Question

What is the stress concentration factor of a shaft in torsion, where D=1.25 in. and d=1 in. and the fillet radius is, r=0.2 in.a. K=1.4b. K=1.5c. K=1.2d. K=1.3

Answer 1

Concentration factor will be 1.2

So option (C) will be correct answer

Step-by-step explanation:

We have given outer diameter D = 1.25 in

And inner diameter d = 1 in and fillet ratio r = 0.2 in

So
`(r)/(d)` ratio will be
`=(0.2)/(1)=0.2`

And
`(D)/(d)` ratio will be
`=(1.25)/(1)=1.25`

Now from the graph in shaft vs torsion the value of concentration factor will be 1.2

So concentration factor will be 1.2

So option (C) will be correct answer.