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WEB Determination of the mechanical properties of a sintered CFRP connection module joined by a thread forming screw

Wednesday (29.04.2020)
11:20 - 11:40 Room 1

Multi-material designs of carbon fiber reinforced plastics (CFRP) and metals are used in a wide field of applications, such as automotive and aerospace. It allows the optimal use of the materials in combination with low structural weights. In order to fully exploit the potential of the CFRP, innovative and process safe approaches for load introduction and joining are essential.

For this purpose, a sintered connection module was developed. It ensures the load introduction in the CFRP and joining between the CFRP and metal. Carbon fiber rovings are placed in the tailored fiber placement (TFP) process according to the load path and are integrated in a carbon fiber textile fabric. A body of stainless steel is sintered locally on the textile preform using powder metallurgical methods like spark plasma sintering. The so created hybrid textiles are manufactured into parts by using the resin transfer moulding (RTM). The sintered metal body on the CFRP parts enables the use of conventional metal joining technology, e.g. screws or welding, with the associated tolerances.

This work aims at the characterization of the sintered CFRP connection module in means of microstructure and mechanical performance. The specimens were joined using a M6 thread forming screw. Quasi-static tests under different load conditions were carried out to determine the mechanical properties of the joined structure. Therefore, the individual components, such as the sintered metal, CFRP, and the whole structure were examined. The results will be displayed according to the documented strength levels within the joining area. The results show a way to tailor the predetermined breaking point in CFRP structures.

Additionally, CT images of the manufactured specimens were analyzed to identify the fiber structure inside the sintered metal. Metallography was used to examine the transition area between the carbon fibers and the sintered metal.

Dipl.-Ing. Alexander Marx
Faserinstitut Bremen e.V.
Additional Authors:
  • Thomas Hutsch
    Fraunhofer Institute for Manufacturing Technology and Advanced Materials, IFAM
  • Dr. Patrick Schiebel
    Faserinstitut Bremen e.V.
  • Dr. Dirk Feltin
    Hightex Verstärkungsstrukturen GmbH
  • Dr. Frank Hoffmeister
    Schrauben Betzer GmbH & Co. KG
  • Andreas Babbel
    Schrauben Betzer GmbH & Co. KG


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Paper Version 3 Edited Version of the manuskript to the lecture 1 MB Download
Presentation Version 1 This is the presentation to the paper 2 MB Download
Presentation Version 2 This is the presentation to the manuskript 2 MB Download