Q235钢基体表面微晶玻璃功能梯度涂层接触应力的数值模拟

Numerical Simulation of the Contact Stress of Functionally Gradient Glass-Ceramic Coatings on Q235 Steel

接触应力状态是涂层材料表层破坏、整体分层剥落的重要影响因素。运用有限元软件ANSYS对Q235钢基体表面TiN/LZAS微晶玻璃梯度涂层在法向静载下的接触应力进行了分析,建立了该复合涂层的有限元分析模型,通过比较有限元数值解和Hertz理论解,验证了有限元模型的可靠性,探讨了不同层数和层厚对涂层体系接触应力分布的影响。结果表明:涂层的径向接触应力和Mises应力的最大值均位于接触区域中心处,最大剪切应力位于接触中心附近;涂层层数和厚度对涂层表面径向应力、界面剪切应力和整体Mises应力均有明显影响。模拟分析的结果可以为该复合材料的设计和制备提供一定的理论依据。

The condition of contact stresses is found to be a very influential factor in the coating wear and subsurface delamination. The contact stress of TiN/LZAS glassceramic gradient coatings on Q235 steel was simulated with a normal static load by using commercial software ANSYS. The finite element analysis model of the composites was established. The numerical solution of finite element method and the solution of Hertz theoretical method were compared to verify the reliability of the finite element model. The contact stress in the composite coatings system was calculated based on various the layer numbers and the coating thickness. The results show that the maximum radial contact stress and Mises stress of the coating are located in the contact center, and the maximum shear stress occurs near the center position. The layer numbers and the thickness have significant effects on the surface radial stress, interface shear stress and Mises stress of the composite coating system. The simulation results can provide a theoretical guidance for the design and preparation of the composite in the future.