How far can a round bar be rotated before deformation - formula
I have been trying to find a formula to work out how far can a round bar be twisted before being deformed.
I have tried a few from various sources, with great varying results.
Basically, I trying to find how far I can rotate one end of a round bar in DEGREES before it goes beyond its limits staying deformed.
The round bar would be 330mm in length, but the diameters of the bars vary from ie: 15mm to 25mm.
All the bars will be EN24T (4340/817M40).
Once I know how far a bar can be twisted in DEGREES at one end, I can then design levers to ensure the bar is not overstressed using CAD.
Can anyone help with a formula as the Torsion value applied at one end of the bar will be unknown.
thanks