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

Anilchandra, AR and Bojja, R and Jagannathan, N and Manjunatha, CM (2016) Variable Amplitude Fatigue Testing to Characterize Mode II Delamination in a Polymer Composite. Transactions of the Indian Institute of Metals, 69 (2). pp. 421-424. ISSN 09722815

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Abstract

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.

Item Type:	Article
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials
Depositing User:	Mrs SK Pratibha
Date Deposited:	21 Aug 2018 08:37
Last Modified:	21 Aug 2018 08:37
URI:	http://nal-ir.nal.res.in/id/eprint/12952

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