Grain Boundary Modeling Issues with Cohesive Elements: Application to Intergranular Stress Corrosion Cracking.
This work highlights some of the issues regarding the application of the cohesive elements for modeling grain boundaries
with the purpose of capturing intergranular stress corrosion cracking in polycrystalline aggregates. The main
issue relates to the computation of the normal stresses which at the triple lines between the grain boundaries deviate
from the theoretically computed values for a homogeneous, isotropic material. The issues is found in both 3D type
cohesive elements in ABAQUS: COH3D6 and COH3D8. Both conformal and non-conformal meshes were investigated
and the issues is observed in both. Also, the effect of different structural elements and different mesh densities
was investigated. Quite small influence of both was found. The only instance where the computed normal stresses
agree well with the theoretical is in the case of a very simple geometry with a conformal and completely symmetric
mesh. This kind of mesh is practically impossible to obtain in the real steel structure. The applicability of the cohesive
elements in this type of application is therefore questionable.
SIMONOVSKI Igor;
MACHINA Gangadhar;
2012-09-10
Publications Office of the European Union
JRC68140
978-92-79-22607-6 (print),
978-92-79-22608-3,
1018-5593 (print),
1831-9424 (online),
EUR 25144 EN,
OP LD-NA-25144-EN-C (print),
OP LD-NA-25144-EN-N (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC68140,
10.2790/40313 (print),
10.2790/40327 (online),
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