This study aims to develop a high temperature LCF test method using a
non-standard miniature thin-plate (MTP) specimen in order to
characterize cyclic visco-plasticity behavior of component materials.
For demonstration, fully reversed strain-range controlled LCF and
creep-fatigue (CF) tests at 600 °C have been performed for a martensitic
steel using both standard-sized full-scale (SSFS) and MTP specimens. A
scaling factor is determined using cyclic visco-plastic finite element
(FE) for geometry constraint evaluation and data conversion based on the
reference strain approach. The equivalent energy principal is proposed
to assess the geometry constraint effect that non-standard MTP specimen
has. The high temperature LCF results from the MTP specimen based on the
proposed testing methodology have shown a good agreement with SSFS
specimen data under equivalent conditions. The methodology can therefore
be used to conduct accurate transferability to achieve equivalent LCF
behavior between the conventional standard specimen and the MTP
specimen.
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