SIMILARITY BETWEEN CREEP RUPTURE IN VISCOELASTIC SOLIDS AND FATIGUE IN METALS.

Abstract

A local energy criterion of Irwin's type is applied to a problem of a quasi-static extension of a crack embedded in an elastic-plastic or visco-elastic-plastic matrix. A nonlinear differential equation is given which governs subcritical growth up to the point of gross instability. The creep rupture under sustained loads and fatigue crack propagation, both described by the equation, are shown to follow almost identical mathematical representations. The essential features such as the universal resistance curves, the dependence of growth rate on the current K-factor and the amount of growth vs. time relations are shown to be strikingly similar. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1970
Accession Number
AD0710796

Entities

People

  • Michael P. Wnuk

Organizations

  • South Dakota State University

Tags

DTIC Thesaurus Topics

  • Crack Propagation
  • Cracks
  • Differential Equations
  • Equations
  • Instability
  • Linear Differential Equations
  • Mathematical Analysis
  • Mathematics
  • Nonlinear Differential Equations

Readers

  • Calculus or Mathematical Analysis
  • Materials Science (Mechanical Engineering).