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Edge Delamination and Residual Properties of Drilled Carbon Fiber Composites with and without Short-Aramid-Fiber Interleaf

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Abstract

Edge delamination is frequently observed in carbon fiber reinforced plastic (CFRP) laminates after machining, due to the low fracture toughness of the resin interfaces between carbon fiber plies. In this study, the effects of incorporating tough aramid fibers into the brittle CFRP system are quantified by measuring the residual properties of bolted CFRP. By adding short-aramid-fiber interleaves in CFRP laminates, the residual tensile strength have been substantially increased by 14 % for twill-weave laminates and 45 % for unidirectional laminates respectively. Moreover, tensile failure was observed as the major mode of toughened laminates, in contrast to shear failure of plain laminates. The qualitative FEM results agreed well with the experimental results that edge delamination would cause relatively higher shear stress and therefore alter the failure mode from tensile failure to shear failure.

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Acknowledgments

The authors are grateful to the financial supports of the National Natural Science Foundation of China (10925209, 11502042 and 91216201), China Postdoctoral Science Foundation (2015 M570244), Program for Changjiang Scholars, Innovative Research Team in University (PCSIRT), 111 Project (B14013) and Fundamental Research Funds for the Central Universities, China.

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Authors and Affiliations

  1. Department of Engineering Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Zhi Sun, Xu Guo, Yupeng Zhang & Haoran Chen

  2. School of Mechanical and Chemical Engineering, University of Western Australia, Perth, WA, 6009, Australia

    Zhi Sun & Xiaozhi Hu

  3. Institute of Traffic and Transportation Engineering, Dalian Jiaotong University, Dalian, 116028, China

    Shanshan Shi

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  1. Zhi Sun
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  2. Xiaozhi Hu
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  3. Shanshan Shi
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  4. Xu Guo
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Correspondence to Zhi Sun or Xiaozhi Hu.

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Sun, Z., Hu, X., Shi, S. et al. Edge Delamination and Residual Properties of Drilled Carbon Fiber Composites with and without Short-Aramid-Fiber Interleaf. Appl Compos Mater 23, 973–985 (2016). https://doi.org/10.1007/s10443-016-9493-4

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  • DOI: https://doi.org/10.1007/s10443-016-9493-4

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