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Title: Crack propagation in silica from reactive classical molecular dynamics simulations

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.15292· OSTI ID:1473956

Abstract Mechanistic insight into the process of crack growth can be obtained through molecular dynamics ( MD ) simulations. In this investigation of fracture propagation, a slit crack was introduced into an atomistic amorphous silica model and mode I stress was applied through far‐field loading until the crack propagates. Atomic displacements and forces and an Irving–Kirkwood method with a Lagrangian kernel estimator were used to calculate the J ‐integral of classical fracture mechanics around the crack tip. The resulting fracture toughness ( K IC ), 0.76 ± 0.16 MP a√m, agrees with experimental values. In addition, the stress fields and dissipation energies around the slit crack indicate the development of an inelastic region ~30Å in diameter. This is one of the first reports of K IC values obtained from up‐scaled atomic‐level energies and stresses through the J ‐integral. The application of the Reax FF classical MD force field in this study provides the basis for future research into crack growth in multicomponent oxides in a variety of environmental conditions.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000; DE‐NA0003525
OSTI ID:
1473956
Alternate ID(s):
OSTI ID: 1408053
Report Number(s):
SAND-2018-10004J; 667804
Journal Information:
Journal of the American Ceramic Society, Vol. 101, Issue 4; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (5)

An atomic-scale evaluation of the fracture toughness of silica glass journal May 2018
A Review on Brittle Fracture Nanomechanics by All-Atom Simulations text January 2019
Effect of Domain Size, Boundary, and Loading Conditions on Mechanical Properties of Amorphous Silica: A Reactive Molecular Dynamics Study journal December 2019
The Role of Chemistry in Fracture Pattern Development and Opportunities to Advance Interpretations of Geological Materials text January 2019
A Review on Brittle Fracture Nanomechanics by All-Atom Simulations journal July 2019