Strength properties of nanoporous materials: A molecular dynamics approach

Abstract eng:
Strength properties of an aluminium single crystal containing a spherical nanovoid are investigated by means of a Molecular Dynamics (MD) approach, in the case of a fixed porosity level and for different values of the void size. Elasto-plastic mechanical response, under triaxial strain-based conditions and including axisymmetric and shear states, are numerically investigated, and allows to identify the corresponding limit stress states. The dependence of the macroscopic strength properties on all the three stress invariants is quantified. Voidsize effects are clearly shown. In detail, it is observed that reducing the void radius induces a strengthening of the sample. Furthermore, the occurrence and the amount of void-size effects strongly depend on the Lode angle, resulting in a shape transition of both meridian and deviatoric strength surfaces when the void radius is varied.

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