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In the present paper, a singular stress field at a vertex in three-dimensional bonded structures is investigated. The order of stress singularity is determined through an eigen analysis using FEM, and then the intensity of singularity is determined using BEM as a function of the thickness of interlayer. It was found that stress values at the vertex reduce with decreasing the thickness of interlayer and stress, σθθ which is related to delamination of interface, reduces to the minimum at γ/h= 0.4 on the interface in a softer interlayer than the adherend, where γ represents a distance from the vertex and h the thickness of interlayer. Furthermore, a ratio of the displacement in loading direction near the stress singularity field to that interior the bonded structure is introduced, and it is demenstrated to be a useful parameter for arranging the singular stress field. Finally, a unified intensity of singularity is determined using a least square method. Once the unified intensity of singularity is known, the intensity of singularity for an arbitrary thickness of interlayer will be estimated using the parameter

nihon kikai gakkai ronbunshū. a

Intensity of Stress Singularity Fields at a Vertex in Three-dimensional Bonded Joints with an Interlayer (1st Report, In Case of a Large Difference of Young's Moduli in Interlayer and Adherend)