Reliability analysis of corrosion affected underground steel pipes considering multiple failure modes and their stochastic correlations

2019 ◽  
Vol 87 ◽  
pp. 56-63 ◽  
Author(s):  
Guoyang Fu ◽  
Wei Yang ◽  
Chun-Qing Li ◽  
Wenhai Shi
Keyword(s):  
Reliability Analysis ◽  
Failure Modes ◽  
Multiple Failure Modes ◽  
Steel Pipes

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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