Multiaxial fatigue behaviour of laserbeam-welded thin steel and aluminium sheets under proportional and non-proportional combined loading

Laserbeam-welded overlapped tubular joints made from structural steel St35 (S235 G2T), artificially hardened aluminium alloy AlSi1MgMn T6 (EN AW 6082 T6) and self-hardening aluminium alloy AlMg3.5Mn (EN AW 5042) were investigated under combined proportional and non-proportional axial and torsional l...

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Bibliographic Details
Published in:International journal of fatigue 2011-08, Vol.33 (8), p.992-1005
Main Authors: Wiebesiek, J., Störzel, K., Bruder, T., Kaufmann, H.
Format: Article
Language:English
Subjects:
Aluminium
Aluminium and structural steel
Aluminum base alloys
Equivalence
Evolution
Fatigue (materials)
Laserbeam welds
Local stress concept
Mathematical analysis
Multiaxial fatigue
Proportional and non-proportional loading
Stresses
Structural steels
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Summary:Laserbeam-welded overlapped tubular joints made from structural steel St35 (S235 G2T), artificially hardened aluminium alloy AlSi1MgMn T6 (EN AW 6082 T6) and self-hardening aluminium alloy AlMg3.5Mn (EN AW 5042) were investigated under combined proportional and non-proportional axial and torsional loading with constant amplitudes in the range of 2 × 10 4–1 × 10 7 cycles. The multiaxial fatigue behaviour of these joints was assessed by the notch stress concept with the reference radius r ref = 0.05 mm. The equivalent stresses, especially considering the fatigue life reducing influence of non-proportional loading in comparison to proportional loading, were calculated by a recently developed hypothesis, which is called the Stress Space Curve Hypothesis (SSCH). This hypothesis is based on the time evolution of the stress state during one load cycle.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2010.12.008