We demonstrate a novel approach for controlling the formation of line-defects in wrinkling patterns by introducing step-like changes in the Young's modulus of elastomeric substrates supporting thin, stiff layers. Wrinkles are formed upon treating the poly(dimethylsiloxane) (PDMS) substrates by UV/Ozone (UVO) exposure in a uniaxially stretched state and subsequent relaxation. Line defects such a...

We examine the wettability of rough surfaces through a measurement approach that harnesses a wrinkling instability to produce model substrate topographies. Specifically, we probe the wetting of liquids on anisotropic micro-wrinkled features that exhibit well-defined aspect ratios (amplitude versus wavelength of the wrinkles) that can be actively tuned. Our study provides new insight into the we...

We present a general analytical model for determining the location and pattern of wrinkles in thin membranes and for making preliminary estimates of their wavelength and amplitude. A rectangular membrane under simple shear and a square membrane subject to corner loads are analysed. In the first problem, our model predicts the wavelength and the wrinkle amplitude to be respectively inversely pro...

Motivated by the programmes initiated by Taubes and Perutz, we study the geometry of near-symplectic 4-manifolds and broken Lefschetz fibrations on them. We present a set of four moves which allow us to pass from any given fibration to any other broken fibration which is deformation equivalent to it. The arguments rely on the introduction of a more general class of maps, which we call wrinkled ...

leads to a sequence of BVPs for φn in the unperturbed domain (r > a); φ0 is the unperturbed solution and subsequent φn are forced by φm with m < n. The idea behind the boundary perturbation technique is old and familiar. For example, it is used in the theory of small-amplitude water waves, wherein the nonlinear boundary conditions on the (unknown) free surface z = F (x, y) are ‘linearized’ abou...

An approach for the intelligent determination of the appeared wrinkles in the robotized handling of non-rigid materials such as fabrics is presented. A machine vision system reads the wrinkles and a robotic manipulator controller is used to eliminate the wrinkles of a fabric. The machine vision system is used in order to capture an image of the wrinkled or wrinkle-free fabric. The direction of ...

Cutis laxa is a term that refers to markedly loose skin that is not hyperelastic. It is regarded as a genetically heterogeneous group of diseases and is presently divided into five types. We report a male patient with type II autosomal recessive disease. The patient was the third child of first-cousin consanguineous, healthy parents. His two siblings died a few hours after birth. One of the sib...