CFRP直交積層板の層内割れ損傷理論と損傷挙動

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This paper deals with initiation and evolution of cracking damage on 90° plies in cross-ply laminate. An energy approach is extended to predict the progressive ply cracking damage and the corresponding nonlinear stress-strain behavior of the cross-ply laminate under multi-axial in-plane loading. In this approach, the stress and strain condition for the progressive damage are determined by equating the decrease in potential energy to the released energy, where the former and latter are estimated from the stiffness reduction due to ply cracking damage and from the mixed-mode critical energy release rate for cracking of unidirectional ply, respectively. This approach provides us with the constitutive relation of cross-ply laminates including the progressive ply cracking damage. Tensile tests and numerical simulation based on the above approach were carried out on five kinds of CFRP cross-ply laminates which were different in stacking lay-up. The obtained results are as follows : (1) The stress-strain response of the laminates is affected by the ply cracking damage. (2) The stress for ply cracking initiation decreases with increasing laminate thickness even if the thickness ratio of 90° plies to 0° plies is constant. (3) The ply cracking damage behavior depends on the lay-up. (4) The above ply cracking damage theory fairly well describes the experimental results.
社団法人日本機械学会の論文
1998-05-25