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研究了振动载荷作用下金属涂层中纳米微痕对其阻尼影响机理,采用LAMMPS分子动力学模拟软件对理想结构金属涂层和含纳米微痕涂层进行模拟计算,求得振动作用下各模型的应力-应变关系曲线及含纳米微痕涂层模型的总能量、微观结构变化。通过两个模型的应力-应变关系曲线对比分析了不同结构模型的阻尼性能,并通过能量和微观结构变化,进一步探讨了纳米微痕对涂层阻尼影响的机理。结果表明:纳米微痕周围的位错、空位及弯结对的变化增强了涂层的阻尼性能,并且纳米微痕未发生扩展破坏。
The mechanism of the influence of nano-marks on the damping of metal coating under vibration load was studied. The LAMMPS molecular dynamics simulation software was used to simulate the ideal structure of metal coating and nano-micro-scratch coating. Stress-strain curve and the total energy and microstructure changes of the nanocomposite coating model. By comparing the stress-strain curves of the two models, the damping properties of the different structural models are compared and analyzed. The mechanism of the influence of the nano-marks on the coating damping is further discussed through energy and microstructure changes. The results show that the change of dislocation, vacancy and bent pair around the nano-scratch enhances the damping performance of the coating, and the nano-scratch does not expand and destroy.