Feng Ning, Tie Yuanhao, Guo Ronghui, Yuan Qingwen, Xue Fengling, Li Cheng, Lv Liwen, Xie Weibo
School of Intelligent Manufacturing and Transportation, Chongqing Vocational Institute of Engineering, Chongqing, 402260, China.
Henan Province Engineering Research Center of Ultrasonic Technology Application, Pingdingshan University, Pingdingshan, 467000, China.
Sci Rep. 2023 Nov 30;13(1):21144. doi: 10.1038/s41598-023-48570-y.
The conventional star-shaped honeycomb (CSSH) structure is inherently rich in mechanical properties. Based on the CSSH structure, the Poisson's ratio and Young's modulus can be improved by adding the tip re-entrant angle (ISSH). In this paper, a new concave four-arc honeycomb (CFAH) structure is proposed by designing the straight rod as a curved rod and retaining the tip re-entrant angle from the ISSH structure. The Young's modulus, specific stiffness and Poisson's ratio of CFAH structures are derived from Castigliano's second theorem and Moore's theorem. The theoretical results show good agreement with the numerical and experimental results. The results show that the normalized effective specific stiffness and normalized effective Young's modulus of the CFAH structure are further improved by about 12.95% and 16.86%, respectively, compared with the ISSH structure, and more significant auxiliary effects are obtained. CFAH structures show good promise in aerospace, construction and other applications due to their enhanced mechanical property. Meanwhile, the present work provides guidance for the study of concave four-arc honeycomb structures.
传统的星形蜂窝（CSSH）结构本身具有丰富的力学性能。基于CSSH结构，通过增加尖端凹角（ISSH）可以提高泊松比和杨氏模量。本文通过将直杆设计为曲杆并保留ISSH结构的尖端凹角，提出了一种新型的凹形四弧蜂窝（CFAH）结构。CFAH结构的杨氏模量、比刚度和泊松比由卡斯蒂利亚诺第二定理和摩尔定理推导得出。理论结果与数值和实验结果吻合良好。结果表明，与ISSH结构相比，CFAH结构的归一化有效比刚度和归一化有效杨氏模量分别进一步提高了约12.95%和16.86%，并获得了更显著的辅助效果。由于其增强的力学性能，CFAH结构在航空航天、建筑等应用中显示出良好的前景。同时，本工作为凹形四弧蜂窝结构的研究提供了指导。
