Study On Ice Impact Response And Damage Of Metal-Composite Double Wall Structure

With the development of advanced composite material manufacturing technology and the reduction of cost,composite materials have been more and more widely used from the secondary structural parts of aircraft to the main structural parts.In order to understand the damage characteristics of the metal-composite double-wall structure subjected to hail impact,the double-wall structure composed of 2a12 aluminum alloy plate and T700/TDE-85 composite laminate is used as the research object to carry out the test and numerical simulation work.The effects of different parameters on the ice impact resistance of the double wall structure were studied.The main research contents of this paper include:(1)A high-speed ice impact test was carried out for the double-wall structure of metal-composite materials.The high-impact impact test of four impact energy levels was carried out on the double-wall structure using the air gun system.The impact process of the ice hockey and the response process of the test piece were recorded by high-speed camera and displacement sensor,and the double-layer board under different impact speeds was compared.The displacement of the impact point and the variation of the pit depth at the impact point,and the internal damage detection of the laminate by non-destructive testing technology,found that the main damage form of the aluminum alloy plate is the local bulge,and the main damage form of the composite laminate is stratification.For the damage,the test piece using the isotropic laminated plywood has better anti-ice ball impact performance.(2)Numerical simulation analysis of high-speed ice impact test by finite element software ANSYS/LS-DYNA,using eight-node solid mesh to establish test piece model,aluminum plate adopts Johnson-Cook damage model,laminated plate adopts Hashin failure criterion In the continuous damage model,a cohesive unit model is also introduced between the layers of the laminate to simulate the interlayer damage of the laminate.In addition,a finite element model of ice hockey was established using the SPH method,and a strain rate-dependent material model of ice was used.The effectiveness of the model was verified by comparison with the impact-time curve of the impact center,the deformation curve of the aluminum alloy plate and the delamination damage morphology of the laminate.(3)Applying the experimentally validated finite element model to change the impact energy of ice hockey,the thickness of the metal plate,the spacing of the siding and the lamination of the laminate,and study the influence of different parameters on the ice-impact response and damage of the double-wall structure.In this paper,the dynamic response and damage law of double-wall structure under ice impact are obtained by studying the ice impact damage and simulation analysis method of metal-composite double-wall structure,which provides reference for the design of metal-composite composite structure in the future.