---
_id: '59683'
abstract:
- lang: eng
  text: "Woven fibre-reinforced polymers are used in a variety of application, especially
    where a low mass to stiffness ratio is required. Of paramount importance for the
    tailored mechanical properties these composite materials exhibit is the type and
    geometry of the fibre weave. Especially continuous fibre-reinforced thermoplastic
    composites are fabricated as laminates and subsequently exposed to forming processes
    which alter the geometry of the fibres unit cell and thus the local mechanical
    properties of the material. An approach utilising broadband ultrasonic waves is
    proposed to non-destructively determine the geometry of the unit cell of the weave.\r\n\r\nThe
    dispersive behaviour of woven fibre-reinforced sheets is described in accordance
    with the Flouquet-Bloch theorem as a phononic crystal. In order to develop a model
    for a description of these periodically structured waveguides, the smallest repeating
    unit of the wave is modelled with periodic boundary conditions. The resulting
    dispersion diagram exhibits similarities to that of a homogeneous plate, but additionally
    displays a periodicity in the wavenumber regime, which correspond with the size
    of the unit cell. Experimental studies of the dispersive behaviour of acoustic
    waves in woven fibre-reinforced samples also show a periodicity in the wavenumber
    regime, enabling a measurement procedure of the unit cell geometry."
author:
- first_name: Mareen
  full_name: Wippermann, Mareen
  id: '74624'
  last_name: Wippermann
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
- first_name: Philipp
  full_name: Brandes, Philipp
  id: '70091'
  last_name: Brandes
- first_name: Elmar
  full_name: Moritzer, Elmar
  id: '20531'
  last_name: Moritzer
- first_name: Bernd
  full_name: Henning, Bernd
  id: '213'
  last_name: Henning
citation:
  ama: 'Wippermann M, Claes L, Brandes P, Moritzer E, Henning B. Determination of
    the unit cell geometry in fibre-reinforced polymer sheets using guided acoustic
    waves. In: ; 2025. doi:<a href="https://doi.org/10.71568/DASDAGA2025.116">10.71568/DASDAGA2025.116</a>'
  apa: Wippermann, M., Claes, L., Brandes, P., Moritzer, E., &#38; Henning, B. (2025).
    <i>Determination of the unit cell geometry in fibre-reinforced polymer sheets
    using guided acoustic waves</i>. DAS | DAGA 2025 - 51st Annual Meeting on Acoustics,
    Copenhagen. <a href="https://doi.org/10.71568/DASDAGA2025.116">https://doi.org/10.71568/DASDAGA2025.116</a>
  bibtex: '@inproceedings{Wippermann_Claes_Brandes_Moritzer_Henning_2025, title={Determination
    of the unit cell geometry in fibre-reinforced polymer sheets using guided acoustic
    waves}, DOI={<a href="https://doi.org/10.71568/DASDAGA2025.116">10.71568/DASDAGA2025.116</a>},
    author={Wippermann, Mareen and Claes, Leander and Brandes, Philipp and Moritzer,
    Elmar and Henning, Bernd}, year={2025} }'
  chicago: Wippermann, Mareen, Leander Claes, Philipp Brandes, Elmar Moritzer, and
    Bernd Henning. “Determination of the Unit Cell Geometry in Fibre-Reinforced Polymer
    Sheets Using Guided Acoustic Waves,” 2025. <a href="https://doi.org/10.71568/DASDAGA2025.116">https://doi.org/10.71568/DASDAGA2025.116</a>.
  ieee: 'M. Wippermann, L. Claes, P. Brandes, E. Moritzer, and B. Henning, “Determination
    of the unit cell geometry in fibre-reinforced polymer sheets using guided acoustic
    waves,” presented at the DAS | DAGA 2025 - 51st Annual Meeting on Acoustics, Copenhagen,
    2025, doi: <a href="https://doi.org/10.71568/DASDAGA2025.116">10.71568/DASDAGA2025.116</a>.'
  mla: Wippermann, Mareen, et al. <i>Determination of the Unit Cell Geometry in Fibre-Reinforced
    Polymer Sheets Using Guided Acoustic Waves</i>. 2025, doi:<a href="https://doi.org/10.71568/DASDAGA2025.116">10.71568/DASDAGA2025.116</a>.
  short: 'M. Wippermann, L. Claes, P. Brandes, E. Moritzer, B. Henning, in: 2025.'
conference:
  end_date: 2025-03-20
  location: Copenhagen
  name: DAS | DAGA 2025 - 51st Annual Meeting on Acoustics
  start_date: 2025-03-17
date_created: 2025-04-25T06:46:31Z
date_updated: 2025-04-25T08:58:02Z
department:
- _id: '49'
- _id: '147'
doi: 10.71568/DASDAGA2025.116
language:
- iso: eng
main_file_link:
- open_access: '1'
oa: '1'
project:
- _id: '157'
  grant_number: '495847374'
  name: 'FaMOUS: Ein ultraschallbasiertes Messverfahren unter Berücksichtigung viskoelastischer
    Eigenschaften zur Charakterisierung der Faser-Matrix-Haftung bei Organoblechen
    sowie deren realitätsnahe Modellierung'
status: public
title: Determination of the unit cell geometry in fibre-reinforced polymer sheets
  using guided acoustic waves
type: conference
user_id: '11829'
year: '2025'
...