Models relating observed crack growth lengths and rates during fatigue of structures and components have been developed. These models are based on the Paris law model for crack growth. Particularly, acoustic emission was used for characterization of the energy released during crack growth and related to the stress intensity factor and hence, the number of cycles to failure. The models developed were tested experimentally on both laboratory fatigue specimens as well as on structural components. The models accurately predict the evolution of cracks and form the basis for assessment of remaining fatigue life.
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