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Metals 2017, 7(7), 265; doi:10.3390/met7070265

Low Cycle Fatigue Behaviour of DP Steels: Micromechanical Modelling vs. Validation

1
Institute of Material Research and Testing, Bauhaus-University Weimar, 99421 Weimar, Germany
2
Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109, USA
3
Department of Materials Test Engineering (WPT), TU Dortmund University, D-44227 Dortmund, Germany
*
Authors to whom correspondence should be addressed.
Received: 22 June 2017 / Revised: 5 July 2017 / Accepted: 6 July 2017 / Published: 11 July 2017
(This article belongs to the Special Issue Microstructure based Modeling of Metallic Materials)
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Abstract

This study aims to simulate the stabilised stress-strain hysteresis loop of dual phase (DP) steel using micromechanical modelling. For this purpose, the investigation was conducted both experimentally and numerically. In the experimental part, the microstructure characterisation, monotonic tensile tests and low cycle fatigue tests were performed. In the numerical part, the representative volume element (RVE) was employed to study the effect of the DP steel microstructure of the low cycle fatigue behavior of DP steel. A dislocation-density based model was utilised to identify the tensile behavior of ferrite and martensite. Then, by establishing a correlation between the monotonic and cyclic behavior of ferrite and martensite phases, the cyclic deformation properties of single phases were estimated. Accordingly, Chaboche kinematic hardening parameters were identified from the predicted cyclic curve of individual phases in DP steel. Finally, the predicted hysteresis loop from low cycle fatigue modelling was in very good agreement with the experimental one. The stabilised hysteresis loop of DP steel can be successfully predicted using the developed approach. View Full-Text
Keywords: dual-phase (DP) steel; representative volume element (RVE); dislocation-based model; cyclic deformation; hysteresis curve dual-phase (DP) steel; representative volume element (RVE); dislocation-based model; cyclic deformation; hysteresis curve
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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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MDPI and ACS Style

Moeini, G.; Ramazani, A.; Myslicki, S.; Sundararaghavan, V.; Könke, C. Low Cycle Fatigue Behaviour of DP Steels: Micromechanical Modelling vs. Validation. Metals 2017, 7, 265.

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