Publications by Marco Lai | EPFL Graph Search

Studies of hygrothermal degradation of a single fiber composite: An iterative approach with embedded optical sensors and numerical analysis

The hydrothermal ageing of glass/epoxy interface is investigated using an experimental numerical approach on cylindrical epoxy specimens with centrally located optical fibers. A 24 mm long Bragg grating sensor is inscribed on the optical fiber and used to ...

Elsevier2014

On the Effects of the Lateral Strains on the Fiber Bragg Grating Response

John Botsis, Dimitrios Karalekas, Marco Lai

In this paper, a combined experimental-numerical based work was undertaken to investigate the Bragg wavelength shift response of an embedded FBG sensor when subjected to different conditions of multi-axial loading (deformation). The following cases are exa ...

Mdpi Ag2013

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

Hygrothermal Ageing and Damage Characterization in Epoxies and in Epoxy-Glass Interfaces : a Micromechanical Approach Using Embedded Optical Sensors

Marco Lai

Nowadays, composite materials are increasingly used in high technology fields such as aerospace and automotive because of the combination of excellent mechanical performance and lightweight. For these characteristics, classical metal alloys are progressive ...

EPFL2011

Evaluation of residual strains in epoxy with different nano/micro-fillers using embedded fiber Bragg grating sensor

John Botsis, Marco Lai, Klaus Friedrich

The Influence of SiO2 nanoparticles and rubber micro-fillers on the mechanical and thermal responses of an epoxy based composite is investigated using classical quantitative thermo-mechanical testing (tensile tests DMTA TMA) microstructural analysis (Micro ...

2010

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

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

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

Joël Cugnoni, John Botsis, 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