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Joël Cugnoni

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Publications associées (83)

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

Joël Cugnoni, Thomas Gmür, John Botsis, 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

Low energy impact damage monitoring of composites using dynamic strain signals from FBG sensors - Part II: Damage identification

Joël Cugnoni, Thomas Gmür, John Botsis, Jeannot Frieden

In part I of this two-paper series, a method for the localization of an impact using dynamic strain signals from fiber Bragg grating (FBG) sensors is presented. In this paper, an inverse numerical-experimental method allowing to identify the damage based o ...

2012

An experimental-numerical study of moisture absorption in an epoxy

Joël Cugnoni, John Botsis, 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

Identification of the elastic and damping properties in sandwich structures with a low core-to-skin stiffness ratio

Joël Cugnoni, Alain Schorderet, Thomas Gmür, Marco Matter

A mixed numerical-experimental identification procedure for estimating the storage and loss properties in sandwich structures with a soft core is developed The proposed method uses at the experimental level a precise measurement setup with an electro-dynam ...

2011

Vibration-based characterization of impact induced delamination in composite plates using embedded FBG sensors and numerical modelling

Joël Cugnoni, John Botsis, Jeannot Frieden

Dynamic strain signals from embedded fiber Bragg grating sensors are used for experimental modal analysis in carbon fiber reinforced polymer plates. Throughout a series of impact tests, the change of eigen-frequencies due to damage is evaluated for differe ...

2011

Characterization of impact damage in fibre reinforced composite plates using embedded FBG sensors

Joël Cugnoni, Thomas Gmür, John Botsis, Jeannot Frieden

EPFL2011

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

Joël Cugnoni, Elvis Fornasiere, Matteo Galli

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

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

Joël Cugnoni, John Botsis, Marzio Bergomi, Matteo Galli

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

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

Joël Cugnoni, John Botsis, 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

Low-velocity impact damage identification in CFRP plates using inverse numerical-experimental optimization

Joël Cugnoni, Thomas Gmür, John Botsis, Jeannot Frieden

FEUP2011

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

Joël Cugnoni, John Botsis, 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

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

Joël Cugnoni, John Botsis, 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

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

Joël Cugnoni, John Botsis, 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

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

Joël Cugnoni, Thomas Gmür, John Botsis, 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

A PSDT shell finite element formulation including structural damping

Joël Cugnoni, Alain Schorderet, Thomas Gmür, 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

Damage assessment in CFRP plates based on dynamic measurements with FBG sensors

Joël Cugnoni, Thomas Gmür, John Botsis, Jeannot Frieden

Civil-Comp Press2010

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

Joël Cugnoni, John Botsis, Marzio Bergomi, Philipp Schneider, Marco Stampanoni

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

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

Pressure-Regulated Gas Diffusion in Human Terminal Chorionic Villi

Joël Cugnoni

2009

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

Joël Cugnoni, Alain Schorderet, Thomas Gmür, 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

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