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New design of hybrid joint structures

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Project Acronym
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Vehicle design and manufacturing (VDM)
Transport mode
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Transport policies
Societal/Economic issues
Transport sectors
Passenger transport,
Freight transport


Background & Policy context

Using welding methods for aluminium components causes a loss in solidity. Therefore, other methods to join them up are required. Thereby lighter constructions can be produced in a cost-efficient way.


It is the objective of the ProKnos project to figure out and assess different ways and methods to design new joint structures.


ProKnos is a common project of “Zeppelin Luftschifftechnik” ZLT and the “Institute of lightweight structures, University of Munich” LLB. This co-operational network ensures a broad knowledge in theoretical and practical issues. The project is divided into 3 subprojects:

  • Subproject 1:  joint structures for an aluminium truss.
  • Subproject 2: application of force in an aluminium truss
  • Subproject 3: application of force in CFRP structures


Parent Programmes
Institution Type
Public institution
Institution Name
Federal Ministry of Economics and Technology (BMWi)
Type of funding
Public (national/regional/local)


According to the different subprojects, the following results have been achieved:

  • Subproject 1- joint structures for an aluminium truss: Instead of using welding methods, the construction contains glued socket joints. Applying this method, firmer aluminium alloys can be used, because it is not necessary to weld them. Experiments proofed a potential of 27% weight reduction when applying the new method. The glue “Araldite 2014” was found out being the best option.
  • Subproject 2- application of force in an aluminum truss: On a bench, the resistance of components for a special joint structure was tested. Thereby, important information about the material was recorded: Which forces and repetitions lead to a fatigue fracture?
  • Subproject 3- application of force in CFRP structures: A literature review on the embedding strength of CFRP (carbon-fibre-reinforced plastic) was carried out. In a second work package, application of force for “sandwich structures” was tested. In a third work package, special connecting elements (Company: “Click bond”) were tested concerning their resistance against external loads.

Findings of the study are published by a final report (German only), which is available online via the Technical Information Library (TIB) of the Hannover University:


Lead Organisation
EU Contribution
Partner Organisations
EU Contribution


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