A5076664118- Polymer Foaming and Composites
- Polymer composites and self-healing
- Mechanical Behavior of Composites
- Epoxy Resin Curing Processes
- Cellular and Composite Structures
- Force Microscopy Techniques and Applications
- Electromagnetic Compatibility and Measurements
- Polymer crystallization and properties
- Nanoporous metals and alloys
- Electromagnetic wave absorption materials
- Rheology and Fluid Dynamics Studies
- Advanced Antenna and Metasurface Technologies
- Composite Material Mechanics
- Aluminum Alloys Composites Properties
- Innovative Energy Harvesting Technologies
- Injection Molding Process and Properties
- Diamond and Carbon-based Materials Research
- Fatigue and fracture mechanics
- Nonlinear Optical Materials Studies
- Electronic Packaging and Soldering Technologies
- Advanced ceramic materials synthesis
- Silicone and Siloxane Chemistry
- Metallic Glasses and Amorphous Alloys
- Advanced Sensor and Energy Harvesting Materials
- Material Properties and Processing
Eindhoven University of Technology
2023-2025
UCLouvain
2020-2023
University of Cambridge
2018-2019
Delft University of Technology
2016
Technische Universität Braunschweig
1993
Volkswagen Group (Germany)
1993
Amorphous alumina is hard but brittle like all ceramic type materials which affects durability under impact or scratch. Here we show that layers below 100 nm thickness when stacked with aluminum interlayers exhibit exceptional performances including toughness equal to 300 J.m−2 determined by on chip nanomechanics. This almost two orders of magnitude higher than bulk and any other thin coatings. In addition, a hardness above 8 GPa combines fracture strain 5%. The origin this superior set...
Uniaxial tensile tests are performed on a polymethyl methacrylate (PMMA) grade over range of temperatures near the glass transition and two decades strain rate. Deformation maps constructed for Young's modulus, flow strength, failure as function temperature selected rates. The glassy, rubbery regimes identified, constitutive relations calibrated modulus strength within each regime.
Bimodal cellular poly(methyl methacrylate) with micron and nano sized (300 to 500 nm) cells up 5 weight percent of sepiolite nanoparticles porosity from 50 75 are produced by solid state foaming. Uniaxial compression tests performed measure the effect concentration on elastic modulus yield strength nanocomposites. Single edge notch bend conducted relate fracture toughness nanocomposites concentration. The relative is independent content within material scatter when considering complete...
A three-dimensional numerical model is constructed to predict the EMI shielding performance of a polymer nanocomposite shield in rectangular waveguide. The Helmholtz wave equation for electric field implemented component form and set coupled equations solved via finite element approach. Mesh convergence verification performed by comparing free space predictions flat, uniform layer benchmark solutions calculated transfer matrix theory. capability showcased exploring role geometry on...
Tremendous progress in nanomechanical testing and modelling has been made during the last two decades. This emerged from different areas of materials science dealing with mechanical behaviour thin films coatings, polymer blends, nanomaterials or microstructure constituents as well rapidly growing field MEMS. Nanomechanical test methods include, among others, nanoindentation, in-situ a scanning transmission electron microscope coupled digital image correlation, atomic force microscopy new...
The active and passive piezoelectric response of lead zirconium titanate (PZT)-epoxy particulate composites loaded in shear is studied using analytical models, a finite element model by experiments. compared to that the same when simple tension. Analogously bulk PZT, PZT-polymer show higher charge coefficient (d15) energy density figure merit (FOM15) values tension (d33) (FOM33). This outcome demonstrates as-yet barely explored potential for optimal strain harvesting activated shear.
Control of the in-situ polymerization thick methacrylic laminates is essential to minimize cavitation due monomer boiling. To this end, a computationally efficient thermochemical model developed predict temperature and degree conversion during methyl methacrylate (MMA)-based resin in fibrous preform. The couples self-accelerating exothermic free-radical bulk MMA (gel effect) with heat transfer within preform environment. predicted profiles are excellent agreement experimental data measured...
Abstract The Young’s modulus and fracture strength of single bilayer graphene (BLGr) grown by chemical vapour deposition (CVD) were determined using atomic force microscopy-based membrane deflection experiments. uncertainty resulting from instrument calibration the errors due to experimental conditions like tip wear, loading position, sample preparation investigated estimate accuracy method. theoretical estimation on linked is around 16%. Finite element simulations performed determine...
High-performance polymers are extensively used in various applications undergoing long-term cyclic loadings.The deformation behaviour of an amorphous thermoset epoxy resin compressive loading is investigated for a range applied levels.The measurements indicate significant hysteresis upon repeated and unloading cycles with progressive accumulation plastic strain.Cyclic damage leads to reduction the stress needed reach peak strain per cycle, while stiffening corresponding increase elastic...
Solid-state nanofoaming experiments are conducted on two polymethyl methacrylate (PMMA) grades of markedly different molecular weight using CO 2 as the blowing agent. The sensitivity porosity to foaming time and temperature is measured. Also, microstructure PMMA nanofoams characterized in terms cell size nucleation density. A one-dimensional numerical model developed predict growth spherical, gas-filled voids during solid-state process. Diffusion within matrix sufficiently rapid for...
Solid-state nanofoaming experiments are conducted on two PMMA grades of markedly different molecular weight using CO2 as the blowing agent. The sensitivity porosity to foaming time and temperature is measured. Also, microstructure nanofoams characterized in terms cell size nucleation density. A one-dimensional numerical model developed predict growth spherical, gas-filled voids during solid-state process. Diffusion within matrix sufficiently rapid for concentration remain almost uniform...
Solid-state nanofoaming experiments are conducted on two polymethyl methacrylate (PMMA) grades of markedly different molecular weight using CO2 as the blowing agent. The sensitivity porosity to foaming time and temperature is measured. Also, microstructure PMMA nanofoams characterized in terms cell size nucleation density. A one-dimensional numerical model developed predict growth spherical, gas-filled voids during solid-state process. Diffusion within matrix sufficiently rapid for...
Solid-state foaming experiments are conducted on three grades of polymethyl methacrylate (PMMA). Nanocellular PMMA foams manufactured with an average cell size ranging from 20 nm to 84 and a relative density between 0.37 0.5. For benchmarking purposes, additional microcellular close 1 ìm that the nanocellular manufactured. Uniaxial compression tests single edge notch bend foams. The measured Young's modulus yield strength independent whereas fracture toughness foam increases decreasing...
A computationally efficient thermochemical model is used to predict thermal runaway and the occurrence of monomer boiling during in-situ polymerization a methyl methacrylate (MMA)-based resin within thick glass fiber layup. The framework couples auto-accelerating exothermic free-radical bulk MMA with transfer heat system environment. Three approaches are considered for kinetic treatment auto-acceleration: (1) an empirical model, (2) semi-empirical (3) analytical model. Predictions made via...