Kubiak K J, Bigerelle M, Mathia T G, Dubois A, Dubar L
University of Leeds, School of Mechanical Engineering, Institute of Engineering Thermofluids, Surfaces and Interfaces (iETSI), Leeds, United Kingdom; Université de Valenciennes et du Hainaut-Cambrésis, TEMPO EA 4542, Valenciennes Cedex 9, France.
Scanning. 2014 Jan-Feb;36(1):30-8. doi: 10.1002/sca.21082. Epub 2013 Feb 25.
Dynamic evolution of surface roughness and influence of initial roughness (S(a) = 0.282-6.73 µm) during friction and wear processes has been analyzed experimentally. The mirror polished and rough surfaces (28 samples in total) have been prepared by surface polishing on Ti-6Al-4V and AISI 1045 samples. Friction and wear have been tested in classical sphere/plane configuration using linear reciprocating tribometer with very small displacement from 130 to 200 µm. After an initial period of rapid degradation, dynamic evolution of surface roughness converges to certain level specific to a given tribosystem. However, roughness at such dynamic interface is still increasing and analysis of initial roughness influence revealed that to certain extent, a rheology effect of interface can be observed and dynamic evolution of roughness will depend on initial condition and history of interface roughness evolution. Multiscale analysis shows that morphology created in wear process is composed from nano, micro, and macro scale roughness. Therefore, mechanical parts working under very severe contact conditions, like rotor/blade contact, screws, clutch, etc. with poor initial surface finishing are susceptible to have much shorter lifetime than a quality finished parts.
已通过实验分析了摩擦磨损过程中表面粗糙度的动态演变以及初始粗糙度（S(a)=0.282 - 6.73 µm）的影响。通过对Ti-6Al-4V和AISI 1045样品进行表面抛光，制备了镜面抛光表面和粗糙表面（总共28个样品）。使用线性往复摩擦磨损试验机，在经典的球体/平面配置下进行摩擦磨损测试，位移非常小，为130至200 µm。在经历初始快速退化期后，表面粗糙度的动态演变收敛到特定摩擦系统特有的一定水平。然而，这种动态界面处的粗糙度仍在增加，对初始粗糙度影响的分析表明，在一定程度上，可以观察到界面的流变学效应，粗糙度的动态演变将取决于初始条件和界面粗糙度演变的历史。多尺度分析表明，磨损过程中形成的形貌由纳米、微米和宏观尺度的粗糙度组成。因此，在非常恶劣的接触条件下工作的机械部件，如转子/叶片接触、螺丝、离合器等，初始表面光洁度较差，其寿命可能比高质量加工的部件短得多。
