Strain Gauge Circuit - Torque measurement (shear straing) in the presence of axial load

[Slagathor]

I am hoping someone with expertise in strain gauge configurations can offer some guidance. My company has need to doing some torque testing on a rotating shaft. We are looking at a number of wireless strain gauge set ups that can handle the task. The question I have is not really related to wireless / rotating measurement though. That is just for background.

The shaft that we need to measure torque on is also subject to significant axial tension. When you install/bond a suitable strain gauge (such as this...

http://www.vishaypg.com/docs/11334/250us.pdf)

will the presence of axial load impact the accurate measurement of torque (shear strain)? If so, is there some sort of compensating circuit that can be created? Is it possible to establish how axial load impacts the strain measurement, and compensate for it during data analysis?

The application is for power measurement between an electric motor, and pumps, compressors, etc, mainly during steady state conditions. This is for acceptance testing, so the closer to zero error we can get, the better.

Thanks for your input.

 

[hydtools]

Try this guide.

Ted

 

[rb1957]

use rosette gauges so you can measure the total stress state.

another day in paradise, or is paradise one day closer ?

 

[neksim22]

You need to take proper strain gauge rosettes for this type of application. In the strain gauge theory there are all rosettes that you need to know.

 

[Slagathor]

Thanks for the link...