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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Maoult, Yannick Le
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (37/37 displayed)
- 2022Numerical Simulation of Recycled PET Preforms Infrared Heating Including Force Convection Effect in the Industrial ISBM Ovens
- 2022Infrared heating modeling of recycled PET preforms in injection stretch blow molding processcitations
- 2021Effect of oxidation on spectral and integrated emissivity of Ti-6Al-4V alloy at high temperaturescitations
- 2018On the thermal sensitivity and resolution of a YSZ:Er 3+ /YSZ:Eu 3+ fluorescent thermal history sensorcitations
- 2018The role of microcrystalline structure on optical scattering characteristics of semi-crystalline thermoplastics and the accuracy of numerical input for IR-heating modelingcitations
- 2017A non-invasive experimental approach for surface temperature measurements on semi-crystalline thermoplasticscitations
- 2017Industrial applications of the superplastic forming by using Infra-Red heatercitations
- 2017Novel erbia-yttria co-doped zirconia fluorescent thermal history sensorcitations
- 2016Experimental analysis on the coupled effect between thermo-optical properties and microstructure of semi-crystalline thermoplasticscitations
- 2016Infrared welding process on composite: Effect of interdiffusion at the welding interfacecitations
- 2016Infrared radiation applied to polymer processescitations
- 2016Titanium Superplastic Forming by Aurock: A Complete Integrated Solution from CAD File to Final Part
- 2016Identification of the temperature dependent relation between thermo-optical properties and morphology of semi-crystalline thermoplastics for thermoforming process
- 2016Effect of the developed temperature field on the molecular interdiffusion at the interface in infrared welding of polycarbonate compositescitations
- 2016Infrared Radiation applied to Blow Molding and thermoforming
- 2014Optimized sol–gel thermal barrier coatings for long-term cyclic oxidation lifecitations
- 2014Feasibility of luminescent multilayer sol-gel thermal barrier coating manufacturing for future applications in through-thickness temperature gradient sensingcitations
- 2013Innovative Superplastic Forming Based on In-Situ Infra-Red Sheet Heatingcitations
- 2012Superplastic forming of AZ31 magnesium alloy with controlled microstructurecitations
- 2011Infrared heating stage simulation of semi-transparent media (PET) using ray tracing methodcitations
- 2011Simulations of an Infrared Composite Curing Processcitations
- 2011Infrared curing simulations of liquid composites moldingcitations
- 2010Oxidation and spallation of FeCrAl alloys and thermal barrier coatings: in situ investigation under controlled temperature gradientcitations
- 2010Evolution de la microstructure et influence de la pollution atmosphérique lors de la mise en oeuvre d'une résine thermodurcissable
- 2010Advances in the field of new smart thermal barrier coatings
- 2008Direct obervations and analysis of the spallation of alumina scales grown on PM2000 alloycitations
- 2008TOWARDS SUPERPLASTIC FORMING OF AZ31 MAGNESIUM ALLOY WITH CONTROLLED MICROSTRUCTURE
- 2007Measurement of thermal contact resistance between the mold and the polymer for the stretch-blow molding processcitations
- 2004Experimental and numerical infrared heating of thermoplastic sheet during thermoforming process
- 20043D finite element modeling of the blow molding process
- 2003Heat conditioning modelling of thermoforming process: comparison with experiments
- 2003Modelling of infrared heating of thermoplastic sheet used in thermoforming processcitations
- 2002Infrared Heating Modeling of Thermoplastic Sheets in Thermoforming Process
- 2001Comparison between a numerical model and an experimental approach of preform infrared radiative heating-recent results
- 2001Recent Issues In Preform Radiative Heating Modelling
- 2001Comparison Between a Numerical Model and an Experimental Approach of Preform Infrared Radiative Heating – Recent Results
- 2000Analysis of influent parameters during infrared radiative heating of PET preform
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article
The role of microcrystalline structure on optical scattering characteristics of semi-crystalline thermoplastics and the accuracy of numerical input for IR-heating modeling
Abstract
Infrared (IR) heating is widely used for thermoforming of thermoplastic polymers. The key benefit of radiation heating is that a significant amount of the radiative energy penetrates into the polymers thanks to their semi-transparency. For the case of heating unfilled semi-crystalline polymers, the relation between their microcrystalline structure and optical properties is the key to develop a predictive IR-heating model as microcrystalline structure introduces an optically heterogeneous medium. In this study, a relation between the microcrystalline structure of a polyethylene (PE) and its effect on the thermo-optical properties was experimentally analyzed considering a two-step analysis. At very first step, the relation was analyzed considering samples with identical thicknesses and different morphologies, characterized here in terms of degree of crystallinity (Xc (%)). Using Fourier Transform Infrared (FT-IR) spectroscopy and integrating sphere, optical characteristics of the PE samples were analyzed in near-infrared (NIR) and middle-infrared (MIR) spectral ranges. The analyses showed that a slight variation in Xc (%) has a great effect on the optical characteristics of PE, particularly the transmission characteristics in NIR range. The wavelength-dependent effect of Xc (%) on the transmission behaviors opened a discussion about the fact that the microcrystalline structures -in particular spherulites or their substructures such as lamellae- are responsible for optical scattering. Using the optical properties obtained from the two-step experimental analyses, two different thermo-optical properties were calculated, namely extinction and absorption coefficients, and used as a numerical input for the parametric numerical studies. The numerical studies were performed using an in-house developed radiation heat transfer algorithm -RAYHEAT-. Both the experimental and numerical analyses demonstrated the importance of the optical scattering regarding the identification of thermo-optical properties, used as a numerical input for radiation heat transfer models.