A cumulative damage theory for fatigue crack initiation and propagation |
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Authors: | D. Kujawski F. Ellyin |
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Affiliation: | 1. Institute of Machine Design Fundamentals, Warsaw Technical University, Warsaw, Narbutta 84, Poland;2. Professor of Mechanical Engineering, The University of Alberta, Edmonton, Alberta, Canada T6G 2G8 |
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Abstract: | A method for evaluating the cumulative damage resulting from the application of cyclic stress (or strain) sequences of varying amplitude is presented. Both the crack initiation and propagation stages of the fatigue failure process are included. The development is based on the concept of plastic strain energy dissipation as a function of cyclic life. The damage accumulated at any stage is evaluated from a knowledge of the fatigue limit in the initiation phase and an ‘apparent’ limit obtained through fracture mechanics for the propagation phase. The proposed damage theory is compared with two-level strain cycle test data of thin-walled specimens, and is found to be in fairly good agreement. |
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Keywords: | fatigue fatigue life cumulative damage theory crack initiation crack propagation |
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