牙本质老化对塑性和损伤性能影响分析
太原科技大学, 应用科学学院, 山西太原 030024
| 摘 要： | 随着年龄增长，人的牙本质中的牙本质小管由于矿物质结晶沉积而发生堵塞，因而老年人的牙本质变得透明。牙本质这种微观结构的改变进而引起其力学性质发生改变。此外纳米压痕实验过程中，在压痕点附近应力非常复杂，实验仅能直接得到其弹性力学性质。为研究年龄对牙本质的塑性和损伤等力学性质的影响，本研究采用塑性损伤本构关系，建立了人牙本质有限元模型并模拟了牙本质的纳米压痕实验，数值模拟结果表明随着年龄的增长，牙本质的屈服强度增大。牙本质的能量耗散能力随着年龄的增长而降低，从而导致其断裂韧性下降，这就解释了老年牙本质更容易发生脆性破坏。此外数值结果表明老年牙本质在压痕作用下相对来说更不容易发生损伤。由于损伤的存在，纳米压痕实验卸载的末尾阶段材料刚度下降。 |
| 关 键 词： | 牙本质; 屈服强度; 损伤; 老化 |
| DOI： | 10.57237/j.mater.2022.02.006 |
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收稿日期: 2022-11-29
接受日期: 2023-01-30
在线出版日期: 2023-02-03
Effect of Aging on Plastic and Damage Mechanical Behavior of Dentin
School of Applied Sciences, Taiyuan University of Science and Technology, Taiyuan 030024, China
| Abstract: | Transparency is a common pathology in aged teeth due to the dentin tubules are filled up with mineral crystals. The mechanical properties of dentin are also affected by ultrastructure changed in the aged dentin. Nanoindentation test is a popular technique to assess the elastic mechanical properties of dentin, while it’s difficult to obtain inelastic mechanical parameters since the indenter tip caused a complex stress distribution within dentin. The plastic-damage model incorporating finite element method is adopted to characterize the plastic and damage behaviors of dentin based on the nanoindentation experiments. The numerical simulations indicate that yield strength of dentin increased with aging. The capacity for energy dissipation via inelastic deformation which reflects the materials’ toughness decreases with increase of age. In addition, the numerical simulations also show that the magnitude of damage decreases with aging. The degradation of the unloading stiffness was caused by the damage at beneath the indenter. |
| Keywords: | Dentin; Yield Strength; Damage; Aging |
基金
| 1. | 国家自然科学基金 (11802194) |
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