title: Prescribed pattern transformation in swelling gel tubes by elastic instability.
abstract: We present a study on swelling-induced circumferential buckling of tubular shaped gels. Inhomogeneous stress develops as the gel swells under mechanical constraints, which gives rise to spontaneous buckling instability without an external force. Full control over the postbuckling pattern is experimentally demonstrated. A simple analytical model is developed using elastic energy to predict stability and postbuckling patterns upon swelling. Analysis reveals that the height to diameter ratio is the most critical design parameter to determine the buckling pattern, which agrees well with experimental and numerical results.
authors.affiliation: Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Howon
authors.initials: H
authors.lastname: Lee
authors.forename: Jiaping
authors.initials: J
authors.lastname: Zhang
authors.forename: Hanqing
authors.initials: H
authors.lastname: Jiang
authors.forename: Nicholas X
authors.initials: NX
authors.lastname: Fang