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An asymptotic analysis of the buckling of a highly shear-resistant vesicle

Published online by Cambridge University Press:  25 June 2009

SYLVAIN REBOUX ,
GILES RICHARDSON  and
OLIVER E. JENSEN
SYLVAIN REBOUX
Affiliation:
School of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK email: oliver.jensen@nottingham.ac.uk
GILES RICHARDSON
Affiliation:
School of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK email: oliver.jensen@nottingham.ac.uk
OLIVER E. JENSEN
Affiliation:
School of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK email: oliver.jensen@nottingham.ac.uk
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Abstract

The static compression between two smooth plates of an axisymmetric capsule or vesicle is investigated by means of asymptotic analysis. The governing equations of the vesicle are derived from thin-shell theory and involve a bending stiffness B, a shear modulus H, the unstressed vesicle radius a and a constant surface-area constraint. The sixth-order free-boundary problem obtained by a balance-of-forces approach is addressed in the limit when the dimensionless parameter C = Ha2/B is large and the plate displacements are small. When the plate displacement is of order aC−1/2, the vesicle undergoes a sub-critical buckling instability which is captured by leading-order asymptotics. Asymptotic linear and quadratic force–displacement relations for the pre- and post-buckled solutions are determined. The leading-order post-buckled solution is described by a simple fourth-order problem, exhibiting stress-focusing with stretching and bending confined to a narrow boundary layer. In contrast, in the pre-buckled state, stretching occurs over a larger length scale than bending. The results are in good qualitative agreement with numerical simulations for finite values of C.

Type
Papers
Information
European Journal of Applied Mathematics , Volume 20 , Issue 6 , December 2009 , pp. 479 - 518
Copyright
Copyright © Cambridge University Press 2009

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