Fatigue crack growth under variable-amplitude loading: Part I - Model formulation in state-space setting

Asok Ray, Ravindra Patankar

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

This two-part paper presents formulation and validation of a non-linear dynamical model of fatigue crack growth in ductile alloys under variable-amplitude loading including single-cycle overloads, irregular sequences, and random loads. The model is formulated in the state-space setting based on the crack closure concept and captures the effects of stress overload and reverse plastic flow. The state variables of the model are crack length and crack opening stress. This paper, which is the first part, presents formulation of the state-space model that can be restructured as an autoregressive moving average (ARMA) model for real-time applications such as health monitoring and life extending control. The second part is the companion paper that is dedicated to model validation with fatigue test data under different types of variable-amplitude and spectrum loading.

Original languageEnglish (US)
Pages (from-to)979-994
Number of pages16
JournalApplied Mathematical Modelling
Volume25
Issue number11
DOIs
StatePublished - Nov 2001

All Science Journal Classification (ASJC) codes

  • Modeling and Simulation
  • Applied Mathematics

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