Human walks carefully when the ground dynamic coefficient of friction drops below 0.41

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• 作者：Daniel Tik-Pui Fong ; Youlian Hong ; Jing-Xian Li
• 关键词：Slips and falls ; Injury prevention ; Slipping risk ; Coefficient of friction ; Preventive measures to slips
• 刊名：Safety Science
• 出版年：2009
• 出版时间：December 2009
• 年：2009
• 卷：47
• 期：10
• 页码：1429-1433
• 全文大小：443 K

文摘

This study investigated the available and utilized friction during non-slip gait in level walking, and determined the limit which human starts to walk carefully to adapt to slippery surface. Sixteen floor–footwear-contaminant conditions with different slipperiness (dynamic coefficient of friction, DCOF, from 0.11 to 1.06) were employed. Fifteen harnessed Chinese male performed ten self-paced walking trials in each condition without slips. The utilized friction (COF_u) was obtained from the maximum value of shear to normal ground reaction force ratio during the first 25 % stance. ANOVA and Tukey tests showed three subsets with similar COF_u, and confirmed the hypothesis that the utilized friction drops gradually when the available friction drops below a certain critical limit. Non-linear regression models were applied to the data to determine the COF_u to be 0.20 and the limit of available ground friction which human starts to walk carefully to adapt to slippery surface (DCOF_limit) to be 0.41.