Friday 23rd of February 2018

Design and Construct of Coefficient of Friction (COF) Machine utilizing ISO 13287: 2006 And Analyzingto Find Better COF of Shoes Sole Material

Chalermkiet Srisila

The objectives of this research were to design and construct of coefficient of friction (COF) measuring machine according to ISO 13287: 2006 standard and to analyze and increase the values of COF of safety shoe heels that available in the market. The machine designed was utilizing metal weight to generate the vertical force. The heel angle could be set between 3 and 20 degrees. A pneumatic cylinder of 50 mm in diameter was used to move the tested floor with the speed of 30 500 mm /s. Two force transducers were used to detect vertical and horizontal forces. Each one had the capacity of 1,000 N. After assembling, the machine was tested. The results of the tests were comply with the standard. After that, 29 heel materials classified into 4 material groups were measured. According to the tested results, acrylonitrile - butadiene synthetic rubber (NBR) was selected to be further developed to gain better values of COF. Additives phenolic resin (P) and silicon dioxide (E) were added between 7- 15 percents by weight into the original ingredient of NBR. The totals of 99 heels were made to find the best ingredient giving the maximum value of COF among them. The testing results indicated that the P14 ingredient gave the highest value of COF. This ingredient was the original NBR added 14 percents of phenolic resin. To compare the values of COF between the original NBR and the P 14, 4 testing combinations were carried out. One way ANOVA was used to find the difference between the 2 heel materials. The ANOVA results indicated that the differences of COFs from the 2 heels were significant (p

Keywords: Acrylonitrile-butadiene synthetic rubber, Coefficient

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Chalermkiet Srisila
Pibulsongkram Road, Bangsue, Bangkok 10800

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