Fig. 10 Present prediction results of two-step loading tests having
low-to-high, closed symbols, and high-to-low, open symbols, sequences
with the two stress amplitudes of 390 MPa and 432.5 MPa and stress ratio
= -1 compared with available published experimental data3; The squared and circular symbols represent data of
two specimens having different surface configurations.
Figure 11 plots the prediction of the present simulation against the
corresponding experimental fatigue lifetime 4 for the
repeated two-step loading block tests with the parameters listed in
Table 1(b). Each test was carried out seven times with different
specimen configurations. The present prediction lies generally within
the scatter band acceptable amongst the fatigue community.