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The low-cycle fatigue life assessment method for online monitoring of steam turbine rotors

机译：在线监测汽轮机转子的低周疲劳寿命评估方法

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摘要

The paper presents a simple method for the low-cycle fatigue life monitoring of steam turbine rotors. The method makes use of the equivalent strain energy density rule of notch stress-strain analysis proposed by Molski and Glinka. The method is applied to low-cycle fatigue analyses of steam turbine rotors operating at non-isothermal conditions. A strain energy correction factor is introduced to include the distortion strain energy density. Assessment of the proposed method was done by comparing their estimations with the strain amplitudes obtained from the finite element analysis employing elasitc-plastic material model. The inclusion of energy correction factor obtained from the elastic-plastic finite element analysis significantly improves the accuracy of strain amplitudes and fatigue life estimations. The strain calculation algorithm is based on an analytical solution of the equivalent strain energy equation what makes it very useful for real time fatigue calculations.
机译：本文提出了一种简单的方法来监测汽轮机转子的低周疲劳寿命。该方法利用了Molski和Glinka提出的缺口应力-应变分析的等效应变能密度规则。该方法适用于在非等温条件下运行的汽轮机转子的低周疲劳分析。引入应变能校正因子以包括变形应变能密度。通过将它们的估计值与使用弹塑性材料模型的有限元分析获得的应变幅度进行比较，从而对所提出的方法进行了评估。包含通过弹塑性有限元分析获得的能量校正因子，可以显着提高应变幅度和疲劳寿命估计的准确性。应变计算算法基于等效应变能方程的解析解，这使其对于实时疲劳计算非常有用。

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