Numerical And Experimental Research On Buckling And Related Dynamic Properties Of Sandwich Plate

In this paper, structure and composition unit mix of sandwich plates have beendesigned, through finite element three-dimensional solid modeling.We have used acombination methods which include finite element analysis nonlinear buckling anddynamic strain test. In order to research sandwich plate component material changes to itsgeometry and physical parameters constitutive relationship with the dynamic response andbuckling of the impact.First by the shell theory of elasticity, combined with the boundary conditions andgeometric coordination equations to derived sandwich plate hydro-static equilibriumgeneralized equation. Buckling stress expression of rectangular plate is drawn,whichsimply supported at both ends with unidirectional compression.Through FEM nonlinearbuckling analysis, the sandwich plate values of the critical load under unidirectionalcompression or bending has been researched, which changed with skin thichness, cellheight, cell length, cell thickness and material of skin and cell. The study is found, thatcell height, skin thickness and sandwich density are sensitive factors when sandwichplates are compressed. The cell length and height are sensitive factors when sandwichplates are bent.The sandwich mesh density effect the sensitivity of each parameter onthick sandwich plates, which is nonlinear.Through dynamic strain experimental analysis, the majority of the law of finiteelement calculated is verified.Honeycomb sandwich plate compression failure in the formof local and overall buckling is studied by strain of each point changed and load curveanalysis combined with experimental phenomena. The micro-testing machine is used inloaded phased manner, researched comparative study of its buckling failure process forhexagonal honeycomb sandwich panels covering the upper and lower compressionbuckling experiments honeycomb plates. Equivalent theory used to optimize complexsandwich structure modeling and analysis is critical. Analysis and comparison of severalequivalent sandwich plate theory researches combined with the small sample of theDynamic Mechanical performance Analysis(DMA). The experimental equivalentsandwich materials’ testing is discussed and researched methods modulus by experimentalsandwich plate structure modal analysis and finite element method parameter adjustment.The impact of trends in environmental temperature and vibration frequency of workhave been studied in the material properties of hard and soft skin sandwich compositeconstitutive parameters storage modulus and loss factor by DMA. Skin can improvedynamic modulus of soft sandwich composites overall, whose effect is significantly. Metaltable board to improve the flexural modulus of the viscoelastic material has a significanteffect. Skins can inhibit resin large deformation of sandwich plate with increasingtemperature process.By changing the thickness of the table plate, sandwich mesh height,sandwich degreegrid density,cell wall thickness of the sandwich,the sandwich form, table board andsandwich materials. The influence sandwich plate trends of various parameters have beenstudied on the natural frequency, Study found that the natural frequency of the sandwichplate is sensitive to sandwich height and is not sensitive to sandwich density.Thesensitivity of skin thickness varies with different sandwich heights, and then theexperimental modal analysis, which include rectangular and circular plates changed withskin thickness and sandwich heights proves the influence trends of FEM results.