Fatigue Analysis of the Piston Rod in a Kaplan Turbine Based on Crack Propagation under Unsteady Hydraulic Loads

Liu, Xin; Luo, Yongyao; Wang, Z W

doi:10.1088/1755-1315/22/1/012017

Cited by 11 publications

(8 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is assumed that initially a small crack or flaw exists in the material. In the previous study, local strain and local stress methods were also discussed, showing that they were not able to realistically predict the number of cycles. Therefore, in the present paper, the crack growth method is explained and developed.…”

Section: Numerical Modelmentioning

confidence: 99%

“…Different operating conditions of the unit have been analyzed in the previous related studies . For the present study, 2 different well‐differentiated operating conditions are selected.…”

Section: Analyzed Casementioning

confidence: 99%

“…According to the operating data of the unit, given by the operator plant, and previous analysis, these 2 conditions approximately represent the operation of the machine for a wide part of its operating time. It is important to notice that the developed procedure in this paper could be used for an accurate future prediction by using a more detailed planned operating service or DRM including more operating conditions.…”

Section: Analyzed Casementioning

confidence: 99%

“…Luo et al improved the mechanical model and transmission of loads to the piston rod. Finally, as a preliminary fatigue research, Liu et al used the local strain approach and a crack growth model to estimate the fatigue life of the piston rod. That study, which serves as a base for the present paper, shows the numerical model and performs a calculation of the fatigue life in a simplified condition without analyzing the sensitivity of the different parameters.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Crack growth analysis and fatigue life estimation in the piston rod of a Kaplan hydro turbine

Liu

Presas

Luo

et al. 2018

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

Linear elastic fracture mechanics (LEFM) approaches are seldom used to analyze fatigue problems in hydraulic turbomachinery, where extremely simplified fatigue models are normally considered. In one of the largest Kaplan hydraulic turbines in the world, the piston rod, which is an important load transfer component, was found broken twice at the same location. This event, which leads to extremely high direct reparation costs and indirect costs, is a very useful case for research of fatigue problems in hydraulic turbines by means of LEFM. For this purpose, the crack growth progress in the piston rod is simulated with numerical LEFM techniques. A probabilistic model for the initial flaw size is considered. A reliability criterion, consisting in the probability of not having a critical crack or a fracture in the piston rod after a specific service time, is defined. Based on this model, the influence of initial crack models and operating services of the machine on the reliability of the unit is discussed. The calculated crack path and predicted number of loading cycles as a function of the initial crack size agree with the actual fracture section and operating time to fracture.

show abstract

Section: Numerical Modelmentioning

confidence: 99%

“…Different operating conditions of the unit have been analyzed in the previous related studies . For the present study, 2 different well‐differentiated operating conditions are selected.…”

Section: Analyzed Casementioning

confidence: 99%

Section: Analyzed Casementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crack growth analysis and fatigue life estimation in the piston rod of a Kaplan hydro turbine

Liu

Presas

Luo

et al. 2018

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Over the time, the real situation has shown that the Kaplan turbines are one of the perfect candidates to fatigue breaks appearance [6,7]. One of the Kaplan turbines structure, most stressed, is the runner blade [8] and its operating mechanism, all its components [9], especially the lever pin.…”

Section: Introductionmentioning

confidence: 99%

Lifetime estimations of the operating mechanism of Kaplan turbine runner blades

2017

Teh. vjesn.

View full text Add to dashboard Cite

Original scientific paper The paper contains a complex analysis regarding the steps that must be followed in order to estimate the lifetime of the operating mechanism of Kaplan turbine runner blades. The work is structured in 3 parts, every one corresponding to a step that is followed: determination of the real load on operating mechanism, results of operating tests made to determine stress amplitude on operating mechanism lever pin and real fatigue cycles, numerical simulation of stresses on lever pin, lifetime estimations. The work reveals: the area where the maximum stress is located, the value of stress amplitude for lever pin, the location of maximum elongation and the importance of knowing the real number of fatigue cycles in lifetime estimations process.

show abstract

Online Method for Assessment and Tracking of Wear in Kaplan Turbine Runner Blades Operating Mechanism

Peyrano

Vaccaro²,

Mayer

et al. 2022

Proceedings of IncoME-VI and TEPEN 2021

View full text Add to dashboard Cite

Fatigue Analysis of the Piston Rod in a Kaplan Turbine Based on Crack Propagation under Unsteady Hydraulic Loads

Cited by 11 publications

References 12 publications

Crack growth analysis and fatigue life estimation in the piston rod of a Kaplan hydro turbine

Crack growth analysis and fatigue life estimation in the piston rod of a Kaplan hydro turbine

Lifetime estimations of the operating mechanism of Kaplan turbine runner blades

Online Method for Assessment and Tracking of Wear in Kaplan Turbine Runner Blades Operating Mechanism

Contact Info

Product

Resources

About