Abstract
Acoustic Emission behavior has been studied during fatigue tests of GFRP. Notched specimens were prepared from the GFRP sheet used for landing gear door of Boeing 747 jet plane. Specimens were subjected to uniaxial tension-tension fatigue loading at loading rate of 1 Hz. Relationship between the AE behavior and the loading phase was carefully investigated to evaluate the damage accumulation of the specimen. Four stages in AE activity curves were observed. AE activity of each stage exhibited different characteristics in terms of amplitude and energy, and the AE sources could be distinguished by the observation of the AE parameters such as amplitude, energy and duration. Three different types of the fracture surfaces were observed by scanning electron microscope. Different AE characteristic at each fatigue stage corresponded to these different fracture types. It was suggested that AE measurement could be effective for the assessment of damage and the characterization of crack growth process in GFRP under fatigue loading.
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