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Failure Analysis of Steam Turbine Blade Fracture

2013-09-22
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Analysis of turbine blade fracture failure: Blades can be divided into two types according to their working properties: moving blades and stationary blades. Moving blades are also called working blades, which mainly play the role of transmitting power; stationary blades are also called guide blades, which mainly play the role of guiding fluid. When the blades are in operation, they are mainly subjected to stresses such as tension, compression, bending, and torsion; in addition, the blades are also subjected to excitation, and their vibration frequency has a great influence on the life of the blades. The failure form of the blades is mainly fatigue failure; but stress corrosion cracking, plastic deformation and other failure forms may also occur. In fatigue failure, especially fatigue failure of moving blades, vibration often plays a big role; it should be pointed out that micro-vibration failure is also one of the important forms of blade failure. According to the location of the blade fracture or damage, the failure type can be divided into three types: (1) blade body fracture failure; (2) blade root fracture failure; (3) blade crown or blade tip failure. This article will introduce an example of blade failure analysis, list the types of fatigue loss and conduct a simple theoretical analysis.

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