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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Prediction of shear localization during large deformation of a continuous cast Al-Mg sheet
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Prediction of shear localization during large deformation of a continuous cast Al-Mg sheet

机译：连续铸造铝镁板大变形过程中的剪切局部化预测

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In this work, a novel continuum solid mechanics approach has been proposed to predict shear band formation in uniaxial tension, utilizing both plane stress and three-dimensional analyses. The approach postulates a heterogeneous distribution of mechanical properties through the starting material. This may be attributed to the second-phase particles, textural banding or grain size variability of the sheet material. The model is used to study the effect of such heterogeneity on the development of shear localization with increasing strain. We also consider how such a model depends on the constitutive equations that are used. It is found that the Voce equation offers realistic predictions of necking and shear localization whilst the Hollomon equation fails to do so over a realistic range of deformation. The location of necking in each structure is controlled by the largest zone of soft material. The influence of the distribution, size and geometry of soft zones have been extensively studied. The amount of inhomogeneity required to precipitate localization is determined and confirmed using the Marciniak-Kuczynski method. The predicted force-displacement curves, limit strains to failure and the shear band angles all agree well with experimental observations.
机译：在这项工作中，提出了一种新颖的连续固体力学方法，可以利用平面应力和三维分析来预测单轴拉伸中的剪切带形成。该方法假定了起始材料中机械性能的异质分布。这可能归因于片材的第二相颗粒，纹理带或晶粒尺寸变化。该模型用于研究这种非均质性对随应变增加而剪切局部化发展的影响。我们还考虑了这样一个模型如何取决于所使用的本构方程。发现Voce方程可提供颈缩和剪切局部化的实际预测，而Hollomon方程在实际的变形范围内无法做到。每个结构中的颈缩位置均由最大的软质材料区域控制。广泛研究了软区的分布，大小和几何形状的影响。使用Marciniak-Kuczynski方法确定并确认沉淀所需的不均匀度。预测的力-位移曲线，极限破坏应变和剪切带角均与实验观察结果非常吻合。

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