DEFINITION D'UN CRITERE DE RUPTURE DUCTILE EN COMPRESSION.

The work described in this paper deals with the effect of the inclusion texture on the instability conditions during compression. The main results concerning the behavior of the matrix-inclusion ensemble and various models of growth of inclusion cavities are reviewed. On the basis of experiments on four grades of XC38 steel with a controlled inclusion content, the authors propose a model of surface growth of inclusion cavities in the equatorial zone of a compression sample. On the basis of tests of several models of ductile fracture, the authors propose a criterion for ductile compressive fracture which is based on the instability conditions at the tip of the inclusion cavity.