Fatigue crack propagation under variable-amplitude load: Part II - a stochastic model

Asok Ray, Ravindra Patankar

Research output: Contribution to conferencePaper

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Abstract

This paper is the second part in a two-part sequence and presents a stochastic model of fatigue crack propagation in metallic materials 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 the deterministic state-space model of fatigue crack growth under variable-amplitude load presented in the first part. Predictions of the stochastic model are in agreement with the experimental data for specimens made of 2024-T3 and 7075-T6 aluminum alloys and Ti-6Al-4V alloy. The (non-stationary) statistics of the crack growth process under (tensile) variable-amplitude load can be obtained in a closed form without solving stochastic differential equations in the Wiener or Ito setting. The crack propagation model thus allows real-time execution of decision algorithms for risk assessment and life prediction on inexpensive platforms such as a Pentium processor.

Original languageEnglish (US)
Pages23-28
Number of pages6
Publication statusPublished - Dec 1 1998
EventProceedings of the 1998 ASME International Mechanical Engineering Congress and Exposition - Anaheim, CA, USA
Duration: Nov 15 1998Nov 20 1998

Other

OtherProceedings of the 1998 ASME International Mechanical Engineering Congress and Exposition
CityAnaheim, CA, USA
Period11/15/9811/20/98

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All Science Journal Classification (ASJC) codes

  • Software
  • Mechanical Engineering

Cite this

Ray, A., & Patankar, R. (1998). Fatigue crack propagation under variable-amplitude load: Part II - a stochastic model. 23-28. Paper presented at Proceedings of the 1998 ASME International Mechanical Engineering Congress and Exposition, Anaheim, CA, USA, .