Journal Published Online: 01 May 1995
Volume 23, Issue 3

A Consideration of Evaluation of Fatigue Crack Propagation Rate from Effective Stress Intensity Factor Range



The fatigue crack propagation law was investigated for the two cases of crack propagation in a region of welding residual stress and after overloading. In the former case, the crack propagation rate da/dN was found to depend on the stress ratio R defined by σminmax where σmin, σmax are the minimum and maximum cyclic stresses. Due to the tensile residual stress, the crack propagation rate increased as the stress ratio decreased in the range −2 ≤ R ≤ 0. In the latter case, the crack propagation rate da/dN after overloading was higher than that for the constant stress amplitude test at first and then became lower. The crack propagation rate was thus affected by both the residual stress and the overloading. However, the crack propagation behavior correlated well with the crack closure behavior. Therefore, in the cases considered here, the crack propagation law can be reasonably evaluated from the effective stress intensity factor range ΔKeff.

Author Information

Makabe, C
University of the Ryukyus, Nishihara, Okinawa, Japan
Kaneshiro, H
University of the Ryukyus, Nishihara, Okinawa, Japan
Nishida, S
Saga University, Saga, Japan
Sakihama, H
Japan Transocean Air Corp., Naha-city, Okinawa, Japan
Pages: 7
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Stock #: JTE10404J
ISSN: 0090-3973
DOI: 10.1520/JTE10404J