MODELLING OF ELASTIC-PLASTIC DEFORMATION OF POLYCRYSTALLINE AND COMPOSITE MATERIALS UNDER LOADING V.N. LEYCIN, P.V. MAKAROV, A.P. NIKOLAEV et I.Y. SMOLIN J. Phys. IV France, 01 C3 (1991) C3-949-C3-954 DOI: 10.1051/jp4:19913134