Symplectic Analysis of Wrinkles in Elastic Layers with Graded Stiffnesses

Jianjun Sui, Junbo Chen, Xiaoxiao Zhang, Guohua Nie, Teng Zhang

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Wrinkles in layered neo-Hookean structures were recently formulated as a Hamiltonian system by taking the thickness direction as a pseudo-time variable. This enabled an efficient and accurate numerical method to solve the eigenvalue problem for onset wrinkles. Here, we show that wrinkles in graded elastic layers can also be described as a time-varying Hamiltonian system. The connection between wrinkles and the Hamiltonian system is established through an energy method. Within the Hamiltonian framework, the eigenvalue problem of predicting wrinkles is defined by a series of ordinary differential equations with varying coefficients. By modifying the boundary conditions at the top surface, the eigenvalue problem can be efficiently and accurately solved with numerical solvers of boundary value problems. We demonstrated the accuracy of the symplectic analysis by comparing the theoretically predicted displacement eigenfunctions, critical strains, and wavelengths of wrinkles in two typical graded structures with finite element simulations.

Original languageEnglish (US)
Article number0110081
JournalJournal of Applied Mechanics, Transactions ASME
Volume86
Issue number1
DOIs
StatePublished - Jan 1 2019

Keywords

  • eigenvalue analysis
  • gradient structures
  • neo-Hookean
  • symplectic
  • wrinkles

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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