A Phenomenological Predictive Model for Thermo-Mechanical Fatigue of Notched Type 304 Stainless Steel

The behavior of parts subjected to simultaneous thermal and mechanical fatigue loads is an area of research that carries great significance in the power generation, petrochemical, and aerospace industries. Machinery with expensive components undergo varying applications of force while exposed to var...

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Bibliographic Details
Published inAdvanced Materials Research Vol. 1119; pp. 838 - 843
Main Authors Copeland, Andrew T., Besio, Amy K., Karl, Justin O.
Format Journal Article
LanguageEnglish
Published Zurich Trans Tech Publications Ltd 29.07.2015
Subjects
Aircraft components
Austenitic stainless steels
Crack initiation
Fatigue (materials)
Fatigue failure
Fracture mechanics
Mathematical models
Stainless steels
Creep
Stainless Steel
Notch
Prediction
Mechanics
Fatigue
Thermo-Mechanical
Behavior
Modeling
Stress Concentration
LCF
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Summary:The behavior of parts subjected to simultaneous thermal and mechanical fatigue loads is an area of research that carries great significance in the power generation, petrochemical, and aerospace industries. Machinery with expensive components undergo varying applications of force while exposed to variable temperature working fluids. An example case is found in steam turbines, which subject stainless steel blades to cyclic loads from rotation as well as the passing of heated gases. Accurate service life prediction is especially challenging due to the thermo-mechanical loading being present on the complex geometric profile of the blades. This research puts forth a method for determining crack initiation lifetimes in variably-notched type 304 austenitic stainless steel specimens subjected to differing fatigue and thermo-mechanical fatigue conditions. A base analytical model and genetic algorithm were used to develop phenomenology-informed predictions that fall within a factor of two of the actual crack initiation times.
Bibliography:Selected, peer reviewed papers from the 2015 5th International Conference on Key Engineering Materials (ICKEM 2015), March 21-23, 2015, Singapore
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ISBN:3038355135
9783038355137
ISSN:1022-6680
1662-8985
1662-8985
DOI:10.4028/www.scientific.net/AMR.1119.838