Discussion on Fatigue Life Analysis Methods for Connecting Bolts of the Top Cover of Water Pump Turbines

Under the joint action of dynamic and static loads, the connecting bolts of the top cover of the pump turbine are prone to cumulative damage in local areas such as threads, resulting in cracks or development, and fatigue fracture may occur in severe cases, which will cause serious safety accidents....

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Bibliographic Details
Published inApplied mechanics and materials Vol. 914; pp. 181 - 190
Main Authors Li, Cheng Jun, Zhang, Xin, Chen, Liu, Hu, Kun, Qiu, Lan, Yin, Miao Miao, Li, Hai Bo, Chen, Shun Yi, Wang, De Lou
Format Journal Article
LanguageEnglish
Published Zurich Trans Tech Publications Ltd 15.05.2023
Subjects
Bolted joints
Cumulative damage
Fatigue cracks
Fatigue failure
Fatigue life
Field strength
Pump turbines
Static loads
Strain analysis
Stress-strain relationships
Water damage
Pump Turbines
Fatigue
Life Estimates
Top Cover Connecting Bolts
Pumped Storage Power Station
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Summary:Under the joint action of dynamic and static loads, the connecting bolts of the top cover of the pump turbine are prone to cumulative damage in local areas such as threads, resulting in cracks or development, and fatigue fracture may occur in severe cases, which will cause serious safety accidents. Therefore, it is necessary to carry out accurate fatigue life estimation analysis for connecting bolts, which has always been a hot spot and difficulty in the industry. This paper introduces several commonly used fatigue life analysis methods of parts, combined with the force characteristics and structural characteristics of the connecting bolts of the top cover, and analyzes and discusses the fatigue life analysis methods suitable for the top cover bolts. Finally, it is believed that the application of stress-strain field strength method can better describe the actual state of the bolt danger area, and the current damage state has an influence on the amount of damage generated by further loading, and the fatigue life analysis of connecting bolts can be combined with the stress-strain field strength method and variable damage linear cumulative damage theory, and the fatigue life and residual fatigue life can be estimated in the design stage or after the phased service of the bolt.
Bibliography:Special topic volume with invited peer-reviewed papers only
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:1660-9336
1662-7482
1662-7482
DOI:10.4028/p-w522am