Development of an objective determination of a slip with a portable inclineable articulated strut slip tester (PIAST) |
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Authors: | Wen-Ruey Chang Christopher Brunette Chien-Chi Chang |
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Institution: | aLiberty Mutual Research Institute for Safety, 71 Frankland Road, Hopkinton, MA 01748, USA |
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Abstract: | A portable inclineable articulated strut slip tester (PIAST) is a slipmeter that is widely used in the USA to measure coefficient of friction (COF) at the shoe sole and floor interface. A determination of a slip at the measurement interface, which is currently judged subjectively by operators, plays a crucial role in deciding the outcomes of a PIAST measurement. The goal of this study was to develop an objective determination of a slip based on the movement of the weight used by the slipmeter. The displacement of the weight and the time duration of consecutive strikes in a measurement were used to derive the objective slip criterion. Various footwear materials, floor materials and surface conditions were used to cover a wide range of COF values. The results of the regression analysis indicated that the objective COF predicted by the method developed in the current study was significant (R2 = 0.997, β = 0.991, p < 0.001) in predicting the subjective COF determined by the operator. |
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Keywords: | Objective slip criterion Friction prediction Objective friction coefficient |
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