Key Laboratory of Pressure System and Safety, MOE, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
Key Laboratory of Pressure System and Safety, MOE, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
Mater Sci Eng C Mater Biol Appl. 2015 Oct;55:448-56. doi: 10.1016/j.msec.2015.05.074. Epub 2015 Jun 1.
Cyclic microindentations were performed on the occlusal surface and axial section of tooth enamel, using the Berkovich indenter. Under the action of a cyclic indentation load, the indenter continuously penetrated into the tooth enamel and reached a quasi-steady state at which the penetration depth per cycle was a constant. At the quasi-steady state, both the amplitude of the indentation depth and the penetration depth per cycle for the cyclic indentation of the axial section are larger than those for the indentation of the occlusal section under the same loading condition. The energy dissipation per cycle consists of two contributions; one is the plastic energy dissipated per cycle due to the propagation of the plastic zone underneath the indentation and the other is the energy dissipation due to the viscous flow during the cyclic indentation. Both the penetration depth and the plastic energy dissipated per cycle at the quasi-steady state are independent of the maximum applied load and increase with increasing the amplitude of the cyclic indentation load.
在牙釉质的咬合面和轴面进行了循环微压痕实验，使用了 Berkovich 压头。在循环压痕载荷的作用下，压头不断地切入牙釉质，并达到准稳定状态，即每个循环的压入深度为常数。在准稳定状态下，轴向循环压痕的压痕深度振幅和每个循环的压入深度都大于相同加载条件下的咬合面压痕。每个循环的能量耗散由两部分组成；一个是由于压痕下的塑性区的扩展而导致的每个循环的塑性耗散能量，另一个是由于循环压痕过程中的粘性流动而导致的能量耗散。准稳定状态下的压入深度和每个循环的塑性耗散能量都与最大施加的载荷无关，并且随着循环压痕载荷的振幅的增加而增加。
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