Research And Application Of Mechanical Properties Of Hourglass Lattice Structure Based On Selective Laser Melting

The Aero-Hydrostatic Actuator(Electro-Hydrostatic Actuator)system,as the core system of future large passenger aircraft and advanced fighter aircraft,is the key to intelligent driving of high-end aerospace equipment.The lightweight design of aviation EHA is urgent worldwide.demand.With the rapid development of additive manufacturing technology,many experts and scholars have studied the lattice structure.Lattice structure is a new type of space mesh structure with high specific strength,high specific stiffness,small relative density,light weight and good energy absorption and energy storage.It has wide application prospects in aerospace,automobile manufacturing and other fields.Therefore,this paper studies the mechanical characteristics of hourglass lattice structures and applies them to the lightweight design of aviation EHA low-pressure valve blocks.The research contents of this paper mainly include the following:First,based on the requirements of the SLM manufacturing process,the topology of the hourglass lattice is determined,and a mathematical model is established to analyze the parameters that affect the mechanical properties of the hourglass lattice.Secondly,an hourglass lattice structure with different parameters is established and its mechanical properties are tested.The constitutive relationship of the structure is obtained and the correctness of the mathematical model is verified.Thirdly,the finite element simulation analysis of the hourglass lattice structure was performed.Based on the complexity of the lattice structure,the tedious modeling,and the large amount of finite element analysis calculations,a secondary development and design was performed to realize the fast beam element lattice structure.The establishment of the model successfully reduced the requirements for the computer performance of the finite element analysis.Through the finite element analysis of the lattice structure with different parameters,the mechanical properties and failure forms were obtained,and the correctness was further verified with the experimental results and mathematical models.Finally,the lightweight design of the low-pressure valve block of the aviation EHA was implemented based on the topology optimization technology.At the same time,the hourglass lattice structure was successfully applied to it,and its performance was verified through finite element analysis to meet the working requirements and achieve the aviation EHA.The purpose of lightweighting.