A state-space model of fatigue crack growth

Ravindra Patankar, Asok Ray, Akhlesh Lakhtakia

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

This paper proposes a nonlinear dynamic model of fatigue crack growth in the state-space setting based on the crack closure concept under cyclic stress excitation of variable amplitude and random loading. The model state variables are the crack length and the crack opening stress. The state-space model is capable of capturing the effects of stress overload and underload on crack retardation and acceleration, and the model predictions are in fair agreement with experimental data on the 7075-T6 aluminum alloy. Furthermore, the state-space model recursively computes the crack opening stress via a simple functional relationship and does not require a stacked array of peaks and valleys of stress history for its execution; therefore, savings in both computation time and memory requirement are significant. As such, the state space model is suitable for real-time damage monitoring and control in operating machinery.

Original languageEnglish (US)
Pages (from-to)235-249
Number of pages15
JournalInternational Journal of Fracture
Volume90
Issue number3
DOIs
StatePublished - Jan 1 1998

Fingerprint

Fatigue Crack Growth
State-space Model
Fatigue crack propagation
Crack
Cracks
Crack Closure
Crack closure
Functional Relationship
Aluminum Alloy
Overload
Prediction Model
Nonlinear Dynamics
Machinery
Nonlinear Model
Aluminum alloys
Dynamic models
Dynamic Model
State Space
Damage
Excitation

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Modeling and Simulation
  • Mechanics of Materials

Cite this

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A state-space model of fatigue crack growth. / Patankar, Ravindra; Ray, Asok; Lakhtakia, Akhlesh.

In: International Journal of Fracture, Vol. 90, No. 3, 01.01.1998, p. 235-249.

Research output: Contribution to journalArticle

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