Cyclic viscoplasticity testing and modeling of a service-aged P91 steelTools Hyde, Christopher J., Sun, Wei, Hyde, T.H., Rouse, J.P., Farragher, T., O'Dowd, Noel P. and Leen, S.B. (2014) Cyclic viscoplasticity testing and modeling of a service-aged P91 steel. Journal of Pressure Vessel Technology, 136 (4). 044501/1-044501/5. ISSN 1528-8978 Full text not available from this repository.
Official URL: http://pressurevesseltech.asmedigitalcollection.asme.org/article.aspx?articleid=1832496
AbstractA service-aged P91 steel was used to perform an experimental program of cyclic mechanical testing in the temperature range of 400 °C–600 °C, under isothermal conditions, using both saw-tooth and dwell (inclusion of a constant strain dwell period at the maximum (tensile) strain within the cycle) waveforms. The results of this testing were used to identify the material constants for a modified Chaboche, unified viscoplasticity model, which can deal with rate-dependant cyclic effects, such as combined isotropic and kinematic hardening, and time-dependent effects, such as creep, associated with viscoplasticity. The model has been modified in order that the two-stage (nonlinear primary and linear secondary) softening which occurs within the cyclic response of the service-aged P91 material is accounted for and accurately predicted. The characterization of the cyclic viscoplasticity behavior of the service-aged P91 material at 500 °C is presented and compared to experimental stress–strain loops, cyclic softening and creep relaxation, obtained from the cyclic isothermal tests.
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