Pedro Miguel Nunes Pereira de Almeida Reis

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We investigate the mechanics of bistable, hard-magnetic, elastic beams, combining experiments, finite-element modelling (FEM) and a reduced-order theory. The beam is made of a hard magneto-rheological elastomer, comprising two segments with antiparallel ma ...

We develop a reduced model for hard-magnetic, thin, linear-elastic shells that can be actuated through an external magnetic field, with geometrically exact strain measures. Assuming a reduced kinematics based on the Kirchhoff-Love assumption, we derive a r ...

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 ...

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 ...

We study the bending of a booklike system, comprising a stack of elastic plates coupled through friction. The behavior of this layered system is rich and nontrivial, with a nonadditive enhancement of the apparent stiffness and a significant hysteretic resp ...

We perform a compare-and-contrast investigation between the equilibrium shapes of physical and ideal trefoil knots, both in closed and open configurations. Ideal knots are purely geometric abstractions for the tightest configuration tied in a perfectly fle ...

Biological membranes exhibit the ability to self-repair and dynamically change their shape while remaining impermeable. Yet, these defining features are difficult to reconcile with mechanical robustness. Here, we report on the spontaneous formation of a ca ...

A robust power device for wearable technologies and soft electronics must feature good encapsulation, high deformability, and reliable electrical outputs. Despite substantial progress in materials and architectures for two-dimensional (2D) planar power con ...

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 ...

The buckling of spherical shells is plagued by a strong sensitivity to imperfections. Traditionally, imperfect shells tend to be characterized empirically by the knockdown factor, the ratio between the measured buckling strength and the corresponding class ...

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 ...

Triaxial weaving, a craft technique that enables the generation of surfaces with tri-directional arrays of initially straight elastic strips, has long been loved by basket makers and artists seeking a combination of practical and aesthetically-pleasing str ...

This is a roadmap article with multiple contributors on different aspects of embodying intelligence and computing in the mechanical domain of functional materials and structures. Overall, an IOP roadmap article is a broad, multi-author review with leaders ...

Recent studies on magnetically hard, particle-filled magnetorheological elastomers (h-MREs) have revealed their stretch-independent magnetization response after full pre-magnetization. We discuss this phenomenon, focusing on incompressible, isotropic, part ...

Microfluidic device (1) comprising at least one conduit (9) arranged for the transport of a liquid, wherein said conduit (9) comprises at least one flexible element (11; 11a; 11b; 11c; 15; 15a; 15b) arranged to be reversibly movable between at least a firs ...

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 ...

We present a study on the pressure buckling of thin, elastic spherical shells containing a thickness defect. Methodologically, we combine precision model experiments, finite element simulations, and a reduced axisymmetric shell model. We observe qualitativ ...

The prediction of the critical buckling conditions of shell structures is plagued by imperfection sensitivity. Non-destructive testing through point-load probing has been recently proposed to map the stability landscape of cylindrical shells. However, the ...

Many aquatic animals propel themselves by flapping their tails. Leveraging a recently proposed snapping cantilever beam based on the concept of flexural tensegrity, we propose a bio-inspired propulsion device. The design comprises a segmental beam with hol ...

We investigate the effect of defect geometry in dictating the sensitivity of the critical buckling conditions of spherical shells under external pressure loading. Specifically, we perform a comparative study between shells containing dimpled (inward) versu ...

Pedro Miguel Nunes Pereira de Almeida Reis

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Snap buckling of bistable beams under combined mechanical and magnetic loading

A geometrically exact model for thin magneto-elastic shells

Finite Element Modeling of Tight Elastic Knots

Aeroelastic deformation of a perforated strip

Bending Response of a Book with Internal Friction

The shapes of physical trefoil knots

Spontaneous formation of a self-healing carbon nanoskin at the liquid-liquid interface

3D stretchable and self-encapsulated multimaterial triboelectric fibers

Rigidity of hemispherical elastic gridshells under point load indentation

Probabilistic buckling of imperfect hemispherical shells containing a distribution of defects

Form finding in elastic gridshells

How to weave a perfect sphere with curved strips

Roadmap on Embodying Mechano-intelligence and Computing in Functional Materials and Structures

Stretch-independent magnetization in incompressible isotropic hard magnetorheological elastomers

Microfluidic device

Active aerodynamic drag reduction on morphable cylinders

Buckling of pressurized spherical shells containing a through-thickness defect

Probing the buckling of pressurized spherical shells

Flexural-tensegrity snapping tails for bio-inspired propulsion in fluids

Comparing the Buckling Strength of Spherical Shells With Dimpled Versus Bumpy Defects