Authors: H. F. S. G. Pereira, A. M. P. Jesus, A. S. Ribeiro, A. A. Fernandes

The paper summarizes some main results achieved by authors in recent research on fatigue damage behaviour under variable amplitude loading. The fatigue damage behaviour of the P355NL1 steel is investigated as well as of a double sided notched rectangular plate made of P355NL1 steel. Block loading is applied to smooth and notched specimens. Also, constant amplitude loading is applied to derive the basic fatigue strength data for damage calculations according to existing damage rules. Nonlinear fatigue damage evolution with load sequential effects has been found for the P355NL1 steel and for the structural component

H. F. S. G. Pereira¹ | A. M. P. Jesus² | A. S. Ribeiro³ | A. A. Fernandes⁴

1Mestre em Engenharia Mecânica, IDMEC – Pólo FEUP, Faculty of Engineering, University of Porto

2Prof. Auxiliar

3Prof. Associado c/ Agregação, Department of Engineering, University of Trás-os-Montes e Alto Douro

4Prof. Catedrático, DEMEGI, Faculty of Engineering, University of Porto