Various composites are increasingly used in civil engineering field. But, interlaminar delamination and interfacial debonding between the fiber and matrix, lead to brittle fracture. We employ an FEM analysis using analytical averaging method based on the Mori-Tanaka theory, and explain phenomena in experiments numerically. As for criteria of the brittle debonding, we employ the interfacial debonding as well as the interlaminar delamination. The ultimate states of the beams are predicted and compared with experimental results of FRP girders in bending test.

Key Words : composites, delamination, debonding, Mori-Tanaka theory, averaging method

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