Discrete simulation of defect flows and fragmentation of 2D interfaces under contact interaction

D. D. Moiseenko, S. V. Panin, E. N. Iriskina, P. V. Maksimov, S. N. Kupriyanov, I. G. Goryacheva

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The paper is devoted to multiscale computer modelling of defect flows along interfaces in loaded solids. Interfaces are considered as 2D self-organized subsystems. Discrete approach of stochastic excitable cellular automata (SECA, [1, 2]) was extended by adding of special algorithm of astable cellular automata (ACA) to simulate defect propagation and microcrack nucleation. SECA method provides 3D-modelling at mesoscale and it takes into account grain structure of the material; the ACA provides microscale simulations of 2D interface behaviour. Microcrack is considered as a specific "phase state" of local material volume. Defect flows are controled by specific "driving force" calculated from the values of material torsion, couple forces and hydrostatic pressures distributed at the interface. Numerical experiments of fragmentation and fracture in 2D interface show quasiperiodic cyclic character of microcrack nucleation and defect propagation. Computer simulation method based on excitable cellular automata allowed revealing undetected effects in the form of propagation of spiral waves in specimen under indentation. It is shown that rotational wave flows of defects are able to cause forming of quasiperiodical defect structures along the interface.

Original languageEnglish
Title of host publication19th European Conference on Fracture
Subtitle of host publicationFracture Mechanics for Durability, Reliability and Safety, ECF 2012
PublisherEuropean Conference on Fracture, ECF
ISBN (Print)978-5-905576-18-8
Publication statusPublished - 1 Jan 2012
Event19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 - Kazan, Russian Federation
Duration: 26 Aug 201231 Aug 2012

Conference

Conference19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012
CountryRussian Federation
CityKazan
Period26.8.1231.8.12

Keywords

  • 2D interfaces
  • CA simulation
  • Contact interaction
  • Fracture

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality

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