Abstract
Stress distributions in stepped-lap adhesive joints subjected to static tensile loadings are analyzed using a three-dimensional finite-element method (FEM). For establishing an optimum design method of the joints, the effects of adhesive Young's modulus, the adhesive thickness and a number of steps on the interface stress distributions are examined. As the results, it is found that the maximum value of the maximum principal stress σ1 occurs at the butted edge of the adhesive interfaces. The maximum value of σ1 decreases as the adhesive Young's modulus and the number of steps increase, and as the adhesive thickness decrease. In addition, the difference in the stress distributions between the 2-D and 3-D FEM calculations was shown. A method for estimating the joint strength is proposed using the interface stress distributions. For verification of the FEM calculations, experiments were carried out to measure the strains of the adherends and the joint strengths. Fairly good agreements are found between the numerical and the experimental results.
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