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Thomas Keller

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Publications associées (309)

Mechanical properties of FRP materials at elevated temperature-Definition of a temperature conversion factor for design in service conditions

Thomas Keller

One of the main concerns about the use of fibre-reinforced polymer (FRP) materials in civil engineering struc-tures is the potential reduction of their stiffness-and strength-related properties when exposed to elevated temperature. This concern, mostly due ...

ELSEVIER SCI LTD2023

TWO-DIMENSIONAL MODE-II DELAMINATION GROWTH IN COMPOSITE LAMINATES

Thomas Keller, Anastasios Vassilopoulos, Congzhe Wang

2023

Effect of fiber architecture on tension-tension fatigue behavior of bolted basalt composite joints

Thomas Keller, Lulu Liu, Xin Wang

The effect of fiber architecture, i.e., unidirectional (UD) vs. multi-directional (MD), on the tension-tension fa-tigue behavior of bolted double-lap basalt composite joints was experimentally investigated. The fatigue load-life (F -N) curves of MD and UD ...

ELSEVIER SCI LTD2023

Effects of core air gaps and steel inserts on thermal response of GFRP-balsa sandwich panels subjected to fire

Thomas Keller, Anastasios Vassilopoulos, Niloufar Vahedi

Sandwich systems composed of combustible glass fiber-reinforced polymer (GFRP) face sheets and balsa cores must fulfill fire resistance requirements if used, for instance, in bridge or building construction. Air gaps and steel inserts in the balsa core, th ...

ELSEVIER SCI LTD2022

Thermophysical and thermomechanical properties of basalt-phenolic FRP rebars under high temperature

Thomas Keller, Hongwei Zhu, Ting Li, Jiahui Shen

An experimental investigation was conducted on the thermophysical and thermomechanical properties of phenolic-basalt fiber-reinforced polymer (P-BFRP) rebars subjected to high temperature. As a comparison, vinylBFRP (V-BFRP) and epoxy-BFRP (E-BFRP) rebars ...

ELSEVIER SCI LTD2022

Design of fibre-polymer composite structures – European Technical Specification: Fatigue and detailing

Thomas Keller

2022

Static and fatigue behavior of bonded, bolted and hybrid FRP joints

Thomas Keller, Lulu Liu

2022

Viscoelastic adhesive modeling of ductile adhesive-composite joints during cyclic loading

Thomas Keller, Abdolvahid Movahedirad, Ghazaleh Eslami

2022

Mechanical Properties of FRP Materials at Elevated Temperature. Definition of a Temperature Conversion Factor for Design in Service Conditions

Thomas Keller, Mário Alexandre De Jesus Garrido

One of the main concerns about the use of fibre reinforced polymer (FRP) materials in civil engineering structural applications is the potential reduction of their stiffness- and strength-related properties when exposed to elevated temperature. The first p ...

SPRINGER-VERLAG SINGAPORE PTE LTD2022

A novel fatigue life prediction methodology based on energy dissipation in viscoelastic materials (vol 152, 106457, 2021)

Thomas Keller, Ghazaleh Eslami

ELSEVIER SCI LTD2022

Rate dependent adhesive modeling of ductile adhesive composite joints

Thomas Keller, Ghazaleh Eslami

2022

Fiber-polymer composites for permanent large-scale bending-active elastica beams

Thomas Keller, Tara Habibi

Bending-active represents a structural typology whose geometry is based on the elastic deformation of initially straight members that, in the case of beams, are known as elastica. Until now, fiber-polymer composites were used only for small-scale temporary ...

ELSEVIER SCI LTD2022

Thermal and mechanical performances of GFRP sandwich structures with integrated amorphous silicon photovoltaic cells

Thomas Keller, Yu Bai

Applications of photovoltaic (PV) cells in buildings are often excluded from locations with major mechanical strains because of their brittleness and possible damages at small mechanical strains. Combinations of glass fibre reinforced polymer (GFRP) compon ...

ELSEVIER SCI LTD2022

Thermophysical properties of balsa wood used as core of sandwich composite bridge decks exposed to external fire

Thomas Keller, Anastasios Vassilopoulos, Niloufar Vahedi

The load-bearing performance of sandwich bridge decks comprising a balsa core and fiber-reinforced polymer composite face sheets exposed to fire is a main concern regarding the application of these deck systems. In order to obtain the thermal responses of ...

ELSEVIER SCI LTD2022

Tension-tension fatigue behavior of ductile adhesively-bonded FRP joints

Thomas Keller, Lulu Liu, Xin Wang

The tension-tension fatigue behavior of ductile adhesively-bonded double-lap FRP joints was experimentally investigated. An acrylic adhesive, which was in the rubbery state at ambient temperature, provided the joint ductility. The fatigue degradation of th ...

2021

Towards multifunctional building elements: thermal activation of a composite interior GFRP slab

Thomas Keller, Madeline Pugin, Dolaana Khovalyg

Modular multifunctional building elements can overcome major disadvantages of the traditional sequential design and become prospective design solutions for sustainable construction. Thus, this work explores lightweight glass fiber-reinforced polymer (GFRP) ...

IOP Science2021

Design and foldability of Miura-based cylindrical origami structures

Thomas Keller, Yuntong Du

A methodology for designing cylindrical origami with different patterns and different cross-sectional shapes is presented. Planar and cylindrical origami with curved-crease patterns are designed and proved to be foldable and developable regardless of the t ...

ELSEVIER SCI LTD2021

Static and dynamic mechanical properties of nanosilica and multiwalled carbon nanotube reinforced acrylonitrile butadiene styrene composites: theoretical mechanism of nanofiller reinforcement

Thomas Keller, Harish Mohan Thettemmel

Experimental and theoretical approaches were employed to analyze the static and dynamic mechanical properties of acrylonitrile butadiene styrene (ABS) nanocomposites reinforced with multiwalled carbon nanotube (MWCNT) and nanosilica. Enhanced stiffness and ...

SPRINGER2021

Experimental investigation on the moment-rotation performance of pultruded FRP web-flange junctions

Thomas Keller

This paper aims to present an experimental investigation on the behavior of web-flange junctions (WFJs) rotational stiffness of pultruded fiber-reinforced polymer composites (FRP). Channels and I-sections were tested using a simple set-up, which was develo ...

ELSEVIER SCI LTD2021

Numerical modeling of two-dimensional delamination growth in composite laminates with in-plane isotropy

Thomas Keller, Anastasios Vassilopoulos, Congzhe Wang

The two-dimensional (2D) delamination growth in fiber-reinforced polymer (FRP) laminates with in-plane isotropy under Mode I loading condition was numerically investigated using finite element analyses. Two sizes of plate models were developed, focusing on ...

2021

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