Total Fatigue Life Prediction Methods 981505

Two analytical methods of predicting the total fatigue life of a component such as weldment are compared: a relatively uncomplicated, two-stage, total-life-model known as the initiation-propagation or IP model; and a recently developed model termed the PICC-RICC crack growth model which integrates the effects of plasticity-induced crack closure (PICC) and roughness-induced crack closure (RICC). The PICC-RICC model is combined with estimates crack nucleation life to provide the second total life model herein termed the nucleation-propagation or NP model. The predictions of the IP and NP models are compared and found to be similar. The simpler IP model is then used to explore the potential influence of weld quality, weldment size, base metal strength, and residual stresses on the total fatigue life of weldments.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.