For a better user experience please update your browser or use Chrome or Firefox browser.
Utilities
Publication detail
HomeFatigue behaviour of welded high-strength components under combined multiaxial variable amplitude loading
Final report
Publication metadata
Flange-tube joints from fine-grained steel Fe E 460 with as-welded and machined welds were investigated under biaxial constant and variable amplitude loading (bending and torsion). In-phase loading can be treated fairly well using the conventional hypotheses (von Mises or Tresca) on a basis of nominal, structural or local strains or stresses. But the influence of out-of-phase loading on fatigue life is severely overestimated if conventional hypotheses are used. However, the introduced hypothesis of the effective equivalent stress (EESH) leads to fairly accurate predictions. For this, the knowledge of local strains or stresses is necessary. This hypothesis considers the fatigue-life reducing influence of out-of-phase loading by taking into account the interaction of local shear stresses acting in different surface planes off the material. Damage accumulation under a Gaussian spectrum can be assessed for in- out-of-phase combined bending and torsion using an allowable damage sum of 0.35 for weldments in the aswelded state and 0.16 for joints with machined weldments with a lower notch factor of the critical area. As an interim design approach, the present and relevant published results indicate that Eurocode 3/IIW S-N curve FAT80/3 (negative inverse slope of 3) is suitable for combined nominal normal and nominal shear stresses acting in-phase, and possibly out-on-phase bending and shear. However, lower curve FAT56/5 is necessary for out-of-phase torsion and bending or tension. Both curves are used in conjunction with the nominal maximum principal stress range occuring during the loading cycle.
- Published:
- Corporate author(s): Directorate-General for Research and Innovation (European Commission) , Fraunhofer Institut für Betriebsfestigkeit LBF (Darmstadt) , The Welding Institute (United Kingdom)
- Personal author(s): Maddox, S. J ; Küppers, M ; Sorsino, C ; Razmjoo, G. R ; Gäth, N
- Themes: Environmental research , Industrial research and development
- Subject: applied research , metalworking , product quality , production improvement , steel
|
Paper
|
|||
| ISSN | ISBN 92-894-2067-7 | DOI | Catalogue number KI-NA-20-050-EN-S |
- Released on EU publications website:
Document viewer
Note:
The publication cannot be displayed in the document viewer. Open web version
You may access it from: Download and languages