Lamboum abrader

Abrasion under limited slip used to be, and to some extent still is, measured either with the standard Akron abrader or the Lamboum abrader. In case of the Akron abrader the sample runs under a slip angle at a constant load against the abrasive surface of an alumina grind stone. Speed and load are fixed the side force is not measured. 

The Lamboume abrader is essentially the Dunlop apparatus which used to be specified in BS 903, and which uses a wheel test piece with the degree of slip being controlled by an eddy current brake. An improved Lamboume machine is now being proposed for standardization in ISO TC 45. This instrument has both the test piece and the abradant in the form of wheels (type (c) of Figure 11.4) but both are driven at different speeds to give slip. 

The temperature during test is often not known. A comprehensive investigation of the temperature for the test wheel in a modified Lamboume abrader has been made by Ramakrishnan et al81 using an infrared camera. The predicted rise for thermoplastics in a pin on disk system has been compared with measurements82 and, presumably, the calculation could be applied to other circumstances. 

Akron and the improved Lamboume are distinctive for the ability to vary slip angle in a simple manner and the Schiefer for giving uniform multidirectional abrasion. Probably the most versatile commonly used apparatus is the Taber because of the very wide range of abradants readily available and its ability to operate with lubricants. The LAT 100 is in a class of its own as regards sophistication and features. 

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See also in sourсe #XX -- [ ]

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