き裂を含む異種接合材のJ積分

概要

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In this study J-integral of interfacial crack in the bonded joint which was composed of the materials with different mechanical properties was studied by finite element method. J-values of two types of bonded joints under the uniformly tensile stress and the three-point bending load were studied. One type was the bimaterials joint, in which the material B was bonded directly to the material A, and the other type was the trimaterials joint, in which the material B was bonded to the material A by using the insert material C. The obtained results were as follows ;(1) It was clarified that the normalized J-values of bimaterials joint, J/J_<A=B>, were able to be determined only by the ratio of Young's modulus of both materials, E_A/E_B, and J-values were hardly affected by Poisson's ratio. J_<A=B> was the J-value of same material joint.(2) J-values of trimaterials joint were affected by the thickness of insert materials, d, and the ratio of Young's modulus of each materials, E_A/E_B and E_c/E_B. The equation for calculating J-values of trimaterials joint under any loading condition was derived as shown as the next equation.[numerical formula] where J_a : J-integral value of bimaterial (material A and material B) J_b : J-integral value of bimaterial (material C and material B) d_o : Ligament length d : Thickness of insert material
社団法人溶接学会の論文
1992-08-05