Experimental investigation of particle filtration in compression resin transfer molding of advanced composites

Aydil Dalkıran, Tuğçe
With the inclusion of particle fillers in advanced continuous fiber reinforced composites, issues such as impregnation with increased viscosity of the injected resin leading to high process pressures and possible nonhomogeneous/directional composite properties due to filtering of filler particles necessitate the study of the relations between processing parameters and the resulting particle distributions. In this study, the particle-resin interaction during compression resin transfer molding (CRTM) and resin transfer molding (RTM) of particle filled advanced composites is experimentally investigated to propose particle filtration models that can predict composite microstructure. For this purpose an experimental set-up is developed and composite specimens are produced using RTM and CRTM processes for different fiber volume fractions and particle concentrations. The produced specimens are characterized to obtain particle filler distributions along the composites. A nearly constant particle distribution profile along the flow direction was found, indicating little filtration in RTM however in CRTM, particle content in composite increased towards the end of the flow length in composite. To model particle filled resin impregnation, a Darcy law-based porous flow model, coupled with particle filtration kinetics is adapted to RTM and CRTM processes. An appropriate commercial software tool, Comsol Multiphysics® version 4.3 is used for numerical implementation and solution. The filtration kinetics of the model is adjusted with respect to the experimental results by tuning the model parameters to match simulated particle filler distributions with experimental ones.


Design of Microstrip Quadruplet Filters on Filpro
Oruc, Sacid; Yıldırım, Nevzat (2018-11-02)
In this paper, a simple dimensional design procedure is developed for microstrip/stripline quadruplet filters by starting with direct BP synthesis of a lumped quadruplet with inverter couplings, K14, K12, K23 and K34. K14 is the cross-coupling inverter which creates a symmetric pair of finite transmission zeros (FTZ's) if the sign of K14 is opposite of the other inverters while a complex TZ is created if K14 has the same sign as the other inverters leading to linear phase (flat delay) responses. The LC reso...
Experimental Investigation of Particle-Filler Distribution in Continuous Fiber-Reinforced Composites Produced via Liquid Molding
Aydil, T.; Tanabi, H.; Erdal Erdoğmuş, Merve (2013-09-11)
This paper presents the preliminary results of an experimental study undertaken to investigate the particle distribution in particle-filled, continuous fiber-reinforced composites produced via two liquid molding methods: Resin Transfer Molding (RTM) and Compression Resin Transfer Molding (CRTM). Composite specimens are produced and characterized to compare composite microstructures (particle filler distributions) obtained in each method, as well as to study the effect of a processing parameter (injection sp...
Implementation and characterization of an absorption filter for on-chip fluorescent imaging
Yıldırım, Ender; Arpali, Serap Altay (2017-04-01)
Here we present fabrication and characterization of an absorption filter with superior roll-on properties and precisely tunable cut-off wavelengths for fluorescent imaging applications in lab-on-a-chip systems. The filters were fabricated by spinning dye doped photopolymer (Orasol Yellow in Norland Optical Adhesive 60) on glass substrates. The fabrication technique allowed us to precisely tune the cut-off wavelength of the filters. We showed that filters with different cut-off in the range of 386 nm-504 nm ...
Thermal degradation of polythiophene-natural rubber and polythiophene-synthetic rubber conducting polymer composites
Hacaloğlu, Jale; Akbulut, Ural; Toppare, Levent Kamil (1997-01-01)
Thermal degradation of conducting polymer composites of polythiophene and rubbers was studied by direct and indirect pyrolysis mass spectrometry techniques. The samples were prepared by electrooxidation of polythiophene using natural rubber or synthetic rubber as the insulating matrix. Presence of decomposition products which were not observed during pyrolysis of pure polythiophene and rubbers, and disappearance of rubber-based pyrolysis mass peaks, together with changes in thermal stability and behaviour, ...
Monitoring durability of new concrete bridge decks
Aktan, Haluk M.; Yaman, İsmail Özgür; Staton, John F. (2001-08-03)
The ND durability monitoring procedure, which measures the soundness of field concrete, is based on the fundamental relationship between ultrasonic pulse velocity (UPV) and permeability of an elastic medium. An experimental study documented adequate sensitivity between UPV and concrete permeability. The durability monitoring procedure is based on a parameter developed as part of this study and called paste quality loss (PQL) which is computed from the probability density function parameters of ultrasonic pu...
Citation Formats
T. Aydil Dalkıran, “Experimental investigation of particle filtration in compression resin transfer molding of advanced composites,” M.S. - Master of Science, Middle East Technical University, 2014.