Optimum dimple diameter for friction reduction with laser surface texturing: the effect of velocity gradient
Optimum dimple diameter for friction reduction with laser surface texturing: the effect of velocity gradient
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DOI：
10.1088/2051-672x/3/4/044001
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发表时间：
2015-12-01
影响因子：
2.7
通讯作者：
Magagnato, Franco
中科院分区：
文献类型：
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作者：
Greiner, Christian;Merz, Tobias;Magagnato, Franco
表面的形态纹理已被证明具有降低摩擦和磨损的高潜力。为了了解不同的速度梯度在纹理化区域上的最佳凹坑直径的效果，我们纹理化的黄铜销与圆凹坑具有直径在20和200 μ m之间。凹坑深度和堆积密度保持恒定。样品进行了测试，在销盘的方式对蓝宝石光盘和实验进行混合润滑下，两个不同的滑动半径。我们的研究结果表明，较大的速度梯度有利于较小的凹坑，而对于较小的速度梯度，较大的凹坑直径是有益的。在计算流体动力学（CFD）模拟中也发现了存在速度梯度的影响的效果。在实验中，摩擦力可以减少高达80%，证明了激光表面纹理（LST）在降低摩擦力和减少二氧化碳排放方面的巨大潜力。
The morphological texturing of surfaces has demonstrated high potential to reduce friction and wear. In order to understand the effect of different velocity gradients over the textured area on the optimum dimple diameter, we textured brass pins with round dimples having diameters between 20 and 200 mu m. The dimple depth and packing density were kept constant. The samples were tested in a pin-on-disc fashion against sapphire discs and experiments were conducted under mixed lubrication and for two different sliding radii. Our results show that larger velocity gradients favor smaller dimples, whereas for the smaller velocity gradients, larger dimple diameters were beneficial. The effect of there being an influence of the velocity gradient was also found in computational fluid dynamics (CFD) simulations. Experimentally, friction forces could be reduced by up to 80%, demonstrating the tremendous potential of laser surface texturing (LST) to lower friction forces and reduce CO2 emissions.