Brittle-ductile behavior in 3D iron crystals

Author： Pelikan V.   Hora P.   Machova A.   Spielmannova A.  

Publisher： Springer Publishing Company

ISSN： 0011-4626

Source： Czechoslovak Journal of Physics, Vol.55, Iss.10, 2005-10, pp. : 1245-1260

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Abstract

We present large scale molecular dynamic (MD) simulations in bcc iron containing a relatively long Griffith crack loaded in mode I at a temperature of K and 300 K. We use N-body potentials of Finnis-Sinclair type. The paper also includes a stress analysis performed in the framework of anisotropic fracture mechanics and on the atomic level as well. It enables us to understand why at 0 K brittle fracture in MD is detected, while at 300 K ductile behavior at the crack front in MD is monitored, starting from the free sample surface.

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