According to aircraft manufacturers and several air transportation players, the main challenge civil aviation will have deal with in future is provide a sustainable growth strategy, order face growing demand of traffic all over world. The sustainability requirements are related pollution, noise impact, airport congestion, competitiveness systems terms travel time passengers' comfort. Among possible ways allow systems, disruptive configurations been object study for years, demonstrate that...

The paper aims to present the design phases of a 300 ca. passengers box-wing aircraft, called PrandtlPlane, proposed as an efficient alternative for future air transport. presents workflow carried out during project, starting from definition Top Level Aircraft Requirements up preliminary conservative and improvable baseline configuration , which has been object high-fidelity assessment in order compare its performance with 200 passenger reference conventional aircraft same category...

The control of the shape complex metasurfaces is a challenging task often addressed in literature. This work presents class tessellated plates able to deform into surfaces preprogrammed upon activation by any flexural load and that can be controlled single actuator. Quadric are obtained from infinitesimal origami maps monohedral hexagonal tessellations plane, pavings which all tiles congruent each other. Monohedral portions joined together obtain more shapes, locally synclastic or...

1. Fischer A., 1995. Bending instabilities of thin-walled transversely curved metallic strips, Report cued/d-struct/tr 154. Google Scholar

This paper explores the modeling of incipient cutting by Abaqus, LS-Dyna, and Ansys Finite Element Methods (FEMs), comparing also experimentally results on different material classes, including common aluminum steel alloys an acetal polymer. The target application is sustainable manufacturing gecko adhesives micromachining a durable mold for injection molding. challenges posed shape include undercuts sharp tips, which can be machined special diamond blade, enters material, forms chip, exits....

In Part I of this study, it was shown that all the three known types monohedral hexagonal tessellations plane, those composed equal irregular hexagons, have just a single deformation mode when tiles are considered as rigid bodies hinged to each other along edges. A gallery tessellated plates simulated numerically demonstrate range achievable deformed shapes. II, displacement field first derived and continuous interpolant for type plate. It turns out corresponding metasurfaces described by...

Abstract In this paper, we study the $$\Gamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Γ</mml:mi> </mml:math> -limit of a properly rescaled family energies, defined on narrow strip, as width strip tends to zero. The limit energy is one-dimensional and able capture (and penalize) concentrations midline curvature. At best our knowledge, it first paper in -convergence field for dimension reduction that predicts elastic hinges. particular, starting from purely shell...

Abstract We show we can derive the so called polar representation of 2D symmetric second and fourth order real tensors essentially just relying on spectral theorem for unitary in complex field. The use a coordinate-free approach allows us to clearly methodically detect rotation-invariant quantities readily (and directly) deduce theorems.

Abstract In a famous report about the induced drag of multiplanes, L. Prandtl conceived Best Wing System: lifting system having minimum among all other ones, for assigned wingspan and lift. The resulting shape was box-wing, asymptotically equivalent to multiplane infinite wings. At end report, he gave performance this optimal (in terms dimensionless vertical gap) through curve, without presenting method used. Nowadays, modern computational aerodynamics show an excellent agreement between...

The activities reported in this paper are part of the project “PARSIFAL” (Prandtlplane ARchitecture for Sustainable Improvement Future AirpLanes), funded by European Community under Horizon 2020 program and coordinated University Pisa (Italy); other partners are: Delft Technology (The Netherlands), ONERA (France), Arts et Métiers ParisTech-ENSAM DLR (Germany) SkyBox Engineering (Italy). presents a summary preliminary design activities, carried out with PARSIFAL order to study introduction...

Abstract We consider a family of three-dimensional stiffened plates whose dimensions are scaled through different powers small parameter $\varepsilon $ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>ε</mml:mi> </mml:math> . The plate and the stiffener assumed to be linearly elastic, isotropic, homogeneous. By means $\Gamma <mml:mi>Γ</mml:mi> -convergence, we study asymptotic behavior problems as tends zero. For relative values , show how interplay between affects limit...

A typical feature of living tissues is proliferation by division: it a fundamental aspect many biological processes, including embryonic development, morphogenesis, and cancer growth. Here, we study the energetics cell division occurring in epithelia, highlighting interplay key parameters ruling mitosis. We find existence region, parameter space, which independent elasticity weakly dependent on ratio between mother daughter cells areas. In this energetically favorable. Our results may lead...