PSI - Issue 81

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ScienceDirect

Procedia Structural Integrity 81 (2026) 455–457

© 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2025 organizers Keywords : microdamage; Vickers indentation; prestressing steel; plastic anisotropy. 1. Introduction Hardness tests, traditionally used to evaluate material resistance to localised plastic strain, have many other applications, and may be used at different scales: macro, micro and nano. Materials characterization from hardness tests (multiaxial states) allows one to obtain the elastic-plastic parameters related to material behaviour in the tension test. From the hardness values, a prediction of the stress-strain curve is possible (Jayaraman et al., 1998). In the instrumented tests, a plot of load versus penetration depth is obtained, thus allowing one to determine several parameters of the material characteristic curve (Giannakopoulos and Suresh, 1999; Pelletier, 2006). The slope of the initial part of the unloading curve is related to the elastic properties of the material and the loading curve exhibits a parabolic dependence with the penetration depth of the indentator (Murakami and Itokazu, 1996). Anisotropic materials require the analysis of residual displacement as a consequence of their constitutive anisotropy (Bocciarelli et al., 2005). In this paper an analysis is presented of the evolution of Vickers microhardness in eutectoid steels coming from different stages of a real cold drawing process, analyzing hardness in the two characteristic sections of the wire (transverse and longitudinal). Abstract This paper studies the anisotropy of plastic behaviour in heavily cold drawn pearlitic steels supplied in the form of prestressing steel wires for prestressed concrete, analyzing the evolution of Vickers micro-hardness in progressively drawn eutectoid steels focussing the study on the characteristic sections of the wires. The average value of the Vickers micro-hardness was calculated for each section according to its symmetry, thus studying the variation of these values with cold drawing. VIII International Conference “In -service Damage of Materi als: Diagnostics and Prediction” (DMDP 2025) Anisotropy of plastic behaviour induced by the oriented microstructure in cold drawn pearlitic steels supplied in the form of prestressing wires: A Dalinian Approach Jesús Toribio*, Beatriz González, Juan-Carlos Matos, Viktor Kharin Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain

* Corresponding author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es

2452-3216 © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2025 organizers 10.1016/j.prostr.2026.03.078