鹿茸纤维绕孔微结构及仿生研究

扫描电镜观察显示鹿茸皮质层是一种由矿化胶原纤维和胶原蛋白基体组成的层状天然生物陶瓷复合材料。观察也发现在鹿茸皮质层中存在许多微孔洞，而起增强作用的羟基磷灰石纤维是迂回地环绕这些孔洞，构成一种矿化胶原纤维迂回绕孔结构。基于观察的结果，建立纤维迂回绕孔结构和纤维非迂回绕孔结构复合材料细观分析模型，分析比较了纤维迂回绕孔结构和纤维非迂回绕孔结构的断裂强度，结果表明纤维迂回绕孔结构的断裂强度明显大于纤维非迂回绕孔结构的断裂强度。基于实验和分析的结果，用碳纤维和环氧树脂进行了仿生纤维迂回绕孔结构复合材料的制备，并对得到的纤维迂回绕孔结构复合材料与纤维非迂回绕孔结构复合材料进行了断裂强度的比较测试。结果显示纤维迂回绕孔结构复合材料的断裂强度明显大于纤维非迂回绕孔结构复合材料的断裂强度。

Fiber-Rounding-Hole Microstructure of Antler and Biomimetic Research

The observation of scanning electron microscope shows that the cortical layer of antler is a kind of nature bioceramic composite consisting of mineral-collagen fibers and collagen-protein matrix. The observation also shows that there are many micro-holes in the cortical layer and that the strengthening mineral-collagen fibers circuitously round these holes which compose a kind of the circuitously-rounding-hole structure of the mineral-collagen fibers. The analytical models of the composites, respective with the circuitously-rounding-hole and non-circuitously-rounding-hole structures of the fibers are built. The fracture strength of the composite model with the circuitously-rounding-hole structure is analyzed and compared with that of the composite model with the non-circuitously-rounding-hole structure. The analytical result shows that the fracture strength of the composite model with the circuitously-rounding-hole structure is remarkably larger than that of the composite model with the non-circuitously-rounding-hole structure. Based on the results of the experimental observations and model analyses, a kind of biomimetic composite laminate with the circuitously-rounding-hole structure is fabricated with carbon fibers and epoxy resin. The fracture strength of the composite with the circuitously-rounding-hole structure was tested and compared with that of the composite with the non-circuitously-rounding-hole structure. The testing results show that the fracture strength of the composite with the circuitously-rounding-hole structure is remarkably larger than that of the composite with the non-circuitously-rounding-hole structure.