Étude expérimentale de l'hétérogénéité de la déformation lors de l'essai de la compression plane de monocristauxExperimental study of the inhomogeneous deformation in the plane strain compression test of single crystals

In this paper, associated to a previous work, we present an experimental analysis of the channel die compression test. The channel die test occupies an important position within single crystal deformation studies and has been viewed as representing a first approximation to the constrain and loading condition for metal polycrystals. The latter is frequently found in plastic working operations such as rolling, deep drawing and wire flattening. In this test, where the walls of a channel supress lateral flow, the lateral stress developped at the walls varies with the crystal orientation and with the conditions of friction. We adress the conflict between ideal frictionless walls under the assumption of a uniform deformation of an anisotropic material. On the basis of prior results, three crystals of cubic structure to faces centered of various orientations were forced under conditions of extreme lubrifications. Such tests make it possible to confirm the previous theorical predictions by an analysis of the heterogeneous behaviour of the deformation.