2024-08-30 プリンストン大学
＜関連情報＞
- https://engineering.princeton.edu/news/2024/08/30/special-twist-makes-cracking-easier-resist
- https://www.nature.com/articles/s41467-024-51640-y
ロボットによる積層造形で実現した、強靭なダブル・ブーリガンド構造コンクリート Tough double-bouligand architected concrete enabled by robotic additive manufacturing
Arjun Prihar,Shashank Gupta,Hadi S. Esmaeeli & Reza Moini
Nature Communications Published:29 August 2024
DOI:https://doi.org/10.1038/s41467-024-51640-y
Abstract
Nature has developed numerous design motifs by arranging modest materials into complex architectures. The damage-tolerant, double-bouligand architecture found in the coelacanth fish scale is comprised of collagen fibrils helically arranged in a bilayer manner. Here, we exploit the toughening mechanisms of double-bouligand designs by engineering architected concrete using a large-scale two-component robotic additive manufacturing process. The process enables intricate fabrication of the architected concrete components at large-scale. The double-bouligand designs are benchmarked against bouligand and conventional rectilinear counterparts and monolithic casts. In contrast to cast concrete, double-bouligand design demonstrates a non-brittle response and a rising R-curve, due to a hypothesized bilayer crack shielding mechanism. In addition, interlocking behind and crack deflection ahead of the crack tip in bilayer double-bouligand architected concrete elicits a 63% increase in fracture toughness compared to cast counterparts.
