--- _id: '64916' abstract: - lang: eng text: The joining of dissimilar materials, such as steel and aluminum, entails significant challenges during thermal curing processes due to differing coefficients of thermal expansion. This study addresses the formation of “viscous fingering” instabilities in structural adhesive joints, which are induced by thermally driven relative displacements during the liquid phase of the adhesive. Using a component-like specimen “bridge specimen,” the dependency of this phenomenon on process temperature and structural stiffness (rivet distance) was characterized. Experimental results reveal that while the relative displacement scales cubically with the free buckling length, the resulting adhesive area reduction follows an exponential trend, leading to a loss of effective bond area of up to 79%, which significantly compromises the joint strength in automotive applications. To predict these process-induced defects, a thermo-chemo-viscoelastic-viscoplastic adhesive model implemented in LS-DYNA was applied. The model combines curing kinetics, viscoelastic relaxation, and pressure-dependent plasticity and features a geometric damage parameter (D) that captures the adhesive area reduction caused by viscous fingering as an exponential function of the accumulated normal strain in the liquid phase. This damage parameter, calibrated on base-specimen level, was transferred to the component geometry. The simulation demonstrated high predictive accuracy with a maximum deviation of the adhesive area reduction of 3.1% compared to experimental data. This validates the model’s capability to predict manufacturing-induced damage in complex hybrid structures solely based on thermal boundary conditions. article_type: original author: - first_name: Mohamad full_name: Al Trjman, Mohamad id: '65415' last_name: Al Trjman - first_name: Felix full_name: Beule, Felix id: '66192' last_name: Beule - first_name: Dominik full_name: Teutenberg, Dominik id: '537' last_name: Teutenberg - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 - first_name: Julia full_name: Riese, Julia id: '101499' last_name: Riese orcid: 0000-0002-3053-0534 citation: ama: Al Trjman M, Beule F, Teutenberg D, Meschut G, Riese J. Experimental characterization and numerical analysis of the influence of the CED coating process on viscous fingering formation in hybrid-jointed mixed structures. The Journal of Adhesion. Published online 2026:1-24. doi:10.1080/00218464.2026.2644394 apa: Al Trjman, M., Beule, F., Teutenberg, D., Meschut, G., & Riese, J. (2026). Experimental characterization and numerical analysis of the influence of the CED coating process on viscous fingering formation in hybrid-jointed mixed structures. The Journal of Adhesion, 1–24. https://doi.org/10.1080/00218464.2026.2644394 bibtex: '@article{Al Trjman_Beule_Teutenberg_Meschut_Riese_2026, title={Experimental characterization and numerical analysis of the influence of the CED coating process on viscous fingering formation in hybrid-jointed mixed structures}, DOI={10.1080/00218464.2026.2644394}, journal={The Journal of Adhesion}, publisher={Informa UK Limited}, author={Al Trjman, Mohamad and Beule, Felix and Teutenberg, Dominik and Meschut, Gerson and Riese, Julia}, year={2026}, pages={1–24} }' chicago: Al Trjman, Mohamad, Felix Beule, Dominik Teutenberg, Gerson Meschut, and Julia Riese. “Experimental Characterization and Numerical Analysis of the Influence of the CED Coating Process on Viscous Fingering Formation in Hybrid-Jointed Mixed Structures.” The Journal of Adhesion, 2026, 1–24. https://doi.org/10.1080/00218464.2026.2644394. ieee: 'M. Al Trjman, F. Beule, D. Teutenberg, G. Meschut, and J. Riese, “Experimental characterization and numerical analysis of the influence of the CED coating process on viscous fingering formation in hybrid-jointed mixed structures,” The Journal of Adhesion, pp. 1–24, 2026, doi: 10.1080/00218464.2026.2644394.' mla: Al Trjman, Mohamad, et al. “Experimental Characterization and Numerical Analysis of the Influence of the CED Coating Process on Viscous Fingering Formation in Hybrid-Jointed Mixed Structures.” The Journal of Adhesion, Informa UK Limited, 2026, pp. 1–24, doi:10.1080/00218464.2026.2644394. short: M. Al Trjman, F. Beule, D. Teutenberg, G. Meschut, J. Riese, The Journal of Adhesion (2026) 1–24. date_created: 2026-03-14T18:43:41Z date_updated: 2026-03-14T19:04:46Z ddc: - '620' - '670' - '660' department: - _id: '9' doi: 10.1080/00218464.2026.2644394 file: - access_level: closed content_type: application/pdf creator: mohamada date_created: 2026-03-14T18:50:31Z date_updated: 2026-03-14T18:50:31Z file_id: '64917' file_name: Experimental characterization and numerical analysis of the influence of the CED coating process on viscous fingering formation in hybrid-jointed mixe.pdf file_size: 14668789 relation: main_file success: 1 file_date_updated: 2026-03-14T18:50:31Z has_accepted_license: '1' keyword: - Adhesive area reduction - CED coating process - delta alpha problem - epoxy structural adhesive - influence of manufacture - multi-material design - numerical simulation (FEM) - relative displacements - viscous fingering (saffman-taylor-instability). language: - iso: eng main_file_link: - open_access: '1' oa: '1' page: 1-24 publication: The Journal of Adhesion publication_identifier: issn: - 0021-8464 - 1545-5823 publication_status: published publisher: Informa UK Limited status: public title: Experimental characterization and numerical analysis of the influence of the CED coating process on viscous fingering formation in hybrid-jointed mixed structures type: journal_article user_id: '65415' year: '2026' ... --- _id: '54802' abstract: - lang: eng text: Motivated by the prospect of nano-robots that assist human physiological functions at the nanoscale, we investigate the coating problem in the three-dimensional model for hybrid programmable matter. In this model, a single agent with strictly limited viewing range and the computational capability of a deterministic finite automaton can act on passive tiles by picking up a tile, moving, and placing it at some spot. The goal of the coating problem is to fill each node of some surface graph of size n with a tile. We first solve the problem on a restricted class of graphs with a single tile type, and then use constantly many tile types to encode this graph in certain surface graphs capturing the surface of 3D objects. Our algorithm requires O(n^2) steps, which is worst-case optimal compared to an agent with global knowledge and no memory restrictions. author: - first_name: Irina full_name: Kostitsyna, Irina last_name: Kostitsyna - first_name: David Jan full_name: Liedtke, David Jan id: '55557' last_name: Liedtke - first_name: Christian full_name: Scheideler, Christian id: '20792' last_name: Scheideler citation: ama: 'Kostitsyna I, Liedtke DJ, Scheideler C. Universal Coating by 3D Hybrid Programmable Matter. In: Emek Y, ed. Structural Information and Communication Complexity. Springer Nature Switzerland; 2024. doi:10.1007/978-3-031-60603-8_21' apa: Kostitsyna, I., Liedtke, D. J., & Scheideler, C. (2024). Universal Coating by 3D Hybrid Programmable Matter. In Y. Emek (Ed.), Structural Information and Communication Complexity. Springer Nature Switzerland. https://doi.org/10.1007/978-3-031-60603-8_21 bibtex: '@inbook{Kostitsyna_Liedtke_Scheideler_2024, place={Cham}, title={Universal Coating by 3D Hybrid Programmable Matter}, DOI={10.1007/978-3-031-60603-8_21}, booktitle={Structural Information and Communication Complexity}, publisher={Springer Nature Switzerland}, author={Kostitsyna, Irina and Liedtke, David Jan and Scheideler, Christian}, editor={Emek, Yuval}, year={2024} }' chicago: 'Kostitsyna, Irina, David Jan Liedtke, and Christian Scheideler. “Universal Coating by 3D Hybrid Programmable Matter.” In Structural Information and Communication Complexity, edited by Yuval Emek. Cham: Springer Nature Switzerland, 2024. https://doi.org/10.1007/978-3-031-60603-8_21.' ieee: 'I. Kostitsyna, D. J. Liedtke, and C. Scheideler, “Universal Coating by 3D Hybrid Programmable Matter,” in Structural Information and Communication Complexity, Y. Emek, Ed. Cham: Springer Nature Switzerland, 2024.' mla: Kostitsyna, Irina, et al. “Universal Coating by 3D Hybrid Programmable Matter.” Structural Information and Communication Complexity, edited by Yuval Emek, Springer Nature Switzerland, 2024, doi:10.1007/978-3-031-60603-8_21. short: 'I. Kostitsyna, D.J. Liedtke, C. Scheideler, in: Y. Emek (Ed.), Structural Information and Communication Complexity, Springer Nature Switzerland, Cham, 2024.' date_created: 2024-06-18T07:36:04Z date_updated: 2024-07-18T09:32:58Z department: - _id: '79' doi: 10.1007/978-3-031-60603-8_21 editor: - first_name: Yuval full_name: Emek, Yuval last_name: Emek keyword: - Programmable Matter - Coating - Finite Automaton - 3D language: - iso: eng place: Cham publication: Structural Information and Communication Complexity publication_identifier: isbn: - '9783031606021' - '9783031606038' issn: - 0302-9743 - 1611-3349 publication_status: published publisher: Springer Nature Switzerland status: public title: Universal Coating by 3D Hybrid Programmable Matter type: book_chapter user_id: '55557' year: '2024' ... --- _id: '22272' abstract: - lang: eng text: The number of multi-material joints is increasing as a result of lightweight design. Self-piercing riveting (SPR) is an important mechanical joining technique for multi-material structures. Rivets for SPR are coated to prevent corrosion, but this coating also influences the friction that prevails during the joining process. The aim of the present investigation is to evaluate this influence. The investigation focuses on the common rivet coatings Almac® and zinc-nickel with topcoat as well as on uncoated rivet surfaces. First of all, the coating thickness and the uniformity of the coating distribution are analysed. Friction tests facilitate the classification of the surface properties. The influence of the friction on the characteristic joint parameters and the force-stroke curves is analysed by means of experimental joining tests. More in-depth knowledge of the effects that occur is achieved through the use of numerical simulation. Overall, it is shown that the surface condition of the rivet has an impact on the friction during the joining process and on the resulting joint. However, the detected deviations between different surface conditions do not restrict the operational capability of SPR and the properties of uncoated rivet surfaces, in particular, are similar to those of Almac®-coated rivets. It can thus be assumed that SPR with respect to the joining process is also possible without rivet coating in principle. author: - first_name: Benedikt full_name: Uhe, Benedikt id: '38131' last_name: Uhe - first_name: Clara-Maria full_name: Kuball, Clara-Maria last_name: Kuball - first_name: Marion full_name: Merklein, Marion last_name: Merklein - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: ama: Uhe B, Kuball C-M, Merklein M, Meschut G. Influence of the Rivet Coating on the Friction during Self-Piercing Riveting. Key Engineering Materials. 2021;883:11-18. doi:10.4028/www.scientific.net/KEM.883.11 apa: Uhe, B., Kuball, C.-M., Merklein, M., & Meschut, G. (2021). Influence of the Rivet Coating on the Friction during Self-Piercing Riveting. Key Engineering Materials, 883, 11–18. https://doi.org/10.4028/www.scientific.net/KEM.883.11 bibtex: '@article{Uhe_Kuball_Merklein_Meschut_2021, title={Influence of the Rivet Coating on the Friction during Self-Piercing Riveting}, volume={883}, DOI={10.4028/www.scientific.net/KEM.883.11}, journal={Key Engineering Materials}, author={Uhe, Benedikt and Kuball, Clara-Maria and Merklein, Marion and Meschut, Gerson}, year={2021}, pages={11–18} }' chicago: 'Uhe, Benedikt, Clara-Maria Kuball, Marion Merklein, and Gerson Meschut. “Influence of the Rivet Coating on the Friction during Self-Piercing Riveting.” Key Engineering Materials 883 (2021): 11–18. https://doi.org/10.4028/www.scientific.net/KEM.883.11.' ieee: 'B. Uhe, C.-M. Kuball, M. Merklein, and G. Meschut, “Influence of the Rivet Coating on the Friction during Self-Piercing Riveting,” Key Engineering Materials, vol. 883, pp. 11–18, 2021, doi: 10.4028/www.scientific.net/KEM.883.11.' mla: Uhe, Benedikt, et al. “Influence of the Rivet Coating on the Friction during Self-Piercing Riveting.” Key Engineering Materials, vol. 883, 2021, pp. 11–18, doi:10.4028/www.scientific.net/KEM.883.11. short: B. Uhe, C.-M. Kuball, M. Merklein, G. Meschut, Key Engineering Materials 883 (2021) 11–18. date_created: 2021-05-31T10:06:11Z date_updated: 2026-02-27T10:23:33Z department: - _id: '157' doi: 10.4028/www.scientific.net/KEM.883.11 intvolume: ' 883' keyword: - Coating - Friction - Joining language: - iso: eng page: 11-18 publication: Key Engineering Materials quality_controlled: '1' status: public title: Influence of the Rivet Coating on the Friction during Self-Piercing Riveting type: journal_article user_id: '53912' volume: 883 year: '2021' ...