A stochastic model of fatigue crack propagation under variable-amplitude loading

Asok Ray, Ravindra Patankar

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

This paper presents a stochastic model of fatigue crack propagation in ductile alloys that are commonly encountered in mechanical structures and machine components of complex systems (e.g. aircraft, spacecraft, ships and submarines, and power plants). The stochastic model is built upon a deterministic state-space model of fatigue crack propagation under variable-amplitude loading. The (non-stationary) statistic of the crack growth process for center-cracked specimens is obtained as a closed form solution of the stochastic differential equations. Model predictions are in agreement with experimental data for specimens fabricated from 2024-T3 and 7075-T6 aluminum alloys and Ti-6Al-4 V alloy subjected to constant-amplitude and variable-amplitude loading, respectively. The stochastic model of crack propagation can be executed in real time on an inexpensive platform such as a Pentium processor.

Original languageEnglish (US)
Pages (from-to)477-493
Number of pages17
JournalEngineering Fracture Mechanics
Volume62
Issue number4-5
DOIs
StatePublished - Mar 1999

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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