期刊
ENGINEERING FRACTURE MECHANICS
卷 141, 期 -, 页码 57-77出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2015.05.005
关键词
Near-threshold fatigue crack growth; Load ratio; Crack closure; Driving force parameter; Load-shedding technique
类别
资金
- National Natural Science Foundation of China [51325504, 51205131]
- Natural Science Foundation of Shanghai [12ZR1442900]
- Shanghai Municipal Education Commission [12CG33]
- Shanghai Education Development Foundation
The current state of influence of load ratio, R, on fatigue crack growth (FCG) behavior is thoroughly reviewed. Two main approaches, including crack closure concept and driving force parameter method, when used independently, are found to be short of accuracy during load-shedding procedure in the near-threshold regime. By combining an equivalent driving force model and crack closure approach, a new crack opening equation and a general FCG law is established for the load-shedding technique. This merging method does not involve crack closure measurement, and is capable to predict R dependence of FCG curves and fatigue thresholds fairly well. (C) 2015 Elsevier Ltd. All rights reserved.
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