Fatigue crack propagation heat-resistant alloys under thermomechanical loading conditions. Part I. Method of accounting the effect of thermomechanical loading on crack propagation resistance of material

摘要

We propose a comprehensive method for taking into account the effect of thermomechanical loading components on variation in the fatigue crack propagation rate. This method accounts for the variability of calculated stress intensity factors over the crack front and over the time of a thermal cycle. We describe the experimental results obtained for KhN70VMTYu and KhH73MBTYu alloys. Crack propagation diagrams are plotted for these alloys for two thermal-cycling modes, which cover near-threshold and medium-amplitude portions of these curves.