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Question: a softwood hollow square bar coupon is tested in torsion...

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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.Theory Question based on the Torsion Lab A softwood hollow square bar coupon is tested in torsion to failure. Pictures of bef

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