Talk:Torsion (mechanics)

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can anybody tell me what "torsional stiffness of 12MNm/rad" really means?

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It means that in order to twist it one radian (angle measurment) you need to apply a torque of 12MNm (millions of newton-meters).

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I consider the wikipedia article useful for its links to related articles despite the article content being brief. Wikionary does not serve this purpose. Rtdrury 02:13, 5 December 2005 (UTC)

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Can someone knowledgeable on the subject confirm that the first formula is correct in using I (moment of inertia) instead of J (polar moment of inertia)? Moment of inertia is dependent of density, and it seems unreasonable that density should enter into this formula (density should not affect stress) --Avl 20:01, 30 July 2006 (UTC)

Also, when I think about it, isn't the sentence "a solid material (e.g. Steel)" highly suspect? Do these formulas not work on Styrofoam? Later in the same text, there seems to be a confusion of object shape and material. "tube" is not a material - a tube can be made of different materials, including steel.--Avl 20:21, 30 July 2006 (UTC)

I fixed it up a bit... though more work probably needs to be done. Nephron  T|C 22:41, 18 August 2006 (UTC)