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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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Almeida, Olivier De
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2022Determination of a degradation-induced limit for the consolidation of CF/PEEK composites using a thermo-kinetic viscosity modelcitations
- 2021Effect of PEEK degradation on commingled fabrics consolidation
- 2021Effect of melt spinning on the integrity of poly(ether ether ketone) for commingled yarn based composite preformscitations
- 2021Effect of poly(ether ether ketone) degradation on commingled fabrics consolidationcitations
- 2020Characterisation and modelling of the temperature and rate dependent shear behaviour of a non-consolidated powder impregnated fabric
- 2019Experimental characterization and modeling of the temperature and rate-dependent shear behaviour of powder-impregnated glass fiber/PA66 woven semipregscitations
- 2019Modelling strategy of IR lamps with integrated reflector used in the manufacturing processof thermoplastic composite tapes
- 2019Pixel Coloring modelling of PEKK crystallization
- 2019Modeling of IR lamps with coated reflector used in the slurry powder impregnation process of composite tapescitations
- 2018The role of microcrystalline structure on optical scattering characteristics of semi-crystalline thermoplastics and the accuracy of numerical input for IR-heating modelingcitations
- 2017Experimental study of polymerization and crystallization kinetics of polyamide 6 obtained by anionic ring opening polymerization of ε-caprolactamcitations
- 2017Towards a coupled heating-forming simulation of the thermoforming of thermoplastic compositescitations
- 2017Long term ageing of polyamide 6 and polyamide 6 reinforced with 30% of glass fibers: physicochemical, mechanical and morphological characterizationcitations
- 2017A non-invasive experimental approach for surface temperature measurements on semi-crystalline thermoplasticscitations
- 2016Assessment of induction heated mould technologies for high-temperature thermoplastic composite manufacturing
- 2016Experimental analysis on the coupled effect between thermo-optical properties and microstructure of semi-crystalline thermoplasticscitations
- 2016Coupled heating-forming simulation of the thermoforming of thermoplastic composites
- 2016Identification of the temperature dependent relation between thermo-optical properties and morphology of semi-crystalline thermoplastics for thermoforming process
- 2010Melt state behaviour of PEEK and processing window interpretation for fast compression moulding process
- 2010Heterogeneous tensile behavior of impact-modified polypropylene plates processed by injection moulding
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document
Heterogeneous tensile behavior of impact-modified polypropylene plates processed by injection moulding
Abstract
Due to the fast cooling of polymer on the mould surface, the injection moulding process is known to be responsible of property gradients through thickness. Nevertheless, the mechanical behaviour is usually characterized by considering an homogeneous polymer, even when tensile test specimens processed by injection moulding are used. In order to characterize the local three-dimensional behaviour, a new set up based on digital image correlation has been developed and applied to specimens machined from injection moulded plates. This experimental set up allows to measure the strain fields on both front and lateral sides of specimens with a good accuracy. In this study, two impact modified polypropylenes have been analyzed under tensile loading. These polymers are made of ethylene-propylene rubber nodules and lamellar talc particles embedded in a polypropylene matrix. They differ from the volumetric amount of talc (4% in material A, 0,5% in material B). Unlike neat polypropylene, these materials do not exhibit a necking phenomenon in tension. The axial strain and transverse strain through specimen width remain homogeneous along the gauge length during the tensile test. On the other hand, the transverse strains through thickness differ for both polymers. Polymer B exhibits large gradients of εzz strain between the centre and the plate surfaces while polymer A presents an homogeneous transverse deformation. As confirmed by microstructure investigation, these results reveal a large volumetric dilatation due to void growth for both polymers, but for polymer B, the large transverse gradient measured is due to a high volumetric dilatation gradient through plate thickness. The good thermal conductivity of talc could explain the different behaviour between the two polymers and the origin of volumetric dilatation gradient. In polymer B, the different cooling rates between plate core and surfaces induce large residual stresses which could create damage and initiate voids in plate core.