Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 145, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.106092
Keywords
Low-cycle fatigue; Fatigue-creep; Thermo-mechanical fatigue; Life prediction; Phase angle
Funding
- Center of Advanced Aerospace Technology, Faculty of Mechanical Engineering, Czech Technical University in Prague [CZ.02.1.01/0.0/0.0/16_019/0000826]
- Czech Science Foundation (CSF) [GA19-03282S]
- ESIF, EU Operational Programme Research, Development and Education
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The phase angle in TMF tests has a significant influence on the dominant damage mechanism and observed lifetime. A modified damage model has been proposed to account for the effect of the phase angle.
Strain-controlled Low-Cycle Fatigue tests (LCF) and Thermo-Mechanical Fatigue tests (TMF) were performed on a low-alloy martensitic steel in the temperature range between 300 degrees C and 600 degrees C, with and without a strain dwell. TMF tests were performed for three different phase angles between thermal strain and mechanical strain: as in-phase, as out-of-phase and as counter clockwise-diamond. The results show that the phase angle that is employed has a significant influence on the dominant damage mechanism and on the observed lifetime. Finally, a modified damage model is proposed in order to take into account the effect of the phase angle.
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