2軸試験による一方向CFRP積層板の強度評価

抄録

In this study, a biaxial test of CFRP laminates was performed to investigate a failure criterion under biaxial loading. The specimens were composed of unidirectional CFRP prepreg sheets and subjected to a tensile load in the fiber longitudinal direction and a compressive load in the fiber transverse direction, respectively. The dedicated test jig was used to perform the biaxial test with a commonly used single-axis testing machine. For the biaxial test, a displacement ratio, which is a ratio of compressive displacement to tensile displacement, was controlled. Then, maximum tensile and compressive stresses were calculated using a constitutive equation with respect to three displacement ratios. From the results of the biaxial test, tensile strength in a fiber longitudinal direction markedly decreased with compressive stress in a fiber transverse direction increased.