Investigation On The Deformation Failure Characteristics Of Aluminum Alloy Round-Curvilinear-Core Sandwich Plate Under Low-Speed Impact

Corrugated sandwich panel structure,as a lightweight multifunctional structure,has the advantages of light weight and high specific strength and has been widely used in aviation and aerospace.However,the aircraft will inevitably be subjected to various low-velocity impacting during service,and that will significantly reduce the rigidity and residual strength of the structure and affect its ability to resist deformation and damage.At present,domestic and foreign scholars have little research on corrugated sandwich structure,therefore,this paper has carried out low-velocity impact research on 2A12-T4 aluminum alloy round corrugated sandwich panel.The main research contents include:Firstly,the round corrugated sandwich panel specimens were processed by the wire cutting method,and the low-velocity impact performance research of these specimens was carried out based on the drop weight experiments.Meanwhile,the impact positions of the base and the node are considered in the experiments,and the influence of different impact positions on the deformation failure mode of corrugated sandwich panels under low-velocity impact was analyzed.Under the influence of deformation failure mode.The results show that the impact position has a significant effect on the deformation and failure characteristics of the sandwich panel,and the corrugated sandwich panel at the impact node position has better energy absorption performance.Secondly,based on the finite element simulation software ABAQUS and the constitutive relationship and fracture criterion of aluminum alloy,a simulation model corresponding to the experimental conditions was established,and the low-velocity impact response analysis of the corrugated plate node and the base was carried out,and the numerical simulation results are in good agreement with the test results,and the simulation model can be further used for low-speed impact simulation of other impact conditions.Finally,the influence of impact position,punch shape,impact angle and target plate structure on the deformation and failure characteristics of aluminum alloy corrugated sandwich structure under low-velocity impact are analyzed and studied respectively on the impact of the corrugated sandwich structure’s low-speed impact deformation failure characteristics.The results show that the impact position has a significant impact on the impact resistance of the corrugated sandwich panel.With the increase of the impact offset,the perforation energy of the corrugated sandwich panel gradually decreases.The impact resistance of the corrugated sandwich panel is affected by the shape of the punch.When the flat punch impacts the node and the base,the impact resistance of the sandwich panel is the best.The impact angle has an impact on the impact resistance of the corrugated sandwich panel.As the impact angle increases,the perforation energy of the sandwich panel increases,and the impact resistance improves.The target board structure considers the equivalent single-layer board and the sinusoidal corrugated board.And the impact resistance of the equivalent single-layer board is better than that of the circular corrugated sandwich panel,the impact performance is similar.Meanwhile,with the change of the sine period,there is a sine corrugated sandwich structure that is the easiest to perforate.In view of the above rules,the analysis is carried out from the aspects of the deformation failure mode of the sandwich panel,the impact response curve and the perforation energy.In this paper,the effect of different influence factors on the deformation and failure characteristics of aluminum alloy corrugated sandwich structure under low-velocity impact has been comprehensively and systematically analyzed from the aspects of sandwich panel failure and energy consumption.And it has important engineering application value and practical significance for understanding the failure mechanism of corrugated sandwich panels and optimizing structural design analysis methods.