Issue 33

Y. Wang et alii, Frattura ed Integrità Strutturale, 33 (2015) 345-356; DOI: 10.3221/IGF-ESIS.33.38 352 V ALIDATION BY EXPERIMENTAL DATA n order to check the accuracy of the proposed approach in estimating fatigue lifetime under VA multiaxial fatigue loading, a number of experimental data were selected from the technical literature [12, 20-22]. The summary of the static and fatigue properties of the considered materials is reported in Tab. 1 and 2. When the torsional material constants listed in the above tables were not directly available in the original sources, they were calculated as follows [23]: 2(1 ) E G    ' ' 3 f f    ' ' 3 f f    0 b b  0 c c  Figure 3 : In-field use of the MMCCM to estimate fatigue lifetime under VA multiaxial fatigue loading. The investigated materials’ non-proportional hardening was taken into account by making the following assumption [23]: I