Zhen Zhang,Jun Zhu,Yajie Chu,Zhengnian Chen,Shun Guo,Junqiang Xu
1.School of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing,China
2.Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,Nanjing,China
3.School of Materials Science and EngineeringNanjing University of Science and Technology,Nanjing,China
In nature, shells exhibit remarkable high toughness and impact resistance to the external load despite their brittle main constituent and simple hierarchical structure. In this work, the structure of the mussel shell Hyriopsis cumingii is analyzed by scanning electron microscope and atomic force microscope, and the macro/micro compression and impact tests are performed. Results show that the shell has a three-layer structure: an outer cuticle layer, a prismatic layer, and a nacreous layer. The stiffer and load-dependent prismatic layer is conducive to improve the impact resistance of shell structure. Fracture morphology after failure proves that cracks are transgranularly propagated inside the prism and aragonite platelet, and the crack deflection and platelet pullout can effectively lock the stress, thereby eventually improving the impact-resistance and toughness of the shell.
Hyriopsis cumingii shell microstructure macro/micro mechanical property crack propagation
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