Parameter Design And Stress Analysis Of High Temperature Alloy Lattice Sandwich Structure

In this paper,it mainly studies the relationship between different panel thickness,different core structure size(core height,core rod radius and the angle between the rod and the panel)and the number of lattice elements on the structural density,flatness and shear performance,optimize the lattice unit parameters.Based on the structural parameters optimized according to the mechanical properties,the heat conduction and thermal coupling stress distribution are analyzed,and the structure is further optimized to achieve the characteristics of light weight and excellent performance.Establish the theoretical calculation model of panel thickness,core structure unit size and number of lattice sandwich units and structural density,flat modulus and shear modulus,and derive the formula of equivalent flat modulus and equivalent shear modulus.At the same time,according to the formula,the equivalent flat modulus is proportional to the thickness of the sandwich panel,the radius of the rod is proportional to the length of the rod,the equivalent shear modulus and the thickness of the sandwich panel,the core radius,the core core and The cosine of the panel angle is proportional to the length of the rod.Using finite element software to simulate and analyze the influence of structural parameters on the flat pressure performance,it is inversely related to the radius of the rod,the thickness of the panel and the number of cells in the lattice,and is roughly inversely proportional to the angle between the rod and the panel of the tetrahedral unit cell.The comparison of the three structures shows that the kagome has the best flat pressure performance;under the shear load,the influence of structural parameters on the shear performance is analyzed,and the law is similar to that under the flat pressure,but the shear stress value is much smaller than the flat pressure,kagome The middle hinge part of the structure is also stress concentration.Among the three structures,the shear performance of the tetrahedral lattice structure is better.The wing rudder operating under high temperature conditions selects the appropriate lattice parameters of the tetrahedral structure according to its size.The thickness of the panel is 3 mm,the radius of the core section is 3 mm,the angle between the long rod and the panel is 55°,and the angle between the short rod and the panel is 50°.The special design of the tetrahedron requires cross-staggering to ensure that the mechanical properties of the structure are equivalent,and the final optimized design achieves the goal of light weight and high strength.