Textured surfaces have been remarkable in improving the frictional performance of sliding contacts, particularly at instances such as boundary or mixed lubrication regimes. This article reports the results of an experimental and numerical study carried out by introducing surface textures in the form of protrusions to investigate its effects on friction performance under a mixed lubrication regime. The surface textures produced by the chemical etching process are tested on the pin on disc test rig by varying area density and height of the texture. In numerical simulation, the modified Reynolds equation (Patir–Cheng flow model) and asperity contact model (Greenwood–Tripp model) are solved for hydrodynamic and asperity pressures, respectively. The results indicate that the experimental measurements are qualitatively in good agreement with numerical predictions. Furthermore, the simulations are performed for different texture shapes by varying texture area density, height, and sliding velocity. The results depict that a maximum friction reduction of 87% with elliptical textures compared to the un-textured case.

中文翻译：

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混合润滑下滑动接触减摩正织构效应的实验与数值研究

纹理表面在改善滑动接触的摩擦性能方面非常显着，特别是在边界或混合润滑方式等情况下。本文报告了一项实验和数值研究的结果，该研究通过引入突起形式的表面纹理来研究其在混合润滑状态下对摩擦性能的影响。通过改变纹理的面积密度和高度，在盘上销测试台上测试化学蚀刻工艺产生的表面纹理。在数值模拟中，修正的雷诺方程（Patir-Cheng 流动模型）和粗糙接触模型（Greenwood-Tripp 模型）分别求解流体动力和粗糙压力。结果表明，实验测量与数值预测在定性上非常吻合。此外，通过改变纹理区域密度、高度和滑动速度对不同的纹理形状进行模拟。结果表明，与无纹理的情况相比，椭圆纹理的最大摩擦减少了 87%。