Probabilistic modeling of uncertainties in fatigue reliability analysis of turbine bladed disks

Niu, Xiaopeng; Wang, Run-Zi; Liao, Ding; Zhu, Shun‐Peng; Zhang, Xiancheng; Keshtegar, Behrooz

doi:10.1016/j.ijfatigue.2020.105912

Cited by 143 publications

(61 citation statements)

References 52 publications

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“…As a result, a lot of fluctuations appear on the fatigue crack growth curve. Some studies had shown that the residual stress in girth weld can accelerate the fatigue crack growth [24][25][26][27]. In addition, if the effect of residual stress is ignored, the fatigue crack growth rate of girth weld will approach to that of base metal.…”

Section: Discussionmentioning

confidence: 99%

Experimental Research on Fatigue Properties of X80 Pipeline Steel for Synthetic Natural Gas Transmission

Feng

Chi

et al. 2021

Mathematical Problems in Engineering

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In recent years, many synthetic natural gas demonstration projects have been put into operation all over the world, and hydrogen is usually contained in synthetic natural gas. X80 is the most commonly used high-grade pipeline steel in the construction of natural gas pipelines. The compatibility between high-grade pipeline steel and hydrogen directly affects safety and reliability of long-distance pipelines. Therefore, in order to study the effect of hydrogen content on fatigue properties of high-grade pipeline steel, fatigue specimens were taken from base metal, spiral welds, and girth weld of submerged arc spiral welded pipes, respectively. Specifically, the total pressure was 12 MPa and hydrogen content was from 0 to 5vol%. Experimental results indicate that the hydrogen significantly increases the fatigue crack growth rate for both base metal, spiral weld, and heat-affected zone of X80 pipeline steel for about ten times compared with reference environment nitrogen, hydrogen would greatly reduce the fatigue life of the X80 pipeline steel, and the fatigue lifetime would decrease with the increase in hydrogen volume fraction. In order to ensure the safe operation of SNG pipeline, the hydrogen content should be controlled as low as possible.

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Section: Discussionmentioning

confidence: 99%

Experimental Research on Fatigue Properties of X80 Pipeline Steel for Synthetic Natural Gas Transmission

Feng

Chi

et al. 2021

Mathematical Problems in Engineering

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“…Due to the complex structures and loading conditions of hydraulic support, it is difficult to carry out the strength check by material mechanics method. The FE method with the ideas of numerical approximation and discretization has high precision and can deal with large structures with complex shapes, [11][12][13][14][15][16][17] such as turbine bladed disks, 12 gear pairs 14,15 and gas formed structures. 16 The FE method has been adopted for calculating the strength of hydraulic support in many researches.…”

Section: Introductionmentioning

confidence: 99%

Effects of boundary conditions on stress distribution of hydraulic support: A simulation and experimental study

Lin

Yang

et al. 2021

Advances in Mechanical Engineering

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This paper analyzed the effects of boundary conditions on the stress distribution of hydraulic support with the static finite element (FE) model. Five loading conditions are considered in this study, including: 1) canopy torsional loading, 2) canopy eccentric loading, 3) base torsional loading, 4) base diagonal loading, and 5) base symmetrical loading. In order to verify the simulation results obtained from the FE model, the corresponding experiments have also been performed. Based on the comparison between simulation and experimental results, the effects of pin-joint simplified methods and boundary conditions are evaluated in terms of accuracy and efficiency. Moreover, the new elastic-support boundary is also proposed to improve the simulation accuracy under conditions 2, 3, 4, and 5. The results show that bonded contact between the pin and shaft hole has high efficiency and accuracy compared with the frictional contact. The frictional contact boundary is reasonable under condition 1. However, the elastic-support boundary is suggested to be adopted to improve calculation accuracy for the stress distribution of the constraint components (canopy or base) under conditions 2, 3, 4, and 5.

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“…e method of fatigue life prediction based on probability and statistics randomizes the relevant parameters in the models, including load, material parameters [4,5], and structural size [6], and describes the objective uncertainty as a variable that obeys a random distribution. ere are two ways to deal with this kind of methods.…”

Section: Introductionmentioning

confidence: 99%

A Novel Probabilistic Fatigue Life Prediction Method for Welded Structures Based on gPC

Gao

Zhang

Yang

et al. 2021

Mathematical Problems in Engineering

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The traditional fatigue life prediction methods based on the S-N curve all believe that the parameters in the model are deterministic constants and can be categorized to the deterministic life prediction. However, in practice, it is difficult to carry out a large number of experiments due to the limitation of time or the possible shortage of funds. In addition, the specimens used in the experiments are not exactly the same, and the test operations and data reading depend on the accuracy of the test equipment as well as the subjective judgment of the testers, which result to the uncertainty of the S-N curve. Therefore, the uncertainty should be considered in order to improve the accuracy of the fatigue life prediction. In this paper, the uncertain factors affecting the fatigue life of welded joints are summarized, and the generalized polynomial chaos (gPC) is introduced into fatigue life prediction. A novel probabilistic fatigue life prediction method combined with the nonlinear cumulative damage model considering the uncertainty of the S-N curve is constructed. An illustrative example is presented to demonstrate the advantages of the proposed approach.

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Probabilistic modeling of uncertainties in fatigue reliability analysis of turbine bladed disks

Cited by 143 publications

References 52 publications

Experimental Research on Fatigue Properties of X80 Pipeline Steel for Synthetic Natural Gas Transmission

Experimental Research on Fatigue Properties of X80 Pipeline Steel for Synthetic Natural Gas Transmission

Effects of boundary conditions on stress distribution of hydraulic support: A simulation and experimental study

A Novel Probabilistic Fatigue Life Prediction Method for Welded Structures Based on gPC

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