Study On The Mechanical Properties Of Porous Structure Based On 3D Printing Technology

3D printing is a technique for modeling design by using 3D software,and then using the material to build a technology of physical parts.Compared with traditional material removal(machining)technology,it is a kind of "bottom-up" material accumulation method.The 3D printing technology is especially suitable for the processing and production of small batch and customized parts.The concept of 3D printing began in the late 1980s and our country began to study in the early 1990s.After just over 20 years,this technology has achieved rapid development,and has a promising prospect in many fields such as biomedical engineering,micro-nano manufacturing and aerospace.For some geometric models,3D printing is more economical and faster than traditional processing.Porous structure in the engineering practice has got widely attention and application in recent years,because it has a unique mechanical performance,transmission performance,photoelectric properties,permeability and adsorption.It is widely used in sandwich parts,aircraft landing gear and airborne protection equipment.Many researchers at home and abroad have studied the mechanical properties of porous structural materials by means of theory,experiment or numerical simulation.The research object of this paper is based on the forming and mechanical properties of the porous structure made by 3D printing technology.(1)The mechanical properties of different porous structures are studied under axial force.Establish porous structures with different porosity shape and different porosity,then analyse the change of mechanical properties by the simulation analysis of ANSYS statics.Establish the theoretical elastic modulus model of different porous structure models based on the gibson-ashby formula.(2)The error source and error solution of the porous structure forming process were studied.By using the resin material to print the 3D small sample,measure its size,analyze the causes of size error and adopt optimized solutions to reduce the error.Finally,the model size error is controlled and the porous structure model of resin entity is manufactured.(3)In order to meet the application requirements of the porous structure,the compressive strength and elastic modulus should meet the relevant mechanical requirements under the premise of reducing weight reduce.Apply the compress experiments on the porous structure made by 3D printing technology,we can obtain the change rules and characteristics of compressive strength and elastic modulus,then modify the elastic modulus of Gibson-Ashby by the experimental data.(4)Metal powder material and laser cladding method is used to make the porous parts,in order to prove that the resin porous structure studied in this paper can be made of metal materials,and then apply compression on the experiment,the result shows that it is feasible to validate the elastic modulus calculation formula with experimental data.