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dc.contributor.authorBalbi, Valentina
dc.contributor.authorTrotta, Antonia
dc.contributor.authorDestrade, Michel
dc.contributor.authorAnnaidh, Aisling Ni
dc.date.accessioned2019-07-19T13:52:26Z
dc.date.available2019-07-19T13:52:26Z
dc.date.issued2019-06-13
dc.identifier.citationBalbi, Valentina, Trotta, Antonia, Destrade, Michel, & Ní Annaidh, Aisling. (2019). Poynting effect of brain matter in torsion. Soft Matter, 15(25), 5147-5153. doi: 10.1039/C9SM00131Jen_IE
dc.identifier.issn1744-683X
dc.identifier.urihttp://hdl.handle.net/10379/15279
dc.description.abstractWe investigate experimentally and model theoretically the mechanical behaviour of brain matter in torsion. Using a strain-controlled rheometer, we perform torsion tests on fresh porcine brain samples. We quantify the torque and the normal force required to twist a cylindrical sample at constant twist rate. Data fitting gives a mean value for the shear modulus of mu = 900 +/- 312 Pa and for the second Mooney-Rivlin parameter of c(2) = 297 +/- 189 Pa, indicative of extreme softness. Our results show that brain always displays a positive Poynting effect; in other words, it expands in the direction perpendicular to the plane of twisting. We validate the experiments with finite element simulations and show that when a human head experiences a twisting motion in the horizontal plane, the brain can experience large forces in the axial direction.en_IE
dc.description.sponsorshipWe thank Badar Rashid for Fig. 1(a–c); David McManus for help with the dissection of pig heads; Xiaolin Li for technical assistance with the rheometer; Christiane Go¨rgen for help with fitting in RStudio; and Giuseppe Saccomandi for insightful discussions on the modelling of torsion. The work has received funding from the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Skłodowska-Curie grant agreements No. 705532 (Valentina Balbi and Michel Destrade) and No. 642662 (Antonia Trotta and Aisling Nı´ Annaidh).en_IE
dc.formatapplication/pdfen_IE
dc.language.isoenen_IE
dc.publisherRoyal Society of Chemistryen_IE
dc.relation.ispartofSoft Matteren
dc.subjectMECHANICAL CHARACTERIZATIONen_IE
dc.subjectIN-VITROen_IE
dc.subjectTISSUEen_IE
dc.subjectSHEARen_IE
dc.subjectDEFORMATIONen_IE
dc.subjectMODELen_IE
dc.subjectHEADen_IE
dc.titlePoynting effect of brain matter in torsionen_IE
dc.typeArticleen_IE
dc.date.updated2019-07-14T13:18:20Z
dc.identifier.doi10.1039/c9sm00131j
dc.local.publishedsourcehttps://dx.doi.org/10.1039/c9sm00131jen_IE
dc.description.peer-reviewedpeer-reviewed
dc.contributor.funderHorizon 2020en_IE
dc.internal.rssid16840197
dc.local.contactMichel Destrade, Room Adb-1002, Áras De Brun, School Of Mathematics, Nui Galway. 2344 Email: michel.destrade@nuigalway.ie
dc.local.copyrightcheckedYes article is OA
dc.local.versionPUBLISHED
dcterms.projectinfo:eu-repo/grantAgreement/EC/H2020::MSCA-IF-EF-ST/705532/EU/Mathematical modelling of soft tissues/SOFT-TISSUESen_IE
dcterms.projectinfo:eu-repo/grantAgreement/EC/H2020::MSCA-ITN-ETN/642662/EU/Head protection: a European training network for Advanced Designs in Safety/HEADSen_IE
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