Prediction of fatigue crack propagation based on dynamic Bayesian network

Author:

Wang Wei1,Yang Yanfang12,Li Mengzhen1,Liu Weikai1,Liu Zhiping12ORCID

Affiliation:

1. School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan, China

2. Engineering Research Center of Port Logistic Technology and Equipment, Ministry of Education, Wuhan, China

Abstract

To address the problem of low prediction accuracy in the current research on fatigue crack propagation prediction, a prediction method of fatigue crack propagation based on a dynamic Bayesian network is proposed in this paper. The Paris Law of crack propagation and the extended finite element method (XFEM) are combined to establish the state equation of crack propagation. The uncertain factors of crack propagation are analyzed, and the prediction model of fatigue crack propagation based on the dynamic Bayesian network is constructed. A Bayesian inference algorithm based on the combination of Gaussian particle filter and firefly algorithm is proposed. The fatigue experiment of the specimen with the pre-cracks is carried out to test the correlation between the fatigue load cycles and the crack propagation depth. The experimental results show that the crack propagation prediction method proposed in this paper can effectively improve the prediction accuracy of crack propagation depth.

Funder

the Fundamental Research Funds for the Central Universities

State Administration for Market Regulation Science and Technology Planned Project

Publisher

SAGE Publications

Subject

Mechanical Engineering

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