Aplicação da mecânica da danificação em materiais compósitos poliméricos reforçados por fibras de vidro

Abstract

Among the materials used commonly in the world, there is a detached one that is special for polymeric composite materials, from the manufacture of toys to devices. In this way, it is necessary an ample inquiry on all the referring aspects to these materials. Thus, this research intend to evaluate the damage processes of a polymeric composite (PMMA, reinforced by glass fibers) through a mathematical model for the normal stress. Firstly, many tension tests were made and then, they were numerically simulated, where mathematical characteristic parameters of this material had been found. Relative aspects of the chemical and the metallographic characterization are also presented in this research. After that, numerical analysis were made by the Finite Element Method in a an internationally known software with the objective to verify the existing relation between the length of cracks and the value of the damage variable. With these data, the values for the Dc variable and the intervals of validity of the presented expression had been determined. Finally, it is concluded the importance of studies as this to obtain descriptions of degradation of the material for a for posterior analysis of remaining life of it. In this research, the relation damage x length of the crack was determined, something original in our national literature, beyond the presentation of suggestions for new works, related with the damage mechanics in diverse materials.