The approach is similar to that described for relaxation measurements (Section 3). Comparisons were made between creep
results gained by using a unique specimen on each stress level
and the results gained by using the same specimen on multiple
stress levels, where increasing levels of stress were applied (Fig.
5). For the measurements of creep at multiple stress levels two different measuring programs, shown in Fig. 5A, were applied. The
first did not include unloading after the creep measurement was
made, whereas the second did.