Analysis for Three-Dimensional Singular Stress Field at a Vertex of Bonded Interface Edge in Single Lap Joint under Tensile-Shear Load

概要

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Dissimilar material joints are used in industrial products for improving functionality and reducing their weight. However, mechanism of delamination or crack for the dissimilar material joints is not still clarified. It is well known that singular stress occurs at the edge of the interface in the joints due to the mismatch of material properties. The stress on the singular stress field can be expressed by two parameters, i.e. the order of stress singularity and the intensity of stress singularity. In the present paper, an influence of the material properties of the adhesive in the shear lap joint on the intensity of stress singularity was investigated using a three-dimensional boundary element method analysis. Material property of adhesive in the shear lap joint is varied and that of adherend is fixed at Young's modulus 100GPa and Poisson's ratio 0.3. The intensities of stress singularity arranged by the different values of the order of stress singularity are expressed as a power function of the ratio of Young's modulus of adherend to adhesive.