A Miniaturized Thin-Plate Low Cycle Fatigue Test Method at
Elevated Temperature
M., Li1,2*, S.,
Maskill2, Z.X., Wen1, Z.F.,
Yue1, W., Sun2
1School of
Mechanics, Civil Engineering and Architecture, Northwestern
Polytechnical University, Xi’an,
710072, China
2Faculty of Engineering, University of Nottingham,
Nottingham, NG72RD, UK
Abstract: 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.
Keywords: MTP; SSFS; LCF; Unified Visco-Plasticity Model;
Scaling Factor