Please use this identifier to cite or link to this item: https://doi.org/10.1177/1045389X0446307
Title: Stepwise-equilibrium and adaptive molecular dynamics simulation for fracture toughness of single crystals
Authors: Xu, Y.G.
Liu, G.R. 
Behdinan, K.
Fawaz, Z.
Keywords: Atomic scale
Fracture
Molecular dynamics
Stress intensity factor
Toughness
Issue Date: Dec-2004
Source: Xu, Y.G.,Liu, G.R.,Behdinan, K.,Fawaz, Z. (2004-12). Stepwise-equilibrium and adaptive molecular dynamics simulation for fracture toughness of single crystals. Journal of Intelligent Material Systems and Structures 15 (12) : 933-939. ScholarBank@NUS Repository. https://doi.org/10.1177/1045389X0446307
Abstract: A stepwise-equilibrium and adaptive molecular dynamics (MD) simulation scheme for investigating the fracture toughness of single crystals is proposed in this study. The critical fracture toughness is found by conducting MD simulations along with the gradually increasing external load. At each load step, an equilibrium state is obtained by relaxing the system from the initial state generated. This is done by adjusting the atomic position using an additional displacement of linear elastic solution corresponding to the current load increment. The load increment is adjusted at each step in an adaptive way in order to achieve high computational efficiency and accuracy. A nickel crystal having 14256 atoms is investigated using this technique. The critical stress intensity factor in the (11̄0) plane is found to be 0.7436 MPa √m, while the fracture stress is 4.7776GPa. The effects of vacancies on the critical stress intensity factors are also investigated.
Source Title: Journal of Intelligent Material Systems and Structures
URI: http://scholarbank.nus.edu.sg/handle/10635/61373
ISSN: 1045389X
DOI: 10.1177/1045389X0446307
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