Fatigue Crack Propagation Limit Curves for High Strength Steels and Their Welded Joints Based on Two-Stage Relationship

  • János Lukács
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)


The objective of the paper is to present the newest results of our complex research work. In order to determine and compare the fatigue resistance, fatigue crack growth tests were performed on S690QL and S960QL quenched and tempered (Q+T) type high strength steels. 15 mm thick base materials (SSAB Weldox 700E and Weldox 960E) were used for our investigations. Welded joints were made from these base materials, using gas metal arc welding (GMAW) with matching (M) filler metals (Thyssen UNION X85 and UNION X96). In the paper, the performance of the welding experiments will be presented; together with the results of the fatigue crack growth (FCG) examinations executed on the base materials (BM) and their welded joints (WJ). Statistical aspects were applied both for presenting the possible crack locations in the base materials and the welded joints, as well as for processing the measured data. Furthermore, the results will be compared with each other, and fatigue crack propagation limit curves will be derived using two-stage relationship.


High strength steel Gas metal arc welding Matching Fatigue crack growth Limit curve 



The presented work was carried out as part of the EFOP-3.6.1-16-2016-00011 “Younger and Renewing UniversityInnovative Knowledge Cityinstitutional development of the University of Miskolc aiming at intelligent specialization” project implemented in the framework of the Széchenyi 2020 program. The realization of this project is supported by the European Union, co-financed by the European Social Fund.


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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.University of MiskolcMiskolc-EgyetemvárosHungary

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