The influence of sample cutting on the residual stresses
obtained by means of a XRD analysis is studied in this part.
A strain gauge is glued in the drilled hole to record strains
during sample cutting and to compare strains before and after
cutting. The strains are measured in three directions 0°, 45°
and 90°. 45° corresponds to circumferential direction
During the cutting process, an increase of the sample
temperature is observed. Although it is not sufficient to relax
residual stresses (delta temperature around 50°C), the sample
is slightly dilated, which implies a perturbation during the
recording. To avoid errors, the recording is performed for a
long time to decrease the sample temperature in ambient
conditions and to make a comparison between strains before
and after cutting at the same temperature.