TY - JOUR
T1 - Cyclic viscoplasticity testing and modeling of a service-aged P91 steel
AU - Hyde, C. J.
AU - Sun, W.
AU - Hyde, T. H.
AU - Rouse, J. P.
AU - Farragher, T.
AU - O'Dowd, Noel P.
AU - Leen, S. B.
PY - 2014/8
Y1 - 2014/8
N2 - A 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.
AB - A 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.
UR - http://www.scopus.com/inward/record.url?scp=84898798049&partnerID=8YFLogxK
U2 - 10.1115/1.4026865
DO - 10.1115/1.4026865
M3 - Article
AN - SCOPUS:84898798049
SN - 0094-9930
VL - 136
JO - Journal of Pressure Vessel Technology, Transactions of the ASME
JF - Journal of Pressure Vessel Technology, Transactions of the ASME
IS - 4
M1 - 044501
ER -