College of Physical Education, Kookmin University, Seoul 02707, Korea.
Dooree System Technology Co., Ltd., Seoul 13219, Korea.
Sensors (Basel). 2022 Jul 25;22(15):5525. doi: 10.3390/s22155525.
Mechanical testers have commonly been used to measure the frictional properties of socks. However, the friction values may be susceptible to the level of stretchiness of tested fabrics or human variability. Thus, the aim of this study was to propose a novel method that enables friction measurement of socks in a sock-wearing condition with less human variability effects. Five socks with different frictional properties were chosen. Three experimental ramp tests were performed with an artificial structure shaped like the foot-ankle complex (last) and a ramp tester to quantify the static coefficient of friction (COF) at the foot against sock, at the sock against an insole, and the foot wearing socks against the insole, respectively. The angle where the last slipped while the ramp surface was gradually inclined was used to compute the static COF values for each sock. The reliability was 0.99, and COF values ranged from 0.271 to 0.861 at the foot-sock interface, 0.342 to 0.639 at the sock-insole interface, and 0.310 to 0.614 in the third test. Socks with different frictional properties were successfully distinguished each other. Thus, the suggested protocol could be a reliable option for measuring the static COF values in the tension similar with it found in a sock-waring condition with reduced effects of human variability.
力学试验机常用于测量袜子的摩擦性能。然而，摩擦值可能容易受到测试织物的拉伸程度或人体变异性的影响。因此，本研究旨在提出一种新方法，以便在穿着袜子的条件下进行袜子的摩擦测量，减少人体变异性的影响。选择了具有不同摩擦性能的五双袜子。使用形状像脚-踝复合体（鞋楦）和斜坡试验机的人工结构进行了三个实验斜坡测试，以分别量化脚对袜子、袜子对鞋垫以及穿着袜子的脚对鞋垫的静态摩擦系数（COF）。最后在斜坡表面逐渐倾斜时滑动的角度用于计算每个袜子的静态 COF 值。可靠性为 0.99，在脚-袜子界面的 COF 值范围为 0.271 至 0.861，在袜子-鞋垫界面的 COF 值范围为 0.342 至 0.639，在第三个测试中的 COF 值范围为 0.310 至 0.614。具有不同摩擦性能的袜子可以成功区分。因此，所建议的方案可能是在穿着袜子的条件下测量与张力相似的静态 COF 值的可靠选择，减少了人体变异性的影响。
