![If the section shown in the figure turns from fully-elastic to fully-plastic, the depth of neutral axis (N.A.), y , decreases by](https://www.gkseries.com/blog/wp-content/uploads/2023/07/If-the-section-shown-in-the-figure-turns-from-fully-elastic-to-fully-plastic-the-depth-of-neutral-axis-N.A.-y-decreases-by.jpg)
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
![](https://www.gkseries.com/blog/wp-content/uploads/2023/07/image-193.png)
(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,
![](https://www.gkseries.com/blog/wp-content/uploads/2023/07/image-195.png)
For fully plastic case,
Equal area axis at y = 5 mm
N.A reduces by = 18.75 – 5 = 13.75 mm