The Application of Elastic-plastic Fracture Mechanics to Fatigue Life Prediction
Dr. Yi-Der Lee 李怡德 博士
Southwest Research Institute, San Antonio, TX
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 the 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.
簡歷：
Dr. Lee has over ten years of experience using advanced computational methods to solve a broad range of practical research and development problems in applied mechanics, with a particular focus on fracture mechanics. His major activities emphasized fracture mechanics, treating the problems of damage initiation, failure path prediction, and catastrophic failure under elasto-dynamic and elastic-plastic conditions. Dr. Lee holds a B.S. in Mechanical Engineering from National Cheng Kung University (Tainan, Taiwan), a M.S. and Ph.D. in Applied Mechanics from Lehigh Univerisity (Bethlehem, PA).