ESTIMATION OF THE EFFECT OF STRESSES AND TEMPERATURE ON DAMAGE ACCUMULATION IN STEAM PIPE BENDS BY SIMULATING THE ENDURANCE OF THE METAL BY TESTING NOTCHED SPECIMENS

摘要

The endurance of the metal of a bend from steel 12KMMF is simulated under conditions of creep using the results of tests of notched and intact specimens. The dependences of the duration of different damage stages on the stress and the temperature in a range of 520 - 560°C are determined. Computation and experiments are used to determine the geometry of the notched specimens corresponding to different damage stages. The growth in the remaining life of the material damaged by pore chains is estimated upon decrease in the temperature.