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Define stress and strain....

Define stress and strain.

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The force per unit are is called as stress.
Stress ` , sigma = ( " force")/( " Area") = F/A `
The fractional change in the size of the object, when a force is applied, strain measures the degree of deformation .
Strain , e = ` ( " Change in size")/( " orginal size") = ( Delta l)/( l)`
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