Failure Investigation of the Wind Turbine Blade Root Bolt
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The failure analysis of the high-strength bolt at root position of the wind turbine blade was conducted to find the cause of fracture. Detailed investigations using several characterization techniques such as stress calculation, chemical composition test, mechanical property test, metallurgical investigation, and fractography analysis were performed to identify the cause of the bolt failure. Based on the theoretical calculation and failure analysis, it could be concluded that the bolt failed by fatigue accelerated by stress concentration while under low temperature. Practical suggestions were also given to avoid similar failures.
KeywordsFailure analysis High-strength bolt Wind turbine blade Fractography Stress concentration
This study was supported by the Fundamental Research Funds for the Central Universities under Grant No. FRF-BR-10-007A and No. FRF-AS-09-001A.
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