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Volume 14
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10.3390/met14040433
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Article

Poisson’s Ratio of Selected Metallic Materials in the Elastic–Plastic Region

by
Vladimír Chmelko
1,*,
Tomáš Koščo
1,
Miroslav Šulko
1,
Matúš Margetin
1 and
Jaroslava Škriniarová
2
1
Institute of Applied Mechanics and Mechatronics, Slovak University of Technology in Bratislava, Námestie Slobody 17, 81231 Bratislava, Slovakia
2
Institute of Informatics, Slovak Academy of Sciences, Dúbravská Cesta 9, 84507 Bratislava, Slovakia
*
Author to whom correspondence should be addressed.
Metals 2024, 14(4), 433; https://doi.org/10.3390/met14040433
Submission received: 26 February 2024 / Revised: 30 March 2024 / Accepted: 5 April 2024 / Published: 7 April 2024
(This article belongs to the Special Issue Mechanical Behaviors and Damage Mechanisms of Metallic Materials)
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Abstract

Poisson’s ratio is one of the fundamental characteristics in the material models that are used. In engineering practice, its values are assumed to be constant in the elastic and in the plastic region. In this paper, the conventionally used values of this number for steel materials and aluminum alloys are confronted with experimental results. By using non-contact strain measurements with the DIC (digital image correlation) method, the evolution of the Poisson ratio value in the regions of transition from the elastic to the plastic region as well as in the regions of large plastic deformations was documented. The obtained experimental results are graphically compared using the proposed strain scaling. The gradient of the Poisson ratio changes in the vicinity of the yield stress is significant, indicating the need for a refinement of the material models in this region. Deviations from the conventionally used value of this number were found in the large plastic deformation region. In conclusion, a possible approach for improving the accuracy of simulations in FEM softwares was formulated.
Keywords: Poisson ratio; DIC measurement; plasticity Poisson ratio; DIC measurement; plasticity

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MDPI and ACS Style

Chmelko, V.; Koščo, T.; Šulko, M.; Margetin, M.; Škriniarová, J. Poisson’s Ratio of Selected Metallic Materials in the Elastic–Plastic Region. Metals 2024, 14, 433. https://doi.org/10.3390/met14040433

AMA Style

Chmelko V, Koščo T, Šulko M, Margetin M, Škriniarová J. Poisson’s Ratio of Selected Metallic Materials in the Elastic–Plastic Region. Metals. 2024; 14(4):433. https://doi.org/10.3390/met14040433

Chicago/Turabian Style

Chmelko, Vladimír, Tomáš Koščo, Miroslav Šulko, Matúš Margetin, and Jaroslava Škriniarová. 2024. "Poisson’s Ratio of Selected Metallic Materials in the Elastic–Plastic Region" Metals 14, no. 4: 433. https://doi.org/10.3390/met14040433

APA Style

Chmelko, V., Koščo, T., Šulko, M., Margetin, M., & Škriniarová, J. (2024). Poisson’s Ratio of Selected Metallic Materials in the Elastic–Plastic Region. Metals, 14(4), 433. https://doi.org/10.3390/met14040433

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