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Fatigue Assessment of a Turbine Blower

Using two different approaches to evaluate the number of cycles to failure of the welds of a turbine blower

16 August 2020

All • Energy • Industrial Equipment

In this project, a section of a large turbine blower has been studied. The client wanted to focus on the fatigue calculation of the welds. The International Institute of Welding proposed two methods to address this problem: Nominal Stress Approach and Hot-Spot Approach. The latest is expected to be the most suitable for treating welded joints, in which weld toe cracking is the likely mode of failure.

Hot-Spot stress approach

Using the simulation, the client has been able to:

  • Identify high stress areas
  • Calculate the number of cycles to failure of the welds
  • Following a modal analysis, address basic vibration problem related to natural modes of the structure

Detailed of the mesh, including the welds

Von Mises stress on a section of the turbine (cyclic boundary conditions are used)

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