Experimental study for Mode II Interlaminar Fracture Behavior of Woven Fabric carbon/epoxy Composites

초록

In this study, ENF(end notched flexure) specimens of woven fabric carbon/epoxy was manufactured and three points bending test was conducted according to ASTM D790 for measuring mode II fracture toughness of specimens. Specimens were of dimension 120mm x 20m x 5mm and had 35mm initial crack. The tests were conducted for three specimens. Two lateral lines on 10mm from the both edge imposed on support rollers having 100mm span and displacement having 0.5mm/min rate was given on the center line by loading nose. After tests, mode II interlaminar fracture toughness(GII) of specimens were calculated for NL(NonLinear), 5% offset and Max. load points. Averages of GII for these points were 980.5 J/m2,2769.0J/m2 and 3554.57J/m2, respectively. Fractured surfaces were observed by optical microscope and it was founded that boundaries of fill pattern were damaged by friction.