arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1007.2336math.NAcs.NA
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一种具有有限程相互作用的广义准非局域原子到连续耦合方法

A Generalized Quasi-Nonlocal Atomistic-to-Continuum Coupling Method with Finite Range Interaction

Xingjie Helen Li, Mitchell Luskin

AI总结:

针对晶体变形计算,提出一种广义准非局域耦合方法,将原子模型与基于Cauchy-Born规则的粗粒模型结合,并扩展到任意有限程相互作用,同时分析了线性化的稳定性和精度。

摘要:

准确高效地计算晶体固体的变形需要将裂纹和位错等晶格缺陷附近的原子模型与远离缺陷的粗粒模型耦合起来。准连续方法利用基于Cauchy-Born规则推导的应变能密度用于粗粒模型。已经提出了几种准连续方法来耦合原子模型与Cauchy-Born应变能密度。准非局域耦合方法易于实现,并且在短程相互作用下实现了相当准确的耦合。在本文中,我们给出了一维空间中准非局域方法的新公式,使其能够扩展到任意有限程相互作用。我们还分析了广义准非局域方法线性化的稳定性和精度,该方法适用于直到晶格不稳定性的应变。

英文摘要:

The accurate and efficient computation of the deformation of crystalline solids requires the coupling of atomistic models near lattice defects such as cracks and dislocations with coarse-grained models away from the defects. Quasicontinuum methods utilize a strain energy density derived from the Cauchy-Born rule for the coarse-grained model. Several quasicontinuum methods have been proposed to couple the atomistic model with the Cauchy-Born strain energy density. The quasi-nonlocal coupling method is easy to implement and achieves a reasonably accurate coupling for short range interactions. In this paper, we give a new formulation of the quasi-nonlocal method in one space dimension that allows its extension to arbitrary finite range interactions. We also give an analysis of the stability and accuracy of a linearization of our generalized quasi-nonlocal method that holds for strains up to lattice instabilities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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