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Isotropic Md Simulations Of Dynamic Brittle Fracture

Published online by Cambridge University Press:  15 February 2011

Pep Español ,
Miguel A. Rubio  and
Ignacio Zúñiga
Pep Español
Affiliation:
Departamento de Física Fundamental, Universidad Nacional de Educación a Distancia, Madrid, Spain
Miguel A. Rubio
Affiliation:
Departamento de Física Fundamental, Universidad Nacional de Educación a Distancia, Madrid, Spain
Ignacio Zúñiga
Affiliation:
Departamento de Física Fundamental, Universidad Nacional de Educación a Distancia, Madrid, Spain
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Abstract

We present results obtained by molecular dynamics simulations on the propagation of fast cracks in triangular 2D lattices. Our aim is to simulate Mode I fracture of brittle isotropic materials. We propose a force law that respects the isotropy of the material. The code yields the correct imposed sound c║, shear c┴ and surface VR wave speeds. Different notch lengths are systematically studied. We observe that initially the cracks are linear and always branch at a particular critical velocity c* ≈0.8VR and that this occurs when the crack tip reaches the position of a front emitted from the initial crack tip and propagating at a speed c = 0.6 8VR.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 409: Symposium Q – Fracture-Instablility Dynamics, scaling and Ductile/Brittle Behavior , 1995 , 101
Copyright
Copyright © Materials Research Society 1996

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References

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