Characteristics of Thermo-Acoustic Emission from Composite Laminates during Thermal Load Cycles

  • Kim, Young-Bok (Department of Mechanical Design, Hanyang University) ;
  • Park, Nak-Sam (Department of Mechanical Engineering, Hanyang University)
  • Published : 2003.03.01

Abstract

The thermo-acoustic emission (AE) technique has been applied for nondestructive characterization of composite laminates subjected to cryogenic cooling. Thermo-AE events during heating and cooling cycles showed a Kaiser effect. An analysis of the thermo-AE behavior obtained during the 1st heating period suggested a method for determining the stress-free temperature of the composite laminates. Three different thermo-AE types classified by a short-time Fourier transform of AE signals enabled to offer a nondestructive estimation of the cryogenic damages of the composites, in that the different thermo-AE types corresponded to secondary microfracturing in the matrix contacting between crack surfaces and some abrasive contact between broken fiber ends during thermal load cycles.

Keywords

References

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