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Mechanical and microstructural characterization of flowing weld lines in injection-molded short fiber-reinforced PBT

Article dans une revue avec comité de lecture
Auteur
BARADI, Mohamed Besher
356027 Robert Bosch Gmbh [Schwieberdingen]
CRUZ, Camilo
356027 Robert Bosch Gmbh [Schwieberdingen]
RIEDEL, Thomas
356027 Robert Bosch Gmbh [Schwieberdingen]
ccREGNIER, Gilles
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/14636
DOI
10.1016/j.polymertesting.2018.12.017
Date
2019
Journal
Polymer Testing

Résumé

The aim of this work is an extensive experimental mechanical and microstructural characterization of flowing weld lines (WLs) in injection-molded short glass fiber-reinforced polybutylenterephthalate (PBT) using X-ray computed tomography and digital image correlation (DIC). It was found that the induced fiber orientation (FO) in a flowing WL is similar to that induced by flow along a wall. In this test case, the impact of the flowing WL on the FO did not vanish after a flow length of 70 mm. The shape of the inserts, which originated the flowing WLs, only had a marginal effect on the induced FO gradient. By reducing part thickness, the erasing of the FO gradient induced by the WL is reached at shorter flow distances. At the WLs, there is a reduction of the fiber volume fraction in comparison to the regions far from the WL plane. DIC results show a pronounced strain localization at the WL, which can be explained by the FO gradient induced by the WL.

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PIMM-PT-BARADI-2019.pdf
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5.971Mo
Format:
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Fin d'embargo:
2019-06-30
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Documents liés

Visualiser des documents liés par titre, auteur, créateur et sujet.

  • Frontal weld lines in injection-molded short fiber-reinforced PBT: Extensive microstructure characterization for mechanical performance evaluation 
    Article dans une revue avec comité de lecture
    BARADI, Mohamed Besher; CRUZ, Camilo; RIEDEL, Thomas; ccREGNIER, Gilles (Wiley, 2019)
    Different factors contribute to the weakness of weld lines (WLs) induced by injection molding such as unsuitable fiber orientation (FO), incomplete polymer matrix diffusion, voids and V-notches. This study aims to characterize ...
  • Effects of a bent structure on the linear viscoelastic response of diluted carbon nanotube suspensions 
    Article dans une revue avec comité de lecture
    CRUZ, Camilo; ILLOUL, Lounès; ccREGNIER, Gilles; ccCHINESTA SORIA, Francisco (Springer Verlag, 2010)
    Commonly isolated carbon nanotubes in suspension have been modelled as a perfectly straight structure. Nevertheless, single-wall carbon nanotubes (SWNTs) contain naturally side-wall defects and, in consequence, natural ...
  • Review on the Brownian Dynamics Simulation of Bead-Rod-Spring Models Encountered in Computational Rheology 
    Article dans une revue avec comité de lecture
    CRUZ, Camilo; ccREGNIER, Gilles; ccCHINESTA SORIA, Francisco (Springer Verlag, 2012)
    Kinetic theory is a mathematical framework intended to relate directly the most relevant characteristics of the molecular structure to the rheological behavior of the bulk system. In other words, kinetic theory is a ...
  • Shear-strain step response in linear regime of dilute suspensions of naturally bent carbon nanotubes 
    Article dans une revue avec comité de lecture
    CRUZ, Camilo; ILLOUL, Lounès; ccREGNIER, Gilles; ccCHINESTA SORIA, Francisco (Wiley, 2012)
    Impressive enhancements of the storage modulus have been documented when low volume fractions of single wall carbon nanotubes (SWNTs) are added to a Newtonian solvent for obtaining dilute suspensions. The intrinsic bending ...
  • Towards an accurate pressure estimation in injection molding simulation using surrogate modeling 
    Article dans une revue avec comité de lecture
    SAAD, Sandra; SINHA, Alankar; CRUZ, Camilo; ccAMMAR, Amine; ccREGNIER, Gilles (Springer Nature, 2022-10)
    The computational cost of high-fidelity injection molding simulations has been growing in the past years making it more and more challenging to use them for performing analyses such as optimizations or uncertainty ...

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