Stresses at grain boundaries
The maximum incompatibility stress in an infinitely extended elastic bicrystal under uniaxial loading
Kai Liu (TU Delft - Team Marcel Sluiter)
Marcel Sluiter (Universiteit Gent, TU Delft - Team Marcel Sluiter)
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Abstract
In a material under stress, grain boundaries may give rise to stress discontinuities. Stress localization is crucial to materials' behavior such as segregation, precipitation, and void nucleation. Here, the stress state at a grain boundary perpendicular to a uniaxial external stress is studied systematically. The grain boundary with the most extreme stress discontinuity is determined for cubic materials within the elastic limit for a bicrystal model. Additionally, grain boundaries with negligible stress discontinuity are identified. The influence of the elastic tensor components, C11, C12, and C44, and grain orientation is studied quantitatively.