Kaiser effects in acoustic emission from composites during thermal cyclic-loading |
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| Authors: | Nak-Sam Choi Tae-Won Kim Kyoung Y Rhee |
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| Affiliation: | aDepartment of Mechanical Engineering, Hanyang University, 1271, Sa-1dong, Ansan-si, Kyunggi-do 426-791, South Korea;bSchool of Mechanical Engineering, Hanyang University, Sungdong-koo, Seoul 133-791, South Korea;cSchool of Mechanical and Industrial System Engineering, Kyung Hee University, Yongin 449-701, South Korea |
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| Abstract: | Kaiser effects in acoustic emission (AE) behavior of composite laminates under repetitive thermal cyclic-loads are quantitatively analyzed to identify AE source mechanisms. The repetitive thermal loads brought about a large reduction, i.e. an exponential decrease, in AE total ring-down counts and AE amplitudes. It was thought that generation of most thermo-AE events during the first thermal cycle was not caused by crack propagation, but by secondary micro-fracturing due to abrasive contact between crack surfaces. For subsequent thermal cycles, on the other hand, a small number of weak thermo-AE events were generated due to frictional sliding contact. Such behavior of thermo-AE showed different characteristics according to specimen types and the maximum temperature in the thermal load cycles. |
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| Keywords: | Acoustic emission Composites Kaiser effects Thermal cyclic-load Source mechanisms |
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