Towards mechanism-based simulation of impact damage using exascale computing
Towards mechanism-based simulation of impact damage using exascale computing
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DOI：
10.1063/1.4971615
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
A. Shterenlikht;L. Margetts;S. McDonald;N. Bourne
中科院分区：
文献类型：
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作者：
A. Shterenlikht;L. Margetts;S. McDonald;N. Bourne
在过去的60年里，有限元方法在工程结构变形模拟方面取得了很大的成功。然而，该方法需要定义表示材料对外加载荷的响应的本构模型。有两个问题。首先，这些模型往往难以定义。其次，模型和适应变形的机制之间往往没有物理联系。在这篇文章中，我们提出了一种潜在破坏的两层策略，它在宏观尺度上耦合有限元方法，在介观尺度上耦合元胞自动机。元胞自动机被用来模拟裂纹扩展等机制。应力-应变关系是对微观和细观尺度变化的连续力学尺度的解释。元胞自动机和有限元之间的迭代双向更新推动了模拟向前推进，因为材料在高应变率下经历了渐进损伤。策略是具体的..。
Over the past 60 years, the finite element method has been very successful in modelling deformation in engineering structures. However the method requires the definition of constitutive models that represent the response of the material to applied loads. There are two issues. Firstly, the models are often difficult to define. Secondly, there is often no physical connection between the models and the mechanisms that accommodate deformation. In this paper, we present a potentially disruptive two-level strategy which couples the finite element method at the macroscale with cellular automata at the mesoscale. The cellular automata are used to simulate mechanisms, such as crack propagation. The stress-strain relationship emerges as a continuum mechanics scale interpretation of changes at the micro- and meso-scales. Iterative two-way updating between the cellular automata and finite elements drives the simulation forward as the material undergoes progressive damage at high strain rates. The strategy is particul...