Damage based constitutive model for predicting the performance degradation of concrete

Formulación, implementación y validación de un modelo de daño escalar para materiales frágiles aplicado a elementos sólidos tridimensionales

“…Scalar damage models are the simplest, because they consider the degradation of the stiffness through a single scalar variable that equally affects all the components of the elastic stiffness tensor, while maintaining the isotropy conditions (Kachanov, 1958;Lubliner et al, 1989;Faria et al, 1998;Grassl et al, 2013;Juarez-Luna et al, 2014). When the material's directional properties are considered, the damage variable should be defined in the tensorial field, giving rise to the anisotropic models (Lee et al, 1997;Carol et al, 2001;Pelá et al, 2013;Wang et al, 2014). At the same time, in the case of reversible loadings, the direction of the force in the frictional materials can activate the crack by reducing the net section (tensile stress case) or remaining inactive (compressive stress case).…”

Constitutive behaviour of quasi-brittle materials with anisotropic friction

“…Some of the research efforts made in recent years to achieve a better understanding of constitutive behaviour of quasi-brittle materials have been developed in the framework of plasticity (Pietruszczak and Niu, 1992). Constitutive models developed in this last field for concrete (Feenstra and De Borst, 1996;Wang et al, 2014) have been successfully applied to masonry structures. Unfortunately the postu-Latin A m erican Journal of Solids and Structures 12 (2015) [695][696][697][698][699][700][701][702][703][704][705][706][707][708][709][710] lates by Drucker (1951;1988); Hill (1958) providing the framework for establishing the material stability have in recent times come under very strong challenge in relation to their validity for geomaterials.…”