Inhomogeneous deformation in metallic glasses
Inhomogeneous deformation in metallic glasses
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DOI：
10.1016/s0022-5096(01)00115-6
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发表时间：
2002-05-01
影响因子：
5.3
通讯作者：
Nix, WD
中科院分区：
文献类型：
--
作者：
Huang, R;Suo, Z;Nix, WD
本研究为金属玻璃的非均匀变形提供了理论框架。序参量采用自由体积浓度，它是位置和时间的函数。可以改变局部自由体积浓度的三个过程是扩散、湮灭和应力驱动生成。自由体积生成和塑性流动的速率函数取决于底层微观模型，但该框架通常适用于不同的模型。以一个简单的剪切问题为例进行了求解。在齐次解的基础上进行了线性稳定性分析。在初始自由体积分布受到有限振幅扰动的情况下，得到了非齐次解。数值模拟显示了非均匀变形和应变局部化的发展过程。(C) 2002 Elsevier Science Ltd.对所有权利表示不满。
The present study provides a theoretical framework for the inhomogeneous deformation in metallic glasses. The free volume concentration is adopted as the order parameter, Which is a function of position and time. The three processes that can change the local free volume concentration are diffusion, annihilation, and stress-driven creation. The rate functions for free volume generation and plastic flow depend on the underlying microscopic model, but the framework is generally valid for different models. A simple shear problem is solved as an example. A linear stability analysis is performed on the basis of the homogeneous solution. An inhomogeneous solution is obtained with a finite amplitude disturbance to the initial free volume distribution. Numerical simulation shows the development of the inhomogeneous deformation and strain localization. (C) 2002 Elsevier Science Ltd. All rights resented.