Non-linear modes of vibration of thin cylindrical shells in composite laminates with curvilinear fibres

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Pedro Leal Ribeiro (Author) FEUP

Journal

Title: Composite Structures

Vol. 122

Pages: 184-197

ISSN: 0263-8223

Publisher: Elsevier

Indexing

ISI Web of Knowledge

ISI Web of Science

Scopus - 1 Citation

Scientific classification

CORDIS: Technological sciences > Engineering > Mechanical engineering > Vibration engineering ; Technological sciences > Engineering > Materials engineering

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-00A-20C

DOI: 10.1016/j.compstruct.2014.11.019

Abstract (EN): A formulation applicable to free, periodic, geometrically non-linear vibrations of thin shallow shells made of composite layers with curvilinear fibres is presented. The modes of vibration of this type of Variable Stiffness Composite Laminated (VSCL) shallow shells are examined in the non-linear regime. Due to the membrane effects and their coupling with bending, the modes of vibration of VSCL shells are more affected by alterations in the curvilinear fibre paths than what was previously found to occur in plates. Indeed, it is discovered that by changing one of the parameters that defines the fibre path - keeping all other properties of the shells unaltered - the degree of softening can be changed, hardening can become softening, the vibration displacement amplitude at which turning points occur can change and the amplitudes of harmonics vary. A significant deduction, which results from the numerical tests, is that modes of vibration that have mode shapes with more half-waves are less likely to experience softening. A geometric explanation for this behaviour, which does not apply only to VSCL shells, is given. © 2014 Elsevier Ltd.

Language: English

Type (Professor's evaluation): Scientific