Numerical Simulation On The Hybrid Fibre Reinforced Sandwich Structure Under Static Loading

Foam-cored sandwich panel as a bearing structure has been widely used in aviation, aerospace, automobile and other fields for its superior performance such as impact-energy absorption, sound absorption, noise reduction etc., especially for the application in worship building. In which, Sweden VISBY class cruiser and the U.S. Seawolf-class attack nuclear submarine could be successful examples. In this paper, we studies the mechanical properties of a new-type hybrid fiber reinforced sandwich structure with metal core.By re-development basing on the finite element software (ABAQUS) user subroutine UMAT, First, the mechanical properties of aluminum foam material under compression, tension and shear loads was simulated, the obtained results coincide with the literature's results. Second, the failure modes of laminates under the three-point bending load was also simulated with programming user subroutine USDFLD, the modified Hashin criterion was introduced to simulate and compare the bending strengths of carbon fiber laminates and carbon-glass hybrid fiber laminates, respectively. The results show that the carbon-glass hybrid fiber reinforced laminates are superior under three-point bending load.The expressions of stiffness and flexibility of the hybrid fiber-reinforced aluminum foam sandwich structure are derived theoretically, and through both theoretical analysis and numerical simulation, the stiffness and flexibility of carbon fiber-reinforced sandwich structure and hybrid fiber-reinforced sandwich structure were analyzed, respectively.Through contrastively analyzed on the failure of carbon fiber-reinforced and hybrid fiber-reinforced aluminum foam sandwich structure under three-point bending load wtih both theoretical analysis and numerical simulation, the dominant failure modes and the maximum load value were obtained. The results show that for the mechanical performance of flexibility, the carbon-glass hybrid fiber reinforced is better than the carbon fiber reinforeced while in the sandwich structures.