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Vibration joining of fibre reinforced thermosets by abrasive hotmelts based on polyamide 6

The vibration joining process is a modification of holt-melt bonding, which melts the thermoplastic hot melt and creates the joint to the substrate with the help of the vibratory motion of a vibration welding machine. Abrasive fillers added to the thermoplastic, e.g. glass fibres or aluminium oxide, cause a roughening of the substrate surface. Parts of the substrate reinforcement are exposed. The molten thermoplastic can penetrate these fibres and undercuts to build up a clawing structure. This leads to an increase in the joints tensile strength compared to conventionally bonded hot-melt joints.

The influence of thermoplastic fillers and the viscosity of the thermoplastic on the formation and the strength of the joint were investigated in this work. A supplementary FEM analysis was carried out to estimate the heating rates of the thermoplastic by internal and external friction in the early process phases. The fillers show a high influence on the joint strength. For every filler used a critical mass fraction exists that leads to the development of the described abrasion and to the strength improving effect of clawing. Lubricating fillers like carbon black or glass beads decrease the abrasion effect and lead to a lower joint strength.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Tobias Beiß

Tobias Beiß

Information

Free keywords: Vibration joining of fibre reinforced thermosets by abrasive hotmelts based on polyamide 6
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein (Betreuer), Prof. Dr.-Ing. Michael Gehde
Publication year: 2009
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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