Plasticity of random inhomogeneous media

Research output: Contribution to journalConference article

Abstract

Effects of spatial random fluctuations in the yield condition are analyzed in rigid-perfectly plastic media governed, generally, by a Mohr-Coulomb yield condition with cohesion. The solution method is based on a stochastic generalization of the method of slip-lines, whose significant feature is that the deterministic characteristics are replaced by the forward evolution cones containing random characteristics; the actual choice of spacing of a finite difference net of slip-lines defines the mesoscale approximation in any given problem. Comparisons of response of this random medium and of a deterministic homogeneous medium, with a plastic limit equal to the average of the random one, are carried out numerically in several examples of boundary value problems; finite difference methods appropriate for inhomogeneous materials are developed. The major conclusion is that weak material randomness may lead to a relatively stronger scatter in the position and field variables as well as to a larger size of the domain of dependence - effects which are amplified by both, presence of shear traction and inhomogeneity in the boundary data.

Original languageEnglish (US)
Pages (from-to)123-132
Number of pages10
JournalAmerican Society of Mechanical Engineers, Applied Mechanics Division, AMD
Volume200
StatePublished - Jan 1 1995
Externally publishedYes
EventProceedings of the 1995 Joint ASME Applied Mechanics and Materials Summer Meeting - Los Angeles, CA, USA
Duration: Jun 28 1995Jun 30 1995

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Plasticity
Plastics
Finite difference method
Boundary value problems
Cones

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Plasticity of random inhomogeneous media. / Ostoja-Starzewski, M.; Ilies, H.

In: American Society of Mechanical Engineers, Applied Mechanics Division, AMD, Vol. 200, 01.01.1995, p. 123-132.

Research output: Contribution to journalConference article

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