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dc.contributor.authorTankasala, Harikaen
dc.contributor.authorDeshpande, Vikramen
dc.contributor.authorFleck, Normanen
dc.date.accessioned2018-11-17T00:30:34Z
dc.date.available2018-11-17T00:30:34Z
dc.date.issued2015-09-01en
dc.identifier.issn1758-826X
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/285336
dc.description.abstractThe dependence of the fracture toughness of two dimensional elasto-plastic lattices upon relative density and ductility of cell wall material is obtained for four topologies: the triangular lattice, kagome lattice, diamond lattice, and the hexagonal lattice. Crack tip fields are explored, including the plastic zone size and crack opening displacement. The cell walls are treated as beams, with a material response given by the Ramberg-Osgood law. There is choice in the criterion for crack advance, and two extremes are considered: (i) the maximum local tensile strain anywhere in the lattice attains the failure strain, or (ii) the average tensile strain across the cell wall attains the failure strain (which can be identified with the necking strain). The dependence of macroscopic fracture toughness upon failure strain, strain hardening exponent and relative density are obtained for each lattice, and scaling laws are derived. The role of imperfections in degrading the fracture toughness is assessed by random movement of the nodes. The paper provides a strategy for obtaining lattices of high toughness at low density, thereby filling gaps in material property space.
dc.publisherWorld Scientific
dc.title2013 Koiter Medal Paper: Crack-Tip Fields and Toughness of Two-Dimensional Elasto-Plastic Latticesen
dc.typeArticle
prism.issueIdentifier9en
prism.numberJAM-15-1220;en
prism.publicationDate2015en
prism.publicationNameInternational Journal of Applied Mechanicsen
prism.volume82en
dc.identifier.doi10.17863/CAM.32705
dcterms.dateAccepted2015-06-16en
rioxxterms.versionofrecord10.1115/1.4030666en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2015-09-01en
dc.contributor.orcidTankasala, Harika [0000-0002-9892-154X]
dc.contributor.orcidFleck, Norman [0000-0003-0224-1804]
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idnull (unknown)
cam.issuedOnline2015-06-16en
rioxxterms.freetoread.startdate2016-06-16


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