SEDL / STP / STP1439-EB / STP11326S

Load History in Fatigue: Effect of Strain Amplitude and Loading Path

Aubin, V
Assistant Professors, and Professor, Ecole Centrale de Lille, Laboratoire de Mécanique de Lille UMR CNRS 8107, Villeneuve d'Ascq,

Quaegebeur, P
Assistant Professors, and Professor, Ecole Centrale de Lille, Laboratoire de Mécanique de Lille UMR CNRS 8107, Villeneuve d'Ascq,

Degallaix, S
Assistant Professors, and Professor, Ecole Centrale de Lille, Laboratoire de Mécanique de Lille UMR CNRS 8107, Villeneuve d'Ascq,

Pages: 14    Published: Jan 2005

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Abstract

The low-cycle fatigue behavior of a duplex stainless steel, 60% α — 40% γ, is studied under tension-compression/torsion loading at room temperature and under strain control. It is shown that the duplex stainless steel has an isotropic behavior under cyclic proportional loading. The loading path induces an extra-hardening on cyclic hardening of duplex stainless steel but lower than that on austenitic stainless steels. The effect of loading history is studied in terms of strain amplitude, mean strain, and loading path. It is shown that only histories in strain amplitude and loading path have an effect on the stabilized stress.