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Metals 2017, 7(1), 17; doi:10.3390/met7010017

Evaluation of Methods for Estimation of Cyclic Stress-Strain Parameters from Monotonic Properties of Steels

Faculty of Engineering, University of Rijeka, Vukovarska 58, HR-51000 Rijeka, Croatia
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Academic Editor: Filippo Berto
Received: 11 November 2016 / Revised: 28 December 2016 / Accepted: 30 December 2016 / Published: 7 January 2017
(This article belongs to the Special Issue Fatigue Damage)
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Abstract

Most existing methods for estimation of cyclic yield stress and cyclic Ramberg-Osgood stress-strain parameters of steels from their monotonic properties were developed on relatively modest number of material datasets and without considerations of the particularities of different steel subgroups formed according to their chemical composition (unalloyed, low-alloy, and high-alloy steels) or delivery, i.e., testing condition. Furthermore, some methods were evaluated using the same datasets that were used for their development. In this paper, a comprehensive statistical analysis and evaluation of existing estimation methods were performed using an independent set of experimental material data compriseding 116 steels. Results of performed statistical analyses reveal that statistically significant differences exist among unalloyed, low-alloy, and high-alloy steels regarding their cyclic yield stress and cyclic Ramberg-Osgood stress-strain parameters. Therefore, estimation methods were evaluated separately for mentioned steel subgroups in order to more precisely determine their applicability for the estimation of cyclic behavior of steels belonging to individual subgroups. Evaluations revealed that considering all steels as a single group results in averaging and that subgroups should be treated independently. Based on results of performed statistical analysis, guidelines are provided for identification and selection of suitable methods to be applied for the estimation of cyclic stress-strain parameters of steels. View Full-Text
Keywords: estimation methods; monotonic properties; cyclic stress-strain parameters; Ramberg-Osgood; steel grouping; statistical analysis estimation methods; monotonic properties; cyclic stress-strain parameters; Ramberg-Osgood; steel grouping; statistical analysis
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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. (CC BY 4.0).

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Marohnić, T.; Basan, R.; Franulović, M. Evaluation of Methods for Estimation of Cyclic Stress-Strain Parameters from Monotonic Properties of Steels. Metals 2017, 7, 17.

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