(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.