有孔FRP板の応力集中と座屈について

概要

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Collapse of a FRP plate reinforced by roving cloth, with a hole, under uniaxial load appears to be caused by stress concentration and buckling in the case of the plate with smaller stiffness value in compression. This paper reports the above properties for the guidance in design and throws light on the interpretation of the mechanism of stress propagation in the fibrous reinforced composite material with a hole.<BR>To find the stress concentration factor and the critical buckling load, both experimental and theoretical approaches are taken. Experimentally the photoelastic coating method is used to analyze the stress distribution around the hole and the direct measurement of displacement along the centre axis on the surface of plate is adopted in the buckling test. On the numerical solutions, the finite element method is applied for the stress distribution and the buckling strength was treated as an eigenvalue problem.<BR>A good agreement is obtained between the results by the above theoretical and experimental methods. However, it is suggested that the analysis based on the assumption of homogeneity leads to a difficulty when applied to the mechanical interpretation about the behaviour of FRP.<BR>For the further precise treatment of the mechanics of FRP, both the effect of finite width and the non-linear behaviour of fibre bundle in orthogonal directions should be considered in future.
社団法人日本材料学会の論文