Effect Of Dislocation Assembly On The Mechanical Performance Of Tandem Honeycombs With Thin Film Interlayer

The NOMEX honeycomb sandwich structure is widely used in the aerospace field,and the tandem honeycomb structure is favored by researchers for its excellent energy absorption ability and controllable deformation sequence.In order to optimize the assembly method structure and enhance the designability of tandem honeycomb,the effects of assembly dislocation on the mechanical properties of tandem honeycomb structures with thin film interlayers were studied through experiments and finite element simulations.First,three structural forms of single-layer honeycomb,double-layer aligned assembly honeycomb,and double-layer misaligned honeycomb were tested through quasi-static out-of-plane compression experiments.The deformation mechanism and response curve of the structure are analyzed.The experimental results show that the double-layer tandem honeycomb can effectively improve the bearing capacity and energy absorption effect by comparing with the single-layer honeycomb structure.The dislocation assembly causes the two layers of honeycomb core to deform at the same time under the influence of the thin film interlayer.Dislocation assembly has higher platform stress than aligned assembly,and it can eliminate the second peak stress,which improves the structure’s load-bearing performance and energy absorption effect.Then,by establishing a detailed finite element model,parametric simulations were performed on the dislocation length,the number of layers,the layer height to estimate the influence of each factor on the compression mechanical response of the tandem honeycomb.Last,a variety of energy impact tests were performed on the tandem honeycomb sandwich structure.The experimental results show that the tandem honeycomb core can effectively improve the impact resistance compared to the single-layer honeycomb core,but dislocation assembly will weaken the impact resistance of the tandem honeycomb sandwich structure.