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Joël Cugnoni

Cette personne a quitté l’EPFL

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Publications associées (80)

Page 1 sur 4

An experimental-numerical study of moisture absorption in an epoxy

John Botsis, Joël Cugnoni, Dragan Coric, Marco Lai

It is well known that moisture absorption impairs the mechanical and physical properties of polymers. Conventionally, the material's hygric strains are described as the product of a constant coefficient of moisture expansion (CME) and moisture concentratio ...

2012

Three-dimensional morphometry of strained bovine periodontal ligament using synchrotron radiation-based tomography

John Botsis, Joël Cugnoni, Marzio Bergomi

The periodontal ligament (PDL) is a highly vascularized soft connective tissue. Previous studies suggest that the viscous component of the mechanical response may be explained by the deformation-induced collapse and expansion of internal voids (i.e. chiefl ...

2010

Experimental and numerical studies on size and constraining effects in lead-free solder joints

John Botsis, Joël Cugnoni

Search String Advanced > Saved Searches > ARTICLE TOOLS Get PDF (641K) Save to My Profile E-mail Link to this Article Export Citation for this Article Get Citation Alerts Request Permissions More Sharing ServicesShare | Share on citeuli ...

2007

On the Mutual Effect of Viscoplasticity and Interfacial Damage Progression in Interfacial Fracture of Lead-Free Solder Joints

John Botsis, Joël Cugnoni, Milad Maleki

The main goal of this paper is to shed light on the effect of strain rate and viscoplastic deformation of bulk solder on the interfacial failure of lead-free solder joints. For this purpose, interfacial damage evolution and mode I fracture behavior of the ...

Springer US2011

Crack - fiber sensor interaction and characterization of the bridging tractions in mode I delamination

John Botsis, Joël Cugnoni, Samuel Stutz

Fiber bridging is regularly encountered in model delamination tests of unidirectional fiber reinforced composites. However, characterization of the bridging tractions is rather difficult. One way to indirectly evaluate the bridging traction distribution is ...

2011

Poroviscoelastic Characterization of Particle-Reinforced Gelatin Gels using Indentation and Homogenization

Joël Cugnoni, Matteo Galli, Elvis Fornasiere

Hydrogels are promising materials for bioengineering applications, and are good model materials for the study of hydrated biological tissues. As these materials often have a structural function, the measurement of their mechanical properties is of fundamen ...

Elsevier2011

Microstructure-based modeling of the ageing effect on the deformation behavior of the eutectic micro-constituent in SnAgCu lead-free solder

John Botsis, Joël Cugnoni, Milad Maleki

The eutectic micro-constituent in SnAgCu solder governs the deformation behavior of the joint as it shows better deformation resistance than the Sn dendrites and occupies a high volume percentage of the whole solder. The main scope of this study is to deve ...

Elsevier2013

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

Thomas Gmür, Joël Cugnoni, Alain Schorderet, Marco Matter

A novel method is presented for estimating the elastic and dissipative parameters of composite plates and shells through a mixed numerical-experimental identification procedure based on the natural frequencies, modal damping factors and mode shapes of the ...

2009

Hydro-mechanical coupling in the periodontal ligament: A porohyperelastic finite element model

John Botsis, Joël Cugnoni, Matteo Galli, Marzio Bergomi

Harmonic tension–compression tests at 0.1, 0.5 and 1 Hz on hydrated bovine periodontal ligament (PDL) were numerically simulated. The process was modeled by finite elements (FE) within the framework of poromechanics, with the objective of isolating the con ...

Elsevier2011

Low energy impact damage monitoring of composites using dynamic strain signals from FBG sensors - Part I: Impact detection and localization

John Botsis, Thomas Gmür, Joël Cugnoni, Jeannot Frieden

Fiber reinforced composite materials risk to suffer from subsurface, barely visible, damage induced by transverse relatively low energy impacts. This two-paper series presents a method for the localization of an impact and identification of an eventual dam ...

2012

Representative Volume Element Size of Elastoplastic and Elastoviscoplastic Particle-Reinforced Composites with Random Microstructure

Joël Cugnoni, Matteo Galli

With the progress of miniaturization, in many modern applications the characteristic dimensions of the physical volume occupied by particle-reinforced composites are getting comparable with the reinforcement size and many of those composite materials under ...

2010

On the degree of conversion and coefficient of thermal expansion of a single fiber composite using a FBG sensor

John Botsis, Joël Cugnoni, Dragan Coric, Marco Lai

The increasing needs of extending the lifetime in high-technology fields, such as space and aerospace, rail transport and naval systems, require quality enhancing of the composite materials either from a processing standing point or in the sense of resista ...

Amer Inst Physics, 2 Huntington Quadrangle, Ste 1No1 D, Melville, Ny 11747-4501 Usa2008

A PSDT shell finite element formulation including structural damping

Thomas Gmür, Joël Cugnoni, Alain Schorderet, Marco Matter

This paper describes efficient C-0-compatible finite elements for modelling structurally damped laminated composite plates and shells under harmonic vibrations. Based upon a shear deformation theory of any order p (PSDT), the elements are well adapted for ...

2010

Interfacial intermetallic growth and strength of composite lead-free solder alloy through isothermal aging

John Botsis, Joël Cugnoni

The effects of particle reinforcement of Sn-4.0wt.%Ag-0.5wt.%Cu (SAC405) lead-free solder on interfacial intermetallic layer growth and strength of the ensuing joints through short-term isothermal aging (150 degrees C) were studied. Composite solders were ...

Springer US2008

Monitoring of process induced strains in a single fibre composite using FBG sensor: A methodological study

John Botsis, Joël Cugnoni

A partially embedded long fibre-Bragg grating (FBG) into an epoxy cylindrical specimen is used to monitor the strain distribution evolution along its axis when subjected to subsequent cycles of thermal ageing at 70 and 110 degrees C. Assuming a total volum ...

2008

Studies of mode I delamination in monotonic and fatigue loading using FBG wavelength multiplexing and numerical analysis

John Botsis, Joël Cugnoni, Samuel Stutz

Bridging by intact fibers in composite materials is one of the most important toughening mechanisms. However, a direct experimental assessment of its contribution is not easy to achieve. In this work a semi-experimental method is proposed to quantify its c ...

2011

Isothermal Ageing of SnAgCu Solder Alloys: Three-Dimensional Morphometry Analysis of Microstructural Evolution and Its Effects on Mechanical Response

John Botsis, Joël Cugnoni, Milad Maleki

Due to the high homologous temperature and fast cooling rates, the microstructures of SnAgCu (SAC) solders are in a meta-stable state in most applications, which is the cause of significant microstructural evolution and continuous variation in the mechanic ...

Springer2014

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

John Botsis, Joël Cugnoni, 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

Thin ply composites: Experimental characterization and modeling of size-effects

John Botsis, Joël Cugnoni, Larissa Sorensen, Robin Amacher

Thin-ply composites are rapidly gaining interest in the composite industry, not only because of the larger design possibilities that they offer, but also because of positive size effects that have been shown to improve performance in various loading condit ...

Elsevier2014

Monitoring and characterization of the interfacial fracture in sandwich composites with embedded multiplexed optical sensors

John Botsis, Joël Cugnoni, Ebrahim Farmand Ashtiani

Interfacial debonding is one of the most critical damage modes that threatens the structural performance of sandwich composites. In this work, integrated multiplexed fiber Bragg grating (FBG) sensors of 1 mm gauge length are used for detection and characte ...

Elsevier Sci Ltd2013