Q. If the section shown in the figure turns from fully-elastic to fully-plastic, the depth of neutral axis (N.A.), y , decreases by
(A) 10.75 mm
(B) 12.25 mm
(C) 13.75 mm
(D) 15.25 mm
Ans: 13.75 mm
Solution:
For fully elastic case,
For fully plastic case,
Equal area axis at y = 5 mm
N.A reduces by = 18.75 – 5 = 13.75 mm
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