Nuclear Physics, Radioisotope Fuels, and Protective Components
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Smith, Michael↗
Engineering topics
Romanoski, Glenn R.
Publications and source records attributed to Romanoski, Glenn R..
A model for life predictions of nickel-base superalloys in high-temperature low cycle fatigue
Extensive characterization of low-cycle fatigue damage mechanisms was performed on polycrystalline Rene 80 and IN100 tested in the temperature range from 871 to 1000 C. Low-cycle fatigue life was found to be dominated by propagation of microcracks to a critical size governed by the maximum tensile stress. A model was developed which incorporates a threshold stress for crack extension, a stress-based crack growth expression, and a failure criterion. The mathematical equivalence between this mechanistically based model and the strain-life low-cycle fatigue law was demonstrated using cyclic stress-strain relationships. The model was shown to correlate the high-temperature low-cycle fatigue data of the different nickel-base superalloys considered in this study.
Romanoski, Glenn R.↗