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- W3167174416 abstract "• Multi-scale models of the punch problem of brittle auxetic/non-auxetic structures are established. • Negative Poisson’s ratio effects on the indentation resistance of cellular structures are evaluated. • A punch toughness concept is defined as the failure criterion of indented cellular structures. • Collinear punches problem is investigated. This work investigates the indentation resistance of the auxetic/non-auxetic honeycomb ceramics layer by combining a discrete numerical representation and a continuum analytical model. The indentation depth of honeycombs with varying cell-wall angle and cell-wall thickness are measured. The indentation depth of auxetic honeycombs with negative Poisson’s ratio (NPR) is smaller than that of conventional ones in the premise of the same cell-wall thickness. But on the condition that the honeycombs possess the same relative density, there exists an inverse tendency. The corresponding mechanisms responsible for those trends are revealed. The stress intensity factor (SIF) is defined to characterize the stress singularity at the corner of the punch. The influence of NPR on the magnitudes of SIF is evaluated. A punch toughness concept is defined by a novel multi-scale method as the failure criterion of brittle honeycomb ceramics in indentation tests. The effects of NPR on the punch toughness of honeycombs are discussed. And the empirical formulas of punch toughness varying with the cell-wall thickness and the relative density are summarized. Finally, the NPR effects on the collinear punches problem are detected; the results show that the auxetic performance can significantly weaken the interaction between the punches." @default.
- W3167174416 created "2021-06-22" @default.
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- W3167174416 date "2021-07-01" @default.
- W3167174416 modified "2023-10-17" @default.
- W3167174416 title "Indentation resistance of brittle auxetic structures: Combining discrete representation and continuum model" @default.
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- W3167174416 doi "https://doi.org/10.1016/j.engfracmech.2021.107824" @default.
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