Coefficient of Friction Between Pant Fabrics and Seat Covers: An In-Vivo Experimental Study

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL Experimental Techniques Pub Date : 2024-07-13 DOI:10.1007/s40799-024-00733-w

A. Lamsal, T. R. Bush

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Abstract

Shear force at the seat interface has been known to increase the risk of pressure injury (PI) formation in wheelchair users. Understanding the frictional interaction between pant fabric and seat cover fabric in the presence of deformable material (human tissue and seat cushion) is essential to select optimal fabrics to reduce shear force and decrease PI risk. The objective of this work was to evaluate the coefficients of friction between five pant fabrics and two seat covers using human subjects and a novel experimental setup. This experimental set up created a system where participants were able to slide across a seat pan. Shear forces required to pull the participants as well as the normal force on the seat pan were collected for twelve participants. The coefficient of friction was calculated using the force balance from these experimental data sets. The coefficient of friction was higher with the vinyl seat cover common on wheelchairs (0.503–0.572) compared to the office seat cover (0.336–0.448) with all pant fabrics. Furthermore, with the office cover, a substantial drop was observed in the coefficient of friction after sliding, which differed from the vinyl seat cover. This study developed a methodology to study friction behavior at the human-seat interface and quantified coefficients of friction between pant fabrics and two common types of seat covers. It provides a method by which realistic situational shear forces can be studied, as they are a risk factor for PI formation in wheelchair users.

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裤子织物与座椅套之间的摩擦系数：活体实验研究

众所周知，座椅界面的剪切力会增加轮椅使用者形成压力伤害（PI）的风险。了解在可变形材料（人体组织和座垫）存在的情况下，裤子织物和座套织物之间的摩擦相互作用对于选择最佳织物以减少剪切力和降低 PI 风险至关重要。这项工作的目的是使用人体和新颖的实验装置，评估五种裤子织物和两种座椅套之间的摩擦系数。该实验装置创建了一个系统，让参与者能够在椅垫上滑动。收集了 12 名参与者拉动参与者所需的剪切力以及座垫上的法向力。利用这些实验数据集的力平衡计算出了摩擦系数。在所有裤料中，轮椅上常见的乙烯基椅套的摩擦系数（0.503-0.572）高于办公椅套（0.336-0.448）。此外，在使用办公室椅套时，还观察到滑动后摩擦系数大幅下降，这与乙烯基椅套不同。本研究开发了一种研究人座界面摩擦行为的方法，并量化了裤装织物和两种常见座椅套之间的摩擦系数。它提供了一种可以研究实际情况剪切力的方法，因为剪切力是轮椅使用者形成 PI 的风险因素。

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来源期刊

Experimental Techniques 工程技术-材料科学：表征与测试

CiteScore

3.50

自引率

6.20%

发文量

审稿时长

5.2 months

期刊介绍： Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.