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Zum Vibrationsschweißen von Polymerwerkstoffen. Prozess – Struktur – Eigenschaften

Welding experiments with a fully-instrumented vibration welding machine show that the vibration process itself can be divided into three phases. The on-line measured parameters, the microstructure and the mechanical behavior of the welds depend on the phase that is reached during welding. Reaching phase V3, microstructure and properties are determined primarily by the weld pressure in that phase and the pressure in the following cooling phase. Welds with high mechanical properties are built up from a typical multilayer structure. They can be produced only if the welding pressure in the stationary phase is low and the pressure in the cooling phase is not changed. The parameters in the first two phases do not affect weld quality. Therefore the welding procedure can be modified. The reason for different weld qualities is deformation processes in the molten layer. These processes can be quantified simply by the maximum elongation rate in the stationary phase of vibration. For high quality welds with multilayer structure, the elongation flow rate must not exceed a critical value. The results can be transferred from polypropylene to other polymers. Fracture mechanics tests show that the long-term behavior can be extrapolated from short-term tests.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Alois Schlarb

Alois Schlarb
Institut für Werkstofftechnik
Universität - Gesamthochschule Kassel

Information

Free keywords: Vibration welding, polypropylene, supermolecular morphology, mechanical properties, long term behavior, fracture mechanics, critical strain rate, high pressure process run-up
Institute / chair: Fachbereich Maschinenbau der Universität – Gesamthochschule Kassel
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein, Prof. Dr.-Ing. Helmut Potente, Prof. Dr.-Ing. Manfred Neitzel
Publication year: 1989
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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