A composite bar have four sections each of length 100mm, 150mm, 200mm, 250mm. When force is applied, all the sections causes an elongation of 0.1mm. What will the resultant strain in the bar?

A composite bar have four sections each of length 100mm, 150mm, 200mm, 250mm. When force is applied, all the sections causes an elongation of 0.1mm. What will the resultant strain in the bar? Correct Answer 0.00256

Strain in section 1 = 0.1/100 Strain in section 2 = 0.1/150 Strain In section 3 = 0.1/200 Strain in section 4 = 0.1/250 Resultant strain = 0.001+0.0006+0.0005+0.0004 = 0.00256.
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