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.