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Department of Mechanical Engineering

Automated Joining and Non-Destructive Testing of Tube-Fitting-Joints (AutoFit)

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in
  • Sonderverfahren
  • Technologieentwicklung
  • Industrienahe Forschung
  • Verbund- / Großprojekt
Scheme of the cyclic tensile test and experimentally determined elastic and plastic strains © IUL
Scheme of the cyclic tensile test and experimentally determined elastic and plastic strains
Funding BMWi/DLR
Project 20W1905C
Contact Florian Weber M. Sc.

In collaboration with PFW Aerospace, Steitz Präzisionstechnik. and the Fraunhofer Institute of Nondestructive Testing (IZFP), the Institute of Forming Technology and Lightweight Components (IUL) is working on this joint project since July 2020. By using the forming processes of hydraulic and electromagnetic expansion, a metallic (aluminum alloy 6061 T6) tube and a thermoplastic (polyetheretherketone, PEEK) tube are joined by a superposition of force-fit and form-fit. For the process design static and dynamic material properties are characterized. For the metallic joining partner, tensile tests as well as an inverse parameter identification via an electromagnetic ring expansion test are conducted. The material behavior of the PEEK is determined, i.a. by cyclic tensile tests, to separate elastic from plastic strains. Plastic true strains rise significantly above a value of total true strains of 0.038 and elastic true strains decrease for total true strains above 11% (see figure).