A thermo-viscoelastic approach for the characterization and modeling of the bending behavior of thermoplastic composites – Part II

Steffen Ropers*, Ulrich Sachs, Marton Kardos, Tim A. Osswald

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    7 Citations (Scopus)

    Abstract

    A proper description of the bending behavior is crucial to obtain accurate forming simulations, especially for continuous fiber-reinforced thermoplastic composites. These materials exhibit a highly temperature and bending-curvature dependent bending stiffness. These dependencies make the property challenging to characterize with conventional characterization methods, and therefore require novel techniques. The first part of the study has shown how Dynamic Mechanical Analysis and a rheometer-based method can be used to examine viscoelastic bending behavior. This subsequent part focuses on combining their advantages in a universal characterization method, which provides an accurate description of the bending behavior over a broad temperature range, including the phase transition of recrystallization. Dynamic isothermal experiments as well as dynamic experiments over defined temperature ranges were conducted. The aforementioned experiments were reconstructed in simulations, employing the non-linear viscoelastic material model from the first part of the study, to evaluate the characterization method and to further validate the model.

    Original languageEnglish
    Pages (from-to)67-76
    Number of pages10
    JournalComposites Part A: Applied Science and Manufacturing
    Volume96
    DOIs
    Publication statusPublished - 1 May 2017

    Fingerprint

    Thermoplastics
    Composite materials
    Experiments
    Rheometers
    Dynamic mechanical analysis
    Temperature
    Phase transitions
    Stiffness
    Fibers

    Keywords

    • A. Thermoplastic resin
    • B. Thermomechanical
    • C. Finite element analysis (FEA)
    • D. Forming

    Cite this

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    abstract = "A proper description of the bending behavior is crucial to obtain accurate forming simulations, especially for continuous fiber-reinforced thermoplastic composites. These materials exhibit a highly temperature and bending-curvature dependent bending stiffness. These dependencies make the property challenging to characterize with conventional characterization methods, and therefore require novel techniques. The first part of the study has shown how Dynamic Mechanical Analysis and a rheometer-based method can be used to examine viscoelastic bending behavior. This subsequent part focuses on combining their advantages in a universal characterization method, which provides an accurate description of the bending behavior over a broad temperature range, including the phase transition of recrystallization. Dynamic isothermal experiments as well as dynamic experiments over defined temperature ranges were conducted. The aforementioned experiments were reconstructed in simulations, employing the non-linear viscoelastic material model from the first part of the study, to evaluate the characterization method and to further validate the model.",
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    A thermo-viscoelastic approach for the characterization and modeling of the bending behavior of thermoplastic composites – Part II. / Ropers, Steffen; Sachs, Ulrich ; Kardos, Marton; Osswald, Tim A.

    In: Composites Part A: Applied Science and Manufacturing, Vol. 96, 01.05.2017, p. 67-76.

    Research output: Contribution to journalArticleAcademicpeer-review

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