DYNAMIC BUCKLING OF IMPERFECTION-SENSITIVE SHELL STRUCTURES.

Sunil Saigal, T. Y. Yang, Rakesh K. Kapania

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Structural buckling under dynamic loads may occur at load levels that are less than the corresponding static loads. Presence of local geometric imperfections may induce an early buckling for both static and dynamic loadings. The phenomenon of 'dynamic weakening' is studied for a general class of shell structures under a general class of time-dependent loadings. A doubly curved quadrilateral Love-Kirchhoff shell finite element is used. Geometric deviations of the shell middle surface are included within the element formulation by suitably modifying the strain-displacement relations. This is accomplished by retaining additional terms that are quadratic in spatial derivatives of imperfections and displacement components. The nonlinear equations of motion are written in the Lagrangian system and are solved by using an incremental algorithm based on Newmark's generalized operator. The dynamic responses up to buckling are obtained for a perfect spherical cap and an imperfect spherical cap both under external pressure, as well as a complete imperfect sphere under external pressure.

Original languageEnglish (US)
Pages (from-to)719-724
Number of pages6
JournalJournal of Aircraft
Volume24
Issue number10
StatePublished - Oct 1 1987
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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