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research-article

On the evaluation and consideration of fracture mechanical notch support within a creep fatigue lifetime assessment

[+] Author and Article Information
Christian Kontermann

Chair and Institute of Materials Technology, Technical University Darmstadt, D-64283 Darmstadt - Germany
kontermann@mpa-ifw.tu-darmstadt.de

Henning Almstedt

Siemens AG, Power and Gas Division, D-45478 Muelheim an der Ruhr - Germany
henning.almstedt@siemens.com

Falk Mueller

Chair and Institute of Materials Technology, Technical University Darmstadt, D-64283 Darmstadt - Germany
fmueller@mpa-ifw.tu-darmstadt.de

Matthias Oechsner

Chair and Institute of Materials Technology, Technical University Darmstadt, D-64283 Darmstadt - Germany
oechsner@mpa-ifw.tu-darmstadt.de

1Corresponding author.

ASME doi:10.1115/1.4040733 History: Received June 22, 2018; Revised June 26, 2018

Abstract

Changes within the global energy market and a demand for a more flexible operation of gas- and steam-turbines lead to higher utilization of main components and raise the question how to deal with this challenge. One strategy to encounter this is to increase the accuracy of the lifetime assessment by quantifying and reducing conservatisms. At first the impact of considering a fracture mechanical notch support under creep-fatigue loading is studied by discussing the results of an extensive experimental program performed on notched round-bars under global strain control. A proposal how to consider this fracture mechanical notch support within a lifetime assessment is part of the discussion of the second part. Here, a theoretical FEM-based concept is introduced and validated by comparing the theoretical prediction with the results of the previously mentioned experimental study. Finally, the applicability of the developed and validated FEM-based procedure is demonstrated.

Copyright (c) 2018 by ASME
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