Assessment of remaining creep life using accelerated stress-rupture tests

Abstract

The use of accelerated stress-rupture tests to determine the remaining creep life of precrept 1Cr–O·5Mo steel has been examined. It was not possible to relate the results of increased-stress tests to remaining creep life successfully, but satisfactory correlations were achieved when acceleration was performed by raising the test temperature. The success of the increased-temperature type of testing is sufficient to Justify the examination of other degrees of damage and other alloys. Life-fraction summations have been shown to be Justified in two-stage sequences where the second stage involves increased temperatures, but not where it involves increased stresses. The life-fraction rule was more valid for temperature changes when the ‘area-modified’ stress concept was used.