The Effect of Microcrazing on Fatigue Crack Propagation in Polymers.

Abstract

A generalized theory of fatigue crack propagation in polymers is outlined. The theory accounts for fatigue crack propagation through root craze extension accompanied by simultaneous dissemination of microcrazing around the crack-root craze system thereby describing a crack-craze zone (CCZ). In addition to the conventional crack length, the width of CCZ is introduced as a new internal parameter. Applying a special version of the second law of thermodynamics: the principle of minimum thermodynamic forces, these internal parameters are formally described in terms of the reciprocal thermodynamic forces. The rate of crack extension per cycle was found to depend strongly on changes in the width of CCZ. Results of the model are applied to fatigue crack propagation data in polystyrene under various loading conditions and a good description of growth rates is observed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jul 29, 1981
Accession Number
ADA104008

Entities

People

  • A. Chudnovsky
  • A. Moet
  • Eric Baer
  • I. Palley

Organizations

  • Case Western Reserve University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Crack Propagation
  • Cracks
  • Dielectric Polymers
  • Energy
  • Entropy
  • Equations
  • Experimental Data
  • Fracture (Mechanics)
  • Free Energy
  • Materials
  • Mechanics
  • Military Research
  • Polymers
  • Production
  • Security
  • Stress Intensity Factors
  • Surface Energy

Readers

  • Materials Science (Mechanical Engineering).
  • Plasma Physics / Magnetohydrodynamics