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| − | Entry by [[Emily Redston]], AP 225, Fall 2011 | + | Entry needed: |
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| − | The classic definition of strain is
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| − | <center><math>\epsilon = {{l_i - l_0} \over l_0} = {\Delta l \over l_0}</math></center>
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| − | 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.
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Revision as of 04:46, 10 December 2011
Entry needed:
Keyword in references:
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