Laser powder bed fusion of bio-inspired honeycomb structures: Effect of twist angle on compressive behaviors

• Published in: Thin-walled structures Vol. 159; p. 107252
• Main Authors: Lin, Kaijie, Gu, Dongdong, Hu, Kaiming, Yang, Jiangkai, Wang, Haoran, Yuan, Luhao, Shi, Xinyu, Meng, Liang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2021
• Subjects: Bio-inspired structure; Compressive behaviors; Energy absorption; Finite element simulation; Honeycomb structure; Laser powder bed fusion; Laser powder bed fusion; Compressive behaviors; Bio-inspired structure; Honeycomb structure; Energy absorption; Finite element simulation
• ISSN: 0263-8231; 1879-3223
• DOI: 10.1016/j.tws.2020.107252

In this study, novel honeycomb structures with twisted feature were designed and manufactured by laser powder bed fusion (LPBF). The manufacturability, microstructure evolution of LPBFed honeycomb components with twisted feature were studied. The influence of twist angle on the compressive behavior of components was experimentally investigated and the underlying mechanism was revealed using FE simulation. Results revealed that the material relative density of LPBFed components was reduced with the increase of twist angle, caused by the enlarging overhanging area. Different cooling rate of melt pool at different parts along the building direction resulted in different microstructures. The twist angle significantly affected the compressive behaviors of honeycomb structures. When the cell number along each side was 3, the honeycomb structure with 30° twist angle exhibited the most uniform stress distribution under compression, leading to the highest specific compressive strength and energy absorption ability. The influence of cell number and wall thickness on compressive properties of honeycomb structures with 30° twist angle were investigated through finite element simulation, and results revealed that the structure with 0.75 mm wall thickness and 3 unit cells along each side showed the highest specific energy absorption ability. •Bio-inspired honeycomb structures with twist feature were designed and made by LPBF.•The effect of twist angle on microstructures of LPBFed components was studied.•The compression behaviors of components with different twist angle were studied.•FE simulation was used to study stress distributions of structures under compression.