STABILITY OF THE ESTIMATES OF THE PARAMETERS OF THE LONG-TERM STRENGTH

The current development of power engineering is accompanied by the increase of the working parameters and extension of the service life of components of power plant. A controlling role is played in these conditions by the methods of predicting the creep strength characteristics for the design service life on the basis of the results of tests of limited duration. The efficiency of the material is estimated using a suitable equation whose parameters are usually determined by statistical processing of the results of long-term tests. Using various partial samples, we obtain different estimates of the parameters. It is therefore essential to determine the stability of the estimates of the parameters of the equations using various partial samples representing the steel grade under examination.