Friction Analyses of Dimple-Structured Surface
Friction Analyses of Dimple-Structured Surface
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DOI：
10.17265/2159-5275/2016.06.001
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
R. Stoeterau;A. Janssen;G. Mallmann
中科院分区：
文献类型：
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作者：
R. Stoeterau;A. Janssen;G. Mallmann
本文研究了润滑条件下激光工程表面的影响。在高速钢AISI H13圆盘表面激光加工出直径100 μm、深度25 μm的半球形凹坑，并在表面施加三种不同的分布密度。通过使用由AISI 440C和碳化钨ISO K20销制成的计数器体进行销盘实验。实验结果为微坑分布对摩擦系数的影响提供了数据信息。进行了数值模拟，以了解销和盘的表面粗糙度对接触问题的影响。结果表明，设计的凹坑结构表面依赖于9个主要参数：材料接触副及其各自的硬度，杨氏模量，表面的粗糙度，凹坑设计，凹坑分布，施加的载荷，速度和类型的润滑剂。通过对这些参数的折衷，可以获得更好的性能，并且凹坑浓度相对于其他参数具有优势。在较高的速度和载荷下，在较低的凹坑浓度下获得最佳结果。数值模拟也可以用作设计工具，支持有关接触对的凹坑形状和分布以及材料选择的决策。
This paper proposes an investigation of the effects of laser engineering surface with dimple operating under lubrication. Dimples with semi-spherical geometry, with 100 μm in diameter and 25 μm in depth, were Laser-machined on the surfaces of high speed steel AISI H13 discs, with three different distribution densities applied over the surface. Pin-on-disc experiments were performed by using counter bodies made with AISI 440C and Tungsten carbide ISO K20 pins. The experiments provided data information on the influence of dimple distribution on the coefficient of friction. Numerical simulations were performed to understand the influence of the pin and disc surface roughness on the contact problem. The results suggest that the design of dimple-structured surfaces rely on nine main parameters: material contact pair and its respective hardness, Young Modulus, the roughness of the surfaces, the dimple design, the dimple distribution, the load applied, the velocity and the type of lubricant. A better performance can be obtained from a compromise solution over these parameters, and the dimple concentration has a dominance over the other parameters. The best results were obtained with a lower concentration of dimples, under higher speed and load. Numerical simulations can also be used as a design tool, supporting decisions regarding shape and distribution of the dimples and material selections for the contact pair.