Anastasios P. Vassilopoulos
École Polytechnique Fédérale de Lausanne
Composite numberUltimate tensile strengthGlass transitionEngineeringFinite element methodComposite laminatesComposite materialEpoxyGlass fiberMaterials scienceStiffnessStrain energy release rateFracture (geology)PolymerPultrusionFracture mechanicsStructural engineeringAdhesiveFibre-reinforced plasticStress (mechanics)
174Publications
28H-index
2,360Citations
Publications 169
Newest
#1Xing Zhao (SEU: Southeast University)H-Index: 5
#2Xin Wang (SEU: Southeast University)H-Index: 21
Last. Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
view all 5 authors...
9 CitationsSource
#1Aida Cameselle-Molares (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
#2Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
view all 3 authors...
Abstract The two-dimensional (2D) debonding behavior of GFRP/balsa sandwich panels presenting embedded circular disbonds at the face sheet/core interface was experimentally investigated. The bottom of the panels was fixed and out-of-plane quasi-static tensile loads were applied to open the crack. Two different face sheet configurations were studied. The first consisted of a pure woven ply layup while in the second, layers of continuous filament mat (CFM) were placed above and below the woven pli...
1 CitationsSource
#1Aida Cameselle-Molares (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
#2Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
view all 5 authors...
Abstract A new numerically-based method suitable for determining the total strain energy release rate (SERR) involved in two-dimensional (2D) Mode I-dominated delamination under opening loads in FRP laminates is presented. The method is based on the mutual dependence of the load vs opening displacement curves slope exhibited after the full development of the fracture process zone (FPZ) and the total SERR involved in the delamination process. The equation relating these parameters is derived from...
1 CitationsSource
#2Alexander Smorgonskiy (University of Applied Sciences Western Switzerland)H-Index: 7
Last. Farhad Rachidi (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 56
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Lightning strikes pose a serious natural threat to carbon fiber-reinforced polymers (CFRPs). Knowledge of the electrical current distribution is essential for modeling the interaction between CFRP with lightning. In most applications, the anisotropy of CFRP makes the electrical current tend to concentrate on the surface, having significant influence on the current distribution. The conductivity through the thickness direction was studied with pulse generators and a dedicated four-probe fixture. ...
Source
#1Wei Sun (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 19
#1Wei Sun (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 12
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
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Abstract The compressive kinking behavior of non-slender unidirectional glass fiber-reinforced polymer (GFRP) specimens has been analyzed by finite element (FE) models. The experimentally observed imperfections, including the initial fiber waviness throughout the entire specimen volume and the scattered resin/interface defects, were taken into account in the FE models. The birth-and-death method was employed to simulate the progressive damage to the material. The consideration of the coexistence...
1 CitationsSource
#1Aida Cameselle-Molares (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
#2Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
view all 3 authors...
Abstract The 2D delamination behavior of composite laminates under quasi-static out-of-plane opening loading has been experimentally investigated. A circular embedded pre-crack was introduced in the center and at the midplane of the laminates. To investigate the effect of the fiber architecture on the fracture behavior, six different types of fabrics were selected. Increasing load–displacement curves were obtained due to the increasing crack front length during propagation. During the loading pr...
6 CitationsSource
#1Aida Cameselle-Molares (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
#2Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
view all 5 authors...
Abstract A numerical investigation was carried out in order to simulate experimental results previously obtained concerning two-dimensional (2D) in-plane crack propagation in laminated glass fiber-reinforced polymer (GFRP) plates. The laminated plates were designed with an embedded circular pre-crack and subjected to quasi-static out-of-plane loads. In order to study the transition from standard fracture mechanics tests, where the crack propagates only in one dimension (1D), to 2D scenarios, add...
6 CitationsSource
#1Haifeng Fan (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
#2Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
view all 3 authors...
Abstract The tensile behavior of non-laminated and laminated CFRP straps composed of up to 100 layers was numerically and analytically investigated. The failure mode in non-laminated straps changed at 20–30 layers from brittle and sudden rupture of the outermost layer to progressive rupture starting from the innermost layer, due to the different non-uniform strain distributions across the layers. Non-laminated straps showed a significantly higher load-bearing efficiency for layer numbers higher ...
1 CitationsSource
#1Myrsini Angelidi (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 3
#2Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
view all 3 authors...
Abstract In the field of timber load-bearing structures, adhesive bonding is a promising joining technique that may increase the structural stiffness and capacity of timber joints and structures. The use of ductile adhesives may furthermore allow designing ductile joints, which can compensate for the material ductility that timber lacks. To demonstrate the potential of this approach, adhesively-bonded double-lap timber joints were manufactured using a ductile acrylic adhesive and then subjected ...
6 CitationsSource
#1A. Vahid Movahedi-Rad (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 5
#2Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
Last. Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
view all 3 authors...
Abstract The effect of load interruptions on the tension-tension fatigue behavior of angle-ply (±45)2S glass/epoxy composite laminates was investigated. The cyclic loading was interrupted for two hours at regular cycle intervals, corresponding to 20% of the fatigue life under continuous loading at the same maximum cyclic stress level. Fatigue stiffness was partially restored after each loading interruption due to the recovery of the viscoelastic polymeric matrix. This repeated material stiffenin...
10 CitationsSource