Ermüdungsverhalten einer lasergeschweißten pseudoelastischen NiTi-Legierung unter Biegebeanspruchung

Fatigue behaviour of a laser welded pseudoelastic NiTi alloy under bending stresses The mechanical fatigue of small specimens of a commercial pseudoelastic NiTi alloy produced by laser welding and laser cutting was investigated in strain-controlled bending tests. In comparison with the base material the butt welded specimens showed significantly reduced numbers of cycles to failure. This is mainly caused by higher local strains due to height reductions in the welded joints. Both the welded microstructure and the unwelded one was able to be loaded up to 10⁷ cycles without failure if the strain amplitude remained below 1%.