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Anastasios Vassilopoulos

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Publications associées (184)

Shear Buckling Resistance of GFRP Plate Girders

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

Thin webs of glass-fiber-reinforced polymer (GFRP) girders are sensitive to shear buckling, which can be considered an in-plane biaxial compression-tension buckling problem, according to the rotated stress field theory. An extensive experimental study was ...

American Society of Civil Engineers2011

Mechanical recovery of epoxy adhesives subsequent to exceeding glass transition temperature

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

2011

A computational tool for the life prediction of GFRP laminates under irregular complex stress states: influence of the fatigue failure criterion

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos, Roohollah Sarfaraz Khabbaz

A new computational tool for the fatigue life prediction of composite materials, designated CCfatigue, is presented in this paper. This new software has been developed based on a well-established phenomenological fatigue life prediction methodology. It is ...

Elsevier2010

Effects of low and high temperatures on tensile behavior of adhesively-bonded GFRP joints

Thomas Keller, Anastasios Vassilopoulos, Yi Zhang

The tensile behavior of adhesively-bonded double-lap joints composed of pultruded glass fiber-reinforced adherends and an epoxy adhesive was investigated under temperatures ranging between -35°C and 60°C. The load-elongation response was influenced primari ...

2010

Influence of the constant life diagram formulation on the fatigue life prediction of composite materials

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

The influence of the constant life diagram (CLD) formulation on the fatigue life prediction of composite materials was examined. Most commonly used and recently proposed CLDs applied on composite materials fatigue data are presented and their applicability ...

Elsevier2010

Thermomechanical behavior of multifunctional GFRP sandwich structures with encapsulated photovoltaic cells

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

The feasibility of encapsulating solar cells into the glass fiber-reinforced polymer (GFRP) skins of load-bearing and thermally insulating sandwich elements with foam cores has been evaluated. Exposure of the encapsulated cells to artificial sunlight led t ...

American Society of Civil Engineers2010

Shear wrinkling of GFRP webs in cell-core sanwiches

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

Glass fiber-reinforced (GFRP) cell-core sandwich structures are increasingly used in bridge deck and roof construction. GFRP cell-core sandwiches are composed of the outer GFRP face sheets, a foam core and a grid of GFRP webs integrated into the core in or ...

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa2010

Mixed-mode fracture of adhesively-bonded pultruded composite lap joints

Thomas Keller, Anastasios Vassilopoulos, Yi Zhang

The fracture behavior of adhesively-bonded double- and stepped-lap joints composed of pultruded glass fiber-reinforced polymer composite laminates and subjected to axial tension was experimentally investigated and numerically modeled. Two methods were used ...

Elsevier2010

Mode I an II fracture behavior of adhesively-bonded pultruded composite joints

Thomas Keller, Anastasios Vassilopoulos, Yi Zhang

The Mode I and II fracture behaviors of adhesively-bonded joints composed of pultruded glass fiber-reinforced polymer (GFRP) laminates were experimentally investigated using Double-Cantilever-Beam (DCB) and End-Loaded-Split (ELS) specimens. The large speci ...

Elsevier2010

PNL constant life diagram formulation for FRP composites materials

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

2010

Piecewise non-linear constant life diagram formulation for FRP composite materials

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

A new formulation for predicting an asymmetric, piecewise non-linear constant life diagram (CLD) is introduced in this paper. The development of the new model is based on the representation of the fatigue data on the stress ratio (R)-stress amplitude (σa) ...

Elsevier2010

Fracture of adhesively-bonded pultruded GFRP joints under constant amplitude fatigue loading

Thomas Keller, Anastasios Vassilopoulos, Yi Zhang

The fracture behavior of adhesively-bonded structural joints under tensile constant amplitude fatigue has been investigated. Double-lap joints (DLJs) and stepped-lap joints (SLJs) composed of pultruded GFRP laminates and an epoxy adhesive were examined. Bo ...

Elsevier2010

A computational tool for the fatigue life prediction of composite materials

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

2009

Modeling of the fatigue life of adhesively-bonded FRP joints with genetic programming

Thomas Keller, Anastasios Vassilopoulos

2009

Environmental effects on fatigue behavior of adhesively-bonded pultruded structural joints

Thomas Keller, Ye Zhang, Anastasios Vassilopoulos

The fatigue response of adhesively-bonded pultruded GFRP double-lap joints has been investigated under different environmental conditions. Tests were performed at -35 °C, 23 °C and 40 °C. A fourth set of fatigue data was collected from tests on preconditio ...

2009

Adaptive neuro-fuzzy inference system in modelling fatigue life of multidirectional composite laminates

Anastasios Vassilopoulos

Adaptive neuro-fuzzy inference system (ANFIS) has been successfully used for the modelling of fatigue behaviour of a multidirectional composite laminate. The evaluation of the neuro-fuzzy model has been performed using a data base containing 257 valid fati ...

2008

Stiffness degradation and life prediction of adhesively- bonded joints for FRP composites

Thomas Keller, Ye Zhang, Anastasios Vassilopoulos

2008

Comparison of genetic programming with conventional methods for fatigue life modeling of FRP composite materials

Thomas Keller, Anastasios Vassilopoulos

Genetic programming is used in this paper for modeling the fatigue life of several fiber-reinforced composite material systems. It is shown that if the genetic programming tool is adequately trained, it can produce theoretical predictions that compare favo ...

2008

Stiffness degradation and life prediction of adhesively- bonded joints for fiber-reinforced polymer composites

Thomas Keller, Ye Zhang, Anastasios Vassilopoulos

Adhesively-bonded joints, including double- and stepped- lap joints (DLJs and SLJs), were experimentally investigated under cyclic tensile loading. The joints were composed of pultruded GFRP laminates and epoxy adhesive. A critical stiffness was found for ...

2008

Fatigue failure of adhesively-bonded structural joints for FRP composites

Thomas Keller, Ye Zhang, Anastasios Vassilopoulos

2008

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