Issue 38

A. Znaidi et alii, Frattura ed Integrità Strutturale, 38 (2016) 135-140; DOI: 10.3221/IGF-ESIS.38.18 139 Figure 1 : Identification of the hardening curve :  = 00°. f g h n’ m 0.137 0.0992 1.4889 3.104 1.1999 Table 4 : Identification of anisotropic coefficients and a shape coefficient m In Fig. 2 the model (ident) allows us to study the load surface on each test. We note that this material is resistant to simple shear like simple traction. Figure 2 : Evolution of the load surface in the deviatory plan   x x 2 3 , . Figure 3 : Evolution of the anisotropy. 0,5 0,7 0,9 1,1 0 0,4 0,8 1,2 1,6  