The influence of temperature transients on the lifetime of modern high-chromium rotor steel under service-type loading

Isothermal and thermo-mechanical fatigue behavior of the nickel base superalloy Waspaloy™ under uniaxial and biaxial-planar loading

“…8, and the resulting higher damage. This finding are confirmed by the studies of Cui et al [62] and Wang et al [63,64]. Wang et al have done a damage simulation based on a Chaboche model and have proven that the maximum damage is oriented 45°to the loading axes.…”

“…As preferred location for crack initiation the transition area to the edge which was determined by damage simulations [63,64] and metallographic examinations [62]. Because of the different inductor design in our study compared to Cui et al [62] and Wang et al [63,64] the crack initiation was almost located within the gauge area and rarely in the transition radius. One example for the crack initiation within the transition area was the isothermal fatigue test at 923 K with a strain ratio of 0.6%, see Fig.…”

A local extrapolation based calculation reduction method for the application of constitutive material models for creep fatigue assessment

“…It can be observed that higher temperature and longer hold times, see also [12], which mean a superposition of creep damage, lead to higher values of critical damage. Furthermore, the critical damage value is material specific as shown in [13] by creep fatigue life assessment of 1%Cr, 2%Cr, and 10%Cr steels with a phenomenological method. A correlation between the damage value D and the lifetime of components, the determination of damage mechanisms and their analytical interpretation must still be confirmed by ongoing research.…”

A Method to reduce calculation time for FE simulations using constitutive material models

“…Here, as an addition also data points and calculation results performed with FEMEXT in the past from 10,11,13 are shown. Those data include experiments with durations up to 7500 h at notched specimens and 3000 h at cruciform specimens.…”