抄録
An evaluation method for fatigue damage of FRP (Fiber reinforced plastics) has been investigated by measurement of crack amount on specimen surface. Using SMC (Sheet molding compound), a kind of FRP, tensile-tensile fatigue test with approximately 1Hz cycle has been carried out. For dispersion of a value, evaluation for an individual crack such as number of cracks, mean length of cracks and crack length distribution are not suited for specification of a damage state. Although using comprehensive method like crack density, there are little difference of increase tendencies by various stress level. Based on this result, it is concluded that fatigue damage state can be specified by measurement of crack density.
