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Micromechanical modeling of cohesive thermoelastic steady‐state and transient cracking in polycrystalline materials
Author(s) -
Geraci G.,
Aliabadi M. H.
Publication year - 2018
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.5997
Subject(s) - thermoelastic damping , materials science , isotropy , brittleness , intergranular corrosion , mechanics , voronoi diagram , finite element method , cracking , slip (aerodynamics) , nonlinear system , crystallite , boundary element method , structural engineering , composite material , microstructure , thermal , metallurgy , geometry , thermodynamics , engineering , physics , mathematics , quantum mechanics
Summary In this paper, a micromechanical formulation is proposed for modeling thermoelastic intergranular and transgranular damage and microcracking evolution in brittle polycrystalline materials. The model is based on a multiregion boundary element approach combined with the dual boundary element formulation. Polycrystalline microstructures are created through a Voronoi tessellation algorithm. Each crystal has an elastic isotropic behavior, and multiphase aggregates have been considered. Damage evolution along (intergranular or transgranular) interfaces is modeled using thermomechanical cohesive laws, and upon failure, nonlinear frictional contact analysis is introduced to model separation, stick or slip. Steady‐state and transient thermoelastic formulations have been modeled, and numerical simulations are presented, not only to demonstrate the validity but also to study the physical implications of the proposed formulation, in comparison with other numerical methods as well as experimental observations and literature results.