Abstract
We derive a model problem for quasicontinuum approximations that allows a simple, yet insightful, analysis of the optimal-order convergence rate in the continuum limit for both the energy-based quasicontinuum approximation and the quas i-nonlocal quasicontinuum approximation. For simplicity, the analysis is restricted to the case of second-neighbor interactions and is linearized about a uniformly stretched reference lattice. The o ptimal-order error estimates for the quasi-nonlocal quasicontinuum approximation are given for al l strains up to the continuum limit strain for fracture. The analysis is based on an explicit treatment of the coupling error at the atomistic-to-continuum interface, combined with an analysis of the error due to the atomistic and continuum schemes using the stability of the quasicontinuum approximation.
Original language | English (US) |
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Pages (from-to) | 2455-2475 |
Number of pages | 21 |
Journal | SIAM Journal on Numerical Analysis |
Volume | 47 |
Issue number | 4 |
DOIs | |
State | Published - 2009 |
Keywords
- Atomistic-to-continuum
- Error analysis
- Quasicontinuum