EIFS considering the uncertainty , stochastic fatigue life prediction using the ultrasonic inspection data .

摘要

Method for predicting the fatigue life of the material stochastically includes the step of sampling the random variable of the actual equivalent initial defect size (EIFS) (41), the fatigue crack growth equations from multivariate distribution parameters (lnC, a step ( 42 ) for generating a random variable regarding m), including a step ( 43 ) to solve the fatigue crack growth equations using these random variables . Recorded EIFS data , using the steps of scanning an object target in ultrasound , the method for recording the echo signals from the object in the target , the previously recorded values from the scanned calibration blocks , the echo signal strength the obtained by the step of converting the equivalent reflector size. Equivalent reflector dimensions include the recorded EIFS data .