应用内聚力模型研究人牙本质裂纹扩展的升阻能力  

STUDY OF RISING FRACTURE TOUGHNESS OF HUMAN DENTIN WITH THE COHESIVE ZONE MODELING

作　　者：安兵兵[1] 张东升[2] 

机构地区：[1]上海市应用数学和力学研究所,上海200072 [2]上海大学力学系,上海200444

出　　处：《固体力学学报》2011年第3期277-281,共5页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金项目(10772111)资助

摘　　要：论文采用断裂力学中的内聚力模型,结合有限元法研究裂纹沿牙本质小管和垂直于牙本质小管扩展的断裂韧度.数值模拟结果表明牙本质的断裂韧度随着裂纹扩展而增大,表现出上升的阻力曲线(R-curve)特性,但裂纹沿牙本质小管扩展的断裂韧度要大于裂纹垂直于牙本质小管扩展的断裂韧度,表现出各向异性的裂纹扩展阻力曲线性质.同时论文的研究也表明内聚力模型能够准确预测牙本质的裂纹扩展行为.The fracture toughness of human dentin for crack propagation along and perpendicular to the tubular orientation were studied using cohesive zone model and finite element method.The numerical simulation shows that the fracture toughness of human dentin increases with crack propagation in a certain range,i.e.,human dentin exhibits rising crack growth resistance curve.However,the fracture toughness in the longitudinal direction is higher than that in transverse direction,which indicates that the resistance curve of human dentin is anisotropic.Our study also demonstrates that cohesive zone model can be used to predict crack propagation behavior of human dentin properly.

关 键 词：内聚力模型 裂纹扩展 R曲线 各向异性 

分 类 号：O346.1[理学—固体力学]