13th International Conference on Fracture June 16–21, 2013, Beijing, China -10- damage model has been used to model the nonlinear response of the bulk material, while an elastoplastic bilinear domain governs the evolution of plasticity for contact tractions. The interphase model has been written in the framework of a thermodynamically consistent theory. State equations and flow rules have been derived and rewritten in a discrete form to be suitable to be used for finite element implementation. Two numerical applications on masonry structural elements have been conducted. In particular a compression test and a diagonal test have been carried out. Ongoing and future efforts are devoted to the introduction of plastic activation functions on the physical interfaces between mortar and block, and to the possibility to introduce a new damage model to catch horizontal fractures also. Acknowledgements The authors acknowledge the financial support given by the Italian Ministry of Education, University and Research (MIUR) under the PRIN09 project 2009XWLFKW_005 , “A multiscale approach for the analysis of decohesion processes and fracture propagation”. References [1] G. Giambanco, S. Rizzo, R. Spallino, Numerical analysis of masonry structures via interface models. Comput. Methods Appl. Mech. Engrg., 190 (2001) 6493-6511. [2] G. Alfano, E. Sacco, Combining interface damage and friction in a cohesive-zone model. Int. J. Numeric. Methods Engrg., 68 (2006) 542-582. [3] I. Einav, G. T. Houlsby, G. D. Nguyen, Coupled damage and plasticity models derived from energy and dissipation potentials. Int. J. Solids Struct., 44 (2007) 2487-2508. [4] M. R. Salari, S. Saeb, K. J. William, S. J. Patchet, R. C. Carrasco, A coupled elastoplastic damage model for geomaterials. Comput. Methods Appl. Mech. Engrg., 193 (2004) 2625-2643. [5] P. B. Lourenco, J. Rots, Multisurface interface model for analysis of masonry structures. Journal Engrg. Mech., 123 (7) (1997) 660-668. [6] A. Spada, G. Giambanco, P. Rizzo, Damage and plasticity at the interfaces in composite materials and structures. Comput. Methods Appl. Mech. Engrg., 198 (2009) 3884-3901. [7] G. Alfano, M. A. Crisfield, Finite element interface models for the delamination analysis of laminated composite: mechanical and computational issues. Int. J. Numer. Meth. Engrg., 50 (2001) 1701-1736. [8] K. William, I. Rhee, B. Shing, Interface damage model for thermomechanical degradation of heterogeneous materials. Comput. Methods Appl. Mech. Engrg., 193 (2004) 3327-3350. [9] H. R. Lofti, P. B. Shing, Interface model applied to fracture of masonry structures. J. Struct. Eng. (ASCE), 120 (1) (1994) 63-80. [10] F. Parrinello, B. Failla, G. Borino, Cohesive-frictional interface costitutive model. Int. J. Solids and Structures, 46 (2009) 2680-2692. [11] G. Giambanco, Z. Mroz, The interphase model for the analysis of joints in rock masses and masonry structures. Mechanica, 36 (1) (2011) 111-130. [12] G. Giambanco, G. Fileccia Scimemi, A. Spada, The interphase element. Comp. Mech., 50 (3) (2012) 353-366. [13] E. Sacco, F. Lebon, A damage-friction interface model derived from micromechanical approach. Int. J. Solids and Structures, 49 (26) (2012) 3666-3680.
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