---
_id: '65577'
abstract:
- lang: eng
  text: <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>
author:
- first_name: Alrik
  full_name: Dargel, Alrik
  last_name: Dargel
- first_name: Juliane
  full_name: Troschitz, Juliane
  last_name: Troschitz
- first_name: Maik
  full_name: Gude, Maik
  last_name: Gude
- first_name: Robert
  full_name: Kupfer, Robert
  last_name: Kupfer
citation:
  ama: '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>'
  apa: '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>'
  bibtex: '@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} }'
  chicago: '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>.'
  ieee: '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>.'
  mla: '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>.'
  short: 'A. Dargel, J. Troschitz, M. Gude, R. Kupfer, in: E-Journal of Nondestructive
    Testing, NDT.net GmbH &#38; Co. KG, 2026.'
date_created: 2026-05-07T08:46:18Z
date_updated: 2026-05-07T09:01:52Z
doi: 10.58286/32601
intvolume: '        31'
issue: '3'
language:
- iso: eng
main_file_link:
- url: https://www.ndt.net/search/docs.php3?id=32601
project:
- _id: '148'
  name: TRR 285 - Subproject C04
publication: e-Journal of Nondestructive Testing
publication_identifier:
  issn:
  - 1435-4934
publication_status: published
publisher: NDT.net GmbH & Co. KG
status: public
title: 'In-situ CT of Viscoelastic Plastic Materials: A Radiography-Based Lead Time
  Determination for Composite–Metal Joints at Elevated Temperature'
type: conference
user_id: '114764'
volume: 31
year: '2026'
...