期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 32, 期 6, 页码 879-885出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2009.02.030
关键词
Fatigue-crack-growth; Compression; Stress-intensity factor; Plasticity; Roughness; Fretting debris
This paper summarizes some of the fatigue-crack-growth-rate data generated in the threshold and near-threshold regimes on two aluminum alloys (7075-T651, 7075-T7351), a titanium alloy (Ti-6Al-4V beta-STOA), a high-strength 4340 steel and a nickel-based superalloy (Inconel-718) using compression pre-cracking constant-amplitude (CPCA), compression precracking load-reduction (CPLR), and the ASTM E-647 load-reduction (LR) test methods. Tests were conducted over a range in stress ratios (R = 0.1, 0.4 and 0.7) on compact specimens. One of the aluminum alloys (T651) and the 4340 steel showed very little difference between the methods; however, the other three materials showed significant differences with the compression precracking test methods giving lower thresholds and faster crack-growth rates than the load-reduction test method. Materials that have shown significant differences exhibited either rough crack-surface profiles (7075-T7351, Ti-6A1-4V beta-STOA) or produced fretting debris along the crack surfaces in the threshold and near-threshold regimes (Inconel-718). (C) 2009 Elsevier Ltd. All rights reserved.
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