Tough double-bouligand architected concrete enabled by robotic additive manufacturing

Arjun Prihar, Shashank Gupta, Hadi S. Esmaeeli and Reza Moini ()
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Arjun Prihar: Princeton University
Shashank Gupta: Princeton University
Hadi S. Esmaeeli: Princeton University
Reza Moini: Princeton University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-51640-y

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