Testing with vibrated Storage Time:
Many bulk materials gain cohesive strength when vibrated for a period of time, in particular in the presence of inter-particle moisture and clay. In those situations, vibrated storage tests should be carried out to determine the amount of strength gained after vibration to allow design parameters to be calculated for these conditions. This is of importance for belly-dump rail car designs to determine the minimum outlet dimensions to prevent bridging.
Wall Friction Testing:
Frictional measurements between wear liners and the bulk material provide the design basis for transfer chutes and hoppers. From wall friction charts, minimum chute and valley angles may be calculated as a function of the material bed depth. Adhesion and wall friction on large (lump) materials can also be measured in an inverted style wall friction tester. This is useful in selecting wall materials that may exhibit the least amount of hang-up in static conditions such as reclaimer buckets, truck trays or dribble chutes.
