Understanding the Friction Measured by Standardised Test Methodologies Used to Assess Shoe-Surface Slip Risk

Clarke, James; Hallas, Kevin; Lewis, Roger; Thorpe, Steve; Hunwin, G.; Carré, Matt

doi:10.1520/jte20120334

Cited by 8 publications

(2 citation statements)

References 34 publications

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“…However, there is a slight difference between the intended relation and the true measurements. A more precise relation between the BPN and COF is described in Equation 1 ( 33 ).…”

Section: Methodsmentioning

confidence: 99%

Pavement Friction Modeling using Texture Measurements and Pendulum Skid Tester

Alhasan

Smadi

Bou-Saab

et al. 2018

Transportation Research Record

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Pavement frictional behavior affects pavement performance in terms of vehicle safety, fuel consumption, and tire wear. Comprehending and interpreting pavement friction measurements is a challenging task, because of friction sensitivity to several uncontrollable factors. These factors include: pavement surface conditions, such as the type and thickness of contaminants and fluids on the surface and their interaction with friction forces; and the device operating conditions, such as sliding speed, material properties and geometry of the rubber slider used, and operating temperature. Despite the efforts to describe and quantify the impact of varying conditions on pavement friction, which ultimately will allow for a better harmonization of friction measurements, there is a need to better understand the link between the surface texture and physical friction measurements. In this paper, Persson’s friction model is used to analyze and understand the impact of surface texture on frictional behavior of dry pavement surfaces. The model was used to analyze 18 test locations, which were compared with the dry kinetic coefficients of friction (COF) estimated using a British pendulum tester (BPT). The results show that Persson’s friction model could predict the COF estimated from the BPT results with relatively high accuracy. In addition, the model could provide a profound explanation of the frictional forces mechanism. Finally, it was found that the mean profile depth (MPD) cannot provide a full picture of the frictional behavior. However, combining MPD with the Hurst exponent, texture measurements can potentially provide a full physical explanation of the frictional behavior for road surfaces.

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“…However, there is a slight difference between the intended relation and the true measurements. A more precise relation between the BPN and COF is described in Equation 1 ( 33 ).…”

Section: Methodsmentioning

confidence: 99%

Pavement Friction Modeling using Texture Measurements and Pendulum Skid Tester

Alhasan

Smadi

Bou-Saab

et al. 2018

Transportation Research Record

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“…The chart in Figure 4 was first shown in [11] and shows typical ground reaction forces for one foot walking on a level surface for one stride. The four sections of the stance phase are shown as: A = heel impact; B = foot flat; C = propulsion; D = toe off [12].…”

Section: Literature Reviewmentioning

confidence: 99%

Development of a new shoe/floor slip resistance test rig

Lewis¹,

Hallas

Keen³

et al. 2020

Tribology International

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A critical appraisal of Shoe Slip Tester by The University of Sheffield in collaboration with Health and Safety Laboratories UK is shown in this paper. The Shoe Slip Tester has been designed as a portable and more practical alternative to the Ramp tester which is currently considered the Gold Standard in Shoe/Floor slip resistance testing. Test on identical safety shoe samples were carried out using the Shoe Slip Tester and RAMP in parallel and the data yielded compared between the two test devices. Raw data showed that the Shoe Slip Tester yielded higher coefficients of friction compared to the ramp. However, controlling the data for force applied at shoe impact between the two rigs showed good correlation between the two test devices. A series of recommendations have been made to the design of the Shoe Slip Tester based on tests reported in this paper. These recommendations will improve the correlation between the two test devices. The Shoe Slip Tester can therefore be said to be a suitable alternative to the RAMP tester.

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