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Effect of Plastic Anisotropy on Shear Localization and Fracture in Automotive Sheets

机译：塑性各向异性对汽车板剪切局部化和断裂的影响

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摘要

Tensile instability, as characterized by the Considère law, is one of the factors governing formability of metallic sheets. During tensile deformation, material thins in a narrow band due to shear localization, prior to final fracture. Strain rate value within the localized necking band tends to be higher than outside it and final fracture is governed both by the nature of the shear localization as well as the strain rate differential between the neck and the material outside the neck. This paper reports the dependence of shear localization and fracture on plastic anisotropy of the material. Three types of automotive sheet materials, namely IF steel (BCC structure), AA5754 aluminum alloy (FCC) and AZ31 magnesium alloy (HCP) are examined. Digital image correlation is used to follow the development of deformation pattern during tensile tests. The results show that both narrowing and thinning of the tensile sample occur in IF steel, while only thinning occurs in AA5754 and only narrowing occurs in AZ31. These differences arise from the differences in the plastic anisotropy of the three materials, as measured by their r-values. Even though all three materials exhibit ductile fracture, the damage and fracture processes in the three materials differ from each other.
机译：以Considère法则为特征的拉伸不稳定性是控制金属板成形性的因素之一。在拉伸变形期间，由于最终剪切之前的剪切局部化，材料会在窄带中变薄。局部颈缩带内的应变率值往往比其外部的应变率值高，并且最终的断裂受剪切局部化的性质以及颈与颈外材料之间的应变率差的支配。本文报道了剪切局部化和断裂对材料塑性各向异性的依赖性。研究了三种类型的汽车板材，即IF钢（BCC结构），AA5754铝合金（FCC）和AZ31镁合金（HCP）。在拉伸测试期间，使用数字图像相关性跟踪变形模式的发展。结果表明，拉伸试样的变窄和变薄均发生在IF钢中，而AA5754中仅变薄，而AZ31中仅变窄。这些差异是由于三种材料的塑性各向异性（通过其r值测量）的差异引起的。即使这三种材料都显示出韧性断裂，但这三种材料的损坏和断裂过程却彼此不同。

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