Not sure if you have found a way to get K for a chamfered joint, but in general if you are working with strain gages in general, StrainMatics is a cheap working software that do most of the calibrations. Google it, you should be able to find it. I usually use it in conjunction with...
I recently started working on strain gage measurements on engine components such as exhaust manifolds, strain gage shafts, rocker levers etc. One of my dilemma is the shunt calibration for different bridge configuration such as torsional bridge configuration to self temperature configuration...
