A new ductility exhaustion model for high temperature low cycle fatigue life prediction of turbine disk alloys

• Author(s) / Creator(s)

  • Zhu, Shun-Peng
  • Sun, Rui
  • Zuo, Ming J.
  • Li, Haiqing
  • Huang, Hong-Zhong

• Based on ductility exhaustion theory and the generalized energy-based damage parameter, a new viscosity-based life prediction model is introduced to account for the mean strain/stress effects in the low cycle fatigue regime. The loading waveform parameters and cyclic hardening effects are also incorporated within this model. It is assumed that damage accrues by means of viscous flow and ductility consumption is only related to plastic strain and creep strain under high temperature low cycle fatigue conditions. In the developed model, dynamic viscosity is used to describe the flow behavior. This model provides a better prediction of Superalloy GH4133's fatigue behavior when compared to Goswami's ductility model and the generalized damage parameter. Under non-zero mean strain conditions, moreover, the proposed model provides more accurate predictions of Superalloy GH4133's fatigue behavior than that with zero mean strains.

• Date created

  2011

• Subjects / Keywords

  • High Temperature Low Cycle Fatigue
  • Viscosity
  • Ductility
  • Life Prediction
  • Mean Strain

• Type of Item

  Article (Published)

• DOI

  https://doi.org/10.7939/R36M33H4Z

• License

  © 2011 Shun-Peng Zhu et al. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.