A Synthesis of Crack Growth Theories in Fatigue into Some Statistical Distributions of Fatigue Life.

摘要

The proposed model for fatigue life is a synthesis of the distributional properties of three separate phases of fatigue crack growth. The convolved distribution of life contains three estimable parameters and a function disposable within a restricted class. The problem of estimating all three parameters using the method of maximum likelihood is examined and shown to be impossible of solution in certain cases. This indicates that one of the parameters must be determined a priori from concepts of strength of materials or fracture mechanics.