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Thomas Gmür

Cette personne a quitté l’EPFL

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Publications associées (48)

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

Thomas Gmür, Jeannot Frieden

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

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

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

Stress and failure analysis of crimped metal-composite joints used in electrical insulators subjected to bending

John Botsis, Thomas Gmür, Alain Michel Prenleloup

Experimental and numerical investigations are carried out on metal/fibregiass-reinforced-plastic joints integrated in electrical insulators subject to bending. Numerical stress and strain distributions through the bond are calculated with a solid 3D finite ...

2009

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

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

Joël Cugnoni, Thomas Gmür, Alain Schorderet, 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

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

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

Thomas Gmür, Joël Cugnoni, 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

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

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

Thomas Gmür, Joël Cugnoni, 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

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

Thomas Gmür

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

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

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

Stress and failure analysis of crimped metal-composite joints used in electrical insulators subjected to bending

A PSDT shell finite element formulation including structural damping

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

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

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

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

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

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

Composites Part A: Applied Science and Manufacturing

Acoustic emission study and strength analysis of crimped steel-composite joints under traction

Improved dynamic characterization of the elastic properties in composite plates

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

Delamination propagation measurement using long gauge-length FBG sensors

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