Abstract
Testing method under the creep-fatigue conditions has been proposed as the ASTM standard E2714-09. In accordance with the ASTM standard, round bar smooth specimen have been recommended as a testing specimen. Additionally, creep-fatigue crack initiation and growth life are usually defined as the attainment of a specific rate of decrease in the maximum tensile stress or the modulus of elasticity ratios. However, these criterions of crack initiation and growth life on ASTM standard are not characterized from a mechanical view point. In this study, the creep-fatigue crack initiation and growth tests for P92 were conducted using circular notched round bar specimens under strain controlled conditions. An attempt is made to measure the crack length during the tests by DCPD method, which results in the establishment of high accuracy crack length measurement. Additionally, the criterions of crack initiation and growth life under the creep-fatigue interaction conditions were discussed.
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