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In-Line Measurement of Fiber Mass Fraction Using Terahertz Spectroscopy for a Function-Oriented Quality Assurance of Glass Fiber Sheet Molding Compound

SSRN, ISSN: 1556-5068
2023
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Usage
    117
    • Abstract Views
      105
    • Downloads
      12

Article Description

Glass fiber sheet molding compounds are a popular fiber-reinforced polymer because of their good processability. Both fiber mass fraction (FMF) and fiber orientation distribution significantly determine the mechanical properties of manufactured components. Local random variations in both properties occur during prepreg production and molding. This contribution expands a non-destructive measurement model for local FMF using Terahertz spectroscopy towards multiple specimen thicknesses. A thorough measurement uncertainty analysis according to the Guide to the Expression of Uncertainty in Measurement (GUM) shows an uncertainty reduction by 70% compared to the uncertainty resulting from the manufacturing process. Measurement times of 0.5 seconds qualify the methodology for an in-line application. Integrating the measurement results into a parametrized, component-specific finite element model reduces the root mean squared error between physical experiments and simulations by 33 and 54% compared to simulations with nominal fiber mass fractions.

Bibliographic Details

Lucas Bretz; Gisela Lanza; Gudrun Niehues; Stefan Funkner; Erik Bründermann; Anke Susanne Müller

Elsevier BV

Multidisciplinary; Terahertz; Sheet Molding Compound; Fiber mass fraction; Glass fiber; Function-oriented measurement

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