Influences on the mechanical properties of SRCs in a combined compacting and back injecting process / Fabian Jakob in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 2 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 2 (2022) . - p. 141-151 Titre : Influences on the mechanical properties of SRCs in a combined compacting and back injecting process Type de document : texte imprimé Auteurs : Fabian Jakob, Auteur ; Joshua Pollmeier, Auteur ; Hans-Peter Heim, Auteur Année de publication : 2022 Article en page(s) : p. 141-151 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Compactage à chaud Composites -- Propriétés mécaniques Composites thermoplastiques auto-renforcés Essais dynamiques Flexion (mécanique) Mesure Polypropylène Rétro-injection Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : In this research paper, the effects of the combined compacting and back-injection process to produce back-injected self-reinforced composites on the mechanical properties of the self-reinforced composites (SRCs) are investigated. For this purpose, the parameters barrel temperature, time of injection and holding pressure were varied for the back injection. Tensile and bending tests were carried out on the SRCs. The results show that the mechanical properties depend to a large extent on the process parameters. The measured tensile strength varies between approx. 186 and 86 MPa, the stiffness between approx. 3500 and 2000 MPa. The flexural strength is measured between approx. 75 and 5 MPa, the flexural modulus between approx. 5480 and 650 MPa. Flexural tests are more suitable for evaluation of the consolidation, as tensile tests cannot evaluate the adhesion of the fabric layers to each other in the SRCs. Microscopic examinations show that consolidation by the back-injected melt can lead to smaller cross-sections in the SRCs compared to an area that was not back-injected. At high barrel temperatures, melting of individual fabric layers can occur, which explains, among other things, the drop in the mechanical properties of the SRCs. Note de contenu : - EXPERIMENTAL STUDIES : Materials - Processing - Preparation - Measuring - RESULTS AND DISCUSSION : Tensile tests - Bending tests - Microscopy DOI : https://doi.org/10.1515/ipp-2021-4151 En ligne : https://drive.google.com/file/d/1kkSXyPEQ78nK8yPu9mf1D0xVuvl1oXSm/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37620 [article]

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Investigation of the adhesive strength in a combined compaction and back-injection process to produce back-injected self-reinforced composites (SRCs) / Fabian Jakob in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 2 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 2 (2022) . - p. 200-209 Titre : Investigation of the adhesive strength in a combined compaction and back-injection process to produce back-injected self-reinforced composites (SRCs) Type de document : texte imprimé Auteurs : Fabian Jakob, Auteur ; Marcel Gothe, Auteur ; Fabian Gansiniec, Auteur ; Hans-Peter Heim, Auteur Année de publication : 2022 Article en page(s) : p. 200-209 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Compactage Composites thermoplastiques auto-renforcés Polypropylène Rétro-injection Index. décimale : 668.4 Plastiques, vinyles Résumé : This publication investigates the adhesion between an injection molded component and a self-reinforced composite (SRC) produced in a combined compaction and back-injection process to produce back-injected self-reinforced composites. To study the influence of the process, the parameters barrel temperature, time of injection, and tool temperature were varied. In addition, samples were taken at different positions along the flow path. In light of the orthotropic material behavior of SRCs, investigations were conducted to see whether different loading cases lead to different mechanical behavior. Shear-off and pull-off tests revealed a different strength as a function of the loading type. In the shear-off tests, a mean strength of 11.37 MPa was recorded over the entire test series, while the measured mean strength in the pull-off tests is considerably lower, 4.04 MPa. The type of failure is determined with the aid of SEM images, and the influence of the microstructure of the thermoplastic fibre materials on the adhesion is set out. It is shown that, as of a sufficiently high level of adhesion, failure occurs within the fibres. Note de contenu : - EXPERIMENTAL STUDIES : Materials - Processing - Preparation - Measuring - RESULTS AND DISCUSSION : Shear-off tests - Pull-off tests - Microscopic observations - Table 1 : Experimental setup for shear-off and pull-off tests DOI : https://doi.org/10.1515/ipp-2022-4205 En ligne : https://drive.google.com/file/d/13SX3M3UiFk-GU9y31gFAp-u48kddODJ5/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37625 [article]

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Process influences in the combined compacting and back-injection process to produce back-injected self-reinforced composites (SRCS) – analysis via multiple regression modelling / F. Jakob in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 5 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 5 (2021) . - p. 608-619 Titre : Process influences in the combined compacting and back-injection process to produce back-injected self-reinforced composites (SRCS) – analysis via multiple regression modelling Type de document : texte imprimé Auteurs : F. Jakob, Auteur ; Joshua Pollmeier, Auteur ; Hans-Peter Heim, Auteur Année de publication : 2021 Article en page(s) : p. 608-619 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Cisaillement (mécanique) Compactage Composites thermoplastiques auto-renforcés Essais (technologie) Polypropylène Rétro-injection Index. décimale : 668.4 Plastiques, vinyles Résumé : A new process to produce back-injected self-reinforced composites (SRCs) is presented. In contrast to other investigations on back-injection of SRCs, a process is presented which allows compacting and back injection of SRCs in one step where the SRCs are partly consolidated only via melt pressure inside the cavity. The mechanical properties of SRCs depend to a large extent on the process parameters of temperature and pressure during manufacture. These parameters are not yet known for back-injected areas. Sensors inside of the cavity measure the influences on the temperature and pressure conditions in the cavity. Initial studies on adhesion were carried out and analysed. For this purpose, shear tests of the back-injected component were carried out and a maximum shear strength of 5.81 MPa was determined for the materials used here. The investigations also show a dependence on the Distance from the Gate (DG) and the Mass temperature (TM). First microscopic examinations show good bonding between the SRC and the injection molded part, with no voids or air pockets in the boundary layer. It can also be seen that successful consolidation takes place in the area of the back injection. Note de contenu : - EXPERIMENTAL SETUP : Process sequences - Construction of the tool - Experimental part - Measuring and data assessment - RESULTS AND DISCUSSION : Regression based analysis – supervised machine learning - Shear-off tests - Microscopic examinations - Table 1 : Parameter settings DOI : https://doi.org/10.1515/ipp-2020-4105 En ligne : https://drive.google.com/file/d/1adgWM8gw2ZdjW_XVzM-AFsqCe58UgNsA/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36527 [article]

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