Statistical properties of creep rupture data distribution for STS304 stainless steels

The aim of the work is the investigation of the statistical properties of short-term creep rupture characteristic values in STS304 stainless steels. From short-term creep rupture tests performed by constant stresses at three different elevated temperatures 600, 650 and 700 °C, the scatter characteristics of short-term creep rupture data, and the probability distribution characteristics were examined for rupture time, total creep rate, steady state creep rate and initial strain. The influence of temperature on the statistical scatters (coefficient of variation) of rupture time, initial strain and total creep rate generally decreased with increasing creep testing temperature. The influence of stress on the statistical scatter (coefficient of variation) of rupture time was smaller with increasing stresses. The probability distribution functions (PDFs) of short-term creep rupture data were well followed 2-parameter Weibull distribution.