The influence of Lüders front propagation on the strength of the "coating-substrate" composite. Numerical simulation

Ruslan Revovich Balokhonov, V. A. Romanova, S. Schmauder, E. A. Schwab, S. A. Martynov

Research output: Contribution to journalArticle

Abstract

Processes of propagation of localized plastic deformation fronts in a material with boride coating have been investigated. The boundary-value dynamic problem is solved in the plane-strain formulation. Numerical simulation is performed by the finite-difference method. In calculations the microstructure of the composite is taken into account explicitly and corresponds to that observed experimentally. The constitutive equations for the steel substrate include an elastoplastic model with isotropic strain hardening taking into account a relation to describe slow flows. Deformation and fracture of the coated material under external compression is shown to be controlled by the appearance of local regions of tension along the interface. An interaction and interplay between nonhomogeneous plastic deformation in the steel substrate and crack origination and growth in the coating are studied. Cracking patterns, location of the fracture onset, and volume fraction of failed material are found to depend on the velocity of Lüders front propagation.

Original languageEnglish
Pages (from-to)283-305
Number of pages23
JournalComposites: Mechanics, Computations, Applications
Volume3
Issue number4
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • Coated materials
  • Lüders bands
  • Numerical simulation

ASJC Scopus subject areas

  • Mechanics of Materials
  • Ceramics and Composites

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