Strength evaluation of butt joint by stress intensity factor of small edge crack near interface edge

2018 International Conference on Material Strength and Applied Mechanics

材料科学;力学

Sato, T.^1 ; Oda, K.^2 ; Tsutsumi, N.^2

Graduate School of Engineering, Oita University, 700 Dannoharu, Oita

870-1192, Japan^1

Division of Mechanical Engineering, Oita University, 700 Dannoharu, Oita

870-1192, Japan^2

关键词: Adhesive strength;    Bonded dissimilar materials;    Critical stress intensity factor;    Dimensionless stress intensity factors;    Material combination;    Singular stress field;    Strength evaluation;    Stress singularities;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/372/1/012014/pdf
DOI  :  10.1088/1757-899X/372/1/012014

来源: IOP

【 摘 要 】

Failure of the bonded dissimilar materials generally initiates near the interface, or just from the interface edge due to the stress singularity at the interface edge. In this study, the stress intensity factor of an edge crack close to the interface between the dissimilar materials is analyzed. The small edge crack is strongly dominated by the singular stress field near the interface edge. The analysis of stress intensity factor of small edge crack near the interface in bi-material and butt joint plates is carried out by changing the length and the location of the crack and the region dominated by the interface edge is examined. It is found that the dimensionless stress intensity factor of small crack, normalized by the singular stress at the crack tip point in the bonded plate without the crack, is equal to 1.12, independent of the material combination and adhesive layer thickness, when the relative crack length with respect to the crack location is less than 0.01. The adhesive strength of the bonded plate with various adhesive layer thicknesses can be expressed as the constant critical stress intensity factor of the small edge crack.