Nonlinear viscoelastic stress singularities near free edges of unsymmetrically laminated composites

Sung Yi, M. Fouad Ahmad, Harry H. Hilton

Research output: Contribution to journalArticlepeer-review

Abstract

Nonlinear viscoelastic stress singularities near free edges of laminated composites are evaluated based on Pipes and Pagano's displacement field for laminates under a generalized plane deformation state and Schapery's nonlinear viscoelastic constitutive relations. The interlaminar stresses in unsymmetrically laminated composites due to axial strain and bending have been studied as a function of time and loading magnitude. Numerical studies show that the stacking sequence significantly affects the distributions of interlaminar stresses and the stress symmetric conditions about the midplane for an unsymmetrically laminated composite are different than those for a symmetric laminate. The results indicate a strong sensitivity to the nonlinearities of the viscoelastic constitutive relations. Increasing the load significantly increases nonlinear behavior. The rate of stress relaxation also varies with the magnitude of loading.

Original languageEnglish (US)
Pages (from-to)3221-3237
Number of pages17
JournalInternational Journal of Solids and Structures
Volume35
Issue number24
DOIs
StatePublished - Aug 1998

ASJC Scopus subject areas

  • Modeling and Simulation
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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