Publications de Joël Cugnoni | EPFL Graph Search

Translaminar fracture in (non–)hybrid thin-ply fibre-reinforced composites: An in-depth examination through a novel mini-compact tension specimen compatible with microscale 4D computed tomography

Joël Cugnoni, Véronique Michaud, Guillaume Clément Broggi, Alexios Argyropoulos

Translaminar fracture toughness is pivotal for notch sensitivity and damage tolerance of fibre-reinforced composites. Hybridisation offers a promising pathway for enhancing this parameter in thin-ply composites. Three novel mini-compact tension specimen ge ...

2025

Multi-material rail pad and method for manufacturing same

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

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

A functional approach towards the design, development, and test of an affordable dynamic prosthetic foot

Joël Cugnoni, Klaus Benedikt Schönenberger, Kamiar Aminian, John Botsis, Véronique Michaud, Mathieu Pascal Falbriard, Rajasundar Chandran

Humanitarian actors involved in physical rehabilitation, such as the International Committee of the Red Cross (ICRC), usually provide their beneficiaries with lower-limb prostheses comprising Solid Ankle Cushion Heel (SACH) feet as these are considered app ...

PUBLIC LIBRARY SCIENCE2022

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

Joël Cugnoni, John Botsis, Robin Amacher, 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

Analysis and evaluation of friction effects on mode II delamination testing

Joël Cugnoni, John Botsis, Marco Borotto, Lorenzo Mencattelli

2018

Ply thickness dependence of the intralaminar fracture in thin-ply carbon- epoxy laminates

Joël Cugnoni, Thomas Gmür, John Botsis, Guillaume Frossard

2018

Towards aerospace grade thin-ply composites: Effect of ply thickness, fibre, matrix and interlayer toughening on strength and damage tolerance

Joël Cugnoni, John Botsis, Robin Amacher, Larissa Sorensen, Sébastien Kohler

Thin-ply composites represent a promising approach to further improve the performance of carbon fibre composite structures thanks to their ability to delay the onset of matrix cracking and delamination up to the point of fibre dominated failure. However, t ...

ELSEVIER SCI LTD2018

Deformation behavior of nano-porous polycrystalline silver. Part II: Simulations

Joël Cugnoni, Helena Van Swygenhoven, Steven Van Petegem

Three-dimensional finite element simulations of nano-porous silver structures are performed to understand the correlation between the porous morphology and the mechanical behavior. The nano structures have been obtained from ptychographic X-ray computed to ...

Elsevier2017

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

Joël Cugnoni, Thomas Gmür, John Botsis, 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

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

Joël Cugnoni, Thomas Gmür, John Botsis, 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

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

Joël Cugnoni, Parviz Navi, John Botsis, 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

Peri-implant bone adaptations to overloading in rat tibiae: experimental investigations and numerical predictions

Joël Cugnoni, John Botsis, Marco Piccinini

Objectives(i) To assess the effects of mechanical overloading on implant integration in rat tibiae, and (ii) to numerically predict peri-implant bone adaptation. Materials and methodsTranscutaneous titanium implants were simultaneously placed into both tib ...

Wiley-Blackwell2016

Effects of large scale bridging in load controlled fatigue delamination of unidirectional carbon-epoxy specimens

Joël Cugnoni, John Botsis, Ebrahim Farmand Ashtiani

Fatigue delamination growth in composites is accompanied by large scale bridging (LSB) that yields important toughening effects. However, the extent of this mechanism depends on the laminate geometry rendering its modeling a challenging task. This work pre ...

Elsevier2016

Numerical prediction of peri-implant bone adaptation: Comparison of mechanical stimuli and sensitivity to modeling parameters

Joël Cugnoni, John Botsis, Marco Piccinini

Long term durability of osseointegrated implants depends on bone adaptation to stress and strain occurring in proximity of the prosthesis. Mechanical overloading, as well as disuse, may reduce the stability of implants by provoking bone resorption. However ...

Elsevier2016

Multi-scale modeling of elasto-plastic response of SnAgCu lead-free solder alloys at different ageing conditions: Effect of microstructure evolution, particle size effects and interfacial failure

Joël Cugnoni, John Botsis, Milad Maleki

In microelectronics applications, SnAgCu lead-free solder joints play the important role of ensuring both the mechanical and electrical integrity of the components. In such applications, the SnAgCu joints are subjected to elevated homologous temperatures f ...

Elsevier2016

Delamination in cross-ply laminates: Identification of traction-separation relations and cohesive zone modeling

Joël Cugnoni, John Botsis, Ebrahim Farmand Ashtiani, David Enrique Alanis Rojas

Identification of traction separation relations is at the forefront of damage and fracture mechanics of composite laminates. Such relations are of particular interest in fracture of laminates consisting of layers of different fiber orientations. In this st ...

Elsevier2015

Mode I fracture of thin-ply carbon-epoxy laminates: effects of ply and specimen thickness

Joël Cugnoni, Thomas Gmür, John Botsis, Guillaume Frossard, Martin Boesiger

IMDEA Materials Institute2015

Fracture of thin-ply carbon-epoxy laminates: ply-thickness effects

Joël Cugnoni, Thomas Gmür, John Botsis, Guillaume Frossard

2015

Monitoring of composite structures using a network of integrated PVDF film transducers

Joël Cugnoni, Thomas Gmür, Enrique René Guzman Solares

Aiming to reduce costs, polyvinylidene difluoride (PVDF) film patches are an emerging alternative to more classic piezoelectric technologies, like ceramic patches, as transducers to measure local deformation in many structural applications. This choice is ...

Institute of Physics2015

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

Joël Cugnoni, John Botsis, 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