Abstract
In this study, an effect of physical surface treatment to mechanical properties for CFRP is focused. Three kinds of sand papers with different grain degrees are used for physical surface treatment to plain woven carbon cloth. DCB (Double Cantilever Beam) test, ENF (End Notched Flexure) test and static bending test for CFRP are conducted. Fracture surface of carbon fiber using SEM (Scanning Electron Microscope) is observed. Static bending testand bending creep test for honeycomb sandwich beam whose surface materials are treated CFRP are also conducted. As a result, fracture toughness and crack propagation resistance under Mode I and Mode II are improved by physical surface treatment. The surface treatment is effective to bending strength and stiffness. The treatment using coarse particle is effective for compressive side, and the fine grain is effective for tensile side. Physical surface treatment improves stiffness and bending creep properties for honeycomb sandwich beam.
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