For a helical torsion sprig, the stress concentration factor at inner fibre is? Give spring index=5.

For a helical torsion sprig, the stress concentration factor at inner

1.	For a helical torsion sprig, the stress concentration factor at inner fibre is? Give spring index=5.
A.	1.005
B.	1.175
C.	1.223
D.	1.545
Answer» C. 1.223