Fatigue and monotonic properties of an interstitial free steel sheet (FMPIF)

In the present work, the monotonic and low cycle fatigue properties of a thin sheet produced from an interstitial free steel containing titanium additions were investigated. A special grip alignment fixture permitted the fatigue tests be conducted under deformation control and completely reversed cyclic strain. The material presented different fatigue behavior for the transverse and longitudinal directions, related to the rolling direction. A comparison between the monotonic and cyclic stress—strain curves in the transverse direction showed that the material exhibits cyclic hardening at all tested strain amplitudes. The strain—life relationship was obtained for the transverse direction; buckling of longitudinal specimens made it impossible to obtain such a relationship.