Design And Mechanical Properties Analysis Of New Folds Sandwich Structure

In this paper,the origin of the fold sandwich structure is reviewed,and the research status of the fold sandwich structure is summarized and summarized,and a double fold sandwich structure is designed,and the processing technology,the surface compression performance,the impact resistance performance and the bending resistance of the new fold sandwich structure are also designed.First,the preparation of the core structure of the sandwich structure is a very important process.The quality of the core is directly affected by the validity of the test structure.When preparing the core,it is necessary to preheat the mold first,the temperature can not be too low,too low can not make the carbon fiber woven fabric softened,so that if the fiber prepreg is pressed into the mold with strength,the fiber will distort and the resin is not uniform in the prepreg.These problems are very likely to make the structure of the structure.It can drop.Second,the plane compression performance of the sandwich structure.Based on the quasi-static pressure test and Simulation of the new folded structure,the flat and static energy absorption effects of the new sandwich structure are studied.The flat pressure test shows that when the relative density of the core is low,the core is more prone to buckling failure.The load bearing capacity of the load is sharp to almost no bearing capacity.Obviously,the relative density of the core has no advantage.With the increase of the relative density of the core,the thickness of the core is 3 layers of carbon fiber.At the time of cloth,the flat pressure performance of the structure changed.After the structure reached the peak load peak at the early stage,the bearing capacity did not drop so quickly,but fell to half of the original bearing capacity,and the stress level was maintained to the stage of the structure compaction.It can be predicted that the energy absorption characteristics of the new type of folds are excellent under the condition of relative core density.Third,the performance of the sandwich structure in low velocity impact.It is mainly to use the method of experiment and simulation to study the time load curve of the three kinds of relative density of the new sandwich structure under the impact of 5J and 10 J energy,and analyze the law of the curve,the shape of the fracture of the specimen and the condition of the impact failure.Fourth,the structure of the sandwich structure is three point bending.Through the three point bending experimental study of three kinds of sandwich structures with different relative density,it is found that the three point bending properties of the new folded sandwich structure are related to the relative density of the core.When the relative density of the core is small,the main failure mode of the double fold sandwich structure is the buckling of the core panel and the local debonding with the interface between the core and the face.When the relative density of the core is medium to the density of the core,the core is easily tearing at the core and the core at the contact surface,and the debonding is also medium.One of the failure modes of the relative density core is that the core thickness increases,the core strength increases and the ability of the core structure to resist deformation increases at the high density,and the failure mode of the structure is the dislocation or tearing at the contact between the core and the panel,and the local removal of the core and the panel.Sticky.