skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Molecular-dynamics study of ductile and brittle fracture in model noncrystalline solids

Abstract

Molecular-dynamics simulations of fracture in systems akin to metallic glasses are observed to undergo embrittlement due to a small change in interatomic potential. This change in fracture toughness, however, is not accompanied by a corresponding change in flow stress. Theories of brittle fracture proposed by Freund and Hutchinson indicate that strain rate sensitivity is the controlling physical parameter in these cases. A recent theory of viscoplasticity in this class of solids by Falk and Langer further suggests that the change in strain rate sensitivity corresponds to a change in the susceptibility of local shear transformation zones to applied shear stresses. A simple model of these zones is developed in order to quantify the dependence of this sensitivity on the interparticle potential. {copyright} {ital 1999} {ital The American Physical Society}

Authors:
 [1]
  1. Department of Physics, University of California, Santa Barbara, California 93106 (United States)
Publication Date:
OSTI Identifier:
686447
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 60; Journal Issue: 10; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; FRACTURE PROPERTIES; METALLIC GLASSES; BRITTLE-DUCTILE TRANSITIONS; MOLECULAR DYNAMICS METHOD; FRACTURE MECHANICS

Citation Formats

Falk, M.L. Molecular-dynamics study of ductile and brittle fracture in model noncrystalline solids. United States: N. p., 1999. Web. doi:10.1103/PhysRevB.60.7062.
Falk, M.L. Molecular-dynamics study of ductile and brittle fracture in model noncrystalline solids. United States. doi:10.1103/PhysRevB.60.7062.
Falk, M.L. Wed . "Molecular-dynamics study of ductile and brittle fracture in model noncrystalline solids". United States. doi:10.1103/PhysRevB.60.7062.
@article{osti_686447,
title = {Molecular-dynamics study of ductile and brittle fracture in model noncrystalline solids},
author = {Falk, M.L.},
abstractNote = {Molecular-dynamics simulations of fracture in systems akin to metallic glasses are observed to undergo embrittlement due to a small change in interatomic potential. This change in fracture toughness, however, is not accompanied by a corresponding change in flow stress. Theories of brittle fracture proposed by Freund and Hutchinson indicate that strain rate sensitivity is the controlling physical parameter in these cases. A recent theory of viscoplasticity in this class of solids by Falk and Langer further suggests that the change in strain rate sensitivity corresponds to a change in the susceptibility of local shear transformation zones to applied shear stresses. A simple model of these zones is developed in order to quantify the dependence of this sensitivity on the interparticle potential. {copyright} {ital 1999} {ital The American Physical Society}},
doi = {10.1103/PhysRevB.60.7062},
journal = {Physical Review, B: Condensed Matter},
number = 10,
volume = 60,
place = {United States},
year = {1999},
month = {9}
}