Peng Xianchang, Guo Dongfang, Ding Hanliang, Mu Zhengzhi, Li Bo, Niu Shichao, Han Zhiwu, Ren Luquan
Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, Jilin, 130022, China.
Institute of Structured and Architected Materials, Liaoning Academy of Materials, Shenyang, 110167, China.
Adv Mater. 2025 Feb;37(5):e2410836. doi: 10.1002/adma.202410836. Epub 2024 Dec 11.
Introducing biological structures into materials design is expected to develop strong and tough structural materials. However, multiple interfaces are introduced simultaneously. They are always the weakest part of load transfer, becoming a critical vulnerability and failure-prone area. Here, it is the first found that the chiton achieves superior mechanical properties just by incorporating a unique sinusoidal interlocking interface into cross-lamellar architecture. These special interlocking interfaces make the chiton shell achieve damage delocalization and increase the resistance to crack initiation and propagation. Meanwhile, this "pre-engineered" path significantly increases the travel path of the cracks and balances the strength and toughness under quasi-static and impact loading. Inspired by this, a novel chiton-inspired composite is proposed. Through coupling the cross-lamellar structures and sinusoidal interlocking interfaces, its strength and toughness are increased by 88% and 107% under quasi-static loading, as well as by 17.8% and 52.4% under impact loading, respectively. These unusual interfaces make up the weak point of cross-lamellar structures and provide insights into the longer evolution of structural materials.
将生物结构引入材料设计有望开发出坚固且坚韧的结构材料。然而，同时会引入多个界面。它们始终是载荷传递中最薄弱的部分，成为关键的薄弱环节和易失效区域。在此，首次发现石鳖仅通过在交叉层状结构中引入独特的正弦形互锁界面就能实现卓越的力学性能。这些特殊的互锁界面使石鳖壳实现损伤局部化，并提高了抗裂纹萌生和扩展的能力。同时，这种“预先设计”的路径显著增加了裂纹的传播路径，并在准静态和冲击载荷下平衡了强度和韧性。受此启发，提出了一种新型的受石鳖启发的复合材料。通过耦合交叉层状结构和正弦形互锁界面，其在准静态载荷下的强度和韧性分别提高了88%和107%，在冲击载荷下分别提高了17.8%和52.4%。这些不同寻常的界面构成了交叉层状结构的弱点，并为结构材料的长期演化提供了见解。
