Unconsolidated, granular materials such as gravel and sand will support maximum slope angles of about 33 to 35 degrees hence, angle of repose is the name for this maximum slope angle
The angle of repose is the angle formed by the plane of contact between two bodies when the upper body is just on the verge of sliding: the angle whose tangent is the coefficient of friction between the two bodies.
tan-1(2h/d) - where h is the height of the powder pile and d is its diameter Multiply the height by 2 and divide the result by the diameter using a scientific calculator. Then, press the inverse tan key, or tan-1, to get the result you just calculated. This will provide you with the angle of repose. The angle of repose is critical in the design of particulate material processing, storage, and conveying systems. The angle of repose is low when the grains are smooth and spherical.
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