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

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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.

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Acknowledgments

Authors wish to thank the AR&DB for financially supporting the project. The support and encouragement provided by Mr. Shyam Chetty, Director, Dr. Satish Chandra, Head, STTD, Mr. Sudheendra, Dr. Ramesh Sundaram, ACD, CSIR-NAL are acknowledged. Thanks are also due to scientists and technical support staff members of FSIG-STTD and ACD, CSIR-NAL for their assistance in experimental work.

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Authors and Affiliations

  1. Fatigue and Structural Integrity Group, Structural Technologies Division, CSIR-National Aerospace Laboratories, Bangalore, 560017, India

    A. R. Anilchandra, Ramesh Bojja, N. Jagannathan & C. M. Manjunatha

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  1. A. R. Anilchandra
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  2. Ramesh Bojja
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  3. N. Jagannathan
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  4. C. M. Manjunatha
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Correspondence to A. R. Anilchandra.

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Anilchandra, A.R., Bojja, R., Jagannathan, N. et al. Variable Amplitude Fatigue Testing to Characterize Mode II Delamination in a Polymer Composite. Trans Indian Inst Met 69, 421–424 (2016). https://doi.org/10.1007/s12666-015-0773-8

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  • DOI: https://doi.org/10.1007/s12666-015-0773-8

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