Deformation

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

Deformation is measured by how much an object is deformed from its origional dimensions.

Deformation formula

\(\large{ \epsilon = \frac{ \delta }{ l_i }  }\)

Where:

\(\large{ \epsilon }\)  (Greek symbol epsilon) = strain

\(\large{ \delta }\)  (Greek symbol delta) = deformation

\(\large{ l_i }\) = initial length

Elastic deformation

Elastic deformation is when strain is applied and disappears immediately when the stress is removed.

Plastic deformation

Plastic deformation is when strain is applied and does not disappear when the strain is removed.  When the load on a material has passed its elastic limits or yield stress the deformation becomes perminent.

Deformation wear

Deformation wear is a result of repeated plastic deformation at the wearing surface, producing a surrounding structure of cracks that grow and combine to form wear particles.

 

Tags: Equations for Strain and Stress