Auckland University of Technology, Auckland, New Zealand.
Sci Rep. 2023 Apr 28;13(1):6953. doi: 10.1038/s41598-023-33946-x.
Closely controlling the mechanical behaviour and characterization of the deflection of a beam structure is a well-known and widely studied engineering problem. The progress in additive manufacturing methods and the possibilities to closely control the material property variations with the controlled placement of materials further widen the opportunities to achieve given beam deflection criteria. The multi-material additive manufacturing solutions suffer from the lack of real engineering material options, and the quality and performance of the printed parts are usually unsuitable for producing functional parts. A novel cellular structured solution is proposed here, which utilises optimisation of geometries of individual cells of a single material structured beam to obtain deflection profiles closely matched with preset conditions under different loading conditions. The cellular geometry of the structured beam is continually altered for searching and converging on the optimal structure of the cells by the covariance matrix adaptation evolution strategy algorithm in an iterative manner. The optimised beam structures could also be physically produced with single material additive manufacturing methods and the experimental and numerical beam deflection responses correlated closely.
精确控制梁结构的挠度的机械行为和特性是一个众所周知且广泛研究的工程问题。增材制造方法的进步以及通过控制材料的放置来实现材料性能变化的可能性，进一步扩大了实现给定梁挠度标准的机会。多材料增材制造解决方案存在实际工程材料选择的缺乏问题，并且打印部件的质量和性能通常不适合生产功能部件。本文提出了一种新型的蜂窝结构解决方案，该方案利用优化单个材料结构梁的单个单元格的几何形状，在不同的加载条件下获得与预设条件非常匹配的挠度曲线。通过协方差矩阵自适应进化策略算法在迭代方式下，蜂窝结构梁的几何形状不断改变，以搜索和收敛到最优的单元格结构。优化后的梁结构也可以通过单一材料增材制造方法进行物理生产，实验和数值梁挠度响应密切相关。
