# Difference between revisions of "Strain"

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− | Entry | + | Entry by [[Emily Redston]], AP 225, Fall 2011 |

+ | The classic definition of strain is | ||

+ | <center><math>\epsilon = {{l_i - l_0} \over l_0} = {\Delta l \over l_0}</math></center> | ||

+ | |||

+ | where <math>l_0</math> is the original length before any load is applied, and <math>l_i</math> is the instantaneous length. <math>\Delta l</math> is the deformation elongation, or change in length at some instant, as referenced to the original length. This strain is typically referred to as "engineering" strain, and it a unitless quantity. Oftentimes strain is expressed as a percentage, so the strain value is simply multiplied by 100. | ||

## Revision as of 04:44, 10 December 2011

Entry by Emily Redston, AP 225, Fall 2011

The classic definition of strain is

where <math>l_0</math> is the original length before any load is applied, and <math>l_i</math> is the instantaneous length. <math>\Delta l</math> is the deformation elongation, or change in length at some instant, as referenced to the original length. This strain is typically referred to as "engineering" strain, and it a unitless quantity. Oftentimes strain is expressed as a percentage, so the strain value is simply multiplied by 100.

## Keyword in references:

An active biopolymer network controlled by molecular motors

A simple model for the dynamics of adhesive failure

Homogeneous flow of metallic glasses: A free volume perspective