sand hill analogy

sand hill analogy

[′sand ‚hil ə‚nal·ə·jē]
(mechanics)
A formal identity between the differential equation and boundary conditions for a stress function for torsion of a perfectly plastic prismatic bar, and those for the height of the surface of a granular material, such as dry sand, which has a constant angle of rest. Also known as sand heap analogy.
Mentioned in ?