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Maria Letizia Raffa

Maria Letizia Raffa
ISAE-Supméca - Institut supérieur de mécanique de Paris

Ph.D.
Guest editor SI Recent Developments in Interfaces and Surfaces Engineering in Coatings (IF 2.881, ISSN 2079-6412)

About

32
Publications
4,544
Reads
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224
Citations
Introduction
Maria Letizia current research interests are imperfect interfaces, micromechanical homogenization and contact mechanics. Employed methods are based on analytical and numerical modeling strategy in continuum mechanics. Applications include but are not limited to composite materials, adhesive joints, rough contact mechanics.
Additional affiliations
September 2019 - August 2020
Supméca - Institut supérieur de mécanique de Paris
Position
  • Professor (Assistant)
November 2018 - August 2019
Aix-Marseille Université
Position
  • Research and teaching assistant (ATER)
October 2016 - September 2018
French National Centre for Scientific Research
Position
  • PostDoc Position
Education
January 2012 - November 2015
Aix-Marseille Université
Field of study
  • Solid Mechanics
September 2011 - November 2015
University of Rome Tor Vergata
Field of study
  • Structural Engineering
September 2008 - September 2011
Università degli Studi di Messina
Field of study
  • Structural Engineering

Publications

Publications (32)
Article
Full-text available
Adhesive interfaces are suitable modelling tools to describe very thin elastic layers and the related occurring phenomena (such as damage, viscosity, friction, etc.), without using a volumetric description, which is often computationally prohibitive in a large-scale numerical simulation. A major drawback of these kinds of models is the identificati...
Article
We report on an analytical model for damage description in adhesive butt joints. In themodel, the thin adhesive layer is replaced by a damaging bonding interface. The mechanical behaviorof the interface is described by a nonlinear and rate­dependent imperfect contact law. The law takesinto account both stress and displacement jumps, and it can desc...
Research Proposal
Interfaces/interphases play a crucial role in the global behaviour of materials and structures within many engineering fields. Suitable models are required to accurately take into account their multi-scale and multi-physic nature. The dual purpose of the present mini-symposium is to collect recent analytical and computational models of imperfect in...
Article
Bonding techniques are increasingly used in many industrial fields. Modelling the under-load damaging behavior of hard structural adhesives is still an open challenge. This work proposes a new hard interface analytical model with evolutive micro-cracking damage. The model is obtained within a rigorous theoretical framework combining asymptotic theo...
Preprint
Bonding techniques are increasingly used in many industrial fields. Modelling the under-load damaging behavior of hard structural adhesives is still an open challenge. This work proposes a new hard interface analytical model with evolutive micro-cracking damage. The model is obtained within a rigorous theoretical framework combining asymptotic theo...
Research Proposal
Full-text available
Madame, Monsieur, cher(e) collègue, Dans tous les secteurs industriels, les exigences de performance et de fiabilité, imposées aux composants et structures d’aujourd’hui, requièrent des solutions d’assemblages innovantes et adaptées. C’est pourquoi, comme suite au succès des trois premiers, ce 4ème colloque se propose de faire un point sur les as...
Article
Full-text available
The paper presents a new analytical model for thin structural adhesives in glued tube-to-tube butt joints. The aim of this work is to provide an interface condition that allows for a suitable replacement of the adhesive layer in numerical simulations. The proposed model is a nonlinear and rate-dependent imperfect interface law that is able to accur...
Article
Short and long‐term stabilities of cementless implants are strongly determined by the interfacial load transfer between implants and bone tissue. Stress‐shielding effects arise from shear stresses due to the difference of material properties between bone and the implant. It remains difficult to measure the stress field in periprosthetic bone tissue...
Article
Full-text available
In this paper a methodology to model a GFRP adhesive connections by using an imperfect soft interface model is presented. The model based on Kachanov’s theory considered a cracked thin adhesive. Within this framework, the mechanical properties and the initial damage (diffuse initial cracks) of the adhesive layer has been experimentally evaluated. W...
Preprint
Full-text available
Short and long-term stabilities of cementless implants are strongly determined by the interfacial load transfer between implants and bone tissue. Stress-shielding effects arise from shear stresses due to the difference of material properties between bone and the implant. It remains difficult to measure the stress field in periprosthetic bone tissue...
Article
Full-text available
Background. The surgical success of cementless implants is determined by the evolution of the biomechanical properties of the bone-implant interface (BII). One difficulty to model the biomechanical behavior of the BII comes from the implant surface roughness and to partial contact between bone and implant. The determination of the constitutive law...
Article
Biomechanical phenomena occurring at the bone-implant interface during the press-fit insertion of acetabular cup implants are still poorly understood. This article presents a nonlinear geometrical two-dimensional axisymmetric finite element model aiming at describing the biomechanical behavior of the acetabular cup implant as a function of the bone...
Article
Full-text available
The proposed study aims to derive an imperfect interface model which couples finite strain and damaging. The governing equations are obtained via an asymptotic approach within the finite strain theory. Theoretical findings have been numerically validated within an original application to brick/mortar interfaces in masonry walls in shear loading con...
Article
Full-text available
The present paper deals with a general asymptotic theory aimed at deriving some imperfect interface models starting from thin interphases. The novelty of this work consists in taking into account some non-standard constitutive behaviors for the interphase material. In particular, micro-cracks, surface roughness and geometrical nonlinearity are incl...
Article
Although the biomechanical behavior of the acetabular cup (AC) implant is determinant for the surgical success, it remains difficult to be assessed due to the multiscale and anisotropic nature of bone tissue. The aim of the present study was to investigate the influence of the anisotropic properties of peri-implant trabecular bone tissue on the bio...
Article
Full-text available
A new strategy for the numerical modelling of brick/mortar interfaces at the macro-scale taking into account finite strains and evolving microcracking phenomena is introduced. A numerical validation of the non-linear-imperfect interface model formulated in Part I of the present paper, is proposed. Well-established experimental data concerning diago...
Conference Paper
Full-text available
Biomechanical phenomena occurring at the bone-implant interface during and after the press-fit insertion of acetabular cup (AC) implants are poorly understood because of i) the complexity of bone tissue, ii) remodeling phenomena and iii) the presence of a rough interface. Two finite element (FE) models are proposed in this study. A 2D axisymmetric...
Article
Full-text available
In this paper, a nonlinear-imperfect interface model is proposed in order to model brick/mortar-interface behavior in small masonry assemblies. The proposed model, formulated according a micromechanical strategy, derives from a consolidated approach coupling arguments of asymptotic analysis and homogenisation method. The adopted asymptotic techniqu...
Chapter
Full-text available
Modeling interfaces between solids is of great importance in the fields of mechanical and civil engineering. Solid/solid interface behavior at the microscale has a strong influence on the strength of structures at the macroscale, such as gluing, optical systems, aircraft tires, pavement layers and masonry, for instance. In this lecture, a deductive...
Conference Paper
In this paper, a new imperfect interface model is presented. The model includes finite strains, micro-cracks and smooth roughness. The model is consistently derived by coupling a homogenization approach for micro-cracked media and arguments of asymptotic analysis. The model is applied to brick/mortar interfaces. Numerical results are presented.
Article
In this paper an interface model accounting for roughness and micro-cracks is presented and applied to masonry-like structures. The model is consistently derived by coupling a homogenization approach and arguments of asymptotic analyses. A numerical procedure is introduced and numerical results, based on a finite element formulation, are successful...
Conference Paper
Full-text available
The aim of this paper is to propose a new micro-mechanical model in the context of the deductive approach used to derive interface models. This model, based on a previous study introduced previously by A. Rekik and F. Lebon [31, 32], is used to reproduce the damage in masonry by combining structural analysis and homogenization methods. The focal po...

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Projects

Projects (6)
Project
The ASHENDO project is funded under the ANR JCJC (Young Researcher) scheme for a period of 48 months (2022-2026). The research area of the project is metal-composite structural bonding which, although it has obvious lightweighting advantages, is still not widely used due to a lack of knowledge about its in service conditions behaviour in particular under conditions of high humidity variations. The main objective of the project is to analyse and predict the initial damage and its evolution to the non-propagation threshold under the combined action of hygromechanical loadings. - WP1-Modelling and characterization at the microscale Task WP1a - Modelling the adhesive/substrates interfaces Task WP1b - Effective properties of the adhesive material (and substrates) - WP2-Modelling and characterization at the mesoscale - WP3-Meso/macro up-scaling and database Task WP3a – Database on hygromechanical properties of adhesive joints Task WP3b – Meso/macro up-scaling - WP4- Macroscale analysis and validation
Project
Dear Colleague, We would like to invite you to contribute to the Special Issue Recent developments in interfaces and surfaces engineering of the international peer-reviewed open access journal Coatings (IF 2.881, ISSN 2079-6412). Interfaces/interphases/surfaces play an essential role in determining the mechanical behavior, the structural integrity and the lifespan of a wide variety of materials and structures. The problems concerning interfaces and surfaces engineering (design, modeling, characterization, manufacturing, etc.) are often multi-scale and multi-physics (e.g. coupling of mechanical and environmental conditions). The fields concerned are countless, ranging from the transport industry, structures and infrastructures industries to the biomedical industry. This Special Issue is dedicated to recent advances in fundamental and applied research on solid material interfaces and surfaces. Contributions concerning theoretical, numerical and experimental aspects are welcome from scientists working in different fields of material science, mechanics of materials and structures. Topics to be covered include, but are not limited to, the following: -Multi-scale and multi-physics modeling of interphases, thin films and surfaces; -Tribology of rough contacting surfaces, surface treatments effects, coatings; -Models of imperfect, sliding, debonding or cohesive interfaces in composite materials; -Deformation, damage, fracture and other dissipative processes at interfaces; -Advanced finite element methods for interfaces and surfaces modeling; -Recent developments for interface and surface design; -Recent developments of adhesively bonding technology and materials. If you are interested in contributing, please send an email to maria-letizia.raffa@isae-supmeca.fr, so we can select Invited Papers. A very limited number of discount voucher are also available. Deadline for manuscript submissions: 20 December 2022. Best wishes, Maria Letizia Raffa Raffaella Rizzoni Frédéric C. Lebon Guest Editors