Optimization Design Of Porous Structure And Study On Quasi-Static Flat Pressure And Low Speed Impact Performance

Porous structure has been widely used in construction,aerospace,biomedicine,automotive and other fields because of its high strength,high toughness,impact resistance,light weight and good heat dissipation.Theoretically,the mechanical properties of porous structure can be further improved by optimization,but it is difficult to be optimized directly by current topology optimization methods because of its periodic characteristics and relatively complex configuration.In recent years,the proposition and application of microstructure theory provide a new idea for the topology optimization of porous structure.Therefore,this paper analyzes the quasistatic flat pressure performance of several kinds of common porous structures and their low-speed impact performance under different impact energy conditions,and optimizes the topology of SC structure.The paper first produced four porous structures of SC,BCC-A,BCC-B,and FCC through 3D printing technology.Then,by building four quasi-static compression experimental platforms for porous structures,quasi-static compression tests were carried out on four porous structures SC,BCC-A,BCC-B and FCC,and compression simulation models of four porous structures were established in combination with the finite element software ABAQUS,and the accuracy of the simulation model was verified by combining simulation and experiment.Then,the stress distribution,deformation and energy absorption curves of porous structures with different porosity after quasi-static flattening were analyzed by simulation model.Secondly,the low-speed impact performance of porous sandwich plates is studied.By building a low-speed impact experimental platform for sandwich plates,the lowspeed impact analysis of four types of porous sandwich plate structures of SC,BCC-A,BCC-B and FCC was carried out,and the pit depth and stress distribution in the impact area under different porosity conditions were comparatively studied.Finally,the topology optimization design of SC porous structure is carried out by establishing periodic boundary conditions,and the stiffness optimization design of SC cells of the two design schemes is carried out by using ESO algorithm.According to the results of equivalent elastic modulus solving,static flat compression analysis and quasi-static three-point bending,the influence of different topology optimization design and stiffness optimization design on the mechanical properties of SC porous structures was studied.