Fabrizio Scarpa

Fabrizio Scarpa
University of Bristol | UB · Department of Aerospace Engineering

Laurea in Ingegneria Aeronautica
Currently working on fossil and biobased metamaterials at the interface between mechanics and synthetic biology.

About

581
Publications
153,664
Reads
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15,417
Citations
Introduction
My research activities are related to auxetic metamaterials and structures, smart and nanomaterials, composites, natural fibres, vibroacoustics, morphing and adaptive structures. I develop designs, models, prototypes and perform mechanical and multidomain characterisation. I have several projects at the moment looking at natural fibres and related composites, nanomaterials and bridging synthetic biology to structural load-bearing materials.
Additional affiliations
April 2015 - August 2015
Zhejiang University
Position
  • Professor
June 2013 - September 2013
Georgia Institute of Technology
Position
  • Researcher
July 2005 - present
University of Bristol
Position
  • Professor (Full)
Description
  • Auxetics, nanostructures, smart materials, morphing systems, biocomposites
Education
October 1993 - July 1997
Politecnico di Torino
Field of study
  • Machine Design
October 1987 - July 1993
Politecnico di Torino
Field of study
  • Aeronautical Engineering

Publications

Publications (581)
Article
A scalable mechanical metamaterial simultaneously displaying negative stiffness and negative Poisson's ratio responses is presented. Interlocking hexagonal subunit assemblies containing 3 alternative embedded negative stiffness (NS) element types display Poisson's ratio values of -1 and NS values over two orders of magnitude (-1.4 N mm(-1) to -160...
Article
We present a lattice structure defined by patterns of slits that follow a rotational symmetry (chiral) configuration. The chiral pattern of the slits creates a series of hinges that produce deformation mechanisms for the lattice due to bending of the ribs, leading to a marginal negative Poisson's ratio. The engineering constants are modelled using...
Article
The proverbial "nine lives" of cats are attributed to the capacity of the felines to withstand jumps and falls from a high-rise without being fatally wounded, and this is due in large part to their impact-resistant paw pads. The pads possess a complex architecture of multiscale collagen fiber networks and adipose mass chambers. We propose in this p...
Article
We describe here a class of acoustic metamaterials with fractal Hilbert space-filling and coiled geometry with equal tortuosity for noise mitigation. Experiments are performed using a four-microphone impedance tube and bench-marked against non-viscous and viscothermal Finite Element models related to configurations spanning up to five fractal/geome...
Article
Humidity responsive materials are increasingly attracting significant interest for soft robotics and deployable structures. Their shape-changing behavior is based on differential hygroscopic characteristics of the single components of their microscopic architecture. Although existing moisture-induced materials achieve morphing in various humidity c...
Article
Current interest towards ionic liquids (ILs) stems from some of their novel characteristics, like low vapour pressure, thermal stability and non-flammability, integrated through high ionic conductivity and broad range of electrochemical strength. Nowadays, ionic liquids represent a new category of chemical-based compounds for developing superior an...
Article
This data article presents four experiment results related to flax fibre composites with epoxy shape memory polymer matrix: water vapor absorption, mass diffusion immersed in water, hygroscopic expansion, mechanical properties. The water vapor absorption tests are described by raw data related to four types of laminates with weights measured at dif...
Article
This work proposes a new dynamic poroelastic model to describe the vibration transmissibility of auxetic polyurethane (PU) foams. The model includes the pneumatic damping effect provided by the porous structure of the foam, and the viscoelasticity of the PU material. The auxetic foam is manufactured using a simplified and relatively low-cost uniaxi...
Article
Full-text available
In this work, we evaluate the mechanical performance of an innovative asymmetrical re-entrant metamaterial configuration via finite element (FEM) models. The cell topologies described here consist of asymmetric re-entrant and anti-tetrachiral configurations described by equi-dimensional representative unit cells (RUCs). The asymmetric geometry prov...
Article
This work describes the impact behaviour of a hybrid fibre-particulate composite composed of glass-carbon fibres and easily dispersible microparticles. The effects of fibre stacking sequence (carbon-C5, glass-G5, C2G3, G3C2, GCGCG and CG3C), particle type (silica, cement and carbon microfibers-CMF) and matrix-fibre volume fraction (40/60 and 60/40)...
Article
Auxetic (negative Poisson's ratio) open cell polymeric foams have been traditionally produced using thermoforming techniques coupled with the volumetric compression of conventional (pristine) off-the-shelf foams. The anisotropy of the pristine foam plays however a strong role on the performance of thermoformed auxetic foams, and this is the subject...
Article
This work describes the high-velocity impact behavior of doubly curved sandwich panels. The sandwich panels are manufactured using carbon/fiber epoxy composite face sheets, polyurethane foam core and 3D-printed PLA plastic cellular auxetic (re-entrant) honeycombs. High-velocity impact tests are carried out by using a single-stage air gas gun test m...
Article
Full-text available
This paper aims to optimize vibro-acoustic response of (non-) auxetic sandwich panels by use of topology optimization method. First, structural noise and vibration responses of the auxetic panel with the re-entrant hexagonal honeycomb core are studied. It is proved that the interactions between the structural vibrations and induced noise are more c...
Article
Sandwich structures for engineering load-bearing applications are commonly characterised using three-point (3P) bending tests. Classical beam theory shows that the ratio between the flexural stiffness and moment of inertia of the cross-section (flexural modulus) in rectangular sandwich panels is independent of the support span length and width. Pra...
Article
Full-text available
Fibre metal laminates (FMLs) are lightweight structures with high structural performance and are suitable for many industrial applications. This work describes the impact behaviour of novel sisal fibre-reinforced aluminium laminates (SiRAL) and their dependence upon the orientations of the fibres, the composite core used and the surface treatment o...
Article
The damping properties of carbon fiber reinforced polymer (CFRP) composites play a critical role in many engineering fields. The purpose of this paper is to investigate how the damping properties of CFRP composites can be improved by interfacial sliding of two-dimensional multilayer graphene oxide (GO). In this work, we show how the energy dissipat...
Article
Full-text available
Auxetic foams counter-intuitively expand (shrink) under stretching (compression). These foams can exhibit superior mechanical properties such as resistance to shear and indentation, improved toughness and energy absorption (EA) under several types of loadings. Their unique deformation mechanism and manufacturing process lead to special multiphysics...
Article
Full factorial designs are conducted to identify the effects of the incorporation of microparticles of silica, Portland cement and carbon laminate wastes (carbon microfibres - CMF), at 3, 6 and 9 wt% levels, on the mechanical performance of epoxy polymers and single carbon fibre joints at two grammage levels (200 and 600 g/m2). Particulate reinforc...
Article
This work describes large strain quasi-static and impact tests of a new class of low-cost, uniaxially thermoformed, transverse isotropic auxetic foams with compression ratio ranging from 20% to 80%. A custom drop tower rig with high-speed cameras suitable for these soft porous foam materials is designed and used to perform impact tests with energy...
Article
The paper describes the influence provided by the humidity on the mechanical and failure properties of 3D printed composites made by continuous flax fibres reinforcing a poly-lactic acid matrix. The bulk in-plane shear, transverse and longitudinal samples considered here have 28-31% fibre volume fraction and 3-6% porosity. The longitudinal and tran...
Article
The development of sustainable sandwich materials is needed in the transportation sector to address environmental concerns related to the production and operation of vehicles. In addition to biobased composite skins, alternatives to classic synthetic core materials must be found to reduce the ecological footprint of whole sandwich-structured compos...
Preprint
Full-text available
We describe here a class of acoustic metamaterials with fractal Hilbert space-filling and coiled geometry with equal tortuosity for noise mitigation. Experiments are performed using a four-microphone impedance tube and benchmarked against non-viscous and viscothermal Finite Element models related to configurations spanning up to five fractal/geomet...
Article
Many large-scale tensegrity structures are formed by assembling repeating units; a tensegrity tower formed by stacking tensegrity prisms is one example. Tessellated tensegrity structures tend to feature a repeating topology, but the geometry and self-stress vary across the assembly. In this work we design tensegrity structures by imposing periodic...
Article
Full-text available
The extensive disposal of plastic components into the environment requires an economically and ecologically feasible solution for the proper treatment or new uses for plastic waste. This study compares the environmental and mechanical performance of a sandwich panel based on disposed bottle caps core with different eco-friendly skins and adhesive....
Article
Two-dimensional metamaterials with patterns of perforations producing auxetic effects can exhibit variable and tailorable deformation mechanisms by varying the distributions of cells with different geometry parameters. The local homogenized Poisson’s ratio can be used as a way to establish as a link between local unit cell parameters and global def...
Article
Removal of hazardous herbicides from the aqueous solution is critical for overcoming health-related issues across the wider population. In the current work, we have prepared sodium alginate (SAlg), dextrin, and acrylic acid (AA) based cross-linked hydrogels, composed of bentonite incorporated in the biocompatible hydrogel matrix. This hydrogel comp...
Article
Full-text available
This work investigates a novel concept of sandwich panel composed of discarded polypropylene (PP) bottle caps as circular honeycomb core and skins made with a hybrid glass fibre/silica composite. A full factorial design (DoE) is carried out to identify the effects of the core packing system and the inclusion of silica particles in the composite ski...
Article
Full-text available
We present here a simplified procedure to manufacture auxetic PU foam via a single direction thermoforming compression process applied to conventional (pristine) open cell foam samples. The auxetic foams produced here have a Poisson's ratio !" ranging from-1 to 0 in the 1-2 plane and a tangent modulus Et2 ranging from 0.2MPa to 2MPa. X-ray μ-CT and...
Article
As part of local agricultural date palm waste valorization, this work describes bio-composites made with a cement matrix reinforced with short Mesh date palm fibers for non-structural civil engineering applications. The study focuses in particular on investigating the influence of four parameters on the bending and compression properties of the bio...
Conference Paper
Open cell polymer foams are of great interest in several applications due to their flammability resistance, lightweight properties, dissipation and absorption of energy and acoustical insulation. The control of their mechanical properties by applying nanosized coating layers of composite material with nanotubes has been also evaluated. The mechanic...
Article
Penta-graphene (PG) is a new theoretical two-dimensional metastable carbon allotrope composed entirely of carbon pentagons. In this paper, molecular dynamics simulations are performed to investigate the effects of the hydrogenation on the tensile and shear mechanical properties, together with the failure mechanism of PG with vacancy defects. The re...
Article
A composite bi-stable structure can deform and maintain its stable states without the need for constant energy inputs. In this paper we describe a class of composite bi-stable shells that makes use of ad-hoc stacking sequences and pre-bending to modify the curvature of the plate. These composite structures possess two types of bi-stability (same di...
Article
This paper investigates the mechanisms that can be used to enhance the absorption performance of poro-elastic materials in the viscous regime. It is shown that by adding small inclusions in a poro-elastic foam layer, a mass-spring effect can be introduced. If the poro-elastic material has relatively high viscous losses in the frequency range of int...
Article
Lattice metamaterials exhibit remarkable mechanical properties and novel functionalities, such as high specific stiffness, fracture toughness, tunable vibroacoustic properties, and energy absorption. This study explores a group of lattice metamaterials with fractal cuts that feature energy dissipation via structural sliding friction mechanisms and...
Article
A low-velocity impact characterisation of a sustainable sandwich panel based on upcycled bottle caps as circular honeycomb is conducted. The recycled core aims to develop an alternative route of reusing waste bottle caps disposed in landfills. Ecological alternatives to skin (recycled PET foil) and adhesive (bio-polyurethane) are also compared with...
Article
Lignocellulosic fibers from date palm are one of the most available biomasses without significant valorization in the world. This work makes use of an experimental Taguchi design with three factors to determine the optimal conditions of three parameters related to date palm leaflets (gauge length, loading speed and fiber position). The paper also s...
Article
This work describes the experimental and numerical behaviour of sandwich panels made of aluminium skins and bamboo core under low-velocity impact test. A statistical design is carried out to evaluate the effect of the bamboo diameter (Ø20 and Ø30 mm) and the adhesive type (epoxy and biopolymer) on the maximum load, energy to maximum load, total def...
Article
We propose in this work an innovative hybrid auxetic metamaterial with a centersymmetric unit cell and tessellation topology similar to the one provided by the missing rib configuration. The tessellation proposed is applied to different core unit cells (star shape, cross-chiral shape with same dimensions, and reentrant). The effects of the geometri...
Article
The work describes the out-of-plane properties of a curved wall honeycomb structure evaluated using analytical models and finite elements techniques. Out-of-plane properties are calculated using a theoretical approach based on energy theorems and validated using a full-scale finite element technique to simulate transverse shear tests. The effects o...
Presentation
Full-text available
In order to achieve truly reconfigurable origami structures, we propose a distributed network of embedded actuators to achieve the desired shape-adaptation. Even for rigid-foldable patterns, the effect of an individual actuator will be localised due to the elastic deformations of the facets. This leads to the question of how to best distribute such...
Article
This work describes the low-velocity impact behavior of composite sandwich panels with different types of auxetic (negative Poisson's ratio) and non-auxetic prismatic core structures. Sandwich panels have been manufactured with carbon/fiber epoxy composite face sheets, polyurethane rigid foam core or 3D printed PLA plastic cellular honeycombs head...
Article
Penta-graphene is a new two-dimensional metastable carbon allotrope composed entirely of carbon pentagons with unique electronic and mechanical properties. In this work we evaluate the mechanical performance of new classes of defective penta-graphene subjected to tensile and shear loading by using molecular dynamics simulations. The types of defect...
Article
Full-text available
sustainable antimicrobial encapsulation and coatings for targeted treatment and infections prevention: Preparation for Another Pandemic, Current Research in Green and Sustainable Chemistry, https://doi. Abstract 26 There has been a growing concern for safety and precautions in the wake of coronavirus SARS-27 CoV2 pandemic also dubbed as COVID-19, w...
Article
Full-text available
The use of recycled and renewable components in structural applications supports the development of sustainable lightweight structures. Disposed bottle caps can be used to generate eco-friendly honeycomb cores, especially when combined with other eco-friendly components. A natural fibre-based laminate represents an alternative to synthetic fibres,...
Article
Morphing wingtip technology could improve the reduction of the induced drag, fuel consumption, and take-off and landing distances in fixed wing configurations. We describe in this work a morphing winglet concept based on active inflatable honeycombs and Shape Memory Polymer Composite (SMPC) skins. The combination of the two materials and structural...
Article
Full-text available
Origami-inspired approaches to deployable or morphing structures have received significant interest in a range of fields. For such applications the shape of the origami must be actively controlled. We propose a distributed network of embedded actuators which open/close individual folds, and present a methodology for selecting the positions of these...
Article
Full-text available
We compare computational methods for determining the force between carbon atoms as a function of bond length, in order to establish which ones are capable of accurately simulating carbon-carbon bonds breaking due to applied mechanical strain in nanomaterials. Results from Tight-binding, density-functional theory and molecular mechanics potentials a...
Article
This paper focuses on identifying parameters for optimized distributions of local internal resonators to enhance the vibro-acoustic performance of anti-tetra-chiral auxetic sandwich panels. The sandwich panel and its auxetic core are simulated using a full-scale finite element approach. An equivalent homogenized model is then employed to reduce the...
Chapter
This paper concerns an experimental approach to the stacking sequence influence on cross-ply laminates behaviour. Effects of fatigue on the residual strength and stiffness are investigated through performing post fatigue static test after specific numbers of cycles. Residual strengths were measured by testing specimens to a certain number of cycles...
Article
Full-text available
Abstract This work investigates the mechanical behaviour of a sustainable sandwich panel, consisting of bamboo rings core, treated aluminium skins and epoxy adhesive. A Design of Experiment (DoE) is used to identify the effects of bamboo diameters (30 and 45 mm) and aluminium skin treatments (alkaline degreasing and application of primer) on the me...
Article
The Bouligand structure is a typical helicoidal architecture found in various crustaceans in which each layer rotates by a small angle relative to the adjacent one. We present a theoretical analysis to relate the rotation pitch angle to the mechanical performance (interlaminar shear property in this case) of laminas mimicking the Bouligand architec...
Article
Full-text available
The extent to which biologic payloads can be effectively delivered to cells is a limiting factor in the development of new therapies. Limitations arise from the lack of pharmacokinetic stability of biologics in vivo. Encapsulating biologics in a protective delivery vector has the potential to improve delivery profile and enhance performance. Coacer...
Article
We describe here the quasi-static crushing behavior of novel classes of multiphase (hybrid) hierarchical lattice metamaterials. The first class is represented by a hybrid architecture combining a hierarchical honeycomb with polyurethane foam filler, while the second is a multiphase structure produced by injecting an alginate hydrogel into the hiera...
Article
This work describes the in-plane uniaxial tensile mechanical properties of two-dimensional graded rectangular perforations metamaterials using numerical homogenization finite element approaches benchmarked by experimental results. The metamaterial configuration is based on graded patterns of centre-symmetric perforated cells that can exhibit an aux...
Article
Full-text available
A sandwich structure made of sustainable components is investigated under quasi-static and dynamic conditions. The upcycled plastic bottle caps are used to manufacture a greener circular cell honeycomb core, based on a full factorial design. A recycled PET foil is used as skins, being compared to a classic panel with aluminium skins. The particle-r...
Chapter
This investigation concerns the development of two prediction fatigue life models of cross-ply laminates, made up of glass fibre and epoxy resin, loaded under flexural control load. Both models are based on the description of the load’s evolution versus the cycle number during fatigue tests by several empirical functions of logarithmic, exponential...
Article
The paper describes an optimised strategy to measure the porosity in natural fibre composites. Particular emphasis is placed on thermoformed flax fibres reinforced poly-lactic acid (FFRPLA) laminates. Six different methods to measure the porosity were evaluated and compared: gravito-metry in ethanol and in water, scanning electron microscopy (SEM),...
Chapter
Algeria is the largest country in Africa by in terms of land area, which makes it contain large quantities of agricultural residues. The aim of this study is the valorisation of the huge amount of agricultural residue of date palm rachis available in Algeria to be used as reinforcement in bio-composite materials for various industrial applications....
Article
We present in this paper two novel concepts of hybrid metamaterials that combine a core unit cell of re-entrant or cross-chiral shape and lateral missing ribs. The first topology is a hybrid between an anti-tetrachiral and a missing rib (cross-chiral) configuration; the second one has a variable cross-chiral layout compared to the classical missing...
Article
Full-text available
This work describes the bending and shear mechanical properties of a novel concept of sustainable sandwich panel made from unidirectional prepreg flaxtape skins and bamboo rings as a circular core material. A Design of Experiment (DoE) is used to determine the influence of the bamboo diameter and the type of adhesive bonding between core and skins...
Article
This work aims to optimize the physico-chemical and tensile properties of vascular fibers extracted from a local date palm rachis in Algeria. This fiber has a very specific composition and architecture and is different from the remaining fibers obtained from the six possible parts of the tree. For this purpose, a Taguchi orthogonal array design L16...
Article
This work describes the use of transverse reinforcement in eco-friendly sandwich panels made from aluminium skins and a core of upcycled bottle caps. The Design of Experiments technique identifies the effect of the position of the metal rivets on the panel. The results show a moderate increase in strength and a significant enhancement of the sandwi...