Quantitative Characterization of Surface Topography Using an Improved Deterministic Method

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2024-11-05 DOI:10.1007/s11249-024-01932-7

Bing Fang, Weibin Huang, Yusheng Luo, Limin Xie, Tianqi Gu

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Abstract

The characteristic parameters, such as curvature radius of asperity, height distribution, and asperity density play a decisive role when studying the contact characteristics of rough surfaces. A new method of asperity definition based on curve fitting and peak refit, named the deterministic method, is proposed in this paper. The real topography of the rough surface is described by the moving least-squares method. And the local maximum of the curve is defined as the asperity, and the local minimum is defined as the valley. To improve the stability of characteristic parameters of the rough surfaces, this method regenerates a new asperity when the asperities are gathered too closely. Both the characteristic parameters obtained by the deterministic method and the spectral moment method are used in two typical elastic–elastoplastic–plastic contact models, to analyze the contact characteristics of rough surfaces. Numerical calculation results show that, compared to the spectral moment method, the deterministic method demonstrates greater consistency across different sampling intervals, indicating lower sensitivity to sampling interval variations. This improves the accuracy and stability of contact performance parameters, validating the effectiveness of the proposed method, which can serve as a feasible approach for analyzing fine contact on rough surfaces.

Graphical Abstract

Abstract Image

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使用改进的确定性方法定量表征表面地形

在研究粗糙表面的接触特性时，粗糙表面的曲率半径、高度分布和粗糙密度等特征参数起着决定性作用。本文提出了一种新的基于曲线拟合和峰值重拟合的表面粗糙度定义方法，即确定性方法。粗糙表面的真实形貌由移动最小二乘法描述。并将曲线的局部最大值定义为凸面，局部最小值定义为凹谷。为了提高粗糙表面特征参数的稳定性，当凸起聚集过密时，该方法会重新生成一个新的凸起。确定性方法和谱矩法获得的特征参数被用于两个典型的弹性-弹塑性-塑性接触模型，以分析粗糙表面的接触特性。数值计算结果表明，与谱矩法相比，确定性方法在不同采样间隔中表现出更大的一致性，表明对采样间隔变化的敏感性更低。这提高了接触性能参数的准确性和稳定性，验证了所提方法的有效性，可作为分析粗糙表面精细接触的可行方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.