Abstract
Compression tests for the study of plastic deformation of single crystals have been widely used, especially for those materials which are brittle and/or difficult to machine in the form of specimens. The present work was stimulated by unexpected observations of the shape evolution of sapphire specimens after a few per cent deformation by basal slip. The crystals were oriented to avoid rhombohedral twinning, using an orientation quite different from previous studies. Here, the authors examine the shape changes for a parallelepiped specimen subjected to a homogeneous strain in compression; it is based on a simple geometrical approach derived from previous calculations. The key parameters are the initial angle {var_phi}{sub 0} between the slip plane and the compression face and the deformation represented by the homogeneous shear strain {gamma} or the specimen shortening (l/l{sub 0}) (l and l{sub 0} are the final and initial lengths).
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