Damage-based low cycle fatigue lifetime prediction of nickel-based
single crystal superalloy considering anisotropy and dwell types
Abstract
Based on the physical phenomenon that the fatigue cracks initiate along
specific slip plane, a slip plane damage based low cycle fatigue (LCF)
lifetime model for the nickel- based single crystal superalloy is
established. The predicted results indicate that the lifetime model can
reflect the orientation effect. In addition, in order to characterize
the dwell time dependence of the LCF lifetime, creep damage and
compression-creep damage are introduced to the lifetime model. Finally,
the lifetime predictions under LCF loading with tensile dwell time,
compressive dwell time and LCF with tensile-compressive dwell time are
conducted by employing the lifetime mode, respectively. The predicted
lifetimes show a good agreement with the experimental data, which
verifies the accuracy of the developed lifetime model in this paper.