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International Journal for Multiscale Computational Engineering
Factor de Impacto: 1.016 Factor de Impacto de 5 años: 1.194 SJR: 0.452 SNIP: 0.68 CiteScore™: 1.18

ISSN Imprimir: 1543-1649
ISSN En Línea: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.v8.i2.40
pages 181-194

Molecular Dynamics Study of the Specimen Size and Imperfection Effects on the Failure Responses of Multi-Nanobar Structures

Luming Shen
School of Civil Engineering, University of Sydney
Zhen Chen
Department of Civil & Environmental Engineering, University of Missouri, USA; Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, P. R. China

SINOPSIS

Based on the recent analytical and numerical studies of the size effect on the structural failure response of bar members in parallel arrangement at the macroscopic level, molecular dynamics simulations are performed to investigate the effects of size, imperfection, and number of nanobars on the failure mechanism of nanoscale hierarchical structures with one-dimensional members arranged in parallel. It appears that at the nanoscale the possibility of being in the stable softening regime increases with the decrease of nanobar length, and the energy dissipation associated with the postlimit softening regime increases with the increase of the number of nanobars in the system, regardless of imperfection types. The results obtained at the nanoscale not only match well the analytical and numerical predictions at the macroscopic level, but also provide more insight into the effects of imperfections on the postlimit structural response.

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