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<p>To investigate the effect of localized friction variation within the contact area, the finite element method and the critical-plane based Smith–Watson–Topper (SWT) model were employed to analyze the low-cycle fatigue (LCF) life of a dovetail joint in a 300 MW F-class heavy-duty gas turbine from two aspects of local friction coefficient and local friction length. The results show that the LCF life of the dovetail root increases with the decrease of the friction coefficient in the upper side of the contact area, while the LCF life of the dovetail groove increases with the decrease of the friction coefficient in the lower side. The closer the friction coefficient is to the edge of contact area, the greater the influence on the LCF life of the dovetail joint. Reducing the friction coefficient in a short friction area near both the upper and lower edges of the contact area simultaneously can notably enhance the LCF life of the dovetail joint. Localized reducing of the friction coefficient can achieve an effect comparable to reducing it across the entire contact area.</p>

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Effect of localized friction variation within the contact area on low-cycle fatigue life of a dovetail joint

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Liang Chen,
  • Xuesong Li

摘要

To investigate the effect of localized friction variation within the contact area, the finite element method and the critical-plane based Smith–Watson–Topper (SWT) model were employed to analyze the low-cycle fatigue (LCF) life of a dovetail joint in a 300 MW F-class heavy-duty gas turbine from two aspects of local friction coefficient and local friction length. The results show that the LCF life of the dovetail root increases with the decrease of the friction coefficient in the upper side of the contact area, while the LCF life of the dovetail groove increases with the decrease of the friction coefficient in the lower side. The closer the friction coefficient is to the edge of contact area, the greater the influence on the LCF life of the dovetail joint. Reducing the friction coefficient in a short friction area near both the upper and lower edges of the contact area simultaneously can notably enhance the LCF life of the dovetail joint. Localized reducing of the friction coefficient can achieve an effect comparable to reducing it across the entire contact area.