Numerical model development to predict the process-induced residual stresses in fibre metal laminates

The thermomechanical interactions between the different materials constituting a hybrid laminate make residual stresses arise during the manufacturing process of such laminate. In turn, the residual stresses make the laminate deform as it is extracted from the mould. Cure induced deformation represent a problem for the assembly step, since additional operations are required for allowing the joining of the different components. Therefore, a tool suitable for the calculation of residual stresses and deformation is needed in order to predict them and to implement the necessary remedies. In the present work, a numerical model for the determination of residual stresses is presented and validated through experimental tests. The case study was a notched laminate, in order to emphasize the deformation without altering the thermal cycle experienced in the material. Both numerical and experimental runs highlighted a higher deformation near the vertex of the laminate.

Automated summary

The thermomechanical interactions between different materials in a hybrid laminate create residual stresses during manufacturing, leading to deformation upon extraction. These stresses and deformations pose challenges for assembly, requiring predictive tools for mitigation. In this study, a numerical model was developed and validated for determining residual stresses, emphasizing deformation near the laminate's vertex.