Análise numérica da caracterização do processo de dano em materiais compósitos

Abstract

Materials in engineering are in constant technology advancing, looking for mechanical properties that satisfy different loading conditions and environments. To meet a portion of the demand of the current market needs, a new range of materials called composites was developed. These are heterogeneous formed by different materials, or two or more phases of the same material, which seek to combine the properties to obtain the best physical and mechanical characteristics of both in the same material. Thus, due to its wide application, knowing how the damage propagates in these materials is still an open topic in the scientific community. Some alternatives to quantify the damage and help in the design of these materials are the numerical methods and non-destructive testing. Thus, the present work aims to simulate the behavior of composite materials reinforced with glass fibers distributed in a unidirectional and random way using the classical Peridynamic (PD) theory. The global behavior of the material as well as the rupture configuration obtained are compared with available experimental results. In the composite reinforced with randomly distributed glass fibers, it is also sought to simulate the Acoustic Emission (AE) test, and to compare the activity recorded with experimental AE data. The results show that PD presents itself as a good tool for the study of composite materials, capturing the mechanical characteristics and the collapse shape. The analysis of the AE data of the simulated sample follows the patterns observed in the experimental test, managing to identify the imminence of failure. Keywords: Composite materials, Peridynamics, Acoustic emission.