1 Modeling Fatigue Life of Structural Alloys Under Block Asymmetric Loading
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Fig. 1.7 Computed and experimental deformation trajectories in the second loading block
Figure 1.8 shows the history of average stress in the cycle σ
(m)
11 in the process of
cyclic loading in the second block.
It can be seen that the used thermoplasticity model qualitatively and quantitatively
describes the process after setting.
Figure 1.9 presents fatigue curve of stainless 12X18H9 steel under hard asymmetric cyclic loading. Here the solid curve corresponds to the experimental curve,
while markers show the computational results using the constitutive equations of
MDM (Volkov and Korotkikh 2008; Volkov and Igumnov 2017; Volkov et al. 2016;
Korotkikh et al. 2016, 2015).
The comparison of computational and experimental results proves that the developed MDM model describes both qualitatively and, reliably enough for engineering
purposes, quantitatively, the process of fatigue life of polycrystalline structural alloys
under block-type asymmetric low-cycle loading.
Fig. 1.8 History of changes in the average voltage in the second loading block