Selection of the most Suitable CZM Conditions in the Finite Element Strength Prediction of Adhesive Joints
Abstract
The adhesively-bonding technique is widely used in the industry to join components. Strength prediction of these joints with Cohesive Zone Models (CZM) coupled to Finite Element (FE) analyses is one of the most widespread methods, which allows simulation of crack propagation in the adhesive layer. The present study addresses this issue, and more specifically the influence of the damage law shape used to simulate the adhesive layer behaviour in the FE model of single-lap adhesive joints. This procedure enabled an estimation of the damage law influence on the strength prediction under different material conditions. It was showed that the predicted strength of joints with ductile adhesives is highly dependent on the CZM shape, and that the trapezoidal CZM is the best approximation. Conversely, brittle adhesives are accurately modelled disregarding the damage law shape.
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