The concept for a general fatigue monitoring is presented in this scientific contribution. It is based on determination of the usage factor and will optimally combine advantages of numerical methods and analytical expressions for determination of fatigue damage and remaining life of the nuclear power plant. During off-line phases a thermal model and a thermoelastic model is used for observed components to evaluate thermoelastic stresses for determination of fatigue damage.
COBISS.SI-ID: 21364775
The paper presents closed form solutions for the temperature and stress fields in a pipe. Through the presented method and results it is possible to determine the delay of appearance of maximum temperature at outer surface and to determine temperature changes, which cannot be captured with measuring the temperatures at the outside surface of the pipe. Calculated alternating stresses show: a) higher frequencies of temperature fluctuation cause lower alternating stresses for thick pipe walls b) higher alternating stress occurs at thinner pipe walls when a pipe is loaded with internal pressure.
COBISS.SI-ID: 22244903