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Graphite/Epoxy 적층복합판의 저속충격에 의한 손상거동
옹장우,김재훈,전제춘 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2
Damage behavior of quasi-isotropic circular composite plates of Herculus AS4/3501-6 graphite/epoxy were investigated and the residual compressive strength after impact under low-velocity impact type loads was evaluated. The locations and lengths of damages inside the plate after the impact were calculated by means of a three-dimensional finite element method and compared with the impact test results. Also, the load-deflection curves for impact were used to predict the major damage characteristics of the impact force in the laminated composites.
전제춘,이종수,임영목,정희돈 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.11
The crack closure phenomenon is important in the aspect of effecitve driving force for crack growth. Therefore, the precise measurement of crack closure load is an essential prerequisite for the determination of the effective driving force. In this study, the acoustic emission(AE) technique was employed as one of crack closure measurement methods and the results were compared with those of crack opening displacement method(CD), back face strain gage method(BFS) and surface strain gage method. Results have shown that the intrinsic fatigue Life curve(da/dN vs. ΔK_(eff)) obtained by use of the AE technique vvas best fit with the curve of high stress ratio (R=0.8) test, which implied that the AE technique could be considered as a reliable crack closure measurement method.