期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 31, 期 5, 页码 840-849出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2008.11.004
关键词
Fatigue crack growth; Experimental data; Stainless steel; Stress intensity factor
A series of fatigue crack growth experiments were conducted using round compact tension specimens of AISI 304L stainless steel under Mode I loading. The influences of the R-ratio (the ratio of the minimum load to the maximum applied load in a cycle), notch size, the tensile and compressive overloads, and the loading sequence on crack growth were studied. The results show that the material displays sensitivity to the R-ratio. The application of a tensile overload results in a short period of acceleration in the crack growth rate followed by a significant retardation in the crack growth rate. A compressive overload (underload) produces a short period of acceleration in crack growth and the magnitude of such an acceleration depends on the value of the loading amplitude of the constant-amplitude loading. Results from the two-step high-low loading sequence reveal a period of crack growth retardation at the beginning of the lower amplitude step, an effect similar to that of a single overload. Two existing crack growth models which are based on the stress intensity factor concept are evaluated using the experimental results. A two-parameter crack driving force approach together with a modified Wheeler's model is found to correlate well the crack growth experiments. (C) 2008 Elsevier Ltd. All rights reserved.
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