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Design and dimensioning of truck leaf springs made of glass fibre reinforced plastics

For the reduction of vehicle mass, especially the springless masses of commercial vehicles, attempts are being made to replace the traditional heavy steel leaf springs by lighter springs made of glass fibre reinforced plastics (FRP). Unidirectional FRP (UD-FRP) is an ideal material for leaf springs because it has a very high strain at failure and high strength, low density and an acceptable market price. - This paper presents a comprehensive guide for the design and dimensioning of such extremely anisotropic UD-FRP leaf springs. Design guidelines for a load transmission area at the center of the spring and the spring eyes are derived from numerous fatigue tests with FRP leaf springs. - For the first time a newly developed wedge spring is presented. It has a constant width and a linear thickness profile. The cross-section area of the fibre bundles is constant in the wedge spring; the linear thickness profile is realized by a variable proportion of resin over the length. The wedge spring can easily be manufactured by a fibre pulling/pressing process using low priced rovings and presents, in economic terms, an adequate alternative to the FRP parabolic spring.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Timo Götte

Timo Götte
Fachgebiet Faserverbundtechnik/Konstruktionstechnik
Universität - Gesamthochschule Kassel

Information

Free keywords: Design of glass fibre composite leaf springs - truck leaf springs – types of leaf springs – fatigue test – design of spring eyes – design of restraint – wedge leaf – glass fibre reinforced plastics (FRP) – kind of damage at FRP leaf springs – stress analysis
Institute / chair: Fachbereich Maschinenbau der Universität - Gesamthochschule Kassel
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. A. Puck (Betreuer), Prof. Dr.-Ing. G. W. Ehrenstein
Publication year: 1988
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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