Abstract:

A new count method based on updated coefficient matrix of efficiency is presented. The loading spectrum need not be cut at the maximum absolute values of load, and the local stress strain responses can be analyzed from the start of loading spectrum. Hence the real local stress(or strain) spectrum can be obtained. The fatigue life of a notched specimen under random loading spectrum is evaluated by means of the present method. The result shows that the present method is more reasonable and more useful than the count method based on the original coefficient matrix of efficiency.

Key words: fat igue, loading, fat igue failure