Micromechanical analysis of human hard-tissued enamel composite materials

• Main Authors: Jyun- Kai Huang, 黃俊凱
• Other Authors: Song-Jeng Huang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/90227535731762311748

碩士 === 國立中正大學 === 機械工程所 === 98 === Most of the natural biomaterials have different functional optimized material structure ; hence , it would be meaningful to understand the secrets of nature and learn from nature to produce bio-inspired materials in the laboratory. Furthermore , the tiny change of material structure would detect the illness or environmental change . Only recently , with the development of nanoindentation instruments , it has been possible to investigate the size , shape and orientation of nanocrystalline microstructural constituent material of bio-hard tissue(such as tooth). Therefore , the mechanical analysis and modeling of nanostructured bio-composite become a very important research topic. This research studies the mechanical behavior of enamel by finite element method. Using the basic mechanical theory of composite material to investigate mechanical problem of bio-tissue by creating different quantity of sheath models in micro-structural enamel. In the result , from micro-structural enamel models , the elastic modulus will be decreased as the quantities of the sheath increased. Secondly , calculating analytical solution of enamel rod model in two dimension was compared with finite element method to proof the correctness of analytical solution.Finally , in the stress analysis of micro-structural enamel , the quantity of sheath was no effect on the trend of stress distributing. It could find that the maxmum shear stress appeared on the interface of enamel rod and sheath , and the fracture would be generated in this place. No matter how the viscoelastic or elastic property of sheath , the stress distributing in the microstructure of enamel is similar.