Page 30 - Research Report 2021 - Institut für Leichtbau und Kunststofftechnik

SFB/TRR 285 - C04

Local and integral in-situ analysis of process- and operation-related
damage effects of joints

The deformation and damage phenomena during the manufacture and test- Period
ing of mechanical joints cannot yet be directly observed and characterized 01.07.2019 – 30.06.2023
in detail due to the limited accessibility of the joint. Instead, a joint must first
be unloaded, specimen must be prepared destructively e.g. for micrographs Project management
and are then analyzed to evaluate the consequences of a load. In this ex-situ Dr.-Ing. Robert Kupfer
analysis, elastic deformations reset as a result of unloading, whereby cracks
that have been introduced potentially close and thus can only be detected Contact
to a limited extent. Daniel Köhler
Juliane Troschitz
The aim of the ILK in the TRR285 subproject is the development of a non-de-
structive in-situ testing method for mechanical joints. For a high-resolution Project partners
analysis, a novel experimental method using X-ray computed tomography Chair of Forming Processes (FF) at the
(in-situ CT) is being developed. This method allows the three-dimensional Institute of Manufacturing Science and
observation of the joining zone during the joining process or loading. For this Engineering (IF) at the TU Dresden
purpose, in-situ joining and testing devices were developed and successfully
put into operation on the basis of preliminary experimental investigations. Funding
Initial in-situ clinch and tensile shear tests have already demonstrated the Funded by
potential of the new testing method; see Fig. 01 and Fig. 02.

German Research Foundation
Detector Clamp X-ray Tube
German Research Foundation (DFG)
Project number: 418701707 – TRR 285

Fig. 01 In-situ test setup (left) and reconstructed 3D image of an aluminum clinch joint
under shear loading (right).

Fig. 02 Series image of an aluminum clinch joint under increasing load.

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