TU Darmstadt / ULB / TUbiblio

Assessment of welded joints under thermomechanical and variable amplitude loading

Bosch, Alexander ; Schackert, Sophie ; Schweizer, Christoph ; Vormwald, Michael :
Assessment of welded joints under thermomechanical and variable amplitude loading.
Proceedings of the 5th Symposium on Structural Durability in Darmstadt Eigenverlag: Technische Universität Darmstadt - Institut für Stahlbau und Werkstoffmechanik , Darmstadt
[Konferenz- oder Workshop-Beitrag], (2017)

Kurzbeschreibung (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’.

Typ des Eintrags: Konferenz- oder Workshop-Beitrag (Keine Angabe)
Erschienen: 2017
Autor(en): Bosch, Alexander ; Schackert, Sophie ; Schweizer, Christoph ; Vormwald, Michael
Titel: Assessment of welded joints under thermomechanical and variable amplitude loading
Sprache: Englisch
Kurzbeschreibung (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’.

Buchtitel: Proceedings of the 5th Symposium on Structural Durability in Darmstadt
Ort: Darmstadt
Verlag: Eigenverlag: Technische Universität Darmstadt - Institut für Stahlbau und Werkstoffmechanik
Freie Schlagworte: Variable amplitude loading, thermomechanical fatigue, weld seams, damage calculation, low cycle fatigue
Fachbereich(e)/-gebiet(e): 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut für Stahlbau und Werkstoffmechanik
13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut für Stahlbau und Werkstoffmechanik > Fachgebiet Werkstoffmechanik
13 Fachbereich Bau- und Umweltingenieurwissenschaften
Hinterlegungsdatum: 22 Mai 2017 14:28
Export:

Optionen (nur für Redakteure)

Eintrag anzeigen Eintrag anzeigen