Impregnation & Preform Technologies

The focus of this field of competence is on Preform-LCM process chains. In these process chains, near-net shape preforms are first produced from rovings or textiles. The preforms are then impregnated in a liquid composite molding (LCM) process using a low-viscosity, usually thermoset matrix polymer by overpressure and/or vacuum.

The scientific basis of the field of competence is basic research on the effects of structural material variations and varying process conditions on the processing behavior of materials during preforming and impregnation. Experimental studies on self-developed measuring systems are synergetically combined with simulative studies and theoretical models in order to achieve a deeper understanding of processes and materials. On this basis, new and further development of preform LCM technologies, including the materials, tools and equipment used, is carried out.

 

Dr.-Ing.

David May

Junior Research Group Leader
TopComposite -
Topology-Optimized and
Resource Efficient Composites
for Mobility and Transport
as well as Manager Impregnation
& Preform Technologies

Special expertise:
Resin injection and infusion processes, preforming, permeability of fiber structures, manufacturing concepts and economic feasibility studies, integrated product development
Economic Sectors Applications (Examples)
Aeronautics & Space Fuselage structures
Automotive Chassis structures, structural components
Engineering Highly accelerated machine parts, cabinets
Sports & Recreation Bicycle, ski, boat building
Energy Rotor blades for wind power

Special Expertise

  • Continuous Profile Preforming
  • Programmable sewing machines with real-time process control
  • Dry Fiber Placement
  • SPS-controlled infusion systems
  • Technology carrier tool with extensive sensor equipment
  • Autoclave technology
  • Patented permeability measurement systems
  • GeoDict® - software for material simulation
  • Develoment of production concepts

Materials and Questions

Typical Materials

  • Thermoset resin systems and in-situ polymerizing thermoplastics
  • Glass/carbon fiber-based rovings and textiles, new and recycled
  • Thermoset and Thermoplastic binder and prepreg materials

Typical Questions

  • How to characterize the processing behavior of textiles during preforming and impregnation?
  • Which structural parameters determine the processing behavior?
  • How to achieve fast and robust impregnation?

Projects in this field

Publications from the IVW papers in this field of competence

  • Rimmel, O.

    Grundlagen der Imprägnierung von Dry Fiber Placement Preforms

  • Neumann, U.

    Kontinuierliches Ultraschall-Preformen zur Fertigung von CFK-Bauteilen in der Luftfahrt

  • Grieser, T.

    Textiles Formgebungsverhalten beim kontinuierlichen Preforming

  • May geb. Becker, D.

    Transversales Imprägnierverhalten textiler Verstärkungsstrukturen für Faserkunststoffverbunde

  • Arnold, M.

    Einfluss verschiedener Angussszenarien auf den Harzinjektionsprozess und dessen simulative Abbildung

  • Weiland, F.

    Ultraschall-Preformmontage zur Herstellung von CFK-Luftfahrtstrukturen

  • Rieber, G.

    Einfluss von textilen Parametern auf die Permeabilität von Multifilamentgeweben für Faserverbundkunststoffe

  • Molnàr, P.

    Stitching Technique Supported Preform Technology for Manufacturing Fiber Reinforced Polymer Composites

  • Ogale, A.

    Investigations of sewn preform characteristics and quality aspects fort he manufacturing of fiber reinforced polymer composites

  • Stadtfeld, H.

    Entwicklung einer Messzelle zur Bestimmung von Kompaktierungs- und Permeabilitätskennwerten bei flächigen Faserhalbzeugen

  • Mitschang, P. (Hrsg.)

    Prozessentwicklung und ganzheitliches Leichtbaukonzept zur durchgängigen, abfallfreien Preform-RTM Fertigung. BMBF Projekt - leider vergriffen!

  • Stöven, T.

    Beiträge zur Ermittlung der Permeabilität von flächigen Faserhalbzeugen

  • Weimer, C.

    Zur nähtechnischen Konfektion von textilen Verstärkungsstrukturen für Faser-Kunststoff-Verbunde

  • Kissinger, C.

    Ganzheitliche Betrachtung der Harzinjektionstechnik - Messsystem zur durchgängigen Fertigungskontrolle

  • Reuter, W.

    Hochleistungs-Faser-Kunststoff-Verbunde mit Class-A-Oberflächenqualität für den Einsatz in der Fahrzeugaußenhaut - leider vergriffen!

    External Publications „Impregnation & Preform Technologies“

    Modeling transverse mirco flow in dry fiber placement preforms

    Journal of Composite Materials 04/2019

    https://doi.org/10.1177/0021998319884612

    Impact of Stitchin on Permeability and Mechanical Properties of Preforms Manufactured by Dry Fiber Placement, Polymer Composites 5/2018
    doi.org

    Out–of–plane capillary pressure of technical textiles

    Composites Part A: Applied Science and Manufacturing 09/2019

    https://doi.org/10.1016/j.compositesa.2019.105495

    Wet Fiber Placement: A novel manufacturing technology for continuous fiber reinforced polymer composites

    Journal of Composite Materials 06/2018

    https://doi.org/10.1177/0021998318786998

    Out-of-plane permeability of 3D woven fabrics for composite structures

    The Journal of The Textile Institute 08/2019

    https://doi.org/10.1080/00405000.2019.1682759

    Recycling langer Kohlenstofffasern, Kunststoffe 5/2018
    www.kunststoffe.de

    In-plane permeability characterization of engineering textiles based on radial flow experiments: A benchmark exercise

    Composites Part A: Applied Science and Manufacturing 06/2019

    https://doi.org/10.1016/j.compositesa.2019.03.006

    Textile-Integrated Elastomer Surface for Fiber Reinforced Composites

    22nd Symposium on Composites 06/2019

    https://doi.org/10.4028/www.scientific.net/KEM.809.53

    Development & Validation of Recycled Carbon Fiber-Based Binder Tapes for Automated Tape Laying Processes, Journal of Composite Materials 11/2018
    doi.org

    Metrological determination of inhomogeneous hydrodynamic compaction during unsaturated out-of-plane permeability measurement of technical textiles

    Advanced Manufacturing: Polymer & Composites Science 04/2019

    https://doi.org/10.1080/20550340.2019.1598049

    A Novel Simulative-Experimental Approach to Determine the Permeability of Technical Textiles

    22nd Symposium on Composites 06/2019

    https://doi.org/10.4028/www.scientific.net/KEM.809.487

    Präzise Charakterisierung von Verstärkungstextilien
    PDF

    Dry fiber placement of carbon/steel fiber hybrid preforms for multifunctional composites

    Advanced Manufacturing: Polymer & Composites Science 03/2019

    https://doi.org/10.1080/20550340.2019.1585027