Journal
ENGINEERING FRACTURE MECHANICS
Volume 115, Issue -, Pages 241-254Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2013.11.007
Keywords
Ultrasonic fatigue; Cumulative damage; Repeated two-step tests; Fish-eye fracture; Fatigue crack growth
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Funding
- Kyusyu Electric Power Co., Inc.
- Hokkaido Electric Power Co. Inc.
- Tohoku Electric Power Co. Inc.
- Tokyo Electric Power Company
- Chubu Electric Power Co., Inc.
- Hokuriku Electric Power Company
- Kansai Electric Power Co., Inc.
- Chugoku Electric Power Co., Inc.
- Shikoku Electric Power Co. Inc.
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Growth rates of optically dark areas (ODA) and fish-eyes (FE) were quantified in kHzultrasonic fatigue tests on SUJ2 and 17-4PH steels at constant and repeated two-step amplitudes. Sizes of ODAs and FEs depended on the stress intensity factor (SIF) range, and interior fatigue crack growth rates (FCGR) were slower than those of long cracks in air, suggesting vacuum as ODA growth environment. Repeated two-step tests on SUJ2 steel served to form beach marks so that, a quantification of ODA sizes, interior FCGRs and SIFs became possible. Additional FCGR measurements of long cracks in vacuum and comparable fracture morphologies allowed estimating the growth rates of ODAs and FEs in 17-4PH steel. (C) 2013 Elsevier Ltd. All rights reserved.
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