On modelling of shear fracture in deep drawing of a high-strength dual-phase sheet steel
On modelling of shear fracture in deep drawing of a high-strength dual-phase sheet steel
复制标题
高强度双相钢板拉深剪切断裂建模
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
I. Peshekhodov
中科院分区：
文献类型：
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作者：
B. Behrens;C. Bonk;I. Peshekhodov
本文将DP600双相薄板的断裂行为表征结果应用于深拉深有限元分析，进行剪切断裂预测。表征结果是在基于新型蝴蝶标本拉伸试验的表征方法的帮助下获得的，并由作者先前发表。本文的目的是评价深拉深过程的表征方法。在前人研究的基础上，本文采用修正的mohr - colummb断裂模型对裂缝行为进行了建模。有限元分析结果表明，所用的MMC断裂模型对材料的剪切断裂预测过早。提出了一种新的模型调整方法，在强压力叠加应力状态下产生无限大的断裂应变。在最新的高强度钢板断裂表征中经常出现这种情况，在之前进行的断裂表征中没有测试这种应力状态，而是在研究的深拉深过程中发生的。利用调整后的MMC断裂模型，可以非常准确地预测裂纹起裂力矩，并且可以足够准确地预测裂纹起裂位置。
The paper presents application of fracture behaviour characterisation results of a dual-phase sheet steel DP600 to an FEA of its deep-drawing for shear fracture prediction. The characterisation results were obtained with the help of a characterisation method based on a tensile test on a novel butterfly specimen and published previously by the authors. The aim of the present paper is to evaluate that characterisation method on a deep-drawing process. Based on the previous results of the authors, the fracture behaviour is modelled here with the help of the modified Mohr-Coloumb fracture model. The obtained FEA results reveal that shear fracture of the studied material is predicted too early by the used MMC fracture model. A novel adjustment of the model is proposed yielding infinitely high fracture strains at strongly pressure-superimposed stress states. As it is often the case in the state-of-the-art fracture characterisation of high-strenght sheet steels, such stress states were not tested during the previously performed fracture characterisation but occur during the studied deep drawing process. With the help of the adjusted MMC fracture model, it is possible to predict the crack initiation moment very accurately and the crack initiation location sufficiently accurately.