牙本质区域对塑性损伤力学性能的影响研究

Effect of Spatial Variation on the Plastic and Damage Behavior of Human Dentin

牙本质的力学性能随着深度的变化而发生改变。建立了牙本质的塑性损伤模型模拟了牙本质的纳米压痕实验,并解释了纳米压痕实验卸载阶段刚度下降的原因。数值模拟结果表明内层牙本质的屈服强度低于外层和中层牙本质的屈服强度。并且更容易发生损伤。

The mechanical properties of human dentin varied with its spatial locations.A numerical model is adopted to simulate the nanoindentation experiment in order to characterize the plastic and damage mechanical behavior of human dentin.The degradation in the unloading stiffness is also explained.The numerical results show that the magnitude of the yield strength in the inner dentin is lower than that in the middle and outer dentin.and the damage variable.It is also found that more damage occurs in inner dentin compared with the middle and outer dentin.