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Professor Böhlke
Prof. Dr.-Ing. Thomas Böhlke

+49 721 608-48852

thomas boehlkeVza5∂kit edu


Prof. Dr.-Ing. Frank Henning
Co-Speaker, PI Speaker of the Research Area Technology
FAST, Head of Institute

+49 721 608 45384

frank henning∂kit edu

Tom-Alexander Langhoff
Dr.-Ing. Tom-Alexander Langhoff
Academic Director

+49 721 608-46905

tom-alexander langhoffEzs0∂kit edu


The funding by the German Research Foundation (DFG) is gratefully acknowledged. www.dfg.de


The funding by the Natural Sciences and Engineering Research Council of Canada (NSERC) is gratefully acknowledged.

Terminology of Materials

The class of Fiber Reinforced Polymers (FRP) can be separated into continuous (CoFRP) and discontinuous (DiCoFRP) fiber reinforced polymers. For the combination of CoFRP and DiCoFRP in one component, the abbreviation CoDiCoFRP is used.

Fig. 1 Terminology of CoFRP, DiCoFRP and CoDiCoFRP



  • The arrangement of continuous fibers are approximately homogeneous


  • The orientation distribution and the spatial arrangement of fibers show a significant degree of inhomogeneity and randomness
  • Fiber congregations and optional filler particles may be present
  • The strong spatial inhomogeneity is induced by the manufacturing process

Fiber Reinforced Thermoplastics and Thermosets


Fig. 2 Classification of fiber reinforced polymers based on average fiber length:

continuous fibers (left), long fibers (middle), short fibers (right)


  • Classification of the materials is usually introduced based on the average fiber length (Fig. 2)
  • Separation between short fiber and long fiber reinforced composites (LFT) manufactured in compression molding is usually in the range of approximately 4 mm


  • Description is oriented on the manufacturing process of the compound
    - Bulk Molding Compound (BMC)
    - Sheet Molding Compound (SMC)
  • No precise generally accepted separation concerning the used fiber lengths for SMC


  • Unified notation for all of the aforementioned composite types with respect to the fiber arrangement and the polymer system
    - Thermoset (TS)
    - Thermoplastic (TP)
  • Subdivided into
    - CoFRTP

Abbreviations for different classes of composites

Fig. 3 Abbreviations for different classes of composites with specification of the polymer system

Combining the Advantages of Two Types of Reinforcements

Main advantages

  • DiCoFRP
    + Bulk material flow capability
    + Significant increase in the design freedom for components
    Low load-bearing capacity
  • CoFRP
    + High load-bearing capacity
    Restricted design freedom and formability

  • CoDiCoFRP
    + Optimal combination of design options
    + High stiffness and strength