Metals and Materials International

, Volume 7, Issue 3, pp 233–240 | Cite as

Unified viscoplastic models for low cycle fatique behavior of Waspaloy

  • Jong-Taek Yeom
  • S. J. Williams
  • In-Soo Kim
  • Nho-Kwang Park


The deformation behavior of Waspaloy during strain-controlled fatigue tests and creep tests is investigated based on the Chaboche viscoplastic model. Material parameters were determined using the least square fit to uniaxial strain-controlled low-cycle fatique and creep test results. A standard viscoplastic model using nonlinear kinematic and isotropic hardening rules gave a good description for the cyclic hardening or softening observed in symmetric low-cycle fatigue tests, but the application of the deformation model to asymmetric strain conditions resulted in a large overestimation of the mean-stress relaxation. Two modified models are presented as solutions for the overestimation of stress relaxation. A combined nonlinear and linear kinematic hardening rule (NLK+LK model) and a nonlinear kinematic hardening rule with a threshold (2-NLK-TH model) are proposed and their applications are discussed.


unified viscoplastic model low-cycle fatigue NLK+LK model 2-NLK-TH model 


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Copyright information

© Springer 2001

Authors and Affiliations

  • Jong-Taek Yeom
    • 1
  • S. J. Williams
    • 2
  • In-Soo Kim
    • 1
  • Nho-Kwang Park
    • 1
  1. 1.Materials Processing DepartmentKorea Institute of Machinery and MaterialsChangwonKorea
  2. 2.Rolls-Royce PLCDerbyUK

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