目的研究在接触载荷作用下，钛基/TiN涂层的应力变化规律。方法利用ABAQUS软件建立可靠有限元模型，分析涂层厚度不同的钛基/TiN涂层系统在球压头作用下的接触应力。结果钛基/TiN涂层系统最大Mises应力出现在距表面约0.4 a ( a为接触半径)处的亚表层或者亚表层附近的界面处。在接触应力和弯曲应力作用下，涂层弯曲变形会影响涂层的径向应力和剪应力分布。结论在接触载荷作用下，涂层内存在接触应力和自身弯曲两种应力作用。分析结果有利于理解钛基TiN涂层的失效机理。
ABSTRACT:Objective To study the stress of TiN coating/Ti alloy substrate system under contact load. Methods A credible fi-nite element analysis model was established based on ABAQUS, and the contact stress of TiN coating/Ti alloy substrate system with different coating thicknesses was analyzed in detail under the normal load of a sphere indenter. Results The maximum Mises stress of TiN coating/Ti alloy substrate system occurred at the sub-surface located about 0. 4a (a is the contact radius) below the surface or at the interface near the sub-surface. Because of the contact and bending stress, the bending deformation of TiN coating affected the radial and shear stress distribution of TiN coating. Conclusion Both contact stress and bending stress were found in the TiN coating/Ti alloy substrate system under contact load, and the results are helpful for understanding the failure mechanism of TiN coating/Ti alloy substrate system.
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