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).

本文提出了单个球形突起摩擦系数（COF）的半解析计算模型。它可以预测摩擦副钢∣超高分子量聚乙烯 (PE-UHMW) 和聚甲醛 (POM) ∣ PE-UHMW 的变形摩擦部分 ( μ _def ) 和粘着摩擦部分 ( μ _adh )。实验研究包括未润滑摩擦测试，用于确定总 COF ( μ _tot )，以及使用硅油润滑的测试，从中获得μ _def 。验证试验表明，两种润滑状态都会产生相同的变形，并且计算模型中假设的后角（ ω ）与μ _def之间的关系是有效的。因此，进行了分段球体的摩擦测试，这允许ω的特定变化。

可以得出结论，对于两个配对， μ _def通常意义不大（约 1/3 μ _tot ），而μ _adh的影响在摩擦过程中占主导地位（约 2/3 μ _tot ）。此外， μ _tot随着接触压力的增加而减小，尤其是在低压范围内，并且取决于运动的形式（连续和不连续）。