A Γ-Convergence Analysis of the Quasicontinuum Method

A Γ-Convergence Analysis of the Quasicontinuum Method
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拟连续谱方法的 Γ 收敛性分析

DOI:
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发表时间:
2013
影响因子:
1.6
通讯作者:
M. Ortiz
M. Ortiz
中科院分区:
数学3区
文献类型:
--
作者:
Malena I. Español;D. Kochmann;S. Conti;M. Ortiz

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We present a $Gamma$-convergence analysis of the quasicontinuum method focused on the behavior of the approximate energy functionals in the continuum limit of a harmonic and defect-free crystal. The analysis shows that, under general conditions of stability and boundedness of the energy, the continuum limit is attained provided that the continuum---e.g., finite-element---approximation spaces are strongly dense in an appropriate topology and provided that the lattice size converges to zero more rapidly than the mesh size. The equicoercivity of the quasicontinuum energy functionals is likewise established with broad generality, which, in conjunction with $Gamma$-convergence, ensures the convergence of the minimizers. We also show under rather general conditions that, for interatomic energies having a clusterwise additive structure, summation or quadrature rules that suitably approximate the local element energies do not affect the continuum limit. Finally, we propose a discrete patch test that provides a ...
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发表时间: 2013
期刊: MRS Proceedings
影响因子: --
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