Fracture Failure Mechanism Analysis on LP Blades of a Gas Turbine

Abstract:

The fracture phenomenon, mechanism, characteristic and reason of LP second stage blade of certain type gas turbine are systematically studied. The damaged trace, fracture appearance, material composition, metallographic structure to LP second stage blade of certain type gas turbine are first analyzed; and then the vibration characteristic is analyzed combined with LP second stage blade working state and structure features; and then the vibration characteristic calculation analysis is performed combined with LP second stage blade working state and structure features. The analysis indicates that fracture feature of the LP second stage blade belongs to HCF fracture; there is an original manufacture defect of shallow gully shape in the area of fatigue source, and the fatigue fracture of blade is related to the defect; finally, preventive measures to LP second stage blade are proposed pertinently.

• Periodical: Applied Mechanics and Materials (Volume 574)
• Pages: 8-14
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.574.8
• Online since: July 2014
• Authors: Ben Wu Liu*, Jian Jun Wang
• Keywords: Fracture Analysis, Fracture Failure, High Cycle Fatigue, LP Blade, Metallographic Structure

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