A simple model for dislocation behavior, strain and strain rate hardening evolution in deforming aluminum alloys
A simple model for dislocation behavior, strain and strain rate hardening evolution in deforming aluminum alloys
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DOI：
10.1016/s0749-6419(01)00015-8
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发表时间：
2002-01-01
影响因子：
9.8
通讯作者：
Lege, DJ
中科院分区：
文献类型：
--
作者：
Barlat, F;Glazov, MV;Lege, DJ
在这项工作中，使用一个简单的位错模型来模拟应力-应变行为。该模型使用三个变量来描述位错布居：平均森林位错密度和活动位错密度，Rho(F)和Rho(M)，以及平均位错平均自由程L。然而，在合理的假设下，只有两个变量是独立的。由位错模型导出的数学形式被应用于室温下测定的纯铝、3003-O、2008-T4、6022-T4、5182-O和5032-T4铝合金板材的应力-应变实验数据。从单一的应力-应变曲线计算了这些材料的状态变量的演化。将应变为0.5时的平均位错平均自由程与位错胞格大小或位错间距的透射电子显微镜观察结果进行了比较。预测与实验之间取得了很好的一致性。(C)2002爱思唯尔科学有限公司。保留所有权利。
In this work, modeling of the stress-strain behavior is carried out using a simple dislocation model. This model uses three variables to characterize the dislocation population: The average forest and mobile dislocation densities, rho(f) and rho(m), and the average dislocation mean free path L. However, it is shown that within reasonable assumptions, only two of these variables are independent. The mathematical form derived from this dislocation-based model was applied to experimental stress-strain data determined at room temperature for pure aluminum, 3003-O, 2008-T4, 6022-T4, 5182-O and 5032-T4 aluminum alloy sheets. The evolution of the state variables was calculated for these materials from a single stress-strain Curve. The average dislocation mean free paths at a strain of 0.5 were compared with TEM observations of dislocation cell sizes or inter-dislocation spacing for specimens deformed equal biaxially with the hydraulic bulge test. A very good agreement was obtained between predictions and experiments. (C) 2002 Elsevier Science Ltd. All rights reserved.