This computational modeling study reveals stress dynamics in polycrystals, suggesting enhanced understanding of creep behavior at grain boundaries.
A microstructurally-based modeling technique is used to study the intergranular failure in random polycrystals in terms of unit cell calculations involving many grains. The polycrystal is represented by means of special grain-elements. These elements account for elasticity and power-law creep in the grains, while interface elements take care of cavitation and free sliding at the grain boundaries. To incorporate the strain rate enhancement caused by free grain boundary sliding, we make use of a geometry-dependent stress enhancement factor in the creep law for the grain-element. First, full-field finite element calculations are carried out to correlate the stress enhancement factor with the geometry of the microstructure. Subsequently, these results are used in the grain-elements approach to investigate the influence of microstructural variations on creep rupture in much larger aggregates.
No takes yet. Share an insight, caveat, or question.
Onck et al. (1995) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: