Caracterización de materiales metálicos y friccionantes en estado tri-axial

Abstract

In the last century there have been several inquiries regarding the mechanical behavior of frictioning materials and metallic materials. The interest of this research lies in representing the real behavior of materials such as steel and concrete: first will be held in uni-axial state and later in tri-axial state. Given the complexity of the issue, in the literature of continuous media has developed different constitutive models to predict the behavior, such as models of plasticity, visco-plasticity models, damage models, etc. which must also satisfy the equations of thermodynamics. For the preparation of these constitutive equations representing the behavior of a material, it must establish a limit or fault condition, which is done through the yield surface. From the surface, the material behavior ceases to be elastic, and becomes inelastic, for it, internal variables are used, representing various parameters of the evolution of the behavior of the material, such as degradation of rigidity, plastic deformation, variation threshold failure, among others. Due to the complexity of the issue, first, constitutive models are built to characterize materials in uni-axial state; that is, plasticity, viscosity, visco-plasticity and damage. And then the models for tri-axial been formulated.