By MJ Neale and M Gee (Auth.)
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Extra resources for A Guide to Wear Problems and Testing for Industry
2 The configuration of various test rigs for abrasive wear from contact with granular material Wear Tests to Simulate Practical Conditions 45 Also, in practical applications involving more rounded grits, the grit will fracture into sharper particles if the load is above a critical value. This again requires a continuous feed of fresh grit and the careful selection of the test load. Tests which use a continuous feed of new, granular abrasive therefore have a wider range of application. The arrangement shown in Fig.
This does, however, represent the actual configuration for a practical journal beating, so it is not an irrelevant test. The constant contact geometry arrangement represented by the arrangement shown in Fig. 4(d), however, does enable the basic material wear factors to be evaluated more directly. In the journal bearing test it will be important to have a shaft and housing arrangement of a similar thermal dissipation capacity to that in a typical application. This will become more critical if the operating conditions are made more severe to the point where surface melting of the bearing material may begin to become a factor.
Fretting problems also occur in wire ropes as used in lifts and cranes. This arises because the individual steel wires in the ropes rub against each other due to the relative deflections which occur when the tension load on the rope changes, or when it bends to enter or leave a pulley or drum. The problem can often be detected by reddish brown oxide powder emerging from the rope (commonly called 'rougeing'). The fretting damage in this case leads to fatigue fracture of individual wires in critical internal positions, and is the determining factor in limiting the life of a rope.