Question: a softwood hollow square bar coupon is tested in torsion...
A softwood hollow square bar coupon is tested in torsion to failure. Pictures of before and after fracture are shown below.
Dimensions include: width and depth b = d = 19.05 mm and hole diameter d= 12.7 mm
Calculate the torsional constant J
And the torsional shear stresses at the outer surface and at the inner hole diameter.
Assume a torque of T is acting on the cross-section.