Abstract
Fracture toughness of multidirectional Carbon Fiber Reinforced Plastics (CFRP) for Mode I and Mode II was investigated using Double Cantilever Beam (DCB), End Notched Flexure (ENF) specimens and Raman Coating Method. The distribution of strain near the crack tip of CFRP was measured by Raman spectroscopy. Thin films of PbO on the measured surface of the DCB and ENF specimens were deposited by physical vapor deposition as the pretreatment to measure the strain by Raman spectroscopy. The fracture toughness of multidirectional CFRP in both Mode I and Mode II was determined using the results measured by Raman spectroscopy. This result coincided with those measured by conventional methods.
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