Thomas Keller
École Polytechnique Fédérale de Lausanne
Composite numberUltimate tensile strengthGlass transitionEngineeringFinite element methodComposite materialEpoxyGlass fiberMaterials scienceGirderJoint (geology)DeckStiffnessFracture (geology)PolymerPultrusionFracture mechanicsStructural engineeringAdhesiveFibre-reinforced plasticForensic engineeringStress (mechanics)
332Publications
45H-index
4,885Citations
Publications 330
Newest
#1A. Movahedi-RadH-Index: 4
Last. Thomas KellerH-Index: 45
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#1A. Movahedi-Rad (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
#2Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
Last. Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
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The effect of load interruptions on the fatigue behavior of (±45)2s angle-ply glass/epoxy composite laminates was investigated in this work. Constant amplitude fatigue experiments were performed at different stress levels to derive base line fatigue data. In addition, interrupted-fatigue experiments were performed by removing the cyclic loading for two hours repetitively, after cycling for 20% of the fatigue life achieved under continuous loading at the same maximum cyclic stress level. The spec...
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
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The two-dimensional (2D) delamination behavior of composite laminates under quasi-static out-of-plane opening loads has been experimentally investigated. A novel design and experimental set-up for fiber-reinforced polymer (FRP) laminated plates with a circular embedded pre-crack was developed. Increasing load-displacement curves were obtained due to the increasing crack front length during propagation. Throughout the loading process, stiffening and softening mechanisms were activated. The stretc...
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#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
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The tension–tension fatigue behavior and damage mechanism of basalt fiber-reinforced epoxy polymer (BFRP) composites at different stress ratios are studied in this paper. The fatigue experiments were performed under stress ratios, R = σmin/σmax of 0.1 and 0.5, while the lifetime and the stiffness degradation were monitored and analyzed to investigate the effect of stress ratios. The damage propagation during fatigue loading was periodically monitored by using an in situ scanning electron microsc...
13 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
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Abstract The fatigue behavior of (±45) 2S angle-ply glass/epoxy composite laminates was investigated. Rectangular specimens were subjected to constant amplitude fatigue loading at different stress levels, with stress ratio 0.1 until failure. A video-extensometer and an infrared thermal camera were employed respectively to measure the evolution of strain and the self-generated temperature during the fatigue experiments. Using a digital camera and microscope, the progression of damage at the diffe...
25 CitationsSource
#1T. Morgado (IST: Instituto Superior Técnico)H-Index: 7
#2Nuno Silvestre (IST: Instituto Superior Técnico)H-Index: 44
Last. Thomas Keller (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
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Abstract This paper presents a numerical study about the thermal behaviour of pultruded GFRP profiles with square tubular cross-section exposed to fire. Two-dimensional and three-dimensional numerical models of previous fire tests of GFRP profiles were developed using the commercial software ANSYS Fluent 14.5. The efficacy of using different fire protection systems (passive and active) and the influence of the number of sides exposed to fire (one or three) in the thermal response of the GFRP pro...
7 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
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Abstract An investigation of the load-transfer mechanism in carbon fiber-reinforced polymer (CFRP) ground anchors with multi-strap ends was conducted based on experimental and numerical studies of one- and two-strap anchors. Differences in the strap geometry, i.e. different curvature distributions and transitions from the rod to the strap cross section, and different strap numbers only influenced the local load transfer from the straps to the grout, but not the global pull-out behavior. At highe...
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#1Moslem ShahverdiH-Index: 15
Last. Thomas KellerH-Index: 45
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#1Chao WuH-Index: 29
#2Niloufar VahediH-Index: 2
Last. Thomas KellerH-Index: 45
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Last. Thomas KellerH-Index: 45
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