The tensile ductility of cellular Solids: The role of imperfections

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cam.issuedOnline2016-10-11
dc.contributor.authorRonan, W
dc.contributor.authorDeshpande, VS
dc.contributor.authorFleck, NA
dc.contributor.orcidFleck, Norman [0000-0003-0224-1804]
dc.date.accessioned2018-11-19T16:50:11Z
dc.date.available2018-11-19T16:50:11Z
dc.date.issued2016-12-15
dc.description.abstract© 2016 Metallic and polymeric foams typically possess a low tensile failure strain of a few percent despite the fact that the parent solid can have high ductility (10% or more). This is remarkable as foams are bending-dominated in their structural response, and it is widely accepted that beams have a high ductility in bending compared to a bar in uniaxial tension. Possible reasons for this paradox are explored for a 2D hexagonal honeycomb, and for a so-called ‘lotus cellular material’, made from an elastic-plastic parent solid. Finite element simulations reveal that there is only a small drop in tensile ductility due to the presence of Plateau borders or due to the random misalignment of nodes; a much greater drop in ductility results from missing cell walls (equivalent to misshapen cells) or to the presence of stiff inclusions. The drop in ductility due to inclusions is associated with the multi-axial stress state that exists in their vicinity. This study emphasises the need for a uniform microstructure in order for foams to possess a high macroscopic ductility.
dc.identifier.doi10.17863/CAM.32785
dc.identifier.eissn1879-2146
dc.identifier.issn0020-7683
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/285425
dc.publisherElsevier BV
dc.publisher.urlhttp://dx.doi.org/10.1016/j.ijsolstr.2016.10.004
dc.subjectCellular foams
dc.subjectElastic plastic solids
dc.subjectFinite element
dc.subjectFoam structures
dc.subjectMicro-mechanics
dc.subjectStress strain
dc.subjectTension
dc.titleThe tensile ductility of cellular Solids: The role of imperfections
dc.typeArticle
dcterms.dateAccepted2016-10-10
prism.endingPage213
prism.publicationDate2016
prism.publicationNameInternational Journal of Solids and Structures
prism.startingPage200
prism.volume102-103
rioxxterms.licenseref.startdate2016-12-15
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review
rioxxterms.versionAM
rioxxterms.versionofrecord10.1016/j.ijsolstr.2016.10.004
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