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Joël Cugnoni

Cette personne a quitté l’EPFL

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Publications associées (80)

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Factors affecting subject-specific finite element models of implant-fitted rat bone specimens: critical analysis of a technical protocol

John Botsis, Joël Cugnoni, Marco Piccinini

The authors propose a protocol to derive finite element (FE) models from micro computer tomography scans of implanted rat bone. A semi-automatic procedure allows segmenting the images using specimen-specific bone mineral density (BMD) thresholds. An open-s ...

Taylor & Francis2014

An efficient method for fiber bridging traction identification based on the R-curve: Formulation and experimental validation

John Botsis, Joël Cugnoni, Thomas Gmür, Guillaume Frossard

Fiber bridging is one of the main toughening mechanisms in mode I interlaminar and intralaminar fracture of laminated composites. Intact fibers exert closing forces on both faces of the crack, restraining crack propagation. An effective identification proc ...

Elsevier2017

Bone reactions to controlled loading of endosseous implants: a pilot study

John Botsis, Joël Cugnoni

Objectives: To validate an experimental setup designed to apply load onto bone tissue using osseointegrated implants in a rabbit model. Specifically, (1) to design an apparatus capable of generating controlled forces, (2) to assess implant placement, maint ...

Wiley-Blackwell2008

External Mechanical Microstimuli Modulate the Osseointegration of Titanium Implants in Rat Tibiae

John Botsis, Joël Cugnoni

Purpose. To assess the effect of external mechanical microstimuli of controlled magnitude on the microarchitecture of the peri-implant bone beds in rat tibiae. Materials and Methods. Tibiae of forty rats were fitted with two transcutaneous titanium cylinde ...

Hindawi Publishing Corporation2013

Mixed mode fracture behavior of welded wood joints investigated with the Arcan test

John Botsis, Joël Cugnoni, Parviz Navi, Martin Rhême

Friction welding of wood is an assembly method that is still under investigation and development. A possible application for welded wood joints is the fabrication of multi-layered panels (i.e., cross-laminated panels). In an effort to model the behavior of ...

Springer Verlag2016

Mode I interlaminar fracture of carbon epoxy laminates: Effects of ply thickness

John Botsis, Joël Cugnoni, Thomas Gmür, Guillaume Frossard

In this work, the influence of ply thickness on strain energy release rate (ERR) in delamination of carbon epoxy laminates is addressed. Specimens with three ply thicknesses: 0.030, 0.075 and 0.150 mm are tested. While the ERR at onset of crack propagation ...

Elsevier2016

Numerical And Statistical Estimates Of The Representative Volume Element Of Elastoplastic Random Composites

John Botsis, Joël Cugnoni, Matteo Galli

In many applications elastoplastic composites are used in limited amounts, therefore it is important to have estimates of the size of their representative volume element both for modeling and experimental purposes. In this work the tensile response of part ...

Elsevier2012

High-speed internal strain measurements in composite structures under dynamic load using embedded FBG sensors

John Botsis, Thomas Gmür, Joël Cugnoni, Jeannot Frieden, Dragan Coric

Internal strain measurements in cross-ply carbon-epoxy composite plates under dynamic loads are carried out using embedded FBG sensors. The principle of the FBG interrogation is based on intensity demodulation achieved via a Fabry-Perot filter. To account ...

2010

Transverse cracking in the bulk and at the free edge of thin-ply composites: experiments and multiscale modelling

John Botsis, Robin Amacher, Joël Cugnoni, Sébastien Kohler

Thin-ply composites were shown to exhibit significantly delayed transverse cracking, but the linear onset of damage scaling with ply thickness reported by Amacher et al. (2014) did not correspond to the established LEFM based in situ strength model. This s ...

2019

Specimen thickness dependence of large scale fiber bridging in mode I interlaminar fracture of carbon epoxy composite

John Botsis, Joël Cugnoni, Ebrahim Farmand Ashtiani

Large scale bridging is an important toughening mechanism in composite laminates that depends on the specimen geometry as well as the constituent materials. In this work, an iterative approach is applied to identify the effect of specimen thickness on trac ...

Elsevier2015

Survivability of integrated PVDF film sensors to accelerated ageing conditions in aeronautical/aerospace structures

Joël Cugnoni, Alain Schorderet, Enrique René Guzman Solares

This work validates the use of integrated polyvinylidene fluoride (PVDF) film sensors for dynamic testing, even after being subjected to UV-thermo-hygro-mechanical accelerated ageing conditions. The verification of PVDF sensors' survivability in these envi ...

Institute of Physics2013

Multi-material rail pad and method for manufacturing same

Maurice Ammann, Véronique Michaud, John Christopher Plummer, Joël Cugnoni, Holger Frauenrath, Oguzhan Oguz, Adrien Julien Demongeot

The invention relates to a rail pad (10, lOa-v, 10α-η) comprising: a) a pad matrix (1) comprising a first material and b) at least one damping element (2) at least partially encapsulated or embedded in the pad matrix (1), said damping element (2) comprisin ...

2022

Implementation of the "loaded implant" model in the rat using a miniaturized setup - description of the method and first results

John Botsis, Joël Cugnoni

Objective To miniaturize the loaded implant model to permit its application to small rodents. In this model, two titanium implants are placed 8 mm apart with their heads protruding from the skin and are forced together by a dedicated actuator. To assess th ...

Wiley-Blackwell2012

Improved dynamic characterization of the elastic properties in composite plates

Thomas Gmür, Joël Cugnoni, Alain Schorderet, Marco Matter

2005

The role of the fluid phase in the viscous response of bovine periodontal ligament

John Botsis, Joël Cugnoni, Marzio Bergomi

The mechanical response of the periodontal ligament (PDL) is complex. This tissue responds as a hyperelastic solid when pulled in tension while demonstrating a viscous behavior under compression. This intricacy is reflected in the tissue's morphology, whic ...

2010

Joël Cugnoni

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Factors affecting subject-specific finite element models of implant-fitted rat bone specimens: critical analysis of a technical protocol

An efficient method for fiber bridging traction identification based on the R-curve: Formulation and experimental validation

Bone reactions to controlled loading of endosseous implants: a pilot study

External Mechanical Microstimuli Modulate the Osseointegration of Titanium Implants in Rat Tibiae

Mixed mode fracture behavior of welded wood joints investigated with the Arcan test

Mode I interlaminar fracture of carbon epoxy laminates: Effects of ply thickness

Numerical And Statistical Estimates Of The Representative Volume Element Of Elastoplastic Random Composites

High-speed internal strain measurements in composite structures under dynamic load using embedded FBG sensors

Transverse cracking in the bulk and at the free edge of thin-ply composites: experiments and multiscale modelling

Specimen thickness dependence of large scale fiber bridging in mode I interlaminar fracture of carbon epoxy composite

Survivability of integrated PVDF film sensors to accelerated ageing conditions in aeronautical/aerospace structures

Multi-material rail pad and method for manufacturing same

Implementation of the "loaded implant" model in the rat using a miniaturized setup - description of the method and first results

Improved dynamic characterization of the elastic properties in composite plates

The role of the fluid phase in the viscous response of bovine periodontal ligament

Quantification of damage due to environmental conditions on carbon fibre/epoxy composite samples

Modal validation of sandwich shell finite elements based upon a p-order shear deformation theory including zigzag terms

Influence of the thin ply size on mode I and II energy release rate of unidirectional carbon epoxy laminates

Improved modal characterization of the constitutive parameters in multilayered plates

Numerical-experimental identification of the elastic and dissipative properties in composite sandwich plates