Computational modelling of submicron-sized metallic glasses
Computational modelling of submicron-sized metallic glasses
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DOI：
10.1080/14786435.2013.838326
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发表时间：
2014-01
影响因子：
1.6
通讯作者：
S. Bargmann;Tao Xiao;B. Klusemann
中科院分区：
文献类型：
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作者：
S. Bargmann;Tao Xiao;B. Klusemann
目前的贡献是关于亚微米尺寸金属玻璃的稳定剪切局部化过程的建模和计算。为此，建立了非局部热力学一致的连续力学本构模型。在我们之前的工作中，我们在小应变框架中制定了模型。在目前的工作中，该模型被推广到有限应变。利用有限元方法进行了数值实现。给出了数值例子，说明了与实验观测相关联的一般模型行为。结果表明，所建立的有限变形模型可以很好地预测亚微米金属玻璃的稳定剪切局部化过程及其尺寸效应。模型证实，随着试样尺寸的减小，剪切局部化过程开始于较晚的变形状态。此外，有限变形模型能够定性准确地预测亚微米尺寸金属玻璃的破坏过程及其随样本量减小的延迟。
The present contribution is concerned with the modelling and computation of stable shear localization process in submicron-sized metallic glasses. To this end, a non-local thermodynamically consistent, continuum mechanical, constitutive model is developed. In our previous work, we formulated the model in the small strain framework. In current work, this model is extended to finite strains. The numerical implementation is carried out with the help of the finite element method. Numerical examples are presented – illustrating the general model behaviour which is correlated to experimental observations. It is shown that the proposed finite deformation model is well suitable to predict the stable shear localization process in submicron-sized metallic glasses and its size effect. The model confirms that with decreasing sample size the shear localization process starts at a later deformation state. Additionally, the finite deformation model is able to predict the failure process in submicron-sized metallic glasses as well as the delay of it with decreasing sample size qualitatively correct.