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A new stress field intensity model and its application in component high cycle fatigue research

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  • SongSong Sun

Abstract

Fatigue limit load is one of the most important and concerned factors in designing and manufacturing critical mechanical parts such as the crankshafts. Usually, this governing parameter is obtained by experiment, which is expensive, time-consuming and only feasible in analyzing the case of simple structure. Still, there's a big obstacle to clear to get the fatigue limit load of a sophisticated structure effectively and efficiently. This paper applied the stress field intensity theory to make quick component fatigue limit load predictions. First, the field diameter of a given crankshaft was determined based on its limit stress state and a stress distribution fitting approach. Then, this parameter was used to predict the high-cycle bending fatigue limit load of a new crankshaft composed of the same material. Finally, a corresponding experimental verification was conducted to evaluate the accuracy of the predictions. The results indicated that the original stress field intensity model may not be suitable due to the errors in the predictions, which can be attributed to the structural features. The new model proposed in this paper can provide higher accuracy in quick fatigue load prediction, making it superior to the traditional model in engineering application.

Suggested Citation

  • SongSong Sun, 2020. "A new stress field intensity model and its application in component high cycle fatigue research," PLOS ONE, Public Library of Science, vol. 15(7), pages 1-20, July.
  • Handle: RePEc:plo:pone00:0235323
    DOI: 10.1371/journal.pone.0235323
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    References listed on IDEAS

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    1. Songsong Sun & Xiaoli Yu & Zhentao Liu & Xiaoping Chen, 2016. "Component HCF Research Based on the Theory of Critical Distance and a Relative Stress Gradient Modification," PLOS ONE, Public Library of Science, vol. 11(12), pages 1-17, December.
    2. Jie Tian & Jun Tong & Shi Luo, 2018. "Differential Steering Control of Four-Wheel Independent-Drive Electric Vehicles," Energies, MDPI, vol. 11(11), pages 1-18, October.
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