Dynamic Response Analysis Of Honeycomb Sandwich Structure Under Low-Velocity Impact

With the development of the science and technology, analysis in material,structure and mechanics is becoming deeper,and honeycomb sandwich strcuture has come into our lives as a new developing structure.This new structure has many advantages such as lighter quality,higher strength,higher energy absorption and so on.As it's excellent performance,honecomb sandwich structure is widely used in aircraft industry,automobile industry,civil engineering and packaging engineering.Research of the mechanical proprties of the honeycomb sandwich structure received wide concern.Honecomb sandwich beam perform well in energy absorption under low-velocity impacting load.In this paper, mechanical proprties of honeycomb structure were first analysised,according to Quasi-static compression experiment And then we analysised the honeycomb sandwich beam's dynamic response under low-velocity impact.This part is processed on both experiment and finite element modelling sides.The important results are summarized from the following several aspects:1.Quasi-static compression experiment on honeycomb structure.According to the experiment we have tested honeycomb structure with different sizes and different materials,and the abilities of plastic deformation and energy absorption were also analysised.The result shows that overall compression performance is influenced by the size of the honeycomb structure.The deformation of the larger test specimen under load can be divided into three stages,the buckling first appears at the top of the structure and the yeild load is stable.The smaller test specimen turns to be intergrity damage under the load.2. Low-velocity impact experiment on honeycomb sandwich beam.this experiment is completed by the DHR-9401 Impulsion loading DWTT type tester.The deformation and failure mode of the honeycomb sandwich beam were analysised.Result shows that:under the impact load,the deformation of the honeycomb is much sharper than the skin's.With higher drop height,the damage of the structure spreads.The plastic deformation of the skin spreads in in-plane direction while the plastic deformation of the honeycomb structure spreads in the height direction.3.Numerical analysis combined with the finite element softwear.The deformation of the simulation can fit with the result of the experiment.The von-mises stress distribution and deformation characteristic under the simulation can also prove the dynamic response analysis given by the experiment.