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Proceedings Paper

Stochastic crack growth under variable loading for health monitoring and prognosis
Author(s): Christina Willhauck; Subhasish Mohanty; Aditi Chattopadhyay; Pedro Peralta
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Paper Abstract

This paper formulates a stochastic model of fatigue crack growth in ductile alloys under variable loading of the center wing type. This center wing loading has three different load ratios to depict the most demanding operating conditions. The cumulative distribution function of the crack length estimate is generated by numerically solving a stochastic differential equation describing the physics of the crack growth. The model parameters are obtained by analyzing each load span, and the variable model parameter is used in the corresponding load period. Simulations are used to show that the analytical crack exceedance probability follows the experimental data fairly well.

Paper Details

Date Published: 3 April 2008
PDF: 8 pages
Proc. SPIE 6926, Modeling, Signal Processing, and Control for Smart Structures 2008, 69260L (3 April 2008); doi: 10.1117/12.776476
Show Author Affiliations
Christina Willhauck, Arizona State Univ. (United States)
Subhasish Mohanty, Arizona State Univ. (United States)
Aditi Chattopadhyay, Arizona State Univ. (United States)
Pedro Peralta, Arizona State Univ. (United States)

Published in SPIE Proceedings Vol. 6926:
Modeling, Signal Processing, and Control for Smart Structures 2008
Douglas K. Lindner, Editor(s)

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