基于拓扑优化的变密度点阵结构体优化设计方法

Graded-density Lattice Structure Optimization Design Based on Topology Optimization

点阵材料是一种超轻高强的高性能多孔材料,目前主要以等密度构建点阵结构体。在实际情况下,点阵材料的各部分承受着不同的载荷,等密度点阵材料存在性能不能充分发挥的问题。针对上述问题,将拓扑优化引入点阵材料设计中,提出一种基于均匀化方法的多尺度拓扑优化方法,实现了变密度点阵结构体的优化设计,可根据实际载荷设计出最优的变密度点阵结构体,以达到最优性能。以汽车连杆为例,与现有商业软件HyperWorks采用的梁模型点阵优化方法进行对比验证。结果表明,所提出方法优化所得连杆的轻量化效果更好,应力分布更合理。该方法生成的变密度点阵结构有着更优异的性能,更适合变密度点阵结构体的优化设计。

Lattice material is an ultra-light, high-strength, high-performance porous material. At present, the lattice structure is mainly constructed with uniform density. Different parts made of the lattice material are subjected to different loads, which results in a problem that the optimal performance of the lattice material with uniform density cannot be fully achieved. In view of the above problems, a multiscale topology optimization method based on homogenization method is proposed, which realizes the graded-density lattice structure, and the optimal graded-density lattice structure can be obtained according to the actual load to achieve optimal performance. Taking the automobile connecting rod as an example, comparing with the method of beam-model-based lattice optimization from the commercial software HyperWorks, the proposed method has better performance on mass reduction and the stress distribution. Therefore, the method obtains a better-property design, which is more suitable for the optimal design of graded-density lattice structures.