抄録
Carbon Fiber Reinforced Plastic (CFRP) is composed of electric conductive carbon fibers and electric insulator resin. Many researchers have reported electric resistance change of CFRP due to fiber breakages and electric resistance change due to applied strain for unidirectional CFRP laminates. Piezoresistivity is electric resistance change with applied strain, and many researchers have reported the piezoresistivity of CFRP. There are, however, large scatter in the measured piezoresistivity in the fiber direction even during tensile loading: both positive piezoresistivity and negative piezoresistivity are reported. In the present study, therefore, basic piezoresistivity measurements are performed using specimens made from single-ply and multi-ply laminates using a precise four-prove method. As a result, positive piezoresistivity was obtained for both single-ply and multi-ply specimens and negative piezoresistivity was obtained from a multi-ply specimen without polishing surface
