Stochastic crack growth under variable loading for health monitoring and prognosis

Christina Willhauck; Subhasish Mohanty; Aditi Chattopadhyay; Pedro Peralta

doi:10.1117/12.776476

3 April 2008 Stochastic crack growth under variable loading for health monitoring and prognosis

Christina Willhauck, Subhasish Mohanty, Aditi Chattopadhyay, Pedro Peralta

Proceedings Volume 6926, Modeling, Signal Processing, and Control for Smart Structures 2008; 69260L (2008) https://doi.org/10.1117/12.776476
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

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.

Citation Download Citation

Christina Willhauck, Subhasish Mohanty, Aditi Chattopadhyay, and Pedro Peralta "Stochastic crack growth under variable loading for health monitoring and prognosis", Proc. SPIE 6926, Modeling, Signal Processing, and Control for Smart Structures 2008, 69260L (3 April 2008); https://doi.org/10.1117/12.776476

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