wrinkling

Diffusion-induced wrinkling instability in a circular poroelastic plate

Submitted by Cai Shengqiang on Wed, 01/21/2015 - 18:06

wrinkling

diffusion

A poroelastic material can imbibe solvent and swell. When the material swells inhomogeneously or

swells under external constraints, stresses can develop inside the material. The stresses can trigger

mechanical instabilities in the material or even break the material, which have been often observed

in experiments. In this paper, we study the wrinkling instability of a circular poroelastic plate, in

the process of solvent molecules migrating into the plate from the edge. The critical conditions for

Multiple bifurcations in wrinkling analysis of thin films on compliant substrates

Submitted by Fan Xu on Mon, 01/05/2015 - 08:55

research

wrinkling

Buckling and Post buckling

thin film

bifurcation

perturbation

F. Xu, M. Potier-Ferry, S. Belouettar, H. Hu

International Journal of Non-Linear Mechanics (2014), http://dx.doi.org/10.1016/j.ijnonlinmec.2014.12.006

Abstract:

Probing the intermediate states between rolling-up and wrinkling thin films

Submitted by Peter Cendula on Wed, 10/08/2014 - 09:27

thin film

carbon nanoscrolls

wrinkling

wrinkling instability

crack

xrd

Self-positioned nanomembranes such as rolled-up tubes and wrinkled thin films have been potential systems for a variety of applications and basic studies on elastic properties of nanometer-thick systems. Although there is a clear driving force towards elastic energy minimization in each system, the exploration of intermediate states where specific characteristics could be chosen by a slight modification of a processing parameter had not been experimentally realized.

3D finite element modeling for instabilities in thin films on soft substrates

Submitted by Fan Xu on Tue, 07/15/2014 - 08:15

Xu, F., Potier-Ferry, M., Belouettar, S., Cong, Y.,

International Journal of Solids and Structures (2014), doi: http://dx.doi.org/10.1016/j.ijsolstr.2014.06.023

Abstract:

A Dynamic Finite Element Method for Inhomogeneous Deformation and Electromechanical Instability of Dielectric Elastomers

Submitted by Harold S. Park on Sun, 05/06/2012 - 17:11

A kinetics approach to surface wrinkling of elastic films

Submitted by Rui Huang on Wed, 02/29/2012 - 02:20

research

thin film

wrinkling

R. Huang Group Research

This chapter summarizes our works on surface wrinkling of elastic thin films, taking a kinetics approach as a physical pathway to both ordered and disordered wrinkle patterns.

Journal Club Theme of February 2012: Elastic Instabilities for Form and Function

Submitted by Douglas P Holmes on Tue, 01/31/2012 - 22:04

Cardboard rolls on the nanoscale

Submitted by Peter Cendula on Wed, 01/12/2011 - 16:08

Everybody knows that cardboard paper can be a highly
anisotropic material. You can easily bend or roll it in one direction
and it is stiff in the other. If you take a close look you will find
that the paper is periodically buckled along one direction. We have now
exploited this phenomenon on the nanoscale to define the roll-up
direction of ultra-thin membranes on a substrate surface.

Post-doctoral position at Univ. Pittsburgh: soft tissue buckling

Submitted by velankar on Mon, 09/20/2010 - 13:40

postdoctoral position

soft tissue mechanics

folding

post doc

postbuckling

A post-doctoral position is available in the lab of Sachin Velankar at the University of Pittsburgh to conduct experimental research on buckling of soft tissues in cephalopods (octopus or cuttlefish).