In this paper, strength properties of nanoporous materials with spheroidal nanocavities are investigated via a Molecular Dynamics approach applied to a nanovoided aluminium single crystal, in the case of a fixed porosity level, and for prolate, oblate and spherical void shapes. Estimates of the effective strength domain are provided, by considering several mechanical loadings including axisymmetric and shear strain-rate states. Void-shape effects are quantified for different values of the void aspect ratio, mainly resulting in an overall weakening of the sample as the spheroidal nanovoid assumes either an oblate or a prolate shape, in comparison to the case of a spherical void. Finally, it is observed that the computed strength profiles exhibit the following specific features: (i) a strong dependence on the hydrostatic, second-order and third-order deviatoric stress invariants, (ii) more significant void-shape effects for triaxial-expansion stress states with a small hydrostatic component, and (iii) a more pronounced influence of the spheroid shape, as the aspect ratio is varied, in the presence of an oblate nanovoid rather than of a prolate one.

Brach, S., Cherubini, S., Kondo, D., Vairo, G. (2017). Void-shape effects on strength properties of nanoporous materials. MECHANICS RESEARCH COMMUNICATIONS, 86, 11-17 [10.1016/j.mechrescom.2017.10.009].

Void-shape effects on strength properties of nanoporous materials

Brach, S;Cherubini, S;Vairo, G
2017-01-01

Abstract

In this paper, strength properties of nanoporous materials with spheroidal nanocavities are investigated via a Molecular Dynamics approach applied to a nanovoided aluminium single crystal, in the case of a fixed porosity level, and for prolate, oblate and spherical void shapes. Estimates of the effective strength domain are provided, by considering several mechanical loadings including axisymmetric and shear strain-rate states. Void-shape effects are quantified for different values of the void aspect ratio, mainly resulting in an overall weakening of the sample as the spheroidal nanovoid assumes either an oblate or a prolate shape, in comparison to the case of a spherical void. Finally, it is observed that the computed strength profiles exhibit the following specific features: (i) a strong dependence on the hydrostatic, second-order and third-order deviatoric stress invariants, (ii) more significant void-shape effects for triaxial-expansion stress states with a small hydrostatic component, and (iii) a more pronounced influence of the spheroid shape, as the aspect ratio is varied, in the presence of an oblate nanovoid rather than of a prolate one.
2017
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ICAR/08 - SCIENZA DELLE COSTRUZIONI
English
Con Impact Factor ISI
Strength properties; Void-shape effects; Nanoporous materials; Molecular Dynamics
Brach, S., Cherubini, S., Kondo, D., Vairo, G. (2017). Void-shape effects on strength properties of nanoporous materials. MECHANICS RESEARCH COMMUNICATIONS, 86, 11-17 [10.1016/j.mechrescom.2017.10.009].
Brach, S; Cherubini, S; Kondo, D; Vairo, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/200494
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