Vormwald, Michael ; Hertel, Olaf ; Kaffenberger, Matthias (2012)
Transferability of fatigue data.
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
The initiation of a fatigue crack is a much localised physical phenomenon. In most actual codes of practise local stresses and strains are correlated to total failure life including the crack growth stage. Transferability is therefore limited and can only be established by a rigorous separation in initiation and propagation stages, the latter to be treated by means of fracture mechanics. Even for cases with assumed minor importance of the crack propagation stage – the subject addressed in this paper – it is essential to consider the size effect for improving data transferability. There are two classical views on size effect phenomena: a geometrical and a statistical. The weakest link theory provides a generally accepted tool to take the statistical size effect into account. Examples for welded and non-welded structures show that acceptable strength assessments are achieved applying this tool. However, the somehow diffusely defined geometrical size effect must be called additionally. The geometrical size effect is here interpreted in term of fracture mechanics based arguments for non-welded structures. For welded joints an application of Neuber’s micro structural support theory is presented, instead. Both methods give reasonable accuracies in fatigue strength assessments. However, an explanation of fatigue of welds based on fracture mechanics arguments remains to be done starting from micro structural issues.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Vormwald, Michael ; Hertel, Olaf ; Kaffenberger, Matthias |
| Art des Eintrags: | Bibliographie |
| Titel: | Transferability of fatigue data |
| Sprache: | Englisch |
| Publikationsjahr: | 2012 |
| Ort: | Coimbra |
| Buchtitel: | Proc. XIII Portuguese Conf. on Fracture |
| Band einer Reihe: | ISBN 978-989-97701-0-2 |
| Kurzbeschreibung (Abstract): | The initiation of a fatigue crack is a much localised physical phenomenon. In most actual codes of practise local stresses and strains are correlated to total failure life including the crack growth stage. Transferability is therefore limited and can only be established by a rigorous separation in initiation and propagation stages, the latter to be treated by means of fracture mechanics. Even for cases with assumed minor importance of the crack propagation stage – the subject addressed in this paper – it is essential to consider the size effect for improving data transferability. There are two classical views on size effect phenomena: a geometrical and a statistical. The weakest link theory provides a generally accepted tool to take the statistical size effect into account. Examples for welded and non-welded structures show that acceptable strength assessments are achieved applying this tool. However, the somehow diffusely defined geometrical size effect must be called additionally. The geometrical size effect is here interpreted in term of fracture mechanics based arguments for non-welded structures. For welded joints an application of Neuber’s micro structural support theory is presented, instead. Both methods give reasonable accuracies in fatigue strength assessments. However, an explanation of fatigue of welds based on fracture mechanics arguments remains to be done starting from micro structural issues. |
| Freie Schlagworte: | Fatigue, size effect, transferability |
| Fachbereich(e)/-gebiet(e): | 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut für Stahlbau und Werkstoffmechanik > Fachgebiet Werkstoffmechanik 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut für Stahlbau und Werkstoffmechanik 13 Fachbereich Bau- und Umweltingenieurwissenschaften |
| Hinterlegungsdatum: | 30 Jan 2015 13:36 |
| Letzte Änderung: | 02 Feb 2015 08:44 |
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