Evaluation of Fatigue Properties of S355 J2 and S355 J0 by Using ProFatigue Software

The use of S355 high strength steel in civil engineering to design structures of bridges, cranes or simple engineering parts allows material and economical savings to be achieved meeting the strict construction requirements. The knowledge of the fatigue resistance of material plays the key role during design and maintenance of the bridge structures. In the paper the fatigue behavior of S355 J2 and S355 J0 steels are analyzed using statistical models. The data consist of results from low cycle and high cycle fatigue for a variety of specimens. In particular, the software ProFatigue is used for derivation of the probabilistic S–N field from experimental fatigue data. The program, based on a former regression Weibull model, allows the estimation of the parameters involved in the S–N field, providing an advantageous application of the stress based approaches in the fatigue design of mechanical components. The results obtained are compared with the usual used Wohler-curve, usually used, represented as a straight line in a double-logarithmic scale.