Clinching in In-situ CT – Experimental Study on Suitable Tool Materials

D. Köhler, R. Kupfer, J. Troschitz, M. Gude, ESAFORM 2021 (2021).

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Journal Article | Published | French
Author
Köhler, Daniel; Kupfer, Robert; Troschitz, Juliane; Gude, Maik
Abstract
<jats:p>In lightweight design, clinching is a cost-efficient solution as the joint is created through localized cold-forming of the joining parts. A clinch point’s quality is usually assessed using ex-situ destructive testing methods. These, however, are unable to detect phenomena immediately during the joining process. For instance, elastic deformations reverse and cracks close after unloading. In-situ methods such as the force-displacement evaluation are used to control a clinching process, though deviations in the clinch point geometry cannot be derived with this method. To overcome these limitations, the clinching process can be investigated using in-situ computed tomography (in-situ CT). However, a clinching tool made of steel would cause strong artefacts and a high attenuation in the CT measurement, reducing the significance of this method. Additionally, when joining parts of the same material, the sheet-sheet interface is hardly detectable. This work aims at identifying, firstly, tool materials that allow artefact-reduced CT measurements during clinching, and, secondly, radiopaque materials that can be applied between the joining parts to enhance the detectability of the sheet-sheet interface. Therefore, both CT-suitable tool materials and radiopaque materials are selected and experimentally investigated. In the clinching process, two aluminium sheets with radiopaque material in between are clinched in a single-step (rotationally symmetric joint without cut section). It is shown that e.g. silicon nitride is suited as tool material and a tin layer is suitable to enhance the detectability of the sheet-sheet interface.</jats:p>
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Journal Title
ESAFORM 2021
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Köhler D, Kupfer R, Troschitz J, Gude M. Clinching in In-situ CT – Experimental Study on Suitable Tool Materials. ESAFORM 2021. Published online 2021. doi:10.25518/esaform21.2781
Köhler, D., Kupfer, R., Troschitz, J., & Gude, M. (2021). Clinching in In-situ CT – Experimental Study on Suitable Tool Materials. ESAFORM 2021. https://doi.org/10.25518/esaform21.2781
@article{Köhler_Kupfer_Troschitz_Gude_2021, title={Clinching in In-situ CT – Experimental Study on Suitable Tool Materials}, DOI={10.25518/esaform21.2781}, journal={ESAFORM 2021}, publisher={University of Liege}, author={Köhler, Daniel and Kupfer, Robert and Troschitz, Juliane and Gude, Maik}, year={2021} }
Köhler, Daniel, Robert Kupfer, Juliane Troschitz, and Maik Gude. “Clinching in In-situ CT – Experimental Study on Suitable Tool Materials.” ESAFORM 2021, 2021. https://doi.org/10.25518/esaform21.2781.
D. Köhler, R. Kupfer, J. Troschitz, and M. Gude, “Clinching in In-situ CT – Experimental Study on Suitable Tool Materials,” ESAFORM 2021, 2021, doi: 10.25518/esaform21.2781.
Köhler, Daniel, et al. “Clinching in In-situ CT – Experimental Study on Suitable Tool Materials.” ESAFORM 2021, University of Liege, 2021, doi:10.25518/esaform21.2781.

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