A new FE Modelling approach to Simulate the Inter-Layer Adherence in Hybrid Sandwich Structures achievable by Additive Manufacturing

This paper introduces a new approach for FE modelling of sandwich structures achievable with filament-based additive processes, able to improve the prediction of their mechanical response when subjected to four-point bending and compressive tests. This method, based on the Cohesive Zone Model, simulates the presence of a cohesive-type contact, usually employed to predict delamination in laminated composites, between specific critical layers of the structure, such as the interface zone between core and face sheets. The validation of the proposed numerical approach was conducted by taking as reference a literature composite sandwich structure, with a Designed for Additive Manufacturing honeycomb core. This framework was reproduced in the Abaqus environment and, according to the standards of the reference paper, compression and bending tests were carried out. By comparing the results achieved with those reported in the reference paper, it can be seen that they are in good agreement with the experimental test data.