conference paper published Alrik Dargel author Juliane Troschitz author Maik Gude author Robert Kupfer author TRR 285 - Subproject C04 project <jats:p>In-situ computed tomography (CT) experiments on materials with time-dependent mechanical behaviour are affected by relaxationinduced motion, which can lead to image blur and motion-related artefacts if scans are initiated before relaxation-induced motion has subsided. Scan start times are therefore commonly defined based on force relaxation or force-gradient criteria, although these signals do not directly quantify image-relevant specimen motion. In this work, a radiography-based approach is presented to estimate relaxation-induced motion via pixel shifts from projection images acquired prior to CT scans. These projection-based pixel shift estimates of relaxation-induced motion are related to scan-specific image blur observed in the reconstructed volumes. Thereby, a direct link between specimen motion during the scan and CT image quality is established. The method is demonstrated for thermo-mechanically loaded specimens with pronounced temperature-dependent material behaviour, where relaxation-induced motion persists over extended time scales. The results show that projection-based pixel shift estimation provides a physically meaningful and experimentally accessible basis for defining scan start criteria. CT acquisition can be initiated based on an allowable level of relaxation-induced motion, rather than waiting for mechanical equilibrium to be reached. The proposed approach therefore offers a direct, image-related framework for scan timing in in-situ CT experiments on time-dependent materials.</jats:p> NDT.net GmbH & Co. KG2026 eng 1435-493410.58286/32601 313 Dargel, Alrik, Juliane Troschitz, Maik Gude, and Robert Kupfer. “In-Situ CT of Viscoelastic Plastic Materials: A Radiography-Based Lead Time Determination for Composite–Metal Joints at Elevated Temperature.” In <i>E-Journal of Nondestructive Testing</i>, Vol. 31. NDT.net GmbH &#38; Co. KG, 2026. <a href="https://doi.org/10.58286/32601">https://doi.org/10.58286/32601</a>. A. Dargel, J. Troschitz, M. Gude, and R. Kupfer, “In-situ CT of Viscoelastic Plastic Materials: A Radiography-Based Lead Time Determination for Composite–Metal Joints at Elevated Temperature,” in <i>e-Journal of Nondestructive Testing</i>, 2026, vol. 31, no. 3, doi: <a href="https://doi.org/10.58286/32601">10.58286/32601</a>. Dargel A, Troschitz J, Gude M, Kupfer R. In-situ CT of Viscoelastic Plastic Materials: A Radiography-Based Lead Time Determination for Composite–Metal Joints at Elevated Temperature. In: <i>E-Journal of Nondestructive Testing</i>. Vol 31. NDT.net GmbH &#38; Co. KG; 2026. doi:<a href="https://doi.org/10.58286/32601">10.58286/32601</a> Dargel, A., Troschitz, J., Gude, M., &#38; Kupfer, R. (2026). In-situ CT of Viscoelastic Plastic Materials: A Radiography-Based Lead Time Determination for Composite–Metal Joints at Elevated Temperature. <i>E-Journal of Nondestructive Testing</i>, <i>31</i>(3). <a href="https://doi.org/10.58286/32601">https://doi.org/10.58286/32601</a> @inproceedings{Dargel_Troschitz_Gude_Kupfer_2026, title={In-situ CT of Viscoelastic Plastic Materials: A Radiography-Based Lead Time Determination for Composite–Metal Joints at Elevated Temperature}, volume={31}, DOI={<a href="https://doi.org/10.58286/32601">10.58286/32601</a>}, number={3}, booktitle={e-Journal of Nondestructive Testing}, publisher={NDT.net GmbH &#38; Co. KG}, author={Dargel, Alrik and Troschitz, Juliane and Gude, Maik and Kupfer, Robert}, year={2026} } A. Dargel, J. Troschitz, M. Gude, R. Kupfer, in: E-Journal of Nondestructive Testing, NDT.net GmbH &#38; Co. KG, 2026. Dargel, Alrik, et al. “In-Situ CT of Viscoelastic Plastic Materials: A Radiography-Based Lead Time Determination for Composite–Metal Joints at Elevated Temperature.” <i>E-Journal of Nondestructive Testing</i>, vol. 31, no. 3, NDT.net GmbH &#38; Co. KG, 2026, doi:<a href="https://doi.org/10.58286/32601">10.58286/32601</a>. 655772026-05-07T08:46:18Z2026-05-07T09:01:52Z