Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 70, Issue -, Pages 114-122Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2014.08.006
Keywords
Low cycle fatigue; Control mode; Tension-compression asymmetry; Cyclic softening; Fatigue life
Funding
- Natural Science Foundation of China [51325504]
- National High Technology Research and Development Program of China [2012AA040106]
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Cyclic behavior of 9-12% Cr steel under both stress and strain control modes was investigated at 873 K. Significant asymmetric deformation and cyclic softening were observed for both modes. Under the straincontrolled fatigue, a strain level-independent softening factor (SF) was observed. The SF was dependent on applied stress under the stress-controlled fatigue. For the strain-controlled fatigue, the magnitude of cyclic asymmetry decreases with the increase of strain amplitude, while under the stress-controlled fatigue, the asymmetry increases with the increase of stress amplitude. The anomalous ratcheting strain resulted from the asymmetry under the stress-controlled mode has a detrimental effect on fatigue life. (C) 2014 Elsevier Ltd. All rights reserved.
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