Effects of fiber orientation on the acoustic emission and fracture characteristics of composite laminates
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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.
KeywordsAcoustic Emission Acoustic Emission Signal Acoustic Emission Event Fiber Breakage Acoustic Emission Activity
This work was supported by grant No. (R01-2005-000-10566-0) from the Basic Research Program of the Korea Science & Engineering Foundation.
- 1.Wolters J (1986) In: Proceedings of 2nd international symposium on AE from reinforced composites. The Society of the Plastics Industry, Montreal, pp 29–36Google Scholar
- 3.Suzuki M, Nakanishi H, Iwamoto M, Jinen E, Maekawa Z, Koike K (1987) J Soc Mater Sci Jpn 36:229Google Scholar
- 4.Standard practice for acoustic emission examination of reinforced thermosetting resin pipe (RTRP), ASTM Designation: E1118-00. American Society for Testing and Materials, West Conshohocken, PA, (December 2000)Google Scholar
- 5.Standard practice for acoustic emission examination of fiberglass reinforced plastic resin (FRP) Tanks/Vessels, ASTM Designation: E1067-01. American Society for Testing and Materials, West Conshohocken, PA, (July 2001)Google Scholar