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Pedro Miguel Nunes Pereira de Almeida Reis

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Publications associées (58)

Finite Element Modeling of Tight Elastic Knots

Paul Grandgeorge, Pedro Miguel Nunes Pereira de Almeida Reis, Paul Johanns, Tomohiko Sano, Changyeob Baek

We present a methodology to simulate the mechanics of knots in elastic rods using geometrically nonlinear, full three-dimensional (3D) finite element analysis. We focus on the mechanical behavior of knots in tight configurations, for which the full 3D defo ...

2020

Hydrodynamic loading of perforated disks in creeping flows

François Gallaire, Lorenzo Siconolfi, Pedro Miguel Nunes Pereira de Almeida Reis, Matteo Pezzulla

We present results from an experimental investigation of a viscous fluid driven through and around porous disks at low and moderate Reynolds number conditions: Re = O(10(-4)-10(-3)) and Re = O(1-10). Specifically, we quantify the hydrodynamic drag that the ...

AMER PHYSICAL SOC2019

Evolution of critical buckling conditions in imperfect bilayer shells through residual swelling

Pedro Miguel Nunes Pereira de Almeida Reis, Matteo Pezzulla, Dong Yan, Anna Lee

We propose and investigate a minimal mechanism that makes use of differential swelling to modify the critical buckling conditions of elastic bilayer shells, as measured by the knockdown factor. Our shells contain an engineered defect at the north pole and ...

ROYAL SOC CHEMISTRY2019

Programmable Aerodynamic Drag on Active Dimpled Cylinders

Pedro Miguel Nunes Pereira de Almeida Reis, Dong Yan, Mark Andrew Guttag

This study demonstrates that the aerodynamic drag profile of a patterned deformable cylinder at high Reynolds numbers can be programmed, on demand, by modifying its topography through pneumatic actuation. The samples used in the experiments comprise a rigi ...

WILEY-V C H VERLAG GMBH2019

Compressible and Electrically Conducting Fibers for Large‐Area Sensing of Pressures

Fabien Sorin, Alexis Gérald Page, Shahrzad Shadman Yazdi, Yunpeng Qu, Pedro Miguel Nunes Pereira de Almeida Reis, Andreas Leber, Dong Yan

Flexible pressure sensors offer a wide application range in health monitoring and human–machine interaction. However, their implementation in functional textiles and wearable electronics is limited because existing devices are usually small, 0D elements, a ...

2019

A Weak Form Implementation of Nonlinear Axisymmetric Shell Equations With Examples

Pedro Miguel Nunes Pereira de Almeida Reis, Matteo Pezzulla

We present a weak form implementation of the nonlinear axisymmetric shell equations. This implementation is suitable to study the nonlinear deformations of axisymmetric shells, with the capability of considering a general mid-surface shape, non-homogeneous ...

2019

Rigidity of hemispherical elastic gridshells under point load indentation

Pedro Miguel Nunes Pereira de Almeida Reis, Changyeob Baek

We present results from physical and numerical experiments on the rigidity of hemispherical gridshells under point load indentation. By systematically exploring the relevant parameters of the system, we provide a scaling law for the rigidity of elastic gri ...

PERGAMON-ELSEVIER SCIENCE LTD2019

Solid structures generated by capillary instability in thin liquid films

Pierre-Thomas Paul Brun, Pedro Miguel Nunes Pereira de Almeida Reis

This paper is associated with a posterwinner of a 2017 APS/DFDMilton van DykeAward for work presented at the DFD Gallery of Fluid Motion. The original poster is available from the Gallery of Fluid Motion. ...

APS2018

Patterns of Carbon Nanotubes by Flow-Directed Deposition on Substrates with Architectured Topographies

Pedro Miguel Nunes Pereira de Almeida Reis

We develop and perform continuum mechanics simulations of carbon nanotube (CNT) deployment directed by a combination of surface topography and rarefied gas flow. We employ the discrete elastic rods method to model the deposition of CNT as a slender elastic ...

American Chemical Society (ACS)2018

Aeroelastic deformation of a perforated strip

Pedro Miguel Nunes Pereira de Almeida Reis, Mark Andrew Guttag

We perform a combined experimental and numerical investigation into the static deformation of perforated elastic strips under uniform aerodynamic loading at high-Reynolds-number conditions. The static shape of the porous strips, clamped either horizontally ...

2018

Form finding in elastic gridshells

Pedro Miguel Nunes Pereira de Almeida Reis, Changyeob Baek

Elastic gridshells comprise an initially planar network of elastic rods that are actuated into a shell-like structure by loading their extremities. The resulting actuated form derives from the elastic buckling of the rods subjected to inextensibility. We s ...

National Academy of Sciences2018

The mechanics of slender structures

Fabian Braun, Pedro Miguel Nunes Pereira de Almeida Reis

2018

Designing soft materials with interfacial instabilities in liquid films

Pierre-Thomas Paul Brun, Pedro Miguel Nunes Pereira de Almeida Reis

Natural soft materials harness hierarchy and structures at all scales to build function. Adapting this paradigm to our technological needs, from mechanical, phononic and photonic metamaterials to functional surfaces prompts the development of new fabricati ...

Nature Research2018

Active aerodynamic drag reduction on morphable cylinders

Pedro Miguel Nunes Pereira de Almeida Reis, Mark Andrew Guttag

We study a mechanism for active aerodynamic drag reduction on morphable grooved cylinders, whose topography can be modified pneumatically. Our design is inspired by the morphology of the Saguaro cactus (Carnegiea gigantea), which possesses an array of axia ...

2017

Fabrication of slender elastic shells by the coating of curved surfaces

Gioele Mariano Nicolò Balestra, François Gallaire, Pierre-Thomas Paul Brun, Pedro Miguel Nunes Pereira de Almeida Reis

Various manufacturing techniques exist to produce double-curvature shells, including injection, rotational and blow molding, as well as dip coating. However, these industrial processes are typically geared for mass production and are not directly applicabl ...

Nature Publishing Group2016

TLR4- and TRIF-dependent stimulation of B lymphocytes by peptide liposomes enables T cell-independent isotype switch in mice

Andrea Pfeifer, Marija Vukicevic, Valérie Gafner, Andreas Muhs, Anna Lucia Buccarello, Pedro Miguel Nunes Pereira de Almeida Reis

Immunoglobulin class switching from IgM to IgG in response to peptides is generally T cell-dependent and vaccination in T cell-deficient individuals is inefficient. We show that a vaccine consisting of a dense array of peptides on liposomes induced peptide ...

Amer Soc Hematology2013

Dynamic Nuclear Polarization NMR Spectroscopy: Revealing Multiple Conformations in Lipid-Anchored Peptide Vaccines

Andrea Pfeifer, Andreas Muhs, Pedro Miguel Nunes Pereira de Almeida Reis

Wiley-VCH Verlag GmbH2013

Oscillating fracture paths in thin elastic sheets: when geometry rules the fracture path

Pedro Miguel Nunes Pereira de Almeida Reis

We report a novel mode of quasi-static oscillatory crack propagation when a cutting tool is driven through a thin polymer film [6,7]. In our experiments, for tools with a large enough width, the crack tip follows a highly periodic path, leaving behind a st ...

2006

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