On inconstant Poisson's ratios in non-homogeneous elastic media

Kamran A. Khan, Harry H. Hilton

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


For non-homogeneous linear elastic materials, it is demonstrated that even for the simplest loading case, i.e. quasi-static uniaxial, the Poisson's ratio (PR) is space dependent and not a constant. Furthermore, the assumption of constant PR values or of separable temporal and spatial PR functions leads to ill-posed overdetermined problems. Additionally, elastic PRs become space and time dependent under time dependent stresses in non-homogeneous elastic media. Under these and more general circumstances, PRs cannot be considered material property descriptors since they now become functions of the spatially changing moduli and stresses, and vary accordingly. The same conclusions are also drawn for nonlinear elastic media with small or large deformations.

Original languageBritish English
Pages (from-to)29-36
Number of pages8
JournalJournal of Thermal Stresses
Issue number1
StatePublished - Jan 2010


  • Anisotropic materials
  • Elasticity
  • Functionally graded materials
  • Non-homogeneity
  • Poisson's ratios
  • Viscoelastic implications


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