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Fatigue crack growth rate data are obtained for ASTM A516 Grade 70 steel subjected to elastic and elastic-plastic cyclic loading for both load-controlled and displacement-controlled test conditions. Cyclic J-integral values estimated from load versus deflection hysteresis loops and crack closure estimates are correlated with growth rate data. The cyclic J-crack growth rate data agree well with that from the linear elastic tests. The J-integral parameter is shown to be better than the linear elastic parameter K in correlating fatigue crack growth, particularly so in ductile materials such as A516 steel and at high load levels.
crack propagation, elastic and elastic-plastic fracture mechanics, J-integral, fatigue, elastic-plastic fracture
El Haddad, MH
Assistant professor, Cairo University, Giza, Cairo
Unit head, Fracture Mechanics, Ontario Hydro Research, Toronto, Ont.