Starting from a polymeric-fluid droplet, by vulcanization of the fluid free surface, curved elastic membranes, several nanometers thick and a few millimeters in diameter, which enclose a constant fluid volume, are produced. In an indentation-type test, carried out by pushing the membrane along its normal by means of a micro-needle, under some conditions, wrinkles are likely to appear around the...

Article history: Received 3 December 2013 Received in revised form 8 July 2014 Available online 23 July 2014

Abstract When a liquid crystal elastomer layer is bonded to an elastic layer, it creates bilayer with interesting properties that can be activated by applying traction at the boundaries or optothermal stimulation. Here, we examine wrinkling responses in three-dimensional nonlinear systems containing monodomain and homogeneous isotropic incompressible hyperelastic such one thin compared other. T...

determination of the optimum loading path (internal pressure- axial feeding) to restrict the bursting, buckling and wrinkling through tube hydroforming process is necessary to produce an acceptable tube. in this paper, the wrinkling and fracture criteria are implemented to an finite element code devoted to the simulation of tube hydroforming processes. using the ansys parametric design language...

We address the partial wetting of liquid drops on ultrathin solid sheets resting on a deformable foundation. Considering the membrane limit of sheets that can relax compression through wrinkling at negligible energetic cost, we revisit the classical theory for the contact of liquid drops on solids. Our calculations and experiments show that the liquid-solid-vapor contact angle is modified from ...

The work described in this paper is concerned with providing a rational asymptotic analysis for the partial wrinkling bifurcation of thin elastic hemispherical segment which upper rim experiences in-plane circular shearing relative to other edge. mathematical structure associated complex-valued boundary eigenvalue problem revealed by using method matched expansions. Our key result three-term fo...

The nanomechanical properties of micropatterned nanomembranes containing gold nanoparticle microarrays were investigated with the buckling instability method. An unusual, complex pattern of buckling instability was observed for the nanoscale polymeric films under compressive stresses. An intriguing two-stage wrinkling was observed for these nanoscale films with spatially correlated instabilitie...

Purpose Tilt table testing mainly evaluates the systemic cardiovascular part of the autonomic nervous system, while it is assumed that the finger wrinkling test assesses the peripheral part of the autonomic nervous system. In this study we explored whether the finger wrinkling test could be a useful test for autonomic dysfunction and whether the clinical evaluation of wrinkling can be improved ...