alexa Structural Integrity Problems in Dual-Phase High Ductil
ISSN: 2168-9873

Journal of Applied Mechanical Engineering
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Research Article

Structural Integrity Problems in Dual-Phase High Ductility Steel Bar

Charis Apostolopoulos1* and G. Diamantogiannis2
1Assistant Professor, Department of Mechanical and Aeronautical Engineering, University of Patras, Greece
2Department of Mechanical and Aeronautical Engineering, University of Patras, Greece
Corresponding Author : Charis Apostolopoulos
Assistant Professor Department of Mechanical and Aeronautical Engineering
University of Patras, Greece
Received November 08, 2012; Accepted December 21, 2012; Published December 27, 2012
Citation: Apostolopoulos C, Diamantogiannis G (2012) Structural Integrity Problems in Dual-Phase High Ductility Steel Bar. J Appl Mech Eng 2:115 doi:10.4172/2168-9873.1000115
Copyright: © 2012 Apostolopoulos C, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


In EU regions with intense seismic activity imposing building code improvements like the EC2 and EC8-part3,introduced the use of high performance reinforced steel for example the dual phase B500c steel bar. In particularly earthquake-prone areas, like Greece has been over the past decade, the use of steel B500c is exclusively used in all structures from reinforced concrete. The present study focuses on investigating the mechanical behaviour of the material in the elastic region, through a series of mechanical tensile tests. In the elastic region of most of the steel specimens (15 pre-corroded and 5 non-corroded) a “knee” was observed which appears to be related to the localized detachment of the martensitic cortex from the core of the material. The interesting mechanical behaviour at the interface limit of the martensitic and ferritic-perlitic core on B500c steel bars, was further examined by performing (non destructive) ultrasound testing (C-Scan) and failure analysis using SEM, which led to the confirmation of the structural internal failure.


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