Variable Amplitude Fatigue Testing to Characterize Mode II Delamination in a Polymer Composite

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• 作者：A. R. Anilchandra ; Ramesh Bojja…
• 关键词：Delamination ; FALSTAFF ; Fatigue ; Composite ; Three ; point bending
• 刊名：Transactions of the Indian Institute of Metals
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：69
• 期：2
• 页码：421-424
• 全文大小：764 KB
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• 作者单位：A. R. Anilchandra (1)
  Ramesh Bojja (1)
  N. Jagannathan (1)
  C. M. Manjunatha (1)
  
  1. Fatigue and Structural Integrity Group, Structural Technologies Division, CSIR-National Aerospace Laboratories, Bangalore, 560017, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Materials Science, general
  Tribology, Corrosion and Coatings
  
• 出版者：Springer India
• ISSN：0975-1645

文摘

In this study, the mode II delamination behavior in terms of onset-of-growth and propagation characteristics under a standard variable amplitude (VA) fatigue load sequence was investigated. A special three point bend test fixture was designed and fabricated to perform fatigue tests under VA loads. Standard end notched flexure test specimens of unidirectional IMA/M21 carbon fiber composite were fabricated. A Teflon insert was used to simulate a delamination at the mid plane. The fatigue tests were conducted under a standard mini FALSTAFF VA load sequence. Tests were carried out with different reference values of loads to determine the onset-of-growth, N _onset . Decreasing the reference load was observed to increase the N _onset . Further, the delamination propagation under the mini FALSTAFF load sequence was determined in the same test set-up. It is successfully demonstrated that the test fixture could be used to apply both negative and positive fatigue loads to simulate the service loads. Keywords Delamination FALSTAFF Fatigue Composite Three-point bending