Abstract
Mesoscopic fracture toughness of epoxy matrix phase in unidirectional Carbon Fiber Reinforced Plastics (CFRP) in Mode I and Mode II loading was investigated using Double Cantilever Beam (DCB) specimens, End Notched Flexure (ENF) specimens and Raman spectroscopy. The strain distribution near the crack tip in the epoxy matrix phase was measured experimentally. A lead oxide (PbO) thin film was deposited on the measured surface of the DCB and the ENF specimen by physical vapor deposition (PVD) as the pretreatment for Raman spectroscopy. The Mesoscopic fracture toughness of the epoxy matrix phase in CFRP was determined using the measured results. It was also investigated using the Finite Element Method (FEM). These results coincided with macroscopic fracture toughness.
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