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Stress-, Strain- and Failure Analysis of Thick Walled Tubular Structures Made of Fibre-Polymer Composites

Currently even relatively thick-walled tubular structures made of fiber-reinforced plastics (FRP) are dimensioned using the classical laminate theory for thin-walled shell structures. In the present paper analytical solutions for thick-walled tubes are developed for several loading cases including: internal or external pressure, axial forces, torsion, temperature changes, bending without shear force and bending at constant shear force. In comprehensive parameter studies it is shown that generally the CLT is sufficient up to a ratio of 1.2 between outer and inner radius. Thin-layered tubes with favorable fiber orientation show the best agreement between thin and thick theory. In contrast to the above the differences for tubes under torsion with only one layer are unacceptable high. The frequently mentioned interlaminar shear and normal stresses can now be quantified. The short computation time of analytical solutions makes it possible to use numerical optimization methods for thick-walled FRP components that where not applicable with finite element methods.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Reinhard Jakobi

Reinhard Jakobi
Faserverbundtechnik/Konstruktionstechnik
Universität - Gesamthochschule Kassel

Information

Free keywords: Fibre-polymer-composites - thick walled tubular structures - analytical solutions - axial symmetric loading - internal stresses - 3D-stress state - anisotropic material behaviour - radii ratio, allowable limit - optimization of torsional tubes
Institute / chair: Fachbereich Maschinenbau der Universität - Gesamthochschule Kassel
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. A. Puck (Betreuer), Prof. Dr.-Ing. O. T. Bruhns
Publication year: 1987
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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