High speed, high resolution infrared thermography, as a non contact, full field, and nondestructive technique, was used to study the temperature variations of a cobalt based ULTIMET alloy subjected to cyclic fatigue. ...High speed, high resolution infrared thermography, as a non contact, full field, and nondestructive technique, was used to study the temperature variations of a cobalt based ULTIMET alloy subjected to cyclic fatigue. During each fatigue cycle, the temperature oscillations, which were due to the thermal elastic plastic effects, were observed and related to stress-strain analyses. The change of temperature during fatigue was utilized to reveal the accumulation of fatigue damage. A constitutive model was developed for predicting the thermal and mechanical responses of ULTIMET alloy subjected to cyclic deformation. The model was constructed in light of internal state variables, which were developed to characterize the inelastic strain of the material during cyclic loading. The predicted stress-strain and temperature responses were found to be in good agreement with the experimental results.展开更多
System analysis is made in this paper of the coal-fired MHD/steam combined cycle pilot power plant in the size range tens of MWe. System performance are presented of such plants with three sizes: one 12 MWe unit, two ...System analysis is made in this paper of the coal-fired MHD/steam combined cycle pilot power plant in the size range tens of MWe. System performance are presented of such plants with three sizes: one 12 MWe unit, two 12 MWe units and one 50 MWe unit which are considered as retrofits to the existing Beijing No.3 Heat and Power Plant. Parametric studies are performed for the 2×12 MWe units and the optimum system pararneters are obtained.展开更多
文摘High speed, high resolution infrared thermography, as a non contact, full field, and nondestructive technique, was used to study the temperature variations of a cobalt based ULTIMET alloy subjected to cyclic fatigue. During each fatigue cycle, the temperature oscillations, which were due to the thermal elastic plastic effects, were observed and related to stress-strain analyses. The change of temperature during fatigue was utilized to reveal the accumulation of fatigue damage. A constitutive model was developed for predicting the thermal and mechanical responses of ULTIMET alloy subjected to cyclic deformation. The model was constructed in light of internal state variables, which were developed to characterize the inelastic strain of the material during cyclic loading. The predicted stress-strain and temperature responses were found to be in good agreement with the experimental results.
文摘System analysis is made in this paper of the coal-fired MHD/steam combined cycle pilot power plant in the size range tens of MWe. System performance are presented of such plants with three sizes: one 12 MWe unit, two 12 MWe units and one 50 MWe unit which are considered as retrofits to the existing Beijing No.3 Heat and Power Plant. Parametric studies are performed for the 2×12 MWe units and the optimum system pararneters are obtained.
