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Effects of fiber orientation on the acoustic emission and fracture characteristics of composite laminates

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Abstract

The effects of fiber orientation on acoustic emission (AE) characteristics have been studied for various composite laminates. Reflection and transmission optical microscopy were used to investigate the damage zone of specimens. AE signals were classified through short time Fourier transform (STFT) as different types: AE signals with a high intensity and high frequency band were due to fiber fracture, while weak AE signals with a low frequency band were due to matrix cracking and/or interfacial cracking. Characteristic feature in the rate of hit-events having high amplitudes showed a procedure of fiber breakages, which expressed the characteristic fracture processes of notched fiber-reinforced plastics with different fiber orientations. As a consequence, the behavior of fracture in the continuous composite laminates could be monitored through nondestructive evaluation (NDE) using the AE technique.

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Acknowledgement

This work was supported by grant No. (R01-2005-000-10566-0) from the Basic Research Program of the Korea Science & Engineering Foundation.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Hanyang University, 1271, Sa-1dong, Ansan-si, Kyunggi-do, 426-791, Korea

    Nak-Sam Choi

  2. Department of Mechanical Design, Graduate School, Hanyang University, 17, Haengdang-dong, Sungdong-ku, Seoul, 133-791, Korea

    Sung-Choong Woo

  3. School of Mechanical and Industrial System Engineering, Kyunghee University, Yongin, 449-701, Korea

    Kyong-Yop Rhee

Authors
  1. Nak-Sam Choi
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  2. Sung-Choong Woo
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  3. Kyong-Yop Rhee
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Correspondence to Nak-Sam Choi.

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Choi, NS., Woo, SC. & Rhee, KY. Effects of fiber orientation on the acoustic emission and fracture characteristics of composite laminates. J Mater Sci 42, 1162–1168 (2007). https://doi.org/10.1007/s10853-006-1445-1

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  • DOI: https://doi.org/10.1007/s10853-006-1445-1

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