Fatigue Crack Growth Rate Testing of Two Structural Steels

A cooperative testing program on fatigue crack growth rate was organized by a division of the SAE Fatigue Design and Evaluation Committee. Two structural steels in plate form typical of those used in the ground vehicle industry were tested, with seven laboratories performing fatigue crack growth rate tests. Excellent agreement among laboratories is obtained in control tests at a load ratio of R = 0.1. Test data are reported for additional R values ranging from -1.0 to 0.8, and also for cracking both parallel and transverse to the rolling direction.