Abstract Dual phase steels are largely used to form automotive structural parts by deep drawing involving complex loading paths, which influence the material mechanical behavior and formability, as well as subsequent service life. The aim of this paper is to investigate the calibration of a strain path change model from an experimental database involving simple shear tests. The enhanced Homogeneous Anisotropic Hardening (e-HAH) is an advanced constitutive model that can take account of the strain path change influence on the material behavior by using a stress-based indicator. The performance of such a model depends highly on the material parameter identification and the experimental database. The mechanical behavior of a dual phase steel DP600 is first characterized under different linear strain paths, uniaxial and biaxial tension and simple shear, in order to quantify the initial anisotropy. Then, the influence of strain path changes on the material behavior is investigated during sequences involving simple shear, uniaxial tension and compression. Finally, the parameters of e-HAH model are identified and the influence of the experimental database on the optimised parameters is highlighted with the use of different strain paths and different strain ranges.

中文翻译：

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双相钢应变路径变化模型的标定

摘要 双相钢主要用于汽车结构件的深拉成形，其加载路径复杂，影响材料的力学行为和成形性，以及后续的使用寿命。本文的目的是从涉及简单剪切测试的实验数据库中研究应变路径变化模型的校准。增强型均质各向异性硬化 (e-HAH) 是一种先进的本构模型，可以通过使用基于应力的指标来考虑应变路径变化对材料行为的影响。这种模型的性能在很大程度上取决于材料参数识别和实验数据库。双相钢 DP600 的机械行为首先在不同的线性应变路径下进行表征，单轴和双轴拉伸和简单剪切，以量化初始各向异性。然后，在涉及简单剪切、单轴拉伸和压缩的序列期间，研究了应变路径变化对材料行为的影响。最后，通过使用不同的应变路径和不同的应变范围，确定了e-HAH模型的参数，并突出了实验数据库对优化参数的影响。