As torsion bar returns into its original positions after a twist, which method can be used for twist angle measurement.
If displacements are not very high it is possible to use noncontact optical methods for displacement measurements (electron speckle-interferometry, speckle correlation methods ) and to calculate the angle. Also it is possible to use shearography for registration of dw/dx component which in some situation is proportional to the twist angle.
There are many methods for measuring that twist angle , each one depends on the accuracy of your needed results,
but the easier one is by using a simple pointer mounted on the twisted shaft and locating a graph paper behinf the pointer to show you the twist angle
As torsional loading, rosette strain gages can be apply at 45 degree to neutral axis.
In my opinion & to my under standing dr. Emad hussein's saying is more appopriate, because with out our need of accuracy method can be decided.
K C Gupta
Thank you dear Gupta for your reply, please keep in touch with me.
Yours
Emad
Thank you Dr. I will try to contact you. My e-mail Id is [email protected]
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