The numerical model of dynamic mechanical behavior of brittle materials based on the concept of the kinetic theory of strength

Aleksandr S. Grigoriev, Evgeny V. Shilko, Vladimir A. Skripnyak, Aleksandr G. Chernyavsky, Sergey G. Psakhie

Research output: Contribution to journalArticle

Abstract

A model of the dynamic mechanical behavior of brittle materials based on the ideas of the kinetic theory of strength is developed. The proposed model is a generalization of the classical "quasi-static" Nikolaevsky plasticity model (non-associated flow law with the plasticity criterion in the form of Mises-Schleicher) to the strain rate interval corresponding to the dynamic loading. In contrast to the traditional approach to constructing dynamic models, in which the dependence of the model parameters on the strain rate is specified, the proposed model suggests to use the relaxation time and time of fracture as the key parameters. The presented model allows taking into account the change in the strength and rheological properties of brittle materials with an increase in the loading rate. This ensures a correct transition from the quasi-static regime of loading to the dynamic one in the range of strain rates within 10-3 < ε < 103 s-1. Within the framework of the proposed model it is assumed that there exist the experimental data about the dependences of the strength and rheological characteristics of the material on the times of different scales discontinuities nucleation. However, in view of the complexity of obtaining this information, we propose a way of obtaining the estimates of these dependencies by transforming the dependences of the mechanical properties on the strain rate that can be gained with standard tests. The developed dynamic model can be implemented within various Lagrangian numerical methods using an explicit integration scheme (including the finite element and discrete element methods) and is relevant for solving a new class of applied problems related to natural and technogenic dynamic impacts to structures of artificial building materials, including concretes, ceramic elements of structures and natural rock materials.

Original languageEnglish
Pages (from-to)75-99
Number of pages25
JournalPNRPU Mechanics Bulletin
Issue number3
DOIs
Publication statusPublished - 1 Jan 2017

Fingerprint

Kinetic theory
Brittleness
Numerical models
Strain rate
Plasticity
Dynamic models
Finite difference method
Relaxation time
Numerical methods
Nucleation
Rocks
Concretes
Mechanical properties

Keywords

  • Brittle materials
  • Dynamic loading
  • Fracture
  • Fracture time
  • Inelastic behavior
  • Kinetic theory of strength
  • Lagrangian numerical methods
  • Mathematical model
  • Movable cellular automata method
  • Relaxation time
  • Strain rate

ASJC Scopus subject areas

  • Computational Mechanics
  • Materials Science (miscellaneous)
  • Mechanics of Materials

Cite this

The numerical model of dynamic mechanical behavior of brittle materials based on the concept of the kinetic theory of strength. / Grigoriev, Aleksandr S.; Shilko, Evgeny V.; Skripnyak, Vladimir A.; Chernyavsky, Aleksandr G.; Psakhie, Sergey G.

In: PNRPU Mechanics Bulletin, No. 3, 01.01.2017, p. 75-99.

Research output: Contribution to journalArticle

Grigoriev, Aleksandr S. ; Shilko, Evgeny V. ; Skripnyak, Vladimir A. ; Chernyavsky, Aleksandr G. ; Psakhie, Sergey G. / The numerical model of dynamic mechanical behavior of brittle materials based on the concept of the kinetic theory of strength. In: PNRPU Mechanics Bulletin. 2017 ; No. 3. pp. 75-99.
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