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Fatigue life assessment of welded joints made of the stainless steel X6CrNiNb18‐10 for thermomechanical and variable amplitude loading

Bosch, Alexander and Vormwald, Michael and Schackert, Sophie and Schweizer, Christoph (2018):
Fatigue life assessment of welded joints made of the stainless steel X6CrNiNb18‐10 for thermomechanical and variable amplitude loading.
In: Materials science and engineering technology, WILEY-VCH Verlag, pp. 316-331, 49, (3), ISSN 1521-4052, DOI: 10.1002/mawe.201700196, [Online-Edition: https://onlinelibrary.wiley.com/doi/abs/10.1002/mawe.2017001...],
[Article]

Abstract

The aim of the presented 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 1.4550. 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, and mean stresses. For the evaluation, different estimation concepts based on Palmgren‐Miner's classic linear damage accumulation rule are used: solely calculated by strain ranges, damage parameter established by Smith, Watson and Topper, and a damage parameter based on the cyclic effective J‐integral. The differences in the concepts are highlighted and used for further considerations on how to improve the lifetime prediction models.

Item Type: Article
Erschienen: 2018
Creators: Bosch, Alexander and Vormwald, Michael and Schackert, Sophie and Schweizer, Christoph
Title: Fatigue life assessment of welded joints made of the stainless steel X6CrNiNb18‐10 for thermomechanical and variable amplitude loading
Language: English
Abstract:

The aim of the presented 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 1.4550. 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, and mean stresses. For the evaluation, different estimation concepts based on Palmgren‐Miner's classic linear damage accumulation rule are used: solely calculated by strain ranges, damage parameter established by Smith, Watson and Topper, and a damage parameter based on the cyclic effective J‐integral. The differences in the concepts are highlighted and used for further considerations on how to improve the lifetime prediction models.

Journal or Publication Title: Materials science and engineering technology
Volume: 49
Number: 3
Publisher: WILEY-VCH Verlag
Uncontrolled Keywords: Variable amplitude loading, thermomechanical fatigue, weld seams, damage calculation, short crack growth, 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: 02 May 2018 13:45
DOI: 10.1002/mawe.201700196
Official URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/mawe.2017001...
Alternative keywords:
Alternative keywordsLanguage
Variable Amplituden, thermomechanische Ermüdung, Schweißnähte, Schädigungsrechnung, Kurzrisswachstum, niederzyklische ErmüdungGerman
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