A STUDY ON THE RESIDUAL BENDING STRENGTH AND IMPACT-INDUCED DAMAGES OF CFRP COMPOSITE LAMINATES

摘要

The purpose of this study is to confirm the decreasing problems of residual bending strength, and the failure mechanisms experimentally when CFRP composite laminates are subjected to foreign object damage (FOD). Composite laminates used in this test are CFRP orthotropic laminated plates, which are stacked with two-interfaces [0_6~0/90_6~0]_(sym) and four-interfaces [0_3~0/90_6~0/0_3~0]_(sym). When the specimen is subjected to transverse impact by a steel ball, the delamination area generated by the impact damage is observed by using the SAM (scanning acoustic-microscope). Also, the fracture surfaces obtained by three-point tending test were observed by using the SEM (scanning electron microscope). Finally, failure mechanisms were investigated based on the observed delamination areas and fracture surfaces.