On fracture behavior of inner enamel:a numerical study  

作　　者：Siyong LIU Yuanzhi XU Richeng LIAO Ge HE Li DING Bingbing AN Dongsheng ZHANG 

机构地区：[1]Shanghai Key Laboratory of Mechanics in Energy Engineering,School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China [2]Department of Stomatology,Shanghai Tenth People’s Hospital,Tongji University School of Medicine,Shanghai 200072,China [3]State-owned Changhong Machinery Factory,Guilin 541002,Guangxi Zhuang Autonomous Region,China [4]Shaoxing Institute of Technology,Shaoxing 312074,Zhejiang Province,China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2023年第6期931-940,共10页应用数学和力学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Nos.12072184,12002197,12202257)。

摘　　要：The ingenious hierarchical structure of enamel composed of rods and protein produces excellent fracture resistance.However,the fracture resistance mechanism in the inner enamel is unknown.The micromechanical models of enamel are constructed to numerically analyze the mechanical behaviors of the inner enamel with different decussation angles and different decussation planes.The results show that the manner of crack propagation in the inner enamel,including crack bridging,crack deflection,and crack bifurcation,is determined by both the rod decussation angle and the decussation plane.In the case of the strong decussation plane,the fracture strength and the required energy dissipation with the decussation angles of 15°and 30°are much higher than those without decussation,demonstrating that decussation is an important mechanism in improving the fracture resistance of enamel.The maximum tensile stress of enamel with the decussation angle of 15°is slightly higher than that of enamel with the decussation angle of 30°,illustrating that an optimal decussation angle exists which balances the strength and toughness.The synergetic mechanism of the decussation angle and the decussation plane on the crack propagation provides a new design hint for bionic composites.

关 键 词：finite element calculation rod decussation decussation plane CRACK 

分 类 号：Q66[生物学—生物物理学] R780.2[医药卫生—口腔医学]