Combined load and displacement controlled test results are being used to develop and verify a simplified component design methodology for elevated temperature service. A key feature of the proposed design methodology is the use of rules for the evaluation of strain limits that are based on the application of elastic-perfectly plastic (EPP) analysis method with a pseudo yield stress to bound component response to applied loadings. The resulting strain ranges would then be used as input to the evaluation of creep-fatigue damage. This paper describes testing with two separate servo-hydraulic machines that are electronically coupled in parallel to represent combined loading effects on a two-bar test configuration.

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