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Fatigue assessment of nuclear power plant component subjected to thermal cyclic loading

Bauerbach, Kai and Vormwald, Michael and Rudolph, Jürgen (2009):
Fatigue assessment of nuclear power plant component subjected to thermal cyclic loading.
In: Proceedings of PVP 2009, ASME Pressure Vessels and Piping Division Conference, Prag, In: ISBN 978-0-7918-3854-9, als CD erschienen, [Conference or Workshop Item]

Abstract

Thermal loading conditions of nuclear power plant components cause local stress-strain hystereses. For the fatigue life prediction of nuclear power plant components under thermal cyclic and structural loading a new method based on the local strain approach is to be presented. This method involves finite-element simulations as well as the experience gathered from lifetime assessment methods based on short crack models. The local stresses and strains are obtained from coupledfield FE-analyses. The calculation of the hysteresis-loops relies on appropriate material models and experimentally verified temperature-dependent material parameters in order to describe the elasto-plastic behavior of the material as realistically as necessary. Due to the temperature dependence of the material parameters the resulting hysteresis loops are of non-conventional shapes and similar to those observed under multiaxial nonproportional structural loading. Hence, fatigue methodologies developed for non-proportional loading conditions during the past years bear good prospects for successful application under non-isothermal loading conditions.

Item Type: Conference or Workshop Item
Erschienen: 2009
Creators: Bauerbach, Kai and Vormwald, Michael and Rudolph, Jürgen
Title: Fatigue assessment of nuclear power plant component subjected to thermal cyclic loading
Language: English
Abstract:

Thermal loading conditions of nuclear power plant components cause local stress-strain hystereses. For the fatigue life prediction of nuclear power plant components under thermal cyclic and structural loading a new method based on the local strain approach is to be presented. This method involves finite-element simulations as well as the experience gathered from lifetime assessment methods based on short crack models. The local stresses and strains are obtained from coupledfield FE-analyses. The calculation of the hysteresis-loops relies on appropriate material models and experimentally verified temperature-dependent material parameters in order to describe the elasto-plastic behavior of the material as realistically as necessary. Due to the temperature dependence of the material parameters the resulting hysteresis loops are of non-conventional shapes and similar to those observed under multiaxial nonproportional structural loading. Hence, fatigue methodologies developed for non-proportional loading conditions during the past years bear good prospects for successful application under non-isothermal loading conditions.

Title of Book: Proceedings of PVP 2009, ASME Pressure Vessels and Piping Division Conference
Series Name: ISBN 978-0-7918-3854-9
Volume: als CD erschienen
Place of Publication: Prag
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute of Steel Constructions and Material Mechanics > Fachgebiet Werkstoffmechanik
13 Department of Civil and Environmental Engineering Sciences > Institute of Steel Constructions and Material Mechanics
13 Department of Civil and Environmental Engineering Sciences
Date Deposited: 02 Feb 2015 08:33
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