単純重ね合わせ接着継手の特異応力場の強さ

概要

論文の詳細を見る
In recent years, single lap joints have been widely used to bond dissimilar material members particularly in aircraft and automobile structures. However, the debonding easily happens at the corner of the single lap joint because of the singular stress, and it is necessary to evaluate the interface strength for the single lap joint. This paper discusses the effects of adhesive thickness and overlap length on the intensity of singular stress fields under arbitrary material combinations. A useful method is proposed for calculating the normalized intensity of singular stress by using FEM with varying the adhesive thickness and overlap length. Here, two problems are considered together by applying the same mesh at the corner for different adhesive thickness or overlap length. Then it is found that the normalized intensity of singular stress is almost independent of mesh size. The normalized intensity of singular stresses are indicated under arbitrary material combinations. The results show that the intensity of singular stress decreases with decreasing adhesive thickness and increasing overlap length. The increment and decrement are different depending on material combinations between adhesive and adherent.