Reliability analysis of creep–fatigue failure

2000 ◽  
Vol 22 (9) ◽  
pp. 789-797 ◽  
Author(s):  
H Mao
Keyword(s):  
Reliability Analysis ◽  
Fatigue Failure ◽  
Creep Fatigue

Creep-Fatigue Interaction Effects On Pressure-Reducing Valve Under Cyclic Thermo-Mechanical Loadings Using Direct Cyclic Method

2021 ◽  
Author(s):  
Nak-Kyun Cho ◽  
Youngjae Choi ◽  
Haofeng Chen
Keyword(s):  
High Temperature ◽  
Power Plant ◽  
Fatigue Failure ◽  
Material Properties ◽  
Structural Integrity ◽  
Direct Method ◽  
Element Model ◽  
Critical Loading ◽  
Creep Fatigue ◽  
Pressure Reducing Valve

Abstract Supercritical boiler system has been widely used to increase efficiency of electricity generation in power plant industries. However, the supercritical operating condition can seriously affect structural integrity of power plant components due to high temperature that causes degradation of material properties. Pressure reducing valve is an important component being employed within a main steam line of the supercritical boiler, which occasionally thermal-fatigue failure being reported. This research has investigated creep-cyclic plastic behaviour of the pressure reducing valve under combined thermo-mechanical loading using a numerical direct method known as extended Direct Steady Cyclic Analysis of the Linear Matching Method Framework (LMM eDSCA). Finite element model of the pressure-reducing valve is created based on a practical valve dimension and temperature-dependent material properties are applied for the numerical analysis. The simulation results demonstrate a critical loading component that attributes creep-fatigue failure of the valve. Parametric studies confirm the effects of magnitude of the critical loading component on creep deformation and total deformation per loading cycle. With these comprehensive numerical results, this research provides engineer with an insight into the failure mechanism of the pressure-reducing valve at high temperature.

scholarly journals Reliability Analysis of Fatigue Failure of Cast Components for Wind Turbines

Energies ◽  
2015 ◽  
Vol 8 (4) ◽  
pp. 2908-2923 ◽  
Author(s):  
Hesam Rafsanjani ◽  
John Sørensen
Keyword(s):  
Reliability Analysis ◽  
Fatigue Failure ◽  
Wind Turbines

Reliability Analysis on a Turbine Disk Considering the Coupling of Multiple Failure Modes

2018 ◽  
Author(s):  
Dianyin Hu ◽  
Ying Shi ◽  
Xi Liu ◽  
Rongqiao Wang
Keyword(s):  
Reliability Analysis ◽  
Failure Modes ◽  
Low Cycle Fatigue ◽  
Single Mode ◽  
Turbine Disk ◽  
Coupling Scheme ◽  
Multiple Failure Modes ◽  
Creep Fatigue ◽  
Turbine Disks ◽  
Complex Structural

Current probabilistic design methods mainly focus on single mode of failure, under the consideration on random variables including geometry, loading, and material properties. However, due to the complex structural characters and unevenly distributed temperature, turbine disks are always undergoing multiple potential failure modes, which should be effectively evaluated under a coupling scheme in reliability analysis. To this end, a collaborative response surface method involving multiple potential modes was established, aligning individual failure modes that were precisely evaluated via linear heteroscedastic regression analysis. To validate our model, reliability assessment was conducted on a turbine disk in turbo-shaft engine, where the coupling failure including low cycle fatigue and creep-fatigue was considered. This method can be an effective tool in the evaluation of reliability analysis involving multiple failure modes.

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