期刊
COMPOSITE STRUCTURES
卷 97, 期 -, 页码 76-83出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2012.09.046
关键词
Polymer matrix composite materials; Fatigue; Thermography; Material properties
资金
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Canada Foundation for Innovation (CFI)
- Ontario Innovation Trust (OIT)
- NSERC
Thermography was used to investigate the fatigue behavior of a braided carbon fiber polymeric composite plate. A thermographic approach, originally developed in an earlier study for metallic alloys, was employed to rapidly determine the composite high cycle fatigue strength. The method yielded a fatigue threshold value that was in excellent agreement with that obtained through a conventional experimental test program. The damage mechanisms responsible for the increased heat dissipation and ultimately failure were identified, which provides support for the existence of a fatigue threshold for this material. An extension of the thermographic technique to rapidly determine the entire fatigue stress-life curve for the composite plate provided a direct correlation to the stress-life curve determined through a conventional test program. Energy dissipation was also used as an indicator to determine the high cycle fatigue strength, providing support for the thermographic approach. A relationship between the dissipated heat, the intrinsic energy dissipation and the number of cycles to failure has been clearly established. (C) 2012 Elsevier Ltd. All rights reserved.
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