Simulation of intergranular crack nucleation and evolution in polycrystal metals on mesoscale

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DOIResolve DOI: http://doi.org/10.2495/CMEM110521
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TypeArticle
Proceedings titleWIT Transactions on Modelling and Simulation
Conference15th International Conference on Computational Methods and Experimental Measurements, CMEM 2011, 31 May 2011 through 2 June 2011, New Forest
ISSN1743-355X
ISBN9781845645403
Volume51
Pages589600; # of pages: 12
SubjectCohesive zone model; Finite element models; Grain boundary fracture; Grain-boundary misorientations; Intergranular crack; Mesoscale; Microstructural geometry; Two-dimensional grains; Computational methods; Cracks; Crystal microstructure; Geometry; Grain boundaries; Grain size and shape; Nucleation; Polycrystals; Textures; Two dimensional; Finite element method
AbstractThis paper presents research on the development of a simulation method for the study of the mechanisms of intergranular crack nucleation and propagation in polycrystal metals on the mesoscale. Microstructural geometry models were built randomly using Voronoi techniques. Based on these grain structure geometry models, two-dimensional grain structure finite element models were created using a Patran Command Language (PCL) program. Techniques for the implementation of the cohesive elements between grain boundaries were developed in PCL for the generation of two-dimensional cohesive models. Simulations on intergranular crack nucleation and evolution along grain boundaries using two-dimensional finite element cohesive models were carried out on the mesoscale level. Several aspects that affect the crack nucleation and propagation were studied, which included random grain geometries, grain boundary misorientations, grain boundary peak strength, grain boundary fracture energy, grain properties, and grain plasticity. The simulations demonstrated that the cohesive model is a useful and efficient modeling tool for the study of the intergranular crack nucleation and evolution on the mesoscale level. The simulation results showed that the factors studied have large impacts on intergranular crack nucleation and evolution based on the current model capabilities and conditions. © 2011 WIT Press.
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LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271245
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Record identifierefc9fb5b-7851-4d68-abf5-a33329223de9
Record created2014-03-24
Record modified2016-05-09
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