@inproceedings{59683,
  abstract     = {{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.

The 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       = {{Wippermann, Mareen and Claes, Leander and Brandes, Philipp and Moritzer, Elmar and Henning, Bernd}},
  location     = {{Copenhagen}},
  title        = {{{Determination of the unit cell geometry in fibre-reinforced polymer sheets using guided acoustic waves}}},
  doi          = {{10.71568/DASDAGA2025.116}},
  year         = {{2025}},
}

@inproceedings{59688,
  author       = {{Claes, Leander and Zeipert, Henning and Brandes, Philipp and Moritzer, Elmar and Henning, Bernd}},
  location     = {{Copenhagen}},
  title        = {{{Assessment of Fibre-Matrix Adhesion in Reinforced Polymers by Modal Damping of Guided Acoustic Waves}}},
  doi          = {{10.71568/DASDAGA2025.052}},
  year         = {{2025}},
}

@phdthesis{51732,
  author       = {{Richters, Maximilian}},
  title        = {{{Herstellung und Charakterisierung von Wood-Plastic-Composites (WPC) mit einer Matrix aus thermoplastischen Polyurethanen zur Erzeugung einer Holz-WPC-Verbundstruktur }}},
  year         = {{2024}},
}

@phdthesis{52404,
  author       = {{Flachmann, Felix}},
  isbn         = {{978-3-8440-9432-9}},
  pages        = {{140}},
  publisher    = {{Shaker Verlag}},
  title        = {{{Untersuchung des Füllverhaltens holzfaserverstärkter Kunststoffe (WPC) mit hohen Füllstoffgehalten}}},
  volume       = {{Band 4}},
  year         = {{2024}},
}

@phdthesis{55093,
  author       = {{Tölle, Lisa}},
  isbn         = {{978-3-8440-9546-3}},
  publisher    = {{Shaker Verlag}},
  title        = {{{Ein Beitrag zur Steuerung der Faserstaubentwicklung faserverstärkter Kunststoffe beim mechanischen Recycling }}},
  year         = {{2024}},
}

@article{42515,
  abstract     = {{<jats:p> Microcellular wood fiber reinforced polymers offer the possibility to reduce the use of fossil raw materials. In particular, thick-walled structures with thicknesses greater than 6 mm offer a high potential for weight savings. This study investigates the cell structures and mechanical properties of injection-molded test specimens. The influence of different thicknesses (6–10 mm) along with different chemical blowing agents (endothermic, exothermic) with varying dosages (0–2 wt%) is analyzed. The investigations reveal that exothermic chemical blowing agents form finer cells consistently to thin-walled structures than endothermic ones. Higher foaming agent content leads to higher pore fractions, with many small cells coalescing into a large open-pore cell network. The mechanical properties depend mainly on the pore content of the sample. The specific tensile properties deteriorate with the use of chemical blowing agents (CFA), whereas the sandwich structure produced with compact edge layers has a positive influence on the specific flexural properties. </jats:p>}},
  author       = {{Moritzer, Elmar and Flachmann, Felix}},
  issn         = {{0021-955X}},
  journal      = {{Journal of Cellular Plastics}},
  keywords     = {{Materials Chemistry, Polymers and Plastics, General Chemistry}},
  number       = {{3}},
  pages        = {{187--199}},
  publisher    = {{SAGE Publications}},
  title        = {{{Morphological and mechanical properties of foamed thick-walled Wood-Plastic-Composite structures}}},
  doi          = {{10.1177/0021955x231161175}},
  volume       = {{59}},
  year         = {{2023}},
}

@techreport{33070,
  author       = {{Fuhrmann, Anika and Schoch, Rebecca  and Rusam, Alexander and Bosse, Michael and Flachmann, Felix and Moritzer, Elmar and Hochrein, Thomas and Bastian, Martin}},
  publisher    = {{Shaker}},
  title        = {{{Verbessertes Füllverhalten im Spritzgießprozess durch Schäumen von WPC: Bewertung des Fließverhaltens treibmittelbeladener Polymerschmelzen}}},
  year         = {{2022}},
}

@article{33856,
  abstract     = {{<jats:p>Wood–plastic composites (WPC) are enjoying a steady increase in popularity. In addition to the extrusion of decking boards, the material is also used increasingly in injection molding. Depending on the formulation, geometry and process parameters, WPC tends to exhibit irregular filling behavior, similar to the processing of thermosets. In this work, the influence of matrix material and wood fiber content on the flow, mold filling and segregation behavior of WPC is analyzed. For this purpose, investigations were carried out on a flow spiral and a sheet cavity. WPC based on thermoplastic polyurethane (TPU) achieves significantly higher flow path lengths at a wood mass content of 30% than polypropylene (PP)-based WPC. The opposite behavior occurs at higher wood contents due to the different shear thinning behavior. Slightly decreased wood contents could be observed at the beginning of the flow path and greatly increased wood contents at the end of the flow path, compared to the starting material. When using the plate cavity, flow anomalies in the form of free jets occur as a function of the wood content, with TPU exhibiting the more critical behavior. The flow front is frayed, but in contrast to the flow spiral, no significant wood accumulation could be detected due to the shorter flow path lengths.</jats:p>}},
  author       = {{Moritzer, Elmar and Flachmann, Felix and Richters, Maximilian and Neugebauer, Marcel}},
  issn         = {{2504-477X}},
  journal      = {{Journal of Composites Science}},
  keywords     = {{Engineering (miscellaneous), Ceramics and Composites}},
  number       = {{10}},
  publisher    = {{MDPI AG}},
  title        = {{{Analysis of the Segregation Phenomena of Wood Fiber Reinforced Plastics}}},
  doi          = {{10.3390/jcs6100321}},
  volume       = {{6}},
  year         = {{2022}},
}

@article{26854,
  author       = {{Moritzer, Elmar and Flachmann, Felix}},
  journal      = {{Kunststoffe}},
  pages        = {{42--44}},
  title        = {{{Die Fließfront darf nicht brechen}}},
  volume       = {{12}},
  year         = {{2021}},
}

@inproceedings{26390,
  author       = {{Moritzer, Elmar and Flachmann, Felix}},
  booktitle    = {{PPS-36 Proceedings}},
  location     = {{Montreal}},
  title        = {{{Process-reliable Injection Molding of Highly Filled Wood-Plastic-Composites (WPC)}}},
  year         = {{2021}},
}

@inbook{24479,
  author       = {{Moritzer, Elmar and Hüttner, M. and Henning, Bernd and Webersen, Manuel}},
  booktitle    = {{Advances in Polymer Processing 2020}},
  title        = {{{The Influence of Hydrothermal Aging on the Material Properties of Continuous Fiber-Reinforced Thermoplastics and its Non-Destructive Characterization}}},
  doi          = {{10.1007/978-3-662-60809-8_16}},
  year         = {{2020}},
}