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Define stress and strain....

Define stress and strain.

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Stress: The force per unit area is called as stress.
`"Stress",sigma=("Force")/("Area")=(F)/(A)`
Strain: Strain is defined as the ratio of change in size to the original size of an object. It measures the degree of deformation.
`"Strain",epsilon=("Change in size")/("Original size")=(Deltal)/(l)`
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