Modelling Three-Dimensional Effects in Single-Lap Bonded Joints using Interface Finite Elements

摘要

In this work, a new three-dimensional finite element model for studying the behaviour of adhesive bonded joints is presented. The model includes interface finite elements compatible with three-dimensional solid elements, which were formulated by using the penalty function method. These elements were used to study the mechanical behaviour of single-lap bonded joints. Using these numerical tools, one can obtain the three-dimensional stress state inside the adhesive and at the interfaces between the adhesive and the adherents, which are considered critical regions of the joint. Two different analyses were performed. The linear elastic analysis demonstrated the existence of stress concentrations in the adhesive, near the interfaces. This can explain the occurrence of adhesive failures in joints with well-prepared surfaces. The geometric and material nonlinear effects were also studied. The elasto-plastic analysis showed a general decrease of stress concentrations relatively to the linear case.