目标参数驱动的点阵支架逆向设计方法研究  

Research on the Inverse Design Method of Lattice Structure Driven by Target Parameters

作　　者：纪小刚 方创 王炜 JI Xiaogang;FANG Chuang;WANG Wei(School of Mechanical Engineering,Jiangnan University,Wuxi 214122;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment Technology,Wuxi 214122)

机构地区：[1]江南大学机械工程学院,无锡214122 [2]江苏省食品先进制造装备技术重点试验室,无锡214122

出　　处：《机械工程学报》2023年第23期221-228,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金(52175234,51105175);江苏省“六大人才高峰”(JXQC-006)资助项目。

摘　　要：面向微小多功能支架结构定制设计与原型制造需求,开展了基于数字光处理(Digital light procession,DLP)快速成形工艺的柔弹性点阵支架逆向设计与制备研究。基于体心立方晶胞(Body center cubic,BCC)衍生设计一款簇新胞元,利用Timoshenko梁理论对该胞元结构建立力学模型,求解其等效弹性模量,聚焦分析胞元几何参数与力学模型之间的映射规律。以空间尺寸约束下的定弹性模量点阵支架设计为主线,采用逆向分析方法,寻找匹配精准的填充方案。配制新颖柔弹性光敏树脂为成形材料,选用DLP成形工艺,实现对应点阵支架结构的高精、高效制备。结合数值模拟和物理试验,着重探讨逆向设计的点阵支架弹性模量与拟定值的差异。结果表明,仿真和试验所得结果均与拟定值基本吻合,佐证了逆向设计方法的可靠性,可为后续组织工程皮肤支架的研制提供理论基础。For the custom design and prototyping of micro multi-functional scaffold structure,the inverse design and preparation of flexible elastic lattice structure based on DLP(Digital light procession,DLP)rapid prototyping process was carried out.A new cell is designed based on BCC(Body center cubic,BCC)cell derivation,and the mechanical model of the cell structure is established by using Timoshenko beam theory to solve its equivalent elastic modulus,and the mapping law between the geometric parameters of the cell and the mechanical model is analyzed in focus.The design of the fixed elastic modulus lattice structure under the spatial dimensional constraint is the main line,and the inverse analysis method is used to find the precise matching filling solution.A novel flexible photosensitive resin is configured as the forming material,and the DLP forming process is selected to achieve high precision and high efficiency in the preparation of the corresponding lattice structure.Combined with numerical simulations and physical experiments,this paper focuses on the difference between the elastic modulus of the reverse-designed lattice structure and the proposed value.The results show that the simulation and experimental results are in good agreement with the proposed values,which supports the reliability of the inverse design method and can provide a theoretical basis for the subsequent development of tissue-engineered skin scaffolds.

关 键 词：组织工程支架 逆向设计 柔弹性点阵结构 等效力学模型 DLP成形工艺 

分 类 号：TB34[一般工业技术—材料科学与工程]