During Phase 3, it can be appreciated from Figure 2 (right side) that the deformation noise is significantly small. Under constant load, the experimental standard deviation of the deformation signal is 20nε,
independently from the sampling frequency.
In Phase 4 instead, one can remark that the measured signal goes back to its unloaded value.
The Young modulus of the specimen is calculated through its strain-force characteristic, displayed in Figure 3. We obtain 69.34GPa against a theoretical value of 69.30GPa, with an accuracy of 0.05%.