Characterisation of lateral offsets in clinch points with computed tomography and transient dynamic analysis

D. Köhler, B. Sadeghian, J. Troschitz, R. Kupfer, M. Gude, A. Brosius, Journal of Advanced Joining Processes 5 (2022) 100089.

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Journal Article | English
Author
Köhler, D.; Sadeghian, B.; Troschitz, J.; Kupfer, R.; Gude, M.; Brosius, A.
Abstract
Clinching is a very cost-efficient method for joining two or more sheets made of identical or different materials. However, the current evaluation methods cannot confirm the critical geometrical features of joints such as neck thickness, undercut, and bottom thickness. Furthermore, the effects caused by joining process such as elastic deformation and crack-closure are significant for the joining quality, but often earn insufficient attention. Therefore, computed tomography (CT) and Transient Dynamic Analysis (TDA) as an ultrasonic testing and evaluation procedure are combined to overcome the obstacles mentioned above. In order to have a well-defined and reproducible typical geometrical error in clinching, specimens with a pre-specified lateral offset of the punch with 0.1 mm, 0.2 mm are as well as with no lateral offset are investigated using CT. The specimens are treated with conductive copper varnish in varying intensities to support the two sheets' distinguishability in the CT measurement. The subsequently extracted surfaces from CT-scan data are used to create three-dimensional models for a numerical Transient Dynamic Analysis. Hereby, a harmonic force is applied to one sheet and the transferred energy is determined at the opposite side of the clinch point on the other sheet. The transmitted energy can be used as a quantitative measure for the joining quality. This setup is simulated by means of Finite-Element-Method and the specimens are investigated experimentally using a piezo actuator and a piezo sensor. The novelty of the results presented here is the completely non-destructive investigation of joint specimen by CT of similar materials with a contrast given foil in between the sheets and the subsequent TDA, which can easily detect difference between the specimens by evaluation of the energy dissipation of the joints.
Publishing Year
Journal Title
Journal of Advanced Joining Processes
Volume
5
Page
100089
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Köhler D, Sadeghian B, Troschitz J, Kupfer R, Gude M, Brosius A. Characterisation of lateral offsets in clinch points with computed tomography and transient dynamic analysis. Journal of Advanced Joining Processes. 2022;5:100089. doi:10.1016/j.jajp.2021.100089
Köhler, D., Sadeghian, B., Troschitz, J., Kupfer, R., Gude, M., & Brosius, A. (2022). Characterisation of lateral offsets in clinch points with computed tomography and transient dynamic analysis. Journal of Advanced Joining Processes, 5, 100089. https://doi.org/10.1016/j.jajp.2021.100089
@article{Köhler_Sadeghian_Troschitz_Kupfer_Gude_Brosius_2022, title={Characterisation of lateral offsets in clinch points with computed tomography and transient dynamic analysis}, volume={5}, DOI={10.1016/j.jajp.2021.100089}, journal={Journal of Advanced Joining Processes}, author={Köhler, D. and Sadeghian, B. and Troschitz, J. and Kupfer, R. and Gude, M. and Brosius, A.}, year={2022}, pages={100089} }
Köhler, D., B. Sadeghian, J. Troschitz, R. Kupfer, M. Gude, and A. Brosius. “Characterisation of Lateral Offsets in Clinch Points with Computed Tomography and Transient Dynamic Analysis.” Journal of Advanced Joining Processes 5 (2022): 100089. https://doi.org/10.1016/j.jajp.2021.100089.
D. Köhler, B. Sadeghian, J. Troschitz, R. Kupfer, M. Gude, and A. Brosius, “Characterisation of lateral offsets in clinch points with computed tomography and transient dynamic analysis,” Journal of Advanced Joining Processes, vol. 5, p. 100089, 2022, doi: 10.1016/j.jajp.2021.100089.
Köhler, D., et al. “Characterisation of Lateral Offsets in Clinch Points with Computed Tomography and Transient Dynamic Analysis.” Journal of Advanced Joining Processes, vol. 5, 2022, p. 100089, doi:10.1016/j.jajp.2021.100089.

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