期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 140, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105837
关键词
Hybrid stress- and strain-controlled creep-fatigue interaction loading; Cyclic responses; Life prediction
资金
- National Natural Science Foundation of China [51905261]
- Natural Science Foundation of Jiangsu Province [BK20190678]
- National Key R&D Program of China [2018YFC0808800]
- Graduate Research and Innovation Projects of Jiangsu Province [KYCX20_1001]
In contrast to conventional strain-controlled creep-fatigue interaction (CCFI) loadings, a novel hybrid stress-and strain-controlled creep-fatigue interaction (HCFI) loadings were developed on P92 steel. Dwell stresses ranging from 140 MPa to 170 MPa, and dwell periods of 300 s, 600 s and 1800 s were employed at 625 degrees C. The test responses demonstrate that cyclic softening and hardening effects lead to complicated cyclic responses. In addition, the failure life under HCFI loading is observed to be reduced with the dwell stress and dwell period. Finally, a viscosity-based model is proposed to predict the lifetime of both HCFI and CCFI tests.
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