Lattice Design Method Based On Rich Unit Cell

In the past decade,lattice structure applies broadly since it’s good performance at every aspect.Recently,the development of the 3D print makes it possible that made complex lattice structure,since that more and more requirements of complex lattice structure come from industry.However,current lattice structure design method can’t design complex lattice structure.It’s mainly due to they used too simple unit cell which cannot fully satisfy the design requirements.For that,we research the lattice structure design method based on rich unit cell which can satisfy the design requirement better.The main research works of this paper as follow:1.Propose a candidate unit cell generate method which includes multi-level unit cell.Firstly,rules are defined to generate useful unit cell;then,multi-level unit cell generate method is introduced based on those rules.Simple first-level unit cells are generated rapidly,and then more complex second-level unit cell are generated to rich the unit cell.This method generates sufficiently rich candidate cell structure efficiently.2.Propose a high-quality unit cell library generation method.Firstly,a set of selection rules are defined to select good-quality unit cell form unit cell library.Method to calculate the elastic tensor of unit cell rapidly are proposed;then,high-quality unit cell library is formed by select good-quality unit cell from candidate unit cell.This method constructs a unit cell which is quality-guaranteed and has richness but without redundancy unit cell.3.Propose a unit cell selection function and implement lattice structure design which introduced based on topology optimization result.Firstly,select unit cell fill into mesh element to generate lattice structure by topology optimization result and selection function.Then,the response surface method is used to optimize the radius of beam elements.This method optimizes the objective function in lattice structure design effectively.The experimental results show that our method can achieve quality-improved lattice structure by using rich unit cell effectively.