Predicting fatigue life of welded aluminium joints with combined bending and torsion using energy based criteria*
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Tadeusz Lagoda
Abstract
This paper presents calculations of fatigue life of aluminium welded joints (tube-tube and flange-tube) under pure bending, pure torsion, and combined in- and out-of-phase bending with torsion, compared with against experimental results. In order to reduce a multiaxial loading state to an equivalent uniaxial state, an energy-based criteria is applied in the critical plane where cracking occurs. The best results were obtained using the criterion of maximum shear strain energy density for calculating equivalent local stress amplitude for tube-tube welded joints, for both proportional and non-proportional bending with torsion. For flange-tube joints under proportional and non-proportional bending with torsion, the best results were obtained using the criterion of maximum shear and normal strain energy density.
Kurzfassung
Im vorliegenden Beitrag werden Berechnungen zur Lebensdauer von Aluminiumschweißverbindungen (Rohr-Rohr- und Rohr-Flansch-Verbindungen) unter reiner Biegung und unter einer Kombination von Biegung mit Torsion vorgestellt und mit experimentellen Ergebnissen verglichen. Um den multiachsialen Beanspruchungszustand auf eine uniachsiale Belastung zu reduzieren, wurde ein ergiebasiertes Kriterium in der kritischen Ebene angewendet. Die besten Ergebnisse wurden erzielt, indem das Kriterium der maximalen Scher-Verformungsenergiedichte in der kritischen Ebene genutzt wurde, um die äquivalente lokale Spannungsamplitude für die Rohr-Rohr-Schweißungen zu berechnen, und zwar für beides, proportionale und nicht-proportionale Biegung mit Torsion. Für die Rohr-Flansch-Verbindungen unter proportionaler und nicht-proportionaler Biegung mit Torsion wurden die besten Resultate erreicht, indem das Kriterium der maximalen Scherung und der Normaldehnungsenergiedichte angewendet wurde.
References
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© 2006, Carl Hanser Verlag, München
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- DGZfP-Mitteilungen
- Organschaft
- Fachbeiträge/Technical Contributions
- Normung von Prüfverfahren in der Bauakustik
- Fatigue damage of weld seams with and without postweld treatment under multiaxial loading*
- On ratchetting-based models of Wear and Rolling Contact Fatigue* (RCF)
- A constitutive high cycle fatigue damage model – based on the interaction between microplasticity and local damage*
- A statistical measure of the non-proportionality of stresses – investigations and applications*
- Multiaxial fatigue life and strength criteria for non-proportional loading*
- Predicting fatigue life of welded aluminium joints with combined bending and torsion using energy based criteria*
- Reliability evaluation of NDT techniques for Cu-welds for risk assessment of nuclear waste encapsulation
- Vorschau/Preview
- Vorschau
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- DGZfP-Mitteilungen
- Organschaft
- Fachbeiträge/Technical Contributions
- Normung von Prüfverfahren in der Bauakustik
- Fatigue damage of weld seams with and without postweld treatment under multiaxial loading*
- On ratchetting-based models of Wear and Rolling Contact Fatigue* (RCF)
- A constitutive high cycle fatigue damage model – based on the interaction between microplasticity and local damage*
- A statistical measure of the non-proportionality of stresses – investigations and applications*
- Multiaxial fatigue life and strength criteria for non-proportional loading*
- Predicting fatigue life of welded aluminium joints with combined bending and torsion using energy based criteria*
- Reliability evaluation of NDT techniques for Cu-welds for risk assessment of nuclear waste encapsulation
- Vorschau/Preview
- Vorschau
