Efficacy of a rubber outsole with a hybrid surface pattern for preventing slips on icy surfaces

Yamaguchi, Takeshi; Hsu, Jennifer; Li, Yue; Maki, Brian E.

doi:10.1016/j.apergo.2015.04.001

Cited by 20 publications

(7 citation statements)

References 30 publications

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“…Footwear and flooring properties are widely recognized to influence shoe-floor friction (Blanchette and Powers, 2015a;Iraqi et al, 2018a;Jones et al, 2018;Moghaddam and Beschorner, 2016;Yamaguchi et al, 2015;Yamaguchi et al, 2017). The traction performance of footwear and flooring designs is commonly quantified by the available coefficient of friction (ACOF) using a tribometer (Beschorner et al, 2007;Chang et al, 2001a;Iraqi et al, 2018a;Jones et al, 2018;Wilson, 1990;Yamaguchi et al, 2015;Yamaguchi et al, 2017). The ACOF is calculated from the time-series ratio (F F (t)/ F N (t)) of friction force (F F (t)) and the normal force (F N (t)).…”

Section: Introductionmentioning

confidence: 99%

“…The influence of the time relative to heel contact has been the subject of previous investigation (Chang et al, 2001a;Grönqvist et al, 2003;Strandberg, 1985) yet little effort has been focused on the impact of the time-interval duration on the measured ACOF. The time-interval varies from a single sample (Blanchette and Powers, 2015b;Wilson, 1996) to hundreds of ms (Beschorner et al, 2007;Grönqvist et al, 1989;Iraqi et al, 2018a;Yamaguchi et al, 2015). Currently, little evidence is available to guide the best practice for estimating the ACOF.…”

Section: Introductionmentioning

confidence: 99%

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Influence of averaging time-interval on shoe-floor-contaminant available coefficient of friction measurements

et al. 2020

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Available coefficient of friction (ACOF) is a common metric of footwear traction performance. ACOF is the ratio of friction to normal force, often averaged over a time-interval. The timeinterval needed to achieve repeatable and valid ACOF is unknown. A post-hoc analysis was performed on nine shoe-floor-contaminant combinations to assess the repeatability and bias of data averaged across 4 time-intervals (2 ms, 50 ms, 100 ms, 200 ms) after the target normal force was reached. The ability to predict human slips was assessed for ACOF across these intervals. Differences in repeatability and validity across the four intervals were small. However, statistically significant differences were observed for the shortest compared with the longest interval (lower repeatability yet modestly improved predictive ability). Given the limited impact of time-interval on the results, a shorter interval of 50 ms is recommended to enable testing of smaller floor samples.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of averaging time-interval on shoe-floor-contaminant available coefficient of friction measurements

et al. 2020

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“…A slip is likely to initiate when the friction required (as measured by the RCOF) to sustain gait is greater than the available friction at the contact between the footwear and floor (ACOF) (Burnfield & Powers, 2006; Hanson et al, 1999). ACOF is typically measured using a number of portable mechanical devices such as a drag slip-meter (Powers et al, 2007; Yamaguchi et al, 2015) and variable incidence tribometer (Burnfield & Powers, 2006; Powers et al, 2007); as well as whole-shoe tribometers like the Portable Slip Simulator (Aschan et al, 2005) and the SATRA STM 603 (Blanchette & Powers, 2015). RCOF is measured on dry surfaces by using a force plate during human gait (Beschorner et al, 2016; Cham & Redfern, 2002a; Chang et al, 2011; Hanson et al, 1999; Yamaguchi & Masani, 2016).…”

Section: Introductionmentioning

confidence: 99%

Coefficient of friction testing parameters influence the prediction of human slips

et al. 2018

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Measuring the available coefficient of friction (ACOF) of a shoe-floor interface is influenced by the choice of normal force, shoe-floor angle and sliding speed. The purpose of this study was to quantify the quality of slip prediction models based on ACOF values measured across different testing conditions. A dynamic ACOF measurement device that tests entire footwear specimens (Portable Slip Simulator) was used. The ACOF was measured for nine different footwear-contaminant combinations with two levels of normal force, sliding speed and shoe-floor angle. These footwear-contaminant combinations were also used in human gait studies to quantify the required coefficient of friction (RCOF) and slip outcomes. The results showed that test conditions significantly influenced ACOF. The condition that best predicted slip risk during the gait studies was 250 N normal force, 17° shoe-floor angle, 0.5 m/s sliding speed. These findings can inform footwear slip-resistance measurement methods to improve design and prevent slips.

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“…Ura et al [4] studied temperature's influence on outsole slip resistance. Besides, there have been several studies [5][6][7][8] focused on the effect of outsole pattern. Li et al [6] investigated the effect of depth of outsole pattern on slip resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al [6] investigated the effect of depth of outsole pattern on slip resistance. Yamaguchi et al [7] and Shao-Xun et al [8] studied the relationship of different contact surfaces and the outsole pattern.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of application of finite element method in shoe slip resistance test

Huang¹,

Hu²,

Xu³

et al. 2018

LFJ

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Finite element analysis (FEA) has been widely used in engineering and construction in simulating forces and interactions and its application in footwear have become quite ripe by being researched for over 30 years. The aim of this study was to investigate the slip resistance of the outsole to learn (1) the feasibility of FEA in the test of outsole slip resistance (2) frictional interactions between outsole and contact surface by experiment test and finite element analysis. A static friction tester was used for static slip resistance test and a SATRA STM 603 slip resistance tester was used for dynamic slip resistance test. Outcome showed that value of SCoF was a little bit higher than that of DCoF both in ET and FEA, and value of coefficients obtained in ET was higher. With the increase of COF value, the displacement of outsole decreased while stress of the outsole increased. In conclusion, FEA application is feasible in footwear resistance testing. Stability of the outsole with superior slip resistance is good in both longitudinal and transverse direction. During walking, it has a strong resistance to the slipping tendency to prevent tumble and sprain. KEY WORDS: Finite element model, Coefficient of friction, Slip resistance, Outsole FEZABILITATEA APLICĂRII METODEI ELEMENTELOR FINITE LA TESTAREA REZISTENŢEI LA ALUNECARE A ÎNCĂLŢĂMINTEIREZUMAT. Analiza elementelor finite (FEA) a fost utilizată pe scară largă în domeniul ingineriei şi construcţiilor pentru simularea forţelor şi a interacţiunilor, iar aplicarea acesteia în domeniul încălţămintei are o istorie îndelungată, fiind cercetată de peste 30 de ani. Scopul acestui studiu a fost de a investiga rezistenţa la alunecare a tălpii exterioare pentru a determina: (1) fezabilitatea FEA la încercarea de rezistenţă la alunecare a tălpii exterioare; (2) interacţiunile de frecare dintre talpa exterioară şi suprafaţa de contact prin testarea experimentală şi analiza elementelor finite. S-a folosit un aparat de testare a fricţiunii statice pentru testul de rezistenţă la alunecare statică şi un aparat de testare a rezistenţei la alunecare SATRA STM 603 pentru testul de rezistenţă la alunecare dinamică. Rezultatul a arătat că valoarea coeficientului de frecare în statică (SCoF) a fost puţin mai mare decât cea a coeficientului de frecare în dinamică (DCoF) atât în cazul testării experimentale, cât şi FEA, iar valoarea coeficienţilor obţinuţi în cazul testării experimentale a fost mai mare. Odată cu creşterea valorii COF, deplasarea tălpii a scăzut în timp ce presiunea asupra tălpii a crescut. În concluzie, aplicarea FEA este fezabilă în testarea rezistenţei la încălţăminte. Stabilitatea tălpii cu rezistenţă superioară la alunecare este bună atât în direcţia longitudinală, cât şi în cea transversală. În timpul mersului, talpa are o rezistenţă puternică la tendinţa de alunecare pentru a preveni căderea şi entorsa. CUVINTE CHEIE: model cu elemente finite, coeficient de frecare, rezistenţă la alunecare, talpă exterioară LA FAISABILITÉ D'APPLICATION DE LA MÉTHODE DES ÉLÉMENTS FINI...

show abstract

Efficacy of a rubber outsole with a hybrid surface pattern for preventing slips on icy surfaces

Cited by 20 publications

References 30 publications

Influence of averaging time-interval on shoe-floor-contaminant available coefficient of friction measurements

Influence of averaging time-interval on shoe-floor-contaminant available coefficient of friction measurements

Coefficient of friction testing parameters influence the prediction of human slips

Feasibility of application of finite element method in shoe slip resistance test

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