Publications by Pedro Miguel Nunes Pereira de Almeida Reis

A Numerical Study on the Buckling of Near-Perfect Spherical Shells

Pedro Miguel Nunes Pereira de Almeida Reis

We present the results from a numerical investigation using the finite element method to study the buckling strength of near-perfect spherical shells containing a single, localized, Gaussian-dimple defect whose profile is systematically varied toward the l ...

ASME International2025

The most severe imperfection governs the buckling strength of pressurized multi-defect hemispherical shells

Pedro Miguel Nunes Pereira de Almeida Reis, Fani Derveni, Dong Yan, Arefeh Abbasi

We perform a probabilistic investigation on the effect of systematically removing imperfections on the buckling behavior of pressurized thin, elastic, hemispherical shells containing a distribution of defects. We employ finite element simulations, which we ...

2025

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

Pedro Miguel Nunes Pereira de Almeida Reis

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 ...

IOP Publishing Ltd2025

Capsizing due to friction-induced twist in the failure of stopper knots

Pedro Miguel Nunes Pereira de Almeida Reis, Paul Johanns

We investigate the failure mechanism of stopper knots, with a particular focus on the figure -8 knot as a representative example. Stopper knots are widely used in climbing, sailing, racket stringing, and sewing to maintain tension in ropes, strings, or thr ...

Elsevier2024

Microfluidic device

Pedro Miguel Nunes Pereira de Almeida Reis

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 ...

2024

Stick-slip in a stack: How slip dissonance reveals aging

Pedro Miguel Nunes Pereira de Almeida Reis, Samuel Jean Bernard Poincloux

We perform physical and numerical experiments to study the stick -slip response of a stack of slabs in contact through dry frictional interfaces driven in quasistatic shear. The ratio between the drive's stiffness and the slab's shear stiffness controls th ...

Amer Physical Soc2024

Harnessing centrifugal and Euler forces for tunable buckling of a rotating elastica

Pedro Miguel Nunes Pereira de Almeida Reis, Michael Christopher Gomez

We investigate the geometrically nonlinear deformation and buckling of a slender elastic beam subject to time-dependent ‘fictitious’ (non-inertial) forces arising from unsteady rotation. Using a rotary apparatus that accurately imposes an angular accelerat ...

2024

Stretch-independent magnetization in incompressible isotropic hard magnetorheological elastomers

Pedro Miguel Nunes Pereira de Almeida Reis

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 ...

2024

Regulation ofthe swimming kinematics oflampreys Petromyzon marinusacross changes in viscosity

Pedro Miguel Nunes Pereira de Almeida Reis, Yuexia Luna Lin

The bodies of most swimming fishes are very flexible and deform as result of both external fluid dynamic forces and internal musculoskeletal forces. If fluid forces change, the body motion will also change unless the fish senses the change and alters its m ...

COMPANY BIOLOGISTS LTD2023

Fluid-structure interactions of bristled wings: the trade-off between weight and drag

Pedro Miguel Nunes Pereira de Almeida Reis, Matteo Pezzulla, Yuexia Luna Lin

The smallest flying insects often have bristled wings resembling feathers or combs. We combined experiments and three-dimensional numerical simulations to investigate the trade-off between wing weight and drag generation. In experiments of bristled strips, ...

Royal Soc2023