Issue 29

R. Dimitri et alii, Frattura ed Integrità Strutturale, 29 (2014) 266-283; DOI: 10.3221/IGF-ESIS.29.23 273 (a) Normal direction (b) Tangential direction (c) Normal direction (d) Tangential direction Figure 6 : Coupling effect on stresses for CZM 4, PL criterion:. g Nu /g Nmax =2exp(1), g Tu /g Tmax =2√exp(1) for pure modes I and II (a) , (b) ; g Nu /g Nmax =exp(1), g Tu /g Tmax =√exp(1) for pure modes I and II (c) , (d) .  =0.5. (a) Normal direction (b) Tangential direction (c) Normal direction (d) Tangential direction Figure 7 : Coupling effect on stresses for CZM 4, BK criterion:. g Nu /g Nmax =2exp(1), g Tu /g Tmax =2√exp(1) for pure modes I and II (a) , (b) ; g Nu /g Nmax =exp(1), g Tu /g Tmax =√exp(1) for pure modes I and II (c) , (d) .  =1.75.