title: Oblique wrinkles.
abstract: We prove theoretically that when a soft solid is subjected to an extreme deformation, wrinkles can form on its surface at an angle that is oblique to a principal direction of stretch. These oblique wrinkles occur for a strain that is smaller than the one required to obtain wrinkles normal to the direction of greatest compression. We go on to explain why they will probably never be observed in real-world experiments.This article is part of the themed issue 'Patterning through instabilities in complex media: theory and applications.'
authors.affiliation: Dipartimento di Scienze Matematiche DISMA G. L. Lagrange, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Carfagna
authors.affiliation: School of Mathematics, Statistics and Applied Mathematics, NUI Galway, University Road, Galway, Ireland michel.destrade@nuigalway.ie.|School of Mechanical and Materials Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
authors.forename: M
authors.identifier: http://orcid.org/0000-0002-6266-1221
authors.initials: M
authors.lastname: Destrade
authors.affiliation: School of Mathematics, Statistics and Applied Mathematics, NUI Galway, University Road, Galway, Ireland.|School of Mathematics, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
authors.forename: A L
authors.identifier: http://orcid.org/0000-0002-3229-5451
authors.initials: AL
authors.lastname: Gower
authors.affiliation: Dipartimento di Scienze Matematiche DISMA G. L. Lagrange, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Grillo
keywords: coated half-space; incremental stability; wrinkling