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Advances in Materials Science and Engineering
Volume 2016, Article ID 4134021, 8 pages
Research Article

Rapid Determination of the S-N Curve for Steel by means of the Thermographic Method

Faculty of Mechanical Engineering, UTP University of Science and Technology in Bydgoszcz, Aleja Profesora S. Kaliskiego 7, 85-796 Bydgoszcz, Poland

Received 6 December 2015; Revised 24 March 2016; Accepted 31 March 2016

Academic Editor: Paolo Ferro

Copyright © 2016 Adam Lipski. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The paper presents a thermographic method of accelerated determination of the S-N curve. In the presented method, the S-N curve was developed based on energy-related parameter with the assumption of its dependency on the stress amplitude. The tests made on C45 steel and X5CrNi18-10 steel under reversed bending revealed that the S-N curve obtained by accelerated thermographic method fits inside the 95% confidence interval for the S-N curve obtained from the full test.