Molecular Dynamics Simulation of Brittle Fracture in Bcc Iron

Abstract:

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Crack propagation in bcc iron at different strains under low temperature (30K) has been studied using the atomistic simulation. We show that cracks display a brittle character of extension at low strains, and at relative higher strains cracks extend with a periodic series of twins(or SF) bursts. These bursts decrease the crack speed and produce velocity oscillations with an increase in energy dissipation that increases the toughness. Here we also develop a new form of dynamic fracture energy. Using our form of dynamic fracture energy, the results therefore are in quantitative agreement with the theoretical single-crack equation of motion.

Info:

Periodical:

Edited by:

D. J. Fisher

Pages:

41-50

DOI:

10.4028/www.scientific.net/DDF.272.41

Citation:

H. X. Xie et al., "Molecular Dynamics Simulation of Brittle Fracture in Bcc Iron ", Defect and Diffusion Forum, Vol. 272, pp. 41-50, 2007

Online since:

March 2008

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Price:

$35.00

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