Strength improvement of adhesively-bonded scarf repairs in aluminium structures with external reinforcements

摘要: Abstract Adhesively bonded techniques are an attractive option to repair aluminium structures, compared more traditional methods. Actually, as a result of the improvement in mechanical characteristics adhesives, adhesive bonding has progressively replaced joining There several configurations, single-strap, double-strap and scarf. Compared with strap repairs, scarf repairs have advantages higher efficiency absence aerodynamic disturbance. The is caused by elimination significant joint eccentricities repairs. Moreover, stress distributions along bond length uniform, due tapering edges. main disadvantages this technique difficult machining surfaces, associated costs requirement specialised labour. This work reports on experimental numerical study tensile behaviour two-dimensional (2D) structures ductile epoxy Araldite® 2015. analysis, Finite Elements (FE), was performed Abaqus® used cohesive zone models (CZM) for simulation damage onset growth layer, thus enabling strength prediction A parametric angle (α) different configurations external reinforcement (applied one or two sides repair, also lengths). obtained results allowed establishment design guidelines repairing, showing that use reinforcements enables increasing α equal recovery, which makes procedure easier. accurate predicting repairs’ strength, its optimisation purposes.