Investigation on fatigue of magnesium alloy with and without MAO coat

• 1、College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094

Abstract：To study the influence of microarc oxidation (MAO), the thickness and Young's modulus of microarc oxidation coat and AZ91D magnesium alloy's fatigue life, the method of finite element was used. The result showed that: after MAO, stress mainly gathered on the microarc oxidation coat, the maximal transmogrification was much less than that before MAO. With the increment of the thickness of microarc oxidation coat, the maximal transmogrification and maximal stress decreased, and under the condition of cyclic load, the alternate stress was less and less to be invariable. Under the condition of the invariability of the Poisson's ratio, With the increment of Young's modulus of microarc oxidation coat, the maximal transmogrification decreased, but the maximal stress increased, when under the condition of cyclic load, the alternate stress was higher and higher with the increment of Young's modulus, so the fatigue life was decreased. Under the condition of cyclic load in cavum oris, all the alternate stress listed above was less than the value that the material endurance fatigue limit, It is just say that the value of alternate stress have none essential influence to the fatigue of tooth material. The model will not be destroyed under the cyclic load of infinite times in cavum oris. So the AZ91D magnesium alloy is suitable to be denture material to repal fatigue.

Keywords： Magnesium alloy MAO Fatigue Finite element method