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Through the observation of the microstructure of the longitudinal and transverse sections of the tibia, it is found that the distribution of mineralized collagen fibers is layered. There are many biological micropores in the cross section of the tibia, and the mineralized collagen fibers near the pores bypass the pores in an orderly manner, thereby forming a mineralized collagen fiber circuitous hole structure. According to the observation results, a finite element analysis model of fiber reinforced composites with fiber circuitous hole structure and drilling hole structure is established. The analysis results show that the maximum strain of the drilling hole structure and fiber circuitous hole structure are 6.428e-3 and 3.583e-3, respectively. The maximum strain of the drilling hole structure is about 1.8 times that of the fiber circuitous hole structure under the same load. The results have shown that the fiber circuitous hole structure of tibia has an excellent resistance to deformation, which can effectively improve the toughness of the tibia. The application of the structure to the composite material can effectively improve the strength of the composite material.

Research of Circuitous Hole Structure of Mineral-collagen Fibers in Tibia