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Stepped‐isothermal fatigue analysis of engine piston
Author(s) -
Zhang Qing,
Zuo Zhengxing,
Liu Jinxiang
Publication year - 2014
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12125
Subject(s) - piston (optics) , reliability (semiconductor) , creep , structural engineering , stress (linguistics) , isothermal process , fatigue testing , vibration fatigue , finite element method , engineering , mechanical engineering , materials science , composite material , power (physics) , linguistics , physics , philosophy , quantum mechanics , wavefront , optics , thermodynamics
Stepped‐isothermal fatigue failure is the main failure mechanism of modern engine pistons under bench reliability test condition. This paper presents a methodology for stepped‐isothermal fatigue analysis of engine pistons, which consists of a fatigue criterion, evaluation of temperature and stress distribution by finite element analysis and the final life prediction. The major character of the methodology is the fatigue definition of engine pistons with respect to engine load change cycle and a damage‐based fatigue criterion accounting for the nonlinear creep–fatigue damage. Taking as an example, the fatigue life of an engine piston was predicted by the proposed analysis procedures. The analysis results showed that the most critical area was located in the throat edge. Moreover, the proposed methodology can give a relatively accurate and reasonable life prediction for an engine piston under the loading condition of bench reliability test, with a benefit of decreasing the needed component's reliability tests and design time.