Dynamical Nonlinear Material Response and Failure

Abstract

Molecular dynamics (MD) studies of the nonlinear viscoelastic response of Lennard-Jones model liquid and glassy systems have shown that strain-induced structural changes occur at elevated strain rates and are the microscopic origin of such phenomena as shear (viscosity) thinning and stress overshoot. The structural changes result in a limit to the steady state stress that the material can sustain. In terms of them it was possible to develop a framework for describing ductile failure and the ductile-to-brittle transition. The semi-quantitative agreement of the MD results and primary laboratory studies in organic liquids, polymers and inorganic glasses suggests that the microscopic processes observed in the former are occuring in, and can be used to interpret phenomen in, the latter three. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1981
Accession Number
ADA108822

Entities

People

  • C. J. Montrose
  • D. M. Heyes
  • Joseph H. Simmons
  • R. K. Mohr
  • T. A. Litovitz

Organizations

  • The Catholic University of America

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Amorphous Materials
  • Chemistry
  • Distribution Functions
  • Energy
  • Engineering
  • Glass
  • Glass Transition Temperature
  • Materials Laboratories
  • Materials Science
  • Measurement
  • Molecular Dynamics
  • Relaxation Time
  • Shear Flow
  • Shear Stresses
  • Silica Glass
  • Viscous Flow
  • Vitreous State

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.