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

Author:

Wu Kaijin,Song Zhaoqiang,Zhang Shuaishuai,Ni YongORCID,Cai Shengqiang,Gong Xinglong,He Linghui,Yu Shu-Hong

Abstract

Bioinspired architectural design for composites with much higher fracture resistance than that of individual constituent remains a major challenge for engineers and scientists. Inspired by the survival war between the mantis shrimps and abalones, we design a discontinuous fibrous Bouligand (DFB) architecture, a combination of Bouligand and nacreous staggered structures. Systematic bending experiments for 3D-printed single-edge notched specimens with such architecture indicate that total energy dissipations are insensitive to initial crack orientations and show optimized values at critical pitch angles. Fracture mechanics analyses demonstrate that the hybrid toughening mechanisms of crack twisting and crack bridging mode arising from DFB architecture enable excellent fracture resistance with crack orientation insensitivity. The compromise in competition of energy dissipations between crack twisting and crack bridging is identified as the origin of maximum fracture energy at a critical pitch angle. We further illustrate that the optimized fracture energy can be achieved by tuning fracture energy of crack bridging, pitch angles, fiber lengths, and twist angles distribution in DFB composites.

Funder

National Natural Science Foundation of China

the Strategic Priority Research Program of the Chinese Academy of Sciences

the Fundamental Research Funds for the Central Universities

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

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