Deformable hard tissue with high fatigue resistance in the hinge of bivalve Cristaria plicata

• 成果类型: Article
• 署名作者: Meng, Xiang-Sen; Zhou, Li-Chuan; Liu, Lei; Zhu, Yin-Bo; Meng, Yu-Feng; Zheng, Dong-Chang; Yang, Bo; Rao, Qi-Zhi; Mao, Li-Bo; Wu, Heng-An; Yu, Shu-Hong
• 署名单位: Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Hefei University of Technology; Southern University of Science & Technology
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9467
• DOI: 10.1126/science.ade2038
• 发表日期: 2023-06-01
• 页码: 1252-1257
• 关键词: materials science; human enamel; nacre; brittle; bone; mechanisms; BEHAVIOR; fracture; FAILURE

摘要

The hinge of bivalve shells can sustain hundreds of thousands of repeating opening-and-closing valve motions throughout their lifetime. We studied the hierarchical design of the mineralized tissue in the hinge of the bivalve Cristaria plicata, which endows the tissue with deformability and fatigue resistance and consequently underlies the repeating motion capability. This folding fan-shaped tissue consists of radially aligned, brittle aragonite nanowires embedded in a resilient matrix and can translate external radial loads to circumferential deformation. The hard-soft complex microstructure can suppress stress concentration within the tissue. Coherent nanotwin boundaries along the longitudinal direction of the nanowires increase their resistance to bending fracture. The unusual biomineral, which exploits the inherent properties of each component through multiscale structural design, provides insights into the evolution of antifatigue structural materials.