龙虾外骨骼矿化几丁质纤维片旋转结构研究

Vortical Microstructure of Mineral Chitin Fiber Sheets of Lobster Cuticle

扫描电镜观察显示龙虾外骨骼是一种由矿化几丁质纤维层与胶原蛋白质构成的自然生物陶瓷复合材料。其中的矿化几丁质纤维首先构成纤维片,进而矿化几丁质纤维片组成平行于龙虾外骨骼表面的层状结构。观察也发现相邻纤维层中的矿化几丁质纤维片保持一个固定的夹角旋转,构成一种几丁质纤维片旋转结构。建立纤维片旋转结构模型,分析了与龙虾外骨骼断裂韧性密切相关的纤维片旋转结构的拔出力,并将其与纤维片非旋转结构的拔出力进行比较,结果表明纤维片旋转结构的拔出力明显大于纤维片非旋转结构的拔出力,实验验证了模型分析的结果。研究结果为高性能陶瓷复合材料设计提供有益指导。

The observation of scanning electron microscope shows that the cuticle of lobster is a natural bioceramic composite consisting of mineral chitin fiber layers and collagen protein matter. The mineral chitin fiber layers are parallel with the surface of the cuticle and the collagen protein matter is distributed in the layers as the matrix felting the fiber layers. It also shows that the mineral chitin fiber layers are further composed of thin and orderly mineral chitin fiber sheets which are vertical to the fiber layers. The mineral chitin fiber sheets in different fiber layers have different orientations, which compose a fiber vortical microstructure. The maximum pullout force of the fiber vortical microstructure was investigated and compared with that of the fiber parallel microstructure based on their representative models. The results indicate that the maximum pullout force of the fiber vortical structure is markedly larger than that of the fiber parallel structure. The analytical result is experimentally validated. The research results provide profitable guidance for the design of the high-performance ceramic composites.