Preparation Of Casting Lattice Sandwich And Study On Mechanical Properties

In this paper, the theory of structural mechanics and theoretical mechanicswere used to establish the relationship between the mechanics performance oflattice sandwich plates and their structure parameters. The mechanics performanceincludes pressure and shear properties. The Sandwich board types include pyramidtype, tetrahedral and lattice sandwich board Kagome. The structure parameters ofsandwich boards include the length or width of sandwich panel board W, panelthickness h, core bar height h, length of core bar L, the diameter of the core bar R,inclined angle of the core bar and panel ωand the size of the unit cell B.Sandwich panel was simulated by finite element analysis software ANSYSwith the theoretically calculated flat load and the stress distribution under shearloading, analyzing stress distribution of the top panel of sandwich boards and corebar. Two different types of gating system are designed, under which sandwich panelKagome were made with the investment casting method.In addition, equivalent flat compressive modulus and strength of latticesandwich boards are proportional to the relative density of core through theestablishment model, and equivalent flat pressure modulus and quadruplicateinclined angle sine of the core and the panel are in the direct ratio. The equivalentflat crush strength is directly proportional to the quadratic of the sine, andequivalent compressive modulus and strength of three kinds of the structures are atthe same expression. The equivalent transverse shear modulus and intensity of thelattice sandwich board are proportional to the relative density of the core, andequivalent transverse shear modulus is proportional to the square of the inclinedangle sine. The equivalent lateral shear strength is proportional to the sine value ofω.In the equivalent flat compression strength and shear strength model whenintroducing the stress concentration factor, the simulation results showed that, if thepanel is rigid, the equivalent flat compression strength of tetrahedral，Kagome andPyramid type lattice sandwich plates were3times,2.5times and3times of theactual equivalent flat compression strength; the equivalent shear strength oftetrahedral，Kagome and Pyramid type lattice sandwich plates were3times,1.6times and3.2times of the actual equivalent shear strength.Under the flat crush load the maximum stress of the tetrahedral and thepyramid of sandwich board is located in the joint of the bar and the panel, maximumstress of sandwich board Kagome type changed with the change of the thickness of the panel, is located in the link of the bar and panel when the panel is thinner, whichis in hinge parts of the bar when the panel is thicker, under shear loading themaximum stress of three kinds of the structure is located at the connection part ofthe tensile bar and the panel.Preparing Kagome lattice sandwich plates by investment casting, theircompression strength was coinciding with simulation results.