科研之友
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摘要
As adhesive joining becomes widely used in industrial production, the evaluation of adhesive joint strength becomes increasingly important Singular stress fields exist at the extremes of interfaces of adhesive joints. The intensity of singular stress can be used to evaluate the strength of the adhesive joint; however, it is difficult to measure strength directly by the finite element method (FEM) because of the singularity. In this paper, a new method is proposed, in which only the first element stress values at the end of interface were used to obtain the intensity of the singular stress. The method was proved to be valid by comparing the peeling stresses between numerical results and experimental results from other papers. The effects of material combinations and the adhesive thickness on the intensity of singular stress in adhesive joints under tension and bending were discussed. It was found that the change rate of the intensity of singular stress depended on the combinations of adhesive and adherent materials, and the intensity of singular stress increased with increasing adhesive thickness until the adhesive thickness equaled the total width. The joint strengths under tension and bending were compared based on the intensity of the singular stress, and it depended on material combinations, differently from the case of a bonded strip. Moreover, the interaction between singular stress fields in the upper and lower interfaces was also investigated for the adhesive joint with dissimilar adherents.
- 出版日期2015-3
- 单位中国石油大学（北京）
