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torsion, torqueability Question
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Posted by: imoo

04/27/2006, 07:15:59

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Is there an equation I can use to measure the torqueability or shear modulus of a tube. If I can twist the tube, and measure the degree of twist and force at this point, and I know the overall length, is there an equation I can plug these values into to give me a useful measurement of rigidity/ stiffness etc. Strugg-a-ling







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Re: torsion, torqueability
Re: torsion, torqueability -- imoo Post Reply Top of thread Forum
Posted by: zekeman

04/27/2006, 07:56:37

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theta=TL/JG
theta twist angle,radians
T torque
L length shaft
J moment of inertia of tube cross-section
G shear modulus







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Re: Re: torsion, torqueability
Re: Re: torsion, torqueability -- zekeman Post Reply Top of thread Forum
Posted by: imoo

04/27/2006, 12:34:06

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Cheers. And finally if I was to perform a 3 point bend test on the same hollow cylinder, what would be the equation to calculate the flexural modulus, given I know the support distance, the o.d., i.d., and the force at a given deflection. Thanks in advance.







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Re: Re: torsion, torqueability
Re: Re: torsion, torqueability -- zekeman Post Reply Top of thread Forum
Posted by: swearingen

04/27/2006, 08:46:53

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J is known as the polar moment of inertia and differs from what is commonly called the moment of inertia (first moment of area).







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