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Anastasios Vassilopoulos

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Publications associées (184)

Quantification of spatial variability for transverse elastic modulus of spruce wood

Thomas Keller, Anastasios Vassilopoulos, Alireza Farajzadeh Moshtaghin, Steffen Franke

Different factors such as age, location of timber within the tree, structural imperfections, load history such as wind and snow etc. can affect the material properties of timber. Consequently, there is a high variability in the mechanical properties which ...

2016

Creep-fatigue interaction in composite materials

Thomas Keller, Anastasios Vassilopoulos, Abdolvahid Movahedirad

A novel phenomenological model taking into account the creep-fatigue interaction in composite materials’ fatigue performance is introduced in this paper. The model is based on the derivation of a master curve by using existing experimental fatigue data fro ...

2016

Pull-out behavior of CFRP single-strap ground anchors

Thomas Keller, Anastasios Vassilopoulos, Haifeng Fan

Pull-out experiments were performed on four carbon fiber-reinforced polymer (CFRP) ground anchors simulating their applications in rock and soil. The CFRP tendons used in these anchors comprise a single-strap end on both the ground and air sides. On the gr ...

2016

Pull-out behavior of CFRP ground anchors with two-strap ends

Thomas Keller, Anastasios Vassilopoulos, Haifeng Fan

Pull-out experiments were performed on three carbon fiber-reinforced polymer (CFRP) ground anchors simulating their applications in different rock types which provided different confinement levels. The CFRP tendons comprised, on the ground side, a prefabri ...

The Hong Kong Polytechnic University2016

The statistical variability and length effects in the tensile transverse behavior of clear timber

Thomas Keller, Anastasios Vassilopoulos, Alireza Farajzadeh Moshtaghin, Steffen Franke

In this work, clear timber specimens of different lengths with a small cross-sectional area were cut in the transverse direction of timber boards and tested under tensile loading. Regularly positioned and randomly positioned specimens were cut from differe ...

2016

Effect of Natural Weathering on Durability of Pultruded Glass Fiber-Reinforced Bridge and Building Structures

Julia De Castro San Roman Fest, Thomas Keller, Anastasios Vassilopoulos, Nikolaos Alexandros Theodorou

After 17 and 15years of use, respectively, a detailed inspection of a pedestrian bridge and a 5-story building structure composed of partly adhesively bonded pultruded glass fiber-reinforced polymer (GFRP) profiles was conducted accompanied by full-scale s ...

American Society of Civil Engineers2016

On the adequacy of standardized lightning current waveform for composite structures for aircraft and wind turbine blades

Farhad Rachidi-Haeri, Marcos Rubinstein, Anastasios Vassilopoulos, Aleksandr Smorgonskii

The standard lightning waveforms used for the testing of aircraft are based on downward lightning. However, there is evidence suggesting that lightning to aircraft is different from negative downward lightning. Also, carbon fiber composite materials are be ...

Ieee2016

Mixed-Mode I/II fracture behavior of asymmetric composite joints

Thomas Keller, Anastasios Vassilopoulos, Moslem Shahverdi

The partitioning of the total strain energy release rate, G(tot), into the Mode I, G(I), and Mode II, G(II), components is challenging, especially in asymmetric cracks. Although many researchers have studied the fracture behavior of composite materials und ...

Elsevier Science Bv2016

Random field-based modeling of size effect on the longitudinal tensile strength of clear timber

Thomas Keller, Anastasios Vassilopoulos, Alireza Farajzadeh Moshtaghin, Steffen Franke

In the current study, a random field-based size effect model has been proposed for the longitudinal tensile strength of clear timber. Since the failure mode is brittle, the problem is basically an extreme value problem of finding the distribution of minima ...

Elsevier2016

Post-wrinkling behavior of webs in GFRP cell-core sandwich structures

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

Similarly to the post-buckling behavior of steel girder webs, the post-wrinkling behavior of glass fiber reinforced polymer (GFRP) cell-core sandwich webs can increase their ultimate shear strength. Post wrinkling is, however, different from post-buckling ...

Elsevier2016

Analytical model of asymmetrical mixed-mode bending test of adhesively bonded GFRP joint

Anastasios Vassilopoulos, Moslem Shahverdi

This paper presents new analytical model of asymmetric mixed-mode bending (MMB) specimen of adhesively bonded pultruded GFRP joints. An easily applicable relationship for the calculation of the strain energy release rate of the asymmetric MMB specimens is ...

2015

Optically-derived mechanical properties of glass fiber-reinforced polymer laminates for multifunctional load-bearing structures

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

This paper demonstrates how the translucency of glass fiber-reinforced polymer (GFRP) laminates allows the derivation of their mechanical properties through optical measurements. Spectrophotometric, goniophotometric and tensile experiments were performed o ...

SAGE Publications2015

Time-dependent mechanical behavior of acrylic adhesives

Julia De Castro San Roman Fest, Thomas Keller, Anastasios Vassilopoulos, Myrsini Angelidi

2015

Experimental investigation of kink initiation and kink band formation in unidirectional glass fiber-reinforced polymer specimens

Thomas Keller, Anastasios Vassilopoulos, Wei Sun

The failure mechanism of non-slender glass fiber-reinforced epoxy prismatic specimens subjected to axial compression and different temperatures was investigated. Digital image correlation was used to map and derive the failure modes. The failure mode chang ...

Elsevier2015

Long-term behavior of cold-curing structural adhesives in aqueous and alkaline conditions

Thomas Keller, Anastasios Vassilopoulos, Maria Savvilotidou

2015

Spatial variability in longitudinal elastic modulus of clear timber

Thomas Keller, Anastasios Vassilopoulos, Alireza Farajzadeh Moshtaghin, Steffen Franke

Different factors such as age, location of timber within the tree, structural imperfections, load history such as wind and snow etc. can affect the material properties of timber taken from the same species, and grown in the same geographical location and l ...

2015

Analytical modeling of mixed-Mode bending behavior of asymmetric adhesively bonded pultruded GFRP joints

Anastasios Vassilopoulos, Moslem Shahverdi

This paper presents a semi-analytical methodology for the fracture mechanics assessment of asymmetric adhesively bonded composite joints. The method is based on the classical lamination theory, the simple beam theory and the extended global method. Experim ...

Elsevier2015

Analytical model of asymmetrical Mixed-Mode Bending test of adhesively bonded GFRP joint

Anastasios Vassilopoulos, Moslem Shahverdi

2015

Effect of temperature on kinking failure mode of non-slender glass fiber-reinforced polymer specimens

Thomas Keller, Anastasios Vassilopoulos, Wei Sun

The kink behavior of non-slender glass fiber-reinforced epoxy prismatic specimens of variable length and fiber volume fraction at temperatures ranging from 25 degrees C to 125 degrees C was investigated. Splitting failure occurred at the glassy state while ...

Elsevier2015

Physically Based Modeling of Shear Modulus-Temperature Relationship for Thermosets

Thomas Keller, Anastasios Vassilopoulos, Wei Sun

A new physically based model for the simulation of the imaginary part of the shear modulus-temperature (G ''-T) curve of thermosets is introduced in this paper. The model is based on the modification of the G ''-T equation used for thermoplastic polymers v ...

Wiley-Blackwell2015

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