Crack Growth Life Assessment on Turbine Component under Combined Fatigue Loading

摘要

This paper focuses on a crack growth life assessment method for a turbine component under high-low combined cycle fatigue (HLCCF) loading through experimental and numerical methods. Crack growth tests under HLCCF loading on five full scale turbine components, attached to actual turbine discs, were conducted at elevated temperature by using a Ferris wheel combined fatigue system to simulate the stress under HLCCF loading and temperature distributions. Then, the fracture mechanics (FM) analysis was utilized to simulate crack growth of the turbine component to implement crack growth. The experimental life data agrees well with the crack growth life prediction for the turbine component. In summary, this paper provides a new way to estimate the crack growth lifetime criterion of the turbine components under HLCCF loading through experimental and numerical investigations.