Donald J Weidner and Li Li 2006 J. Phys.: Condens. Matter 18 S1061 doi:10.1088/0953-8984/18/25/S12
Donald J Weidner1 and Li Li
Show affiliationsStress analysis in polycrystalline materials reveals that stress can vary considerably among different subpopulations of grains. Samples of MgO and mixtures of MgO and spinel have been studied. After the onset of plastic flow, stronger grains or orientations will support more stress than the weaker grains. A grain to grain fabric develops that enables this stress partitioning. The stress partitioning and the resulting fabric can invalidate static measurements of elastic moduli. However, high temperature flow mechanisms reveal a more isotropic strength behaviour resulting in a more uniform variation of stress with orientation.
62.20.F- Deformation and plasticity
81.40.Jj Elasticity and anelasticity, stress-strain relations
81.40.Lm Deformation, plasticity, and creep
Issue 25 (28 June 2006)
Received 6 March 2006, in final form 1 May 2006
Published 8 June 2006
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