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[article]
Titre : A further development of tube technology : New compact machines accelerate the spread of computed tomography Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 48-49 Langues : Anglais (eng) Catégories : Mesure -- Instruments
Objets en matières plastiques
ScanographieIndex. décimale : 668.4 Plastiques, vinyles Résumé : The latest generation of coordinate measuring machines for computed tomography (CT) applications costs less, is smaller and easier to use. That is why these machines are increasingly replacing conventional 3D measuring machines. Werth Messtechnik has introduced two compact machines with new software capable of measuring injection molded or extruded plastic parts both atline and inline in real-time. Note de contenu : - Inline measuring with high-performance X-ray tubes
- Time-saving multi-object high-resolution measurementEn ligne : https://drive.google.com/file/d/1d5PI9TfQtHoFqPyuVO5RMswhgsxoD_eC/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37713
in KUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 3 (2022) . - p. 48-49[article]Réservation
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Titre : Measuring at the limit : Special measuring methods extend the range of application for computed tomography Type de document : texte imprimé Auteurs : Schirin Heidai Bateni, Auteur Année de publication : 2020 Article en page(s) : p. 31-34 Langues : Anglais (eng) Catégories : Matières plastiques -- Pièces
Mesure
Objets en matières plastiques
Scanographie
TomographieIndex. décimale : 668.4 Plastiques, vinyles Résumé : The requirements of measurement technology vary depending on the measurement task. In addition to the need for high accuracy or short measuring time, the computed tomography sensor also requires the measurability of objects that are difficult to penetrate with X-rays like multi-material workpieces. Different measurement methods are available for such applications. Note de contenu : - Model, measurement result, and deviations displayed
- Wide measuring range and high resolution
- High-resolution areas with multi-ROI-CT
- High density samples and multi-material objects
- Measurements every second
- Figure : The OnTheFly-CT enables in line measurement and evaluation in the production cycle by saving the dead times for positioning the sample occuring in the conventional start/stop process
- Fig. 1 : In the cone beam between the X-ray source and the detector, the sample is penetrated in different rotational positions
- Fig. 2 : Calculating volume data by back projection of filtered radiographic images: a) object ; b) X-ray beam path in one section plane; c) principle of stepwise back projection and superimposing ; d) result of reconstruction with different numbers of back projections for a real sample
- Fig. 3 : Measuring principles : a) eccentric CT : as the rotary table rotates around its own axis (1), it is simultaneously moved by an X-Y stage along a circular path (2) around the center (3) of the sample. A virtual axis of rotation result at (3) ; b) overview CT ; c) ROI-CT : zone at the center of the sample ; d) Multi-ROI-CT : the principle of eccentric CT is used here to tomographically scan several areas e) measurement result of the high-resolution region
- Fig. 4 : Two-spectrum tomography can also be used to measure multi-material samples with high accuracy. Here the different materials of a motorcycle helmet are shown in blue and red, a cross section with measured geometric properties in blackEn ligne : https://drive.google.com/file/d/1Os6oG-XyBEVBigmiy4bwluxSwVHlZ1qV/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34072
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 3 (2020) . - p. 31-34[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21649 - Périodique Bibliothèque principale Documentaires Disponible Non-destructive series testing of large fiber-reinforced components / Thomas Baranowski in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 3 (2020)
[article]
Titre : Non-destructive series testing of large fiber-reinforced components : "Region of interest" (ROI) computed tomography for local analysis of the fiber orientation without sampling Type de document : texte imprimé Auteurs : Thomas Baranowski, Auteur ; Dascha Dobrovolskij, Auteur ; Kilian Dremel, Auteur ; Astrid Hölzing, Auteur ; Günter W. Lohfink, Auteur ; Katja Schladitz, Auteur ; Simon Zabler, Auteur Année de publication : 2020 Article en page(s) : p. 46-49 Langues : Anglais (eng) Catégories : Composites à fibres
Contrôle non destructif
Distribution et orientation des fibres
Qualité -- Contrôle
Scanographie
TomographieIndex. décimale : 668.4 Plastiques, vinyles Résumé : The local fiber orientation in composite materials can be analyzed non-destructively using microcomputed ‧tomography. In practice, however, usually small samples are taken from larger components in order to avoid imaging errors. However, the ROI method allows parts of a size relevant to practice to be analyzed directly. Note de contenu : - FRP part from a car engine compartment
- Local fiber-orientation analysis
- Comparison with flow simulation
- Figure : The (halved) front carrier from an auto engine compartment used for elucidating the measurement method, with four region of interest marked with crosses.
- Fig. 1 : Volume rendering of the region marked green in the Title figure and cross-sections from the 3D images of region of interest A3 with highest and lowest resolution
- Fig. 2 : Diagonal components of the 2nd order orientation tensor measured from the CT images. Sections through the 3D images in the xz-direction in the coordinate system from Figure 2 are shown (y : injection direction, z: thickness direction)
- Fig. 3 : Diagonal components of the 2nd order orientation tensor, comparison of the orientation predicted by injection molding simulation (orange) and the orientation measured in the 3D images with highest resolution (green).The position of the regions used in the simulation is marked red in the volume rendering
- Table 1 : Diagonal components of the 2nd order orientation tensor, measured in 3D images of the region of interest with different resolutionsEn ligne : https://drive.google.com/file/d/1Qt2OsigroPVdfuRk4dR54qadLtXIiryK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34076
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 3 (2020) . - p. 46-49[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21649 - Périodique Bibliothèque principale Documentaires Disponible Second life for carbon fibers / Holger Fischer in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 12 (12/2019)
[article]
Titre : Second life for carbon fibers : Re-Use of recycled carbon fibers in sophisticated composite parts Type de document : texte imprimé Auteurs : Holger Fischer, Auteur ; Andrea Miene, Auteur ; Katharina Hellos, Auteur ; Marcel Hofmann, Auteur Année de publication : 2019 Article en page(s) : p. 46-49 Langues : Anglais (eng) Catégories : Cardage Avant de pouvoir être filée, une fibre naturelle doit être cardée ou peignée, en fonction du matériau et du résultat souhaité. Le cardage consiste à démêler et aérer les fibres textiles à partir de divers matériaux bruts.
Le cardage s'effectue avec une paire de cardes à main, ou une cardeuse à rouleau, et l'on obtient un rouleau avec les cardes à main, ou une nappe avec la cardeuse.
On carde généralement les fibres courtes (mérinos, coton).
C'est lors du cardage (ou du peignage) que l'on peut faire des mélanges de matières et de couleurs. Il peut être intéressant par exemple, de mélanger du mohair avec de la laine afin de conserver l'élasticité de la laine et la brillance du mohair.
Composites à fibres de carbone -- Recyclage
Essais dynamiques
Fibres de carbone -- Recyclage
Matériaux -- Imprégnation
Nontissés
Nontissés -- Propriétés mécaniques
Résistance à la traction
ScanographieIndex. décimale : 668.4 Plastiques, vinyles Résumé : Carbon fibers are due to their high price interesting for recycling. The results of the project RecyCarb ‧enable the multiple use of carbon fibers as functional re-use. First demonstrator parts in the areas of medical technology and automotive prove the industrial feasibility. Note de contenu : - Capacity for recycling of CFRP
- Analytical scheme and parameters measured
- Production of nonwovens and composites
- Results of the examination
- Process suitable for industrial use
- Qualified value-added chain for carbon fibers
- Figure : Plant for carbon at STFI with guilloting cutting machine, tearing machine, feeder chute, airlay, card, cross-lapper, needle loom and Maliwatt unit
- Fig. 1 : Overview of the sampling positions in the carding process : the on-line control is at card supply, after carding and on the needle felt
- Fig. 2 : Comparison of the tensile strength of composites made of carded rCF nonwovens (MD = machine direction, CD = cross direction)
- Fig. 3 : Examination table for computer tomography made of rCF nonwovens : virgin carbon tapes and carbon non-crimp fabrics have been substituted by rCF nonwovens
- Fig. 4 : In the inner part of the rear spoiler rCF prepreg has been used. It consists of approx. 65% recycled carbon fibers
- Table 1 : Comparison tensile strength vs. offline image analysis for rCF ande rrCF compositeEn ligne : https://drive.google.com/file/d/1ibWFnhrCa8fTVl1JXp_U_YO_3k0p1R2n/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33720
in KUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 12 (12/2019) . - p. 46-49[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21401 - Périodique Bibliothèque principale Documentaires Disponible X-ray computed tomography for assessment of mechanical properties and monitoring damage / Abderrahmane Ayadi in JEC COMPOSITES MAGAZINE, N° 113 (06/2017)
[article]
Titre : X-ray computed tomography for assessment of mechanical properties and monitoring damage Type de document : texte imprimé Auteurs : Abderrahmane Ayadi, Auteur ; Hedi Nouri, Auteur ; Frédéric Roger, Auteur ; Habibou Matournam, Auteur Année de publication : 2017 Article en page(s) : p. 63-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de dommages (matériaux)
Analyse quantitative (chimie)
Composites à fibres de verre -- Propriétés mécaniques
Eléments finis, Méthode des
Essais dynamiques
Mécanique analytique
Scanographie
Traction (mécanique)Index. décimale : 668.4 Plastiques, vinyles Résumé : A coupled experimental and numerical approach was developed to overcome the limits of integrative simulation methods in the case of short glass fibre-reinforced thermoplastics. On the one hand, laboratory X-ray computed tomograhy and finite element modelling were combined to assess local mechanical properties in strongly anisotropic zones where weld lines potentially form. On the other hand, an original experimental protocol was developed to monitor damage evolution during continuous tensile loading. The experimental results open new perspectives to formulate more physically based local damage criteria. Note de contenu : - Material and semi-structural samples
- Assessment of mechanical properties in an opposing flow weld line
- Mapping volume strain distribution in an adjacent flow weld line : combining helical µCT and full-scale FEM
- Quantitative analysis of damage kinetics based on in-situ tests
- FIGURES : 1. Schematic representation of the suggested approach based on experimental X-ray characterisation of zones where injection moulding packages may lack precision - 2. Overview of the multi-scale finite-element homogenization procedure ; characteristic element sizes are provided in appropriate (ength units) - 3. Sample analysis-using the helical µCT detection mode - 4. Quantitative evaluation of surface damage-based on SEM (in-situ discontinuous tensile tests - 5. SR-µ observations of local damage initiation and observation in a PA66GF35 samples ; b) damage evolution law for the same analyzed sampleEn ligne : https://drive.google.com/file/d/1fnx7zOaKPYRRJuOBXUPLV1h_lt707_fa/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28779
in JEC COMPOSITES MAGAZINE > N° 113 (06/2017) . - p. 63-66[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19023 - Périodique Bibliothèque principale Documentaires Disponible