円形多重層間剥離と複合材料積層板の圧縮特性(損傷・試験法,OS.14 先進材料の力学)

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Postbuckling behavior of rectangular composite plates with multiple circular delaminations is studied experimentally and numerically. The plate is fixed at its loading edges and simply-supported at its side edges. Embedded circular delaminations are placed at regular intervals in the thickness direction at the plate center. The diameter of the delaminations increases from the top surface to the other surface as usually observed in the impact damage in composite laminates. The effect of size difference of the delaminations on the compressive behavior is investigated. The three-dimensional block element is adopted. The contact problem of the delaminated surface is approximately considered by placing spring elements between the nodes at the upper and lower surfaces of delaminations, which have no resistance in tensile direction and a strong spring constant in compression direction. The numerical results agree with the experimental ones. The buckling load obtained is quite low owing to the existence of the large size delamination near the back surface. The overall structural instability of the plate does not appear until the small size delaminated portions deform significantly. The complex compressive behavior consists of three parts, instability of the delamination of large diameter which does not directly relate to the plate failure, the local instability of the whole delaminated portion, and global instability of the plate, both of which can be a trigger of the failure depending on the interfacial toughness.
一般社団法人日本機械学会の論文
2004-03-03

円形多重層間剥離と複合材料積層板の圧縮特性(損傷・試験法,OS.14 先進材料の力学)

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