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Strength of Materials

Simple Stress and Strain-II

A steel bar o...

Question

A steel bar of length 3 m has yield stress 250 MPa and the slope of linear part of stress-strain curve is 190 GPa. The bar is loaded axially until it elongates 6 mm and then the load is removed. What is residual strain in bar?

A

0.002

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B

0.00131

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C

0.00069

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D

None

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Solution

The correct option is C 0.00069

$Total strain = \frac{6}{3000} = 0.002$

$Elastic strain = \frac{250}{190 \times 10^{3}} = 0.00131$

$Residual strain = 0.00069$

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