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박홍선(Hong Sun Park),이우형(Woo Hyung Lee),금진화(Jin Hwa Keum),최정훈(Jung Hun Choi),구재민(Jae Mean Koo),석창성(Chang Sung Seok) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.10
This study examined how the fracture toughness is affected according to the variation of the initial crack length and the fiber arranged angle using FEA method and experimental method. Therefore, the energy release rates were calculated and compared by J-integral method and VCCT(Virtual Crack Closure Technique). The results of fracture toughness test verified these results. At this time, the locus method was used in order to determine the energy release rate. When the results of FEA were compared with those of experiment, all of those decreased with the increase of angle between load and the fiber arranged direction. The decrease was due to reducing maximum load and stiffness, and the reason of reduction has been judged that the inplane shear stress.