RESEARCH PAPER
Accelerated Determination of Fatigue Limit and S-N Curve by Means of Thermographic Method for X5CrNi18-10 Steel
1
Faculty of Mechanical Engineering, Department Laboratory for Research on Materials and Structures, UTP University of Science and Technology, Al. Prof. S. Kaliskiego 7, PL 85-796 Bydgoszcz, Poland
Submission date: 2015-05-08
Acceptance date: 2016-02-08
Online publication date: 2016-03-07
Publication date: 2016-03-01
Acta Mechanica et Automatica 2016;10(1):22-27
KEYWORDS
ABSTRACT
A new thermographic method that enables simultaneous accelerated determination of the fatigue limit and the S-N curve was presented in this paper. The fatigue limit determination method was based on a constant rate of temperature rise occurring in second phase of the specimen fatigue life. The S-N curve determination method was based on energetic parameter with assumption of its dependency on the stress amplitude. The tests made on X5CrNi18-10 steel under reversed bending revealed that the fatigue limit value obtained from accelerated thermographic tests as compared to the value obtained from full test differs by 5.0 %. The S-N curve obtained by accelerated thermographic method fits inside 95 % confidence interval for the S-N curve obtained from full test.
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| eISSN: | 2300-5319 |
| ISSN: | 1898-4088 |
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