Effect of nonlinear multi-axial elasticity and anisotropic plasticity on quasi-static dent properties of automotive steel sheets
Effect of nonlinear multi-axial elasticity and anisotropic plasticity on quasi-static dent properties of automotive steel sheets
复制标题
非线性多轴弹性和各向异性塑性对汽车钢板准静态凹痕性能的影响
DOI：
10.1016/j.ijsolstr.2016.01.020
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发表时间：
2016
影响因子：
3.6
通讯作者：
Dong
中科院分区：
文献类型：
--
作者：
Jeong;Myoung;F. Barlat;K. Chung;Dong
本文研究了汽车钢板弹塑性特性对其凹痕行为的影响，提出了一种可靠凹痕分析的本构建模方法。通过单轴拉伸、平面内双轴拉伸和正反简单剪切试验，对3种钢板的应力-应变特性进行了测试。采用先进的本构模型来捕捉塑性各向异性、反向加载特性（如包辛格效应）和弹性模量退化。特别地，在本构模型中测量和实现了双轴弹性模量及其退化行为。与传统模型相比，该模型在荷载-位移曲线方面显著提高了凹痕的预测能力。本构模型敏感性研究表明，材料的塑性各向异性和弹性特性对面板刚度影响较大，而反向加载特性对面板永久凹痕深度影响较大。
This study investigates the influence of the elasto-plastic properties of automotive steel sheets on the denting behavior and suggests a constitutive modeling approach for reliable dent analysis. The stress–strain behaviors of three kinds of steel sheets were measured in uniaxial tension, in-plane biaxial tension and forward-reverse simple shear tests. Advanced constitutive models were employed to capture the plastic anisotropy, reverse loading characteristics such as the Bauschinger effect, and elastic modulus degradation. In particular, the biaxial elastic modulus and its degradation behavior were measured and implemented in the constitutive model. The suggested model significantly improved the prediction of dents compared to the conventional model in terms of the load-displacement curve. Sensitivity studies on the constitutive model demonstrated that mainly plastic anisotropy and elastic behavior of a material influence the panel stiffness, whereas the reverse loading behavior strongly affects the permanent dent depth.