Compressive behavior and failure mechanisms of freestanding and composite 3D graphitic foams

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dc.contributor.authorNakanishi, Kenichi
dc.contributor.authorAria, Adrianus Indrat
dc.contributor.authorBerwind, Matthew
dc.contributor.authorWeatherup, Robert S.
dc.contributor.authorEberl, Christoph
dc.contributor.authorHofmann, Stephan
dc.contributor.authorFleck, Norman A.
dc.date.accessioned2018-08-14T16:19:42Z
dc.date.available2018-08-14T16:19:42Z
dc.date.issued2018-08-09
dc.description.abstractOpen-cell graphitic foams were fabricated by chemical vapor deposition using nickel templates and their compressive responses were measured over a range of relative densities. The mechanical response required an interpretation in terms of a hierarchical micromechanical model, spanning 3 distinct length scales. The power law scaling of elastic modulus and yield strength versus relative density suggests that the cell walls of the graphitic foam deform by bending. The length scale of the unit cell of the foam is set by the length of the struts comprising the cell wall, and is termed level I. The cell walls comprise hollow triangular tubes, and bending of these strut-like tubes involves axial stretching of the tube walls. This length scale is termed level II. In turn, the tube walls form a wavy stack of graphitic layers, and this waviness induces interlayer shear of the graphitic layers when the tube walls are subjected to axial stretch. The thickness of the tube wall defines the third length scale, termed level III. We show that the addition of a thin, flexible ceramic Al2O3 scaffold stiffens and strengthens the foam, yet preserves the power law scaling. The hierarchical model gives fresh insight into the mechanical properties of foams with cell walls made from emergent 2D layered solids.en_UK
dc.identifier.citationNakanishi K, Aria AI Berwind M, et al., Compressive behavior and failure mechanisms of freestanding and composite 3D graphitic foams, Acta Materialia, Volume 159, 15 October 2018, pp.187-196en_UK
dc.identifier.cris21221321
dc.identifier.issn1359-6454
dc.identifier.urihttp://dx.doi.org/10.1016/j.actamat.2018.08.012
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/13397
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectCellular solidsen_UK
dc.subjectChemical vapor deposition (CVD)en_UK
dc.subjectGrapheneen_UK
dc.subjectMicromechanical modelingen_UK
dc.subjectStructural hierarchyen_UK
dc.titleCompressive behavior and failure mechanisms of freestanding and composite 3D graphitic foamsen_UK
dc.typeArticleen_UK

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