Hysteresis, Damage and Moisture Effects in Quasi-Brittle Porous Materials (Hysteresis, schade en vocht invloeden in quasi-brosse poreuze materialen)
Hysteresis, Damage and Moisture Effects in Quasi-Brittle Porous Materials
Mertens, Stijn; S0029338
When a civil-engineering material like concrete, rock is subjected to amechanical loading, a nonlinear hysteretic behavior is observed. Experiments have shown that this behavior is caused by the bond system (e.g. ITZ in concrete). Cracking occurs in the bond system and the matrix, therefore it changes the bond system and its nonlinear hysteretic behavior. In addition, it is observed that the degree of saturation changes the nonlinear hysteretic behavior. In the doctoral thesis, a model is proposedto capture the nonlinear hysteretic behavior. Upon implementation, a mesh-dependent behavior was observed as well as the non-closing of hysteretic loops. The mesh-dependent behavior is solved by introducing an internal scale of length and by formulating the model in a continuum-discreteapproach. Finally, a first approach to capture the nonlinear hystereticorthotropic behavior is proposed.