应用内聚力模型研究人牙本质裂纹扩展的升阻能力

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...

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

Objective To study the fracture toughness of human dentin for crack propagation along and perpendicular to the tubular orientation, respectively and identify the anisotropic cracking resistance curve of human dentin. Methods Cohesive zone model and finite element analysis were adopted to study the fracture behavior of human dentin. Results The results show that the fracture toughness of human dentin increase with crack propagation in a certain range, i.e., human dentin exhibits rising crack growth resistance curve. However, the fracture toughness for cracking along the tubular direction is higher than that in its orthogonal direction. Conclusion Human dentin exhibits anisotropic crack resistance behavior. This study indicates that the results based on cohesive zone modeling agree reasonably well with reported experimental results.