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http://dx.doi.org/10.3795/KSME-A.2011.35.10.1299

Bayesian Parameter Estimation for Prognosis of Crack Growth under Variable Amplitude Loading  

Leem, Sang-Hyuck (School of Aerospace & Mechanical Engineering, Korea Aerospace Univ.)
An, Da-Wn (School of Aerospace & Mechanical Engineering, Korea Aerospace Univ.)
Choi, Joo-Ho (School of Aerospace & Mechanical Engineering, Korea Aerospace Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.35, no.10, 2011 , pp. 1299-1306 More about this Journal
Abstract
In this study, crack-growth model parameters subjected to variable amplitude loading are estimated in the form of a probability distribution using the method of Bayesian parameter estimation. Huang's model is employed to describe the retardation and acceleration of the crack growth during the loadings. The Markov Chain Monte Carlo (MCMC) method is used to obtain samples of the parameters following the probability distribution. As the conventional MCMC method often fails to converge to the equilibrium distribution because of the increased complexity of the model under variable amplitude loading, an improved MCMC method is introduced to overcome this shortcoming, in which a marginal (PDF) is employed as a proposal density function. The model parameters are estimated on the basis of the data from several test specimens subjected to constant amplitude loading. The prediction is then made under variable amplitude loading for the same specimen, and validated by the ground-truth data using the estimated parameters.
Keywords
Prognostics and Health Management; Crack Growth Prognosis; Bayesian Parameter Estimation;
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