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Direct Processing of Long Fiber Reinforced Thermoplastic Composites and their Mechanical Behavior under Static and Dynamic Load

The mechanical behavior of fiber reinforced thermoplastic composites is mainly influenced by fiber length. However, fiber length is strongly reduced during processing. For this reason direct processing techniques are increasingly applied in order to avoid fiber fracture and thus to generate composites with long fibers.

This work investigates the influence of fiber length especially on fatigue behavior of thermoplastic composites. In doing so the processing influences on fiber length of polypropylene and polyamide 66 based composites during injection molding compounding were analyzed and quantified. Consequently it becomes possible to directly influence fiber length in the composite. Comprehensive analysis of static properties of composites with different average fiber lengths shows the impact of aspect ratio on both, stiffness and strength. The models of Halpin and Tsai and Kelly and Tyson allow the approximation of modulus and tensile strength. Subsequent dynamic hysteresis measurements were done in order to define an exponential approach for the prediction of the influence of fiber length on fatigue properties.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Melanie Rohde-Tibitanzl

Melanie Rohde-Tibitanzl
Lehrstuhl für Polymere Werkstoffe
Universität Bayreuth

Information

Free keywords: Fiber reinforced thermoplastic composites, direct processing, Injection Molding Compounder, fiber length degradation, fiber length, mechanical properties, static properties, dynamic properties, fatigue
Institute / chair: Fakultät für Ingenieurwissenschaften der Universität Bayreuth
Language: English
Technical consultant for expert services: Prof. Dr.-Ing. Volker Altstädt (Betreuer), Prof. Dr.-Ing. Dietmar Drummer
Publication year: 2015
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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