(c)
Figs.9: The predicted spatial distributions of (a) axial stress, (b) axial strain, and (c) visco-plastic multiplier distributions until the 58th cycle (peak tensile loading point) at the applied strain of 0.7% and strain-rate of 0.01%s-1 for the MTP specimens using the ultimately determined scaling factors (Table 2).
From all mentioned in this section, the cyclic elasto-visco-plastic deformation essence of LCF testing for non-standard MTP specimen is the identification of scaling factor using a reliable mechanics-based technique to achieve equivalent high temperature LCF deformation as SSFS specimen exhibits. These simulations have proved that the geometry constraint effect in the MTP specimen is primarily responsible for the finalized identified scaling factor, as well as the subsequent cyclic deformation, which reveals the underlying mechanism of the MTP specimen design principle from the perspective of mechanics. The numerical findings based on UVP model will be checked through experimental LCF test at 600 °C for FV566 in the following sections in order to further demonstrate the testing methodology developed in this study.