建立耦合损伤本构方程的正确性。

关键词: 成形性, 高强度钢板, 连续介质损伤力学, 数值预测

Abstract: Based on the continuum damage mechanics model, a constitutive equation coupled with damage for hot forming of high strength steel is developed and implemented into the independently developed commercial CAE software KMAS, which can be used to predict the damage evolution and formability during hot forming. The temperature and strain-rate dependent damage parameters involved in the constitutive equation, which are significant to the numerical prediction of formability, control the damage evolution in hot forming process. The experimental and numerical studies on isothermal tensile process at different temperatures and strain rates are conducted to calibrate the damage parameters. The damage parameters are obtained through the optimized comparison between the experimental and numerical force-displacement curves and subsequently introduced to KMAS. The formability of a typical automotive B-pillar during hot forming is predicted and compared with the experimental results. The good agreement between the numerical and experimental results confirms the validity of the constitutive equation coupled with damage.

Key words: continuum damage mechanics, formability, high strength steel, numerical prediction

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