dc.contributor.author | Balbi, Valentina | |
dc.contributor.author | Trotta, Antonia | |
dc.contributor.author | Destrade, Michel | |
dc.contributor.author | Annaidh, Aisling Ni | |
dc.date.accessioned | 2019-07-19T13:52:26Z | |
dc.date.available | 2019-07-19T13:52:26Z | |
dc.date.issued | 2019-06-13 | |
dc.identifier.citation | Balbi, 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/C9SM00131J | en_IE |
dc.identifier.issn | 1744-683X | |
dc.identifier.uri | http://hdl.handle.net/10379/15279 | |
dc.description.abstract | We 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.sponsorship | We 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.format | application/pdf | en_IE |
dc.language.iso | en | en_IE |
dc.publisher | Royal Society of Chemistry | en_IE |
dc.relation.ispartof | Soft Matter | en |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Ireland | |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ | |
dc.subject | MECHANICAL CHARACTERIZATION | en_IE |
dc.subject | IN-VITRO | en_IE |
dc.subject | TISSUE | en_IE |
dc.subject | SHEAR | en_IE |
dc.subject | DEFORMATION | en_IE |
dc.subject | MODEL | en_IE |
dc.subject | HEAD | en_IE |
dc.title | Poynting effect of brain matter in torsion | en_IE |
dc.type | Article | en_IE |
dc.date.updated | 2019-07-14T13:18:20Z | |
dc.identifier.doi | 10.1039/c9sm00131j | |
dc.local.publishedsource | https://dx.doi.org/10.1039/c9sm00131j | en_IE |
dc.description.peer-reviewed | peer-reviewed | |
dc.contributor.funder | Horizon 2020 | en_IE |
dc.internal.rssid | 16840197 | |
dc.local.contact | Michel Destrade, Room Adb-1002, Áras De Brun, School Of Mathematics, Nui Galway. 2344 Email: michel.destrade@nuigalway.ie | |
dc.local.copyrightchecked | Yes article is OA | |
dc.local.version | PUBLISHED | |
dcterms.project | info:eu-repo/grantAgreement/EC/H2020::MSCA-IF-EF-ST/705532/EU/Mathematical modelling of soft tissues/SOFT-TISSUES | en_IE |
dcterms.project | info:eu-repo/grantAgreement/EC/H2020::MSCA-ITN-ETN/642662/EU/Head protection: a European training network for Advanced Designs in Safety/HEADS | en_IE |
nui.item.downloads | 192 | |