Abstract
Test methods have been sucessfully developed for producing creep and thermal fatigue crack growth in laboratory-sized tubular components subject to multiaxial loading. A potential drop technique is applied to measure crack growth rates, which then provide a basis for the verification of life assessment procedures. Creep crack growth studies have covered an extensive range of alloys: Alloy 800H, 2¼CrlMo and MA956. Additionally the capability of the test facility to study the influence of factors such as environment and weldment microstructures on the failure mechanisms is also demonstrated. The thermal fatigue simulations have focused on 3 16SS. Finite element analysis of the temperature distribution and resulting stresses allows the experimental thermal fatigue crack growth rates to be correlated with isothermal fatigue crack growth data.
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