Spew Fillet Effects on Edge Stress Concentration of Composite Adhesive Joints

In this paper geometry effects of different cases of spew fillets on stress distributions and edge stress concentrations reduction in composite adhesive joints are investigated. To support the claim that the presence of a spew-fillet plays a very important structural role as a ‘stress reliever’ at the ends of the overlap zones, finite element analysis in the single lap composite adhesive joint with and without a spew-fillet have been used. Each of common adhesive joints contents two or more adherends and one or two adhesive layer(s). In this research adherends are assumed to be orthotropic laminates, and adhesive layer(s) behaves as an isotropic material. In this paper, at first peel and shear stress distribution diagrams and maximum (edge) stress concentration factors for different cases of spew fillets in the adhesive layer(s) are determined. These models are analyzed by using finite element method in Ansys software, with 2D solid 8 node elements. A mathematical modeling for determining peel and shear stress distributions for composite squared edge adhesive joints are derived. Then maximum (edge) stress concentration factors can applied for this mathematical modeling. Some cases of these results are validated with, mathematical modeling and Mortensen et al. research results.

کلیدواژه ها:

adhesive joint ، spew fillet ، composite ، stress concentration