Ply-Cracking Damage and Nonlinear Deformation of CFRP Cross-Ply Laminate(Special Issue on strength and Fracture, and Experimental Mechanics)

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This paper deals with progressive ply-cracking damage and nonlinear deformation of CFRP cross-ply laminate. Tensile tests in 0°-axis direction and in off-axis direction are carried out on five kinds of CFRP cross-ply laminates which are different in stacking lay-up. Under 0°-axis tension, initiation and evolution of the ply-cracking damage in 90°plies are observed, and corresponding stress-strain relation is slightly nonlinear after the damage. On the other hand, under off-axis tension, the stress strain response exhibits nonlinear deformation, while the ply-cracking damage is not remarkable except for the specimen with large fracture strain. Therefore, it is concluded that the nonlinear deformation of the laminates under off-axis tension is mainly attributed to the nonelastic deformation of the matrix resin. Numerical analyses for the progressive ply-cracking damage and the nonlinear deformation of the CFRP cross-ply laminates are conducted based on a ply-cracking damage theory and a nonlinear lamination theory, respectively, and applicability of these theories are discussed based on the experimental and numerical results.
一般社団法人日本機械学会の論文
2002-10-15