Nonlinear buckling of a spherical shell embedded in an elastic medium with imperfect interface

A. Shams, M. Aureli, Maurizio Porfiri

Research output: Contribution to journalArticle

Abstract

This work analyzes nonlinear buckling of a single spherical shell imperfectly bonded to an infinite elastic matrix under a compressive remote load. The inclusion is modeled using a nonlinear shell formulation and the matrix is treated as a linear elastic body. Imperfect bonding conditions are realized through a linear spring interface model. A variational method is used to derive the governing differential equations, which are cast into a tractable set of nonlinear algebraic equations using the Galerkin method. An incremental iterative technique based on the modified Newton-Raphson method is employed to find the critical load of the system. The accuracy and convergence properties of the proposed method are validated through finite element analysis. The study is relevant to the analysis of compressive failure of syntactic foams used in marine and aerospace applications. Results are specialized to glass particle-vinyl ester matrix syntactic foams to test the hypothesis as to whether microballoons' buckling is a dominant failure mechanism in such composites under compression. Parametric studies are conducted to understand the effect of interfacial properties and inclusion wall thickness on the overall mechanical behavior of the composite. Comparisons between analytical findings and experimental results on compressive response of syntactic foams and isolated microballoons indicate that inclusion buckling is unlikely a determinant of compressive failure in vinyl ester-glass systems. In particular, the matrix is found to exert a beneficial stabilizing effect on the inclusions, which fail under brittle fracture before the onset of buckling.

Original languageEnglish (US)
Pages (from-to)2310-2327
Number of pages18
JournalInternational Journal of Solids and Structures
Volume50
Issue number14-15
DOIs
StatePublished - Jul 2013

Fingerprint

Imperfect Interface
Spherical Shell
elastic media
spherical shells
buckling
Buckling
Foam
Syntactics
Inclusion
microballoons
foams
inclusions
Foams
matrices
esters
Esters
Composite
Newton-Raphson method
Marine applications
elastic bodies

Keywords

  • Buckling
  • Composite materials
  • Interface
  • Particulate media
  • Shell
  • Syntactic foam

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Applied Mathematics
  • Modeling and Simulation

Cite this

Nonlinear buckling of a spherical shell embedded in an elastic medium with imperfect interface. / Shams, A.; Aureli, M.; Porfiri, Maurizio.

In: International Journal of Solids and Structures, Vol. 50, No. 14-15, 07.2013, p. 2310-2327.

Research output: Contribution to journalArticle

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