The code of practice includes a method for measuring bending caused by misalignment of loading in uniaxial fatigue testing. The specific conditions are as consistent as practically possible with those encountered in the fatigue test.
The method explores the effect of both plastic and elastic deformation on bending.
This is NPL Good Practice Guide 1 (GPG1)
Code of practice for the measurement of bending in uniaxial low cycle fatigue testing
09 Aug 2018