Issue 18

S. Marfia et alii, Frattura ed Integrità Strutturale, 18 (2011) 23-33; DOI: 10.3221/IGF-ESIS.18.03 33 softening behavior is only governed by the evolution of the interface damage. On the other hand, in the results obtained considering the Model 2, the softening behavior is strongly influenced by the body damage during the whole detachment process, also when the interface damage becomes to develop and the body damage does not evolve anymore. Thus, the degradation process results faster for the Model 2 than for the Model 1. Moreover, the numerical application show also the differences between the response of the coupled and uncoupled interface model. In particular, the results obtained using the coupled model appears much more reasonable and, as a consequence, more reliable with respect to the one obtained adopting the uncoupled damage model, as it does not suffer from the physical unacceptable effect found in the uncoupled one. R EFERENCES [1] N. Plevris, T.C. Triantaffilou, D. Veneziano, Journal of Structural Engineering ASCE 121, (1995) 1037. [2] T.C. Triantafillou, M.N. Fardis, Materials and Structures, 30 (1997) 486. [3] M. R. Valluzzi, M. Valdemarca, C. Modena, Journal of composites for constructions ASCE (2001) 163. [4] S. Marfia, E. Sacco, International Journal of Solids and Structures, 38 (2001) 4177. [5] N. Galati, G. Tumialan, A. Nanni, Construction and Building Materials, 20 (2006) 101. [6] B. Ferracuti, M. Savoia, C. Mazzotti, Composites: Part B, 37 (2006) 356. [7] F. Freddi, M. Savoia, Engineering Fracture Mechanics, 75 (2008) 1666. [8] E. Grande, G. Milani, E. Sacco, Engineering Structures, 30 (2008) 1842. [9] F. Fouchal, F. Lebon, I. Titeux, Construction and Building Materials, 23 (2009) 2428. [10] F. Freddi, M. Fremond, Journal of Mechanics of Materials and Structures, 7 (2006) 1205. [11] S. Marfia, E. Sacco, J. Toti, A coupled interface-body nonlocal damage model for FRP strengthening detachment, In print on Computational Mechanics (2011). [12] Mazars J, Pijaudier-Cabot G Continuum damage theory: application to concrete. Journal of Engineering Mechanics, ASCE, 115 (1989) 345. [13] G. Alfano, E. Sacco, International Journal For Numerical Methods in Engineering, 68 (2006) 542. [14] E. Sacco, J. Toti, International Journal for Computational Methods in Engineering Science and Mechanics, 11 (2010) 354. [15] O.C. Zienkiewicz, R. L. Taylor The Finite Element Method, 4 th edn. McGraw-Hill, London, (1991). [16] E. Grande, M. Imbimbo, E. Sacco, Journal of Composites Part B: Engineering, 42 (2011) 330.