期刊
MECHANICS OF MATERIALS
卷 51, 期 -, 页码 66-73出版社
ELSEVIER
DOI: 10.1016/j.mechmat.2012.04.003
关键词
Fatigue crack growth; Exponential model; Cycle asymmetry; Aluminum alloy 2524
The fatigue crack behavior in metals and alloys under constant amplitude test conditions is usually described by relationships between the crack growth rate da/dN and the stress intensity factor range Delta K. In the present work, an enhanced two-parameter exponential equation of fatigue crack growth was introduced in order to describe sub-critical crack propagation behavior of Al 2524-T3 alloy, commonly used in aircraft engineering applications. It was demonstrated that besides adequately correlating the load ratio effects, the exponential model also accounts for the slight deviations from linearity shown by the experimental curves. A comparison with Elber, Kujawski and Unified Approach models allowed for verifying the better performance, when confronted to the other tested models, presented by the exponential model. (C) 2012 Elsevier Ltd. All rights reserved.
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