Publications de Thomas Gmür | EPFL Graph Search

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

Joël Cugnoni, Thomas Gmür, John Botsis, Guillaume Frossard

2018

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

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

Multi-factorial models of a carbon fibre/epoxy composite subjected to accelerated environmental ageing

Joël Cugnoni, Thomas Gmür, Enrique René Guzman Solares

Among materials being introduced in the aerospace industry, the carbon fibre reinforced plastics (CFRP) have a place of privilege because of their exceptional stiffness-to-mass ratio. However, the polymer-based matrix is vulnerable to damages by environmen ...

Elsevier2014

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

Joël Cugnoni, Thomas Gmür, John Botsis, Guillaume Frossard

2014

A new structural health monitoring (SHM) system using integrated polyvinylidene difluoride (PVDF) transducer networks

Joël Cugnoni, Thomas Gmür, Enrique René Guzman Solares

2014

Use of PVDF transducers as actuators for operational modal analysis on composite samples

Joël Cugnoni, Thomas Gmür, Enrique René Guzman Solares

2013

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

Joël Cugnoni, Thomas Gmür, Enrique René Guzman Solares

Aalborg University2013

Accelerated isothermal and cyclic ageing of carbon fibre/epoxy composite panels with integrated PVDF sensors

Joël Cugnoni, Thomas Gmür, Enrique René Guzman Solares

FEUP2012

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

Composites Part A: Applied Science and Manufacturing

Thomas Gmür, John Botsis

Elsevier2012

Modal numerical-experimental identification method for characterising the elastic and damping properties in sandwich structures with a relatively stiff core

Thomas Gmür, Jeannot Frieden, Michaël Schwaar

In this paper, a mixed numerical-experimental identification procedure for characterising the storage and loss properties in sandwich structures with a relatively stiff core is developed. At the computational level, the proposed method is based upon an ori ...

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

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

Joël Cugnoni, Thomas Gmür, John Botsis, Jeannot Frieden

EPFL2011

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

Joël Cugnoni, Thomas Gmür, John Botsis, Jeannot Frieden

FEUP2011

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