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汽车安全与节能学报

JASE ›› 2017, Vol. 08 ›› Issue (02): 157-163.DOI: 10.3969/j.issn.1674-8484.2017.02.007

• 汽车安全 • 上一篇    下一篇

高应变率下高强钢的塑性力学行为及本构模型

赖兴华，尹斌   

  1. 清华大学苏州汽车研究院（相城），苏州 215000，中国
  • 收稿日期:2016-11-15 出版日期:2017-06-25 发布日期:2017-07-04
  • 作者简介:赖兴华 (1983—)，男（汉），福建，助理研究员，E-mail: laixinghua@tsari.tsinghua.edu.cn。
  • 基金资助:

    江苏省重点研发计划——产业前瞻与共性关键技术资助项目（BE2015065）。

Plastic mechanical behavior and constitutive modeling of high-strength steel at high strain rates

LAI Xinghua, YIN Bin   

  1. Suzhou Automobile Research Institute (Xiangcheng ), Tsinghua University, Suzhou 215000, China
  • Received:2016-11-15 Online:2017-06-25 Published:2017-07-04

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摘要：

针对高强汽车板具有的应变率效应，研究了应变率相关模型的适用性。基于液压伺服高速拉伸试验机，对低合金高强度冷轧钢 HC340LA 进行了中高应变率（0.1~500 s -1 ）拉伸试验。使用动态显示非线性有限元 LS-DYNA 软件进行了高强钢动态拉伸模拟，对比分析了Johnson-Cook, CowperSymonds 等本构模型对高强钢应变率效应和塑性硬化行为的表征结果。研究表明：与Johnson-Cook, Cowper-Symonds 等本构模型相比，使用 Swift-Hockett-Sherby 加权硬化本构能更准确描述高强钢的塑性流动力学行为，使用应变率内插法可以更准确模拟高强钢的应变率效应。

关键词: 材料力学, 高强钢, 应变率, 动态拉伸, 有限元, 本构模型

Abstract:

The applicability of the model with strain-rate dependence was investigated in view of the strain rate effect of high strength steel. Using hydraulic-servo high speed testing machine, the tension tests of low alloy high strength cold rolled steel HC340LA were carried out at the intermediate-to-high strain rate (0.1~500 s-1). Finite element simulation of the material at different loading speeds was performed with non-linear dynamic explicit code LS-DYNA. Different constitutive models (e.g., Johnson-Cook, Cowper-Symonds) for depicting strain rate effect and plastic yield stress of steel material were compared. The results show that Swift-HockettSherby hardening law is preferable for characterizing the plastic flow stress behavior of high strength steel, and interpolation method is better than constitutive modeling for accurate simulation of strain rate effect of the material.

Key words: mechanics of materials, high strength steel, strain rate, dynamic tension, finite element, constitutive model