Isotropic MD simulations of dynamic brittle fracture

Conference · Sat Nov 30 23:00:00 EST 1996

OSTI ID:400609

Espanol, P; Rubio, M A; Zuniga, I ^[1]

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1. Univ. Nacional de Educacion a Distancia, Madrid (Spain). Dept. de Fisica Fundamental

The authors present results obtained by molecular dynamics simulations on the propagation of fast cracks in triangular 2D lattices. Their aim is to simulate Mode 1 fracture of brittle isotropic materials. They propose a force law that respects the isotropy of the material. The code yields the correct imposed sound c{sub {parallel}}, shear c{sub {perpendicular}} and surface V{sub R} wave speeds. Different notch lengths are systematically studied. They observed that initially the cracks are linear and always branch at a particular critical velocity c* {approx} 0.8V{sub R} 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 = 0.68V{sub R}.

• OSTI ID: 400609
• Report Number(s): CONF-951155--; ISBN 1-55899-312-6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPUTER CALCULATIONS
CRACK PROPAGATION
CRACKS
DEFORMATION
DIFFERENTIAL EQUATIONS
ELASTICITY
FRACTURE PROPERTIES
MATERIALS
MOLECULAR MODELS
NOTCHES
TIME DEPENDENCE
VELOCITY