deformation and flow
Alteration in size or shape of a body under the influence of mechanical forces. Flow is a change in deformation that continues as long as the force is applied. Gases and liquids normally flow relatively freely, while solids deform when subjected to forces. Most solids initially deform elastically (see elasticity), though rigid material such as metals, concrete, or rocks can sustain large forces while undergoing little deformation. If enough force is applied, even these materials will reach their elastic limit, at which point brittle substances fracture while ductile materials (see ductility) rearrange their internal structure, the result being plastic deformation (see plasticity).
This entry comes from Encyclopædia Britannica Concise.
For the full entry on deformation and flow, visit Britannica.com.
Seen & Heard
What made you look up deformation and flow? Please tell us what you were reading, watching or discussing that led you here.