Discontinuous fibrous Bouligand architecture enabling formidable fracture resistance with crack orientation insensitivity

• DOI: 10.1073/pnas.2000639117
• Publication Date: 2020-06-23T00:36:45Z
• Authors: Kaijin Wu; Zhaoqiang Song; Shuaishuai Zhang; Yong Ni; Shengqiang Cai; Xinglong Gong; Linghui He; Shu-Hong Yu
• Keywords: 02 engineering and technology; 0210 nano-technology

Significance Inspired by the survival war between “spear” of mantis shrimps with Bouligand-type microstructures and “shield” abalone nacreous staggered architectures, we design an architecture, a combination Bouligand structures, which enables excellent fracture resistance crack orientation insensitivity. The sophisticated hybrid mode due to competition energy dissipations twisting bridging arising in DFB architecture is identified as origin maximum at critical pitch angle. This finding sheds light on how nature evolves materials exceptional toughness provided strategies parameters selection principle enable fabrication formidable fracture-resistant fibrous composite systems that adapt loads various orientations.