Viscoelastic functionally graded finite element method with recursive time integration and applications to flexible pavements

Eshan V. Dave, Glaucio H. Paulino, William G. Buttlar

Research output: Contribution to journalArticlepeer-review

Abstract

The finite-element (FE) method is used for modeling geotechnical and pavement structures exhibiting significant non-homogeneity. Property gradients generated due to non-homogeneous distributions of moisture is one such example for geotechnical materials. Aging and temperature-induced property gradients are common sources of non-homogeneity for asphalt pavements. Investigation of time-dependent behavior combined with functionally graded property gradation can be accomplished by means of the non-homogeneous viscoelastic analysis procedure. This paper describes the development of a generalized isoparametric FE formulation to capture property gradients within elements, and a recursive formulation for solution of hereditary integral equations. The formulation is verified by comparison with analytical and numerical solutions. Two application examples are presented: the first describes stationary crack-tip fields for viscoelastic functionally graded materials, and the second example demonstrates the application of the proposed procedures for efficient and accurate simulations of interfaces between layers of flexible pavement.

Original languageEnglish (US)
Pages (from-to)1194-1219
Number of pages26
JournalInternational Journal for Numerical and Analytical Methods in Geomechanics
Volume36
Issue number9
DOIs
StatePublished - Jun 25 2012

Keywords

  • Flexible pavements
  • Generalized isoparametric formulation (GIF)
  • Hereditary integrals
  • Viscoelastic functionally graded materials (VFGM)
  • Viscoelasticity

ASJC Scopus subject areas

  • Computational Mechanics
  • Materials Science(all)
  • Geotechnical Engineering and Engineering Geology
  • Mechanics of Materials

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