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Delamination Analysis of Carbon Fiber Composites Under Dynamic Loads Using Acoustic Emission

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Abstract

Non-destructive test technique for monitoring delamination failure under complicated loads and environments is still not mature until now. The purpose of this research is to study mixed-mode delamination properties of carbon fiber/epoxy composite laminates under dynamic loads using acoustic emission (AE). Different lay-up specimens with initial intralaminar and interlaminar defects are tested. Two loading modes including single-leg and over-leg three-point bending are applied under dynamic and quasi-static loads. By analyzing the load–displacement curves and the responses of AE characteristic parameters including amplitude and count, effects of the loading speed, loading mode, and lay-up pattern on the delamination initiation and propagation behaviors are studied. Besides, different failure mechanisms are observed by scanning electron microscope. AE results show that the loading speed and mode affect the delamination behaviors of composites distinctly.

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Acknowledgments

Dr. P.F. Liu would sincerely like to thank the support by the National Natural Science Funding of China (No. 51375435), the National Key Fundamental Research and Development Project (No. 2015CB057603), the Natural Science Funding of Zhejiang Province of China (No. LY13E050002), and Aerospace Science and Technology Innovation Funding.

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Authors and Affiliations

  1. Institute of Chemical Machinery and Process Equipment, Zhejiang University, Hangzhou, 310027, China

    X. K. Li & P. F. Liu

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  1. X. K. Li
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  2. P. F. Liu
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Correspondence to P. F. Liu.

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Li, X.K., Liu, P.F. Delamination Analysis of Carbon Fiber Composites Under Dynamic Loads Using Acoustic Emission. J Fail. Anal. and Preven. 16, 142–153 (2016). https://doi.org/10.1007/s11668-016-0068-3

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  • DOI: https://doi.org/10.1007/s11668-016-0068-3

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