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Abstract
Grain-boundary diffusional creep in a polycrystalline array of orthorhombic-shaped grains under the influence of three axially aligned principal stresses is analysed numerically. The vacancy concentration under steady-state diffusion conditions is calculated over the grain surfaces and the anisotropy of the creep rate resulting from variations in the grain shape and the applied stress system is evaluated. The numerical method is validated by comparison with analytical solutions that exist for certain limiting cases. The results are compared with the relationships suggested by Greenwood in 1992.