What is "dilatancy"

n. 1 The property of dilating or expanding, especially by means of an increase in space between the component parts. 2 (label en physics) The phenomenon of some substances whose viscosity increases with shear rate, or with pressure.

Dilatancy may refer to:

• Dilatancy (granular material): an increase in volume under shear
• Dilatancy (viscous material): the solidification of viscous fluids under pressure

Dilatancy is the volume change observed in granular materials when they are subjected to shear deformations. This effect was first described scientifically by Osborne Reynolds in 1885/1886 and is also known as Reynolds dilatancy.

Unlike most other solid materials, the tendency of a compacted granular material is to dilate (expand in volume) as it is sheared. This occurs because the grains in a compacted state are interlocking and therefore do not have the freedom to move around one another. When stressed, a lever motion occurs between neighboring grains, which produces a bulk expansion of the material. On the other hand, when a granular material starts in a very loose state it may initially compact instead of dilating under shear. A sample of a material is called dilative if its volume increases with increasing shear and contractive if the volume decreases with increasing shear.

Dilatancy is a common feature of the soils and sands. Its effect can be seen when the wet sand around the foot of a person walking on beach appears to dry up. The deformation caused by the foot expands the sand under it and the water in the sand moves to fill the new space between the grains.

Dilatancy is also studied by geotechnical engineers, and is a part of the broader topic of soil mechanics.