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Multiaxial random fatigue of magnesium laserbeam-welded joints - experimental results and numerical fatigue life evaluation

: Bolchoun, A.; Sonsino, Cetin Morris; Kaufmann, Heinz; Melz, Tobias

Postprint (PDF; )

Procedia Engineering 101 (2015), S.61-68
ISSN: 1877-7058
International Conference on Material and Component Performance under Variable Amplitude Loading (VAL) <3, 2015, Prague>
Zeitschriftenaufsatz, Konferenzbeitrag, Elektronische Publikation
Fraunhofer LBF ()
multiaxial random; fatigue; welded joints

Fatigue life of magnesium laserbeam-welds (AZ31 and AZ61 alloys) was assessed experimentally under variable amplitude loadings. The specimens were subjected to load-controlled cyclic loadings. The tests were carried out using a Gauss-distributed amplitude sequence of length Ls = 5104 cycles and loading ratio R=-1 under pure axial, pure torsion as well as in-phase and out-of-phase combined loadings.
The notch stresses were obtained from a linear-elastic FE-model using the reference radius approach with rref = 0.05 mm. The stress-based hypotheses were applied: EESH, SIH, Findley, modified Gough-Pollard. A non-proportionality factor is introduced in order to improve assessment under non-proportional loadings.