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2015
Journal Article
Titel
Multiaxial random fatigue of magnesium laserbeam-welded joints - experimental results and numerical fatigue life evaluation
Abstract
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 L<inf>s</inf> = 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 r<inf>ref</inf> = 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.
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