複数電極電気抵抗変化の応答曲面を用いたCFRPはく離検出知的構造の開発

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Compression strength and stiffness of laminated CFRP structural components are severely degraded by delaminations. The delaminations are unfortunately invisible or difficult to inspect by naked eyes. This brings significance of development of smart structures for detection of delaminations of CFRP. In the present study, an electric resistance change method is adapted for identifications of delamination crack position and size of CFRP laminates, and possibility of identification of delamination cracks is experimentally investigated by using cross ply laminates. 3-point-bending test are conducted using specimens with multiple electrodes to generate delamination cracks. Firstly, response surface to predict electric resistance change are constructed from measured electric resistance change. Secondary, design of experiments are conducted for inverse problem to predict delamination crack position and size from electric potential changes. Finally, response surface to predict delamination crack position and size are constructed. Using the response surface method with design of experiments, delamination crack position and size are predicted within practical precision without consideration of fracture mechanism.
1999-12-25

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