Journal
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
Volume 110, Issue -, Pages 9-13Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2013.04.015
Keywords
Fatigue crack growth; Crack closure; Near-threshold fatigue; Load ratio; Crack driving force
Funding
- National Natural Science Foundation of China [51205131]
- Natural Science Foundation of Shanghai [12ZR1442900]
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It was still short of generalized fatigue crack growth (FCG) models in the near-threshold regime due to its complex influencing factors. The near-threshold FCG behaviour of a rotor steel 25Cr2Ni2MoV at different load ratios was investigated experimentally, and the FCG driving mechanism was theoretically analysed based on equivalent driving force model. It was found that the crack growth process was determined by combined effects of equivalent driving force at constant amplitude loading and crack closure. A new crack closure model was proposed by considering the influences of load ratio and FCG rate, which could successfully interpret the effect of load ratio on FCG. The correlation of the crack closure model with the transition of driving forces in crack advance was beneficial to unify crack closure theory and crack growth driving parameters in the near-threshold regime. (C) 2013 Elsevier Ltd. All rights reserved.
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