Coated components are often subjected to high strain rate and repetitive contact damage in practical service, so how to quickly evaluate the dynamic contact behavior of the thin protective coating is particularly important. Highly resolved single nano-impact and novel multiple micro-scale impact tests were used to investigate the dynamic hardness and fatigue failure of 0.55–1.52 μm thick graphite-like carbon (GLC) films on 316L stainless steel with varied thickness, respectively. By analyzing the impact depth and velocity before and after the indenter first contact with the sample, the dynamic hardness of GLC film/substrate system was obtained reasonably based on the energy approach in single nano-impact tests. Possible reasons for the higher dynamic hardness than quasi-static hardness include overestimation of the plastic absorbed energy W_p and the strain rate sensitivity of materials. The thickest film/substrate system studied had a higher dynamic hardness than the thinner films due to its higher load carrying capability. Results with the multiple micro-impact technique showed that a GLC film with intermediate thickness (1.1 μm) was more resistant to the impact fatigue, while the thinnest film, 0.55 μm, exhibited more pronounced radial cracks under the indent and the thickest film, 1.52 μm, showed more significant edge ring cracks, these differences resulting from the combined action of stress distribution, film microstructure and mechanical properties.

涂层元件在实际使用中经常会受到高应变率和反复接触损伤，因此如何快速评估薄保护涂层的动态接触行为就显得尤为重要。高分辨率单纳米冲击和新型多微米冲击试验分别用于研究 0.55-1.52 μm 厚的类石墨碳 (GLC) 膜在不同厚度的 316L 不锈钢上的动态硬度和疲劳失效。通过分析压头首次接触样品前后的冲击深度和冲击速度，基于单次纳米冲击试验中的能量方法合理地获得了GLC薄膜/基材系统的动态硬度。动态硬度高于准静态硬度的可能原因包括高估了塑料吸收能量W _p和材料的应变率敏感性。由于其更高的承载能力，所研究的最厚膜/基材系统比更薄的膜具有更高的动态硬度。多重微冲击技术的结果表明，中等厚度（1.1 μm）的 GLC 膜更能抵抗冲击疲劳，而最薄的 0.55 μm 膜在压痕下表现出更明显的径向裂纹，最厚的膜为 1.52 μm，显示出更显着的边缘环裂纹，这些差异是应力分布、薄膜微观结构和机械性能共同作用的结果。