Semi-analytical calculation model for friction of polymers on the example of POM ∣ PE-UHMW and steel ∣ PE-UHMW

IF 6.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Friction Pub Date : 2024-07-29 DOI:10.1007/s40544-024-0887-2

André Bergmann, Jens Sumpf, Niels Dallinger, Martin Moneke, Markus Golder

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Abstract

In this paper, a semi-analytical calculation model for the coefficient of friction (COF) of single spherical protrusions is presented. It allows the prediction of the deformative friction part (μ_def) and adhesive friction part (μ_adh) of the friction pairings steel ∣ polyethylene with ultra-high molecular weight (PE-UHMW) and polyoxymethylene (POM) ∣ PE-UHMW. The experimental studies included unlubricated friction tests, which served to determine the total COF (μ_tot), as well as tests being lubricated with silicone oil, from which μ_def is obtained. Based on the verification tests, it could be shown that both states of lubrication result in the same deformation and that the relationship between the rear angle (ω) and μ_def postulated in the calculation model is valid. Therefore, friction tests with segmented spheres were carried out, which allow a specific variation of the ω.

It can be concluded that for both pairings the μ_def is generally of minor significance (approx. 1/3 μ_tot) and the influence of the μ_adh predominates (approx. 2/3 μ_tot) the friction process. Furthermore the μ_tot decreases with increasing contact pressure especially in the low pressure range and depends on the form of motion (continuous and discontinuous).

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以 POM ∣ PE-UHMW 和钢∣ PE-UHMW 为例的聚合物摩擦半分析计算模型

本文提出了单个球形突起摩擦系数（COF）的半解析计算模型。该模型可以预测钢∣超高分子量聚乙烯（PE-UHMW）和聚甲醛（POM）∣PE-UHMW 摩擦配对的变形摩擦部分（μdef）和粘合摩擦部分（μadh）。实验研究包括无润滑摩擦试验（用于确定总 COF（μtot））和硅油润滑试验（从中得出 μdef）。根据验证试验，可以证明两种润滑状态会产生相同的变形，而且计算模型中假设的后角（ω）和 μdef 之间的关系是有效的。因此，我们用分段球体进行了摩擦试验，允许ω有特定的变化。可以得出结论，对于这两种配对，μdef 一般意义不大（约为 1/3 μtot），μadh 的影响在摩擦过程中占主导地位（约为 2/3 μtot）。此外，μtot 会随着接触压力的增加而减小，尤其是在低压范围内，并且取决于运动形式（连续和不连续）。

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

Friction Engineering-Mechanical Engineering

CiteScore

12.90

自引率

13.20%

发文量

324

审稿时长

13 weeks

期刊介绍： Friction is a peer-reviewed international journal for the publication of theoretical and experimental research works related to the friction, lubrication and wear. Original, high quality research papers and review articles on all aspects of tribology are welcome, including, but are not limited to, a variety of topics, such as: Friction: Origin of friction, Friction theories, New phenomena of friction, Nano-friction, Ultra-low friction, Molecular friction, Ultra-high friction, Friction at high speed, Friction at high temperature or low temperature, Friction at solid/liquid interfaces, Bio-friction, Adhesion, etc. Lubrication: Superlubricity, Green lubricants, Nano-lubrication, Boundary lubrication, Thin film lubrication, Elastohydrodynamic lubrication, Mixed lubrication, New lubricants, New additives, Gas lubrication, Solid lubrication, etc. Wear: Wear materials, Wear mechanism, Wear models, Wear in severe conditions, Wear measurement, Wear monitoring, etc. Surface Engineering: Surface texturing, Molecular films, Surface coatings, Surface modification, Bionic surfaces, etc. Basic Sciences: Tribology system, Principles of tribology, Thermodynamics of tribo-systems, Micro-fluidics, Thermal stability of tribo-systems, etc. Friction is an open access journal. It is published quarterly by Tsinghua University Press and Springer, and sponsored by the State Key Laboratory of Tribology (TsinghuaUniversity) and the Tribology Institute of Chinese Mechanical Engineering Society.