A modified model for the estimation of fatigue life derived from random vibration theory

When a component is subjected to variable-amplitude loading, if the fundame ntal stress-life cycle relationship and an accumulation rule are given, the n the fatigue damage or fatigue life of the component can be calculated and /or estimated. In the present paper, random vibration theory is incorporate d into the analysis of the above problem. Several formulas are thus derived . Experimental work is then carried out to verify the derived formulas. Com parison is made among the results calculated based on different formulas, d ifferent accumulation rules and different random loading. It is concluded t hat the derived formulas do provide us with quick prediction of the fatigue damage or fatigue life when a component is subjected to variable-amplitude loading that has a certain random nature. (C) 1999 Elsevier Science Ltd. A ll rights reserved.