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Julia De Castro San Roman Fest

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Publications associées (44)

Page 1 sur 3

Shear mechanical characterization of balsa wood as core material of composite sandwich panels

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Michael Osei-Antwi

An experimental study was performed using Iosipescu specimens to evaluate the effects of parameters such as shear plane, density and adhesive joints on the shear stiffness and strength of balsa wood panels as well as the variation of ductility with respect ...

Elsevier2013

System ductility and redundancy of FRP structures with ductile adhesively-bonded joints

Julia De Castro San Roman Fest

Fiber-reinforced polymer (FRP) composites offer several advantages in relation to traditional materials, such as high specific strength, good corrosion resistance, low thermal conductivity and rapid component installation. Despite the great potential of th ...

EPFL2005

Energy dissipation and recovery in web-flange junctions of pultruded GFRP decks

Thomas Keller, Julia De Castro San Roman Fest, Sonia Yanes Armas

The energy dissipation capacity resulting from progressive cracking and the recovery after unloading of the web-flange junctions (WFJs) of a pultruded GFRP deck were experimentally investigated. Web-cantilever bending experiments up to failure were perform ...

Elsevier2016

Energy dissipation in web-flange junctions of pultruded GFRP decks

Thomas Keller, Julia De Castro San Roman Fest, Sonia Yanes Armas

The energy dissipation capacity resulting from progressive cracking of the web-flange junctions (WFJs) of a pultruded GFRP deck system was experimentally investigated. Web-cantilever bending experiments up to failure were performed on two WFJ types (IfO, I ...

2015

Rotational stiffness of web-flange junctions of pultruded GFRP decks

Thomas Keller, Julia De Castro San Roman Fest, Sonia Yanes Armas

The rotational behavior of the web-flange junctions (WFJs) of a pultruded glass fiber-reinforced polymer (GFRP) bridge deck system with trapezoidal cell cross-sectional geometry was investigated. The rotational response of three WFJ types, in two bending m ...

Elsevier2017

Modeling of axial and shear stresses in multilayer Sandwich beams with stiff core layers

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Michael Osei-Antwi

In order to optimize the load-bearing behavior of sandwich structures and adapt it to specific requirements, their core may be composed of layers of different materials with tailored properties. These layers may consist not only of soft foam or honeycomb m ...

Elsevier2014

Design of robust and ductile FRP structures incorporating ductile adhesive joints

Thomas Keller, Julia De Castro San Roman Fest

A design concept for engineering structures consisting of brittle FRP components and ductile adhesive joints is proposed. The elastoplastic adhesive joints provide system ductility that compensates for the material ductility that FRP composites lack. In th ...

2010

Fracture in complex balsa cores of fiber-reinforced polymer sandwich structures

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Michael Osei-Antwi

Fracture in the complex balsa cores of fiber-reinforced polymer (FRP) sandwich beams was analyzed. The cores were composed of high- and low-density balsa layers separated by a circular adhesive interface or FRP arch. The balsa layers were cut from panels w ...

Elsevier2014

Light diffusion in GFRP laminates for building construction

Thomas Keller, Andreas Schueler, Julia De Castro San Roman Fest, André Gabriel Kostro, Carlos Pascual Agullo

The light diffusion of hand lay-up glass fiber-reinforced polymer (GFRP) laminates was investigated with a spectrophotometric set-up using an integrating sphere. Reinforcement weights of the laminates ranged from 410 to 3280 g/m2 and fiber volume fractions ...

2014

Analytical modeling of local stresses at Balsa/timber core joints of FRP sandwich structures

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Michael Osei-Antwi

In order to optimize sandwich structures, core materials of different density and thus different stiffness and strength are often combined. The material discontinuities at joints of dissimilar core materials may lead to abrupt changes of the shear angles a ...

Elsevier2014

Early-age tensile properties of structural epoxy adhesives subjected to low-temperature curing

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Omar Moussa

The early-age mechanical property development of structural adhesives during low temperature curing is critical for the outdoor construction of engineering structures, such as bridges or buildings. Construction of these structures is also carried out durin ...

2012

Total light transmittance of glass fiber-reinforced polymer laminates for multifunctional load-bearing structures

Thomas Keller, Anastasios Vassilopoulos, Andreas Schueler, Julia De Castro San Roman Fest, Carlos Pascual Agullo

The total light transmittance of hand lay-up glass fiber-reinforced polymer laminates for building construction was investigated with a view to two architectural applications: translucent load-bearing structures and the encapsulation of photovoltaic cells ...

SAGE Publications2014

Performance in Transverse Direction of Fiber‐Reinforced Polymer Bridge Decks

Thomas Keller, Julia De Castro San Roman Fest, Sonia Yanes Armas

Pultruded glass fiber‐reinforced polymer (GFRP) bridge decks distribute punctual vehicular loads to the underlying superstructure and can also act as the upper chord of hybrid main girders. The deck’s structural performance in both cases is influenced by i ...

International Association for Bridge and Structural Engineering - IABSE2015

Total light transmittance of GFRP laminates for building construction

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Carlos Pascual Agullo

The total light transmittance of hand lay-up glass fiber-reinforced polymer (GFRP) laminates for building construction was investigated for the purpose of two architectural applications: translucent load-bearing building envelopes and the encapsulation of ...

2014

Time-temperature dependence of thermomechanical recovery of cold-curing structural adhesives

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Omar Moussa

The thermomechanical recovery behavior of a commercial cold-curing structural epoxy adhesive was investigated. Exposing the adhesive to temperatures above the glass transition temperature T-g significantly increased the latter although the curing degree in ...

2012

Instability of Thin-Walled GFRP Webs in Cell-Core Sandwiches under Combined Bending and Shear Loads

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Behzad Dehghan Manshadi

An analytical investigation of the buckling/wrinkling behavior of GFRP webs in cell-core sandwiches subjected to combined in-plane shear and bending stresses is conducted. Web-core panels are modeled as long orthotropic plates stabilized by a relatively th ...

2012

An analytical model for lateral contraction of composite laminates subjected to partially uniform tension

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Behzad Dehghan Manshadi

An analytical approach to determine the in-plane stress field and thereby the lateral contraction of composite rectangular plates subjected to partially uniform tension is presented. This approach is based on the Green function hypothesis and is able to ac ...

Pergamon-Elsevier Science Ltd2013

System transverse in-plane shear stiffness of pultruded GFRP bridge decks

Thomas Keller, Julia De Castro San Roman Fest, Sonia Yanes Armas

The static transverse behavior of two pultruded GFRP deck systems with trapezoidal (DS) and triangular (AS) cell cross-sectional geometry was experimentally investigated in order to study their transverse in-plane shear stiffness. Symmetric three-point ben ...

Elsevier2016

Aramid/glass fiber-reinforced thermal break - thermal and structural performance

Thomas Keller, Julia De Castro San Roman Fest, Kyriaki Goulouti

Energetically weak points in thermally insulated building envelopes are formed by thermal breaks that are implemented to structurally connect external balconies to internal slabs. Current thermal breaks comprise stainless steel bars that penetrate the insu ...

Elsevier2016

FRP-balsa composite sandwich bridge deck with complex core configuration

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Michael Osei-Antwi

The aim of this work was to investigate to what extent the performance of a glass fiberreinforced polymer (GFRP) sandwich slab-bridge with uniform high-density balsa core could be improved in terms of structural efficiency and weight thanks to a more compl ...

2014