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Open AccessArticle

Poisson’s Ratio of Closed-Cell Aluminium Foams

1
Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Dúbravskácesta 9, 845 13 Bratislava, Slovak Republic
2
Department of Mechanics and Strength of Materials, Politehnica University of Timisoara, 1 Mihai Viteazu Avenue, 300 222 Timisoara, Romania
*
Author to whom correspondence should be addressed.
Materials 2018, 11(10), 1904; https://doi.org/10.3390/ma11101904
Received: 10 August 2018 / Revised: 1 October 2018 / Accepted: 3 October 2018 / Published: 7 October 2018
(This article belongs to the Special Issue Advances in Metal Foams)
A nondestructive impulse excitation technique was used to investigate Poisson’s ratio of powder metallurgical pure closed-cell aluminium foams according to ASTM E 1876 within the foam density range of 0.430–1.390 g·cm−3. Instead of a constant value of 0.34, as according to Gibson and Ashby’s assumption for the Poisson’s ratio of metallic foams, the decrease of the Poisson’s ratio with decreasing foam density was observed. Observed Poisson’s ratio data were in the range of 0.21–0.34. To check the validity of the results, the Young’s modulus was calculated using Poisson’s ratio and its dependence on relative density was successfully modelled using the usual power law function with characteristic exponent of 1.72 ± 0.1. This confirms that the obtained experimental results for Poisson’s ratio are valid. Finally, rule of mixture and percolation theory were used to model the observed decrease of Poisson’s ratio with increasing porosity. View Full-Text
Keywords: aluminium foam; closed-cell foam; Poisson’s ratio; porosity; nondestructive testing; modulus of elasticity aluminium foam; closed-cell foam; Poisson’s ratio; porosity; nondestructive testing; modulus of elasticity
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MDPI and ACS Style

Kováčik, J.; Marsavina, L.; Linul, E. Poisson’s Ratio of Closed-Cell Aluminium Foams. Materials 2018, 11, 1904.

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