Abstract
As the friction and wear properties of polymers are very much influenced by the tribological variables, a testing system which permits the use of a wide range of test speeds, loads and environmental conditions is required. This paper describes a simple and accurate computer-aided bench machine developed to measure the dynamic coefficient and wear rate of plastics. Plane on plane contact and sliding reciprocating motion have been chosen. The design concepts are outlined and the specifications and characteristics of the apparatus are presented. Factors determining the precision of the instrument are indicated. It is shown that the microcomputer attachment offers improved versatility in relation to operating conditions. A software flow chart showing the possible ways in which friction testing may be carried out is presented. Typical experimental results obtained with the apparatus are also presented for engineering thermoplastics rubbed against steel in dry conditions. Based on those data, empirical relationships between the coefficient of friction and the operating conditions have been found.
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