Publications de Dragan Coric | EPFL Graph Search

An experimental-numerical study of moisture absorption in an epoxy

John Botsis, Marco Lai, Joël Cugnoni, Dragan Coric

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

Monitoring of non-homogeneous strains in composites with embedded wavelength multiplexed fiber Bragg gratings: A methodological study

John Botsis, Dragan Coric, Samuel Stutz

For the detection of problems like fastening failures and delamination in composites, the employment of embedded fiber Bragg grating (FBG) sensors is considered an effective tool to measure non-homogeneous internal strains near damage or interfaces of diss ...

2012

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

John Botsis, Thomas Gmür, Joël Cugnoni, Dragan Coric, Jeannot Frieden

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

Distributed strain measurements using fiber Bragg gratings in small-diameter optical fiber and low-coherence reflectometry

John Botsis, Marco Lai, Hans Georg Limberger, Dragan Coric, Aiping Luo

Optical low coherence reflectometry and fiber Bragg gratings written in small diameter (50 micrometer) optical fibers were used for measurements of non-homogenous internal strain fields inside an epoxy specimen with sub-grating length resolution. The resul ...

Optical Society of America2010

Internal strain measurements in CFRP plates subjected to impact load using FBG sensors

John Botsis, Thomas Gmür, Joël Cugnoni, Jeannot Frieden, Dragan Coric

The British Composites Society2009

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

John Botsis, Marco Lai, Joël Cugnoni, Dragan Coric

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

Characterization of dynamic response of composite plates with embedded FBG sensors

John Botsis, Thomas Gmür, Joël Cugnoni, Jeannot Frieden, Dragan Coric

University of Dayton Press2008

Distributed sensing using polarization sensitive optical low-coherence reflectometry and fiber gratings

Dragan Coric

Optical low coherence reflectometry (OLCR) is non-destructive interferometric technique that allows measuring amplitude and phase of the light reflected from the device under test. OLCR is a powerful tool for the characterization of the various optical dev ...

EPFL2007

Light-controlled reconfigurable fiber bragg gratings written in attenuation fiber

Hans Georg Limberger, René Salathé, Dragan Coric, Rodrigue Chatton, Yari Luchessa

A novel type of light controlled fiber Bragg gratings written in attenuation fiber is demonstrated. The spectral reconfiguration can be controlled by the pump power, the pumping configuration, the grating position and the fiber attenuation. © Optical Socie ...

Institute of Electrical and Electronics Engineers Computer Society2007

Distributed measurements of fiber birefringence and diametric load using optical low-coherence reflectometry and fiber gratings

Hans Georg Limberger, René Salathé, Dragan Coric

Optical Society of America2006