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btrueblood - There is a section of the pipe that has been machined down for attaching the gages. I did not show this on my sketch for clarity. I will give FEA a try as the length of the pipe as compared to the diameter is about 3:1. desertfox - My gauges are positioned just like in figure F in...

The idea is that shear caused by bending is equal for both gages, and gets cancelled out in the wheatstone bridge. Practically speaking, something is causing this not to happen.

I believe that one arm of each gage would be measuring poisson stress in the +45 direction (-45 if torsion is applied in reverse).

Engdoitbetter - I placed the gages 180 degrees apart on what I suspect is the neutral axis. I cannot see the inside of the tube to ensure it is concentric to the outside, but I suspect I have them placed on the neutral axis by virtue of geometry. The error I am seeing is quite high, and the...

Surface roughness is usually measured in micrometers or microinches. Wikipedia has a good description of it with a chart. You can find similar descriptions in the machinery's handbook. Different machining processes can produce varying surface finishes with different roughnesses. There is no...

Hi Everyone, I am trying to measure torsion in a thin walled tube (6.750" OD, 6.500" ID). The tube is also subjected to bending and compression. I purchased some shear strain gauges and have nothing but nice things to say about the gages themselves. I mounted them 180 degrees apart on the...

Thanks Dik! I always feel better getting a second opinion! Regards, Jordan

Hi Everyone! This is my first post, so if it is in the wrong place, or violates any rules, please just send me in the right direction. :) I work for a forensic engineering firm, and am reviewing a practicing engineer's remediation work. In their work they reference (I quote)"CSA Standards...