A Practical Engineering Methodology for Fatigue Life Prediction
Presenter: Dr. Yi-Der Lee
Research Engineer, Southwest Research Institute
摘要：
A practical engineering methodology has been developed to analyze and predict fatigue crack growth rates under elastic-plastic and fully-plastic conditions. Under small-scale yielding conditions, the methodology reduces to the customary LEFM (linear elastic fracture mechanics) approach to FCG (fatigue crack growth) analysis based on DK. The methodology employs the closure-corrected effective range of J-integral as the governing parameter. DJ was selected because it best satisfied the simultaneous criteria of theoretical validity, practicality, and demonstrated usefulness. Alternative parameters based on other path-area integrals were critically reviewed and found to be less satisfactory. In this presentation, the effectiveness of this methodology will be demonstrated by its application to the prediction of fatigue crack growth in structural components.