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Assessment of welded joints under thermomechanical and variable amplitude loading

Bosch, Alexander and Schackert, Sophie and Schweizer, Christoph and Vormwald, Michael (2017):
Assessment of welded joints under thermomechanical and variable amplitude loading.
In: Proceedings of the 5th Symposium on Structural Durability in Darmstadt, Darmstadt, Eigenverlag: Technische Universität Darmstadt - Institut für Stahlbau und Werkstoffmechanik, ISBN 978-3-939195-55-9,
[Conference or Workshop Item]

Abstract

The aim of the current work is to develop improved concepts for the prediction of fatigue lifetime under variable amplitude loading including plastic deformation and thermomechanical fatigue of welded joints made of the austenitic stainless steel X6CrNiNb18-10. Local strain amplitudes are located in the regime of low cycle fatigue which is dominated by short crack growth. This can best be described by nonlinear fracture mechanics. To develop a fracture mechanics based lifetime model, different experiment types are carried out to estimate the influence of loading history, thermal cycling und mean stresses. For the evaluation different estimation concepts are used: Palmgren-Miner’s classic linear damage accumulation rule as well as the damage parameter established by Smith, Watson and Topper and a damage parameter based on the cyclic effective J-Integral. The differences in the concepts will be highlighted and used for further considerations of how to advance the lifetime prediction model.

The presented work gives an overview of the preliminary results of the current work on the AiF research project 18842 N ‘Extended damage concepts for thermomechanical loading under variable amplitudes and plastic deformation’.

Item Type: Conference or Workshop Item
Erschienen: 2017
Creators: Bosch, Alexander and Schackert, Sophie and Schweizer, Christoph and Vormwald, Michael
Title: Assessment of welded joints under thermomechanical and variable amplitude loading
Language: English
Abstract:

The aim of the current work is to develop improved concepts for the prediction of fatigue lifetime under variable amplitude loading including plastic deformation and thermomechanical fatigue of welded joints made of the austenitic stainless steel X6CrNiNb18-10. Local strain amplitudes are located in the regime of low cycle fatigue which is dominated by short crack growth. This can best be described by nonlinear fracture mechanics. To develop a fracture mechanics based lifetime model, different experiment types are carried out to estimate the influence of loading history, thermal cycling und mean stresses. For the evaluation different estimation concepts are used: Palmgren-Miner’s classic linear damage accumulation rule as well as the damage parameter established by Smith, Watson and Topper and a damage parameter based on the cyclic effective J-Integral. The differences in the concepts will be highlighted and used for further considerations of how to advance the lifetime prediction model.

The presented work gives an overview of the preliminary results of the current work on the AiF research project 18842 N ‘Extended damage concepts for thermomechanical loading under variable amplitudes and plastic deformation’.

Title of Book: Proceedings of the 5th Symposium on Structural Durability in Darmstadt
Place of Publication: Darmstadt
Publisher: Eigenverlag: Technische Universität Darmstadt - Institut für Stahlbau und Werkstoffmechanik
ISBN: 978-3-939195-55-9
Uncontrolled Keywords: Variable amplitude loading, thermomechanical fatigue, weld seams, damage calculation, low cycle fatigue
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute of Steel Constructions and Material Mechanics
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
Date Deposited: 22 May 2017 14:28
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