Evaluation of adhesive scarf joint strength by using singular stress field of small interface crack

2018 International Conference on Material Strength and Applied Mechanics

材料科学;力学

Haraga, S.^1 ; Okazaki, N.^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 materials;    Adhesive strength;    Constant values;    Critical stress intensity factor;    Interface corner;    Interfacial cracks;    Material combination;    Singular stress field;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/372/1/012015/pdf
DOI  :  10.1088/1757-899X/372/1/012015

来源: IOP

【 摘 要 】

In the present study, the adhesive strength of scarf joint is examined by using the stress intensity factor of the fictitious small interface crack. The stress intensity factor of small crack near the interface edge is dominated by the singular stress field of the interface corner. In this study, to evaluate the joint strength, small crack is assumed at the interface corner of the scarf joint. The stress intensity factor of the interfacial crack is calculated by changing the thickness of the adhesive layer and the scarf angle. By using the experimental fracture strength of the scarf adhesive joint specimens under tension, the values of the critical stress intensity factor are calculated. From the analysis result, when the combination of adhesive materials and the scarf angle are fixed, the critical stress intensity factors of the small interface crack are constant value irrespective of the adhesive layer thickness. Therefore, the adhesive joint strength can be evaluated as the constant stress intensity factor of small interface crack. In addition, it is possible to evaluate easily the stress intensity factor by using the dimensionless coefficients depending only on the material combination when the crack length is sufficiently smaller than the thickness of the adhesive layer. The effects of adhesive layer thickness and adhesion angle of scarf joint specimen were discussed and the effectiveness of the proposed method was indicated.