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http://dx.doi.org/10.6108/KSPE.2013.17.2.031

Failure Behavior of Pin-jointed Composites under Hygrothermal Environments  

Kim, Changyu (금오공과대학교 대학원 기계공학과)
Hwang, Youngeun (금오공과대학교 대학원 기계공학과)
Yoon, Sungho (금오공과대학교 기계공학과)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.17, no.2, 2013 , pp. 31-38 More about this Journal
Abstract
This research analyzed the acoustic emission signals collected from the pin loading tests and investigated the effect of hygrothermal exposure on the fracture behavior of the pin-jointed carbon fiber/epoxy composites. The composite specimens include: the Base specimen that has not been exposed to any environments, the RT specimen that has been immersed in room temperature water, and the HT specimen that has been immersed in high temperature water. According to the pin loading test, the RT and the HT specimens showed 2.2% and 13% decreases in the bearing strength compared to the Base specimen, respectively. The analysis of the acoustic emission signals showed different fracture acceleration points for three types of the specimens. Furthermore, for the RT and the HT specimens, the event from the matrix crack signals in the composites decreased. This shows the effect of the hygrothermal conditions on the acoustic emission signals. Additionally, upon investigating the fracture behaviors of the pin-jointed composites, the exposing specimens to hygrothermal environments decreases the interfacial characteristics of the composites.
Keywords
Pin-jointed Composites; Acoustic Emission Signals; Hygrothermal Environments; Bearing Strength;
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