Numerical Simulation Study On Dynamic Response Of Aluminum Alloy Fuselage Under Internal Blast-load

Based on the structure of the real aircraft,a simplified model of the cabin was established and the dynamic response under the internal blast-load was studied by numerical simulation.Firstly,according to the experimental model and data in the published literature,the corresponding numerical simulation model was established.The advection steps of Arbitrary Lagrangian-Eulerian Method(ALE),fluid-structure coupling,the number of coupling points,mesh size and type of finite element were studied on the calculation accuracy by parametric analysis method,and the algorithms and parameters for the impact simulation were obtained.Then,the 2024-T3 aluminum alloy flat plate explosion test and the corresponding simulation calculation were designed.The air mesh size,constitutive model and failure parameters of the aluminum alloy material were studied by the combination of experiment and simulation.The constitutive model of the aluminum alloy material was validated and the failure strain of the 2024-T3 was calibrated.Based on these data,the numerical simulation method was used to study dynamic response of 2024-T3 plate.Finally,based on the real aircraft structure,a simplified model of the cabin was established.The dynamic response of the aluminum alloy fuselage under the impact load was studied by numerical simulation and parametric analysis.The deflection,strain,stress and the failure mode of the fuselage were obtained under different working conditions.