Bead-to-Bead Analysis : Introducing an Innovative Methodology for Accelerated Quantitative Analysis of the Welding Behavior of Bead Foams

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00008663
URN to cite this document: urn:nbn:de:bvb:703-epub-8663-4

Title data

Dippold, Marcel ; Himsel, Alexander ; Kuhnigk, Justus ; Chairopoulou, Makrina ; Drexler, Maximilian ; Ruckdäschel, Holger:
Bead-to-Bead Analysis : Introducing an Innovative Methodology for Accelerated Quantitative Analysis of the Welding Behavior of Bead Foams.
In: Journal of Polymer Science. Vol. 63 (2025) Issue 21 . - pp. 4546-4553.
ISSN 2642-4169
DOI der Verlagsversion: https://doi.org/10.1002/pol.20240830

	Format: PDF Name: Journal of Polymer Science - 2024 - Dippold - Bead‐to‐Bead Analysis Introducing an Innovative Methodology for Accelerated.pdf Version: Published Version Available under License Creative Commons BY 4.0: Attribution
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Project information

Project title:	Project's official title Project's id Materialien und Werkstoffe MW-2104-0005 Open Access Publizieren No information
Project financing:	Bayerisches Staatsministerium für Wirtschaft, Landesentwicklung und Energie

Abstract

Performant lightweight components made of bead foams are essential for a sustainable transformation of industry in multiple areas. An in-depth understanding of the welding process is key in reaching maximum mechanical properties. This study presents the novel methodology of Bead-to-Bead analysis, providing a superior way in directly and quantitatively evaluating the welding behavior of bead foams compared with current approaches. Individual beads of expanded polystyrene (EPS) and expanded thermoplastic polyurethane (ETPU) are welded in a rheometer at defined parameters. A subsequent tensile test in combination with the analysis of the welded surface allows the evaluation of shrinkage/softening of the beads during welding and their tensile strength. For EPS, softening of the amorphous material is observed at the beginning of glass transition (~95°C) in addition to an increased welding quality. Residual stresses in ETPU lead to initial shrinkage followed by softening above 140°C. Welding of ETPU starts at 100°C and reaches a maximum at 140°C. The subsequent thermal analysis of the welded beads show the importance of recrystallization processes during cooling due to the formation of new crystalline domains across the bead interfaces. In the absence of such domains, sufficient bonding between beads is not possible.

Further data

Item Type:	Article in a journal
Keywords:	bead foams; EPS; ETPU; welding
DDC Subjects:	600 Technology, medicine, applied sciences > 620 Engineering
Institutions of the University:	Faculties > Faculty of Engineering Science > Chair Polymer Materials > Chair Polymer Materials - Univ.-Prof. Dr.-Ing. Holger Ruckdäschel Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Polymer Materials
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-8663-4
Date Deposited:	11 Nov 2025 09:34
Last Modified:	17 Dec 2025 13:01
URI:	https://epub.uni-bayreuth.de/id/eprint/8663

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