What will be the stress at −20oC, if a steel rod with a cross-sectional area of 150mm2 is stretched between two fixed point ? The tensile load at −20oC is 5000N: (Assume α=11.7×10−6/oC and Y=2000×1011N/m2)
A
93.6×106N/m2
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B
9.36×106N/m2
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C
936×106N/m2
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D
0.936×106N/m2
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Solution
The correct option is A936×106N/m2 By stress strain relationship, we know that,