Caracterización dinámica simétrica y asimétrica a fractura en modo III de composites epoxi-fibra de carbono unidireccional

The present work shows the results obtained after rehearsing fatigue in mode III a material composed of epoxy resin with unidirectional carbon fiber reinforcement. For the execution of the tests and has used a test device that has been previously designed and whose validity has been proven. The novelty of this work is that it is the first time that a study of fatigue to fracture is carried out according to mode III in this type of materials. In addition, this fatigue has been made in two different ways. First, it has been loaded in one direction until reaching a certain angle and returning almost to the starting point and, secondly, it has been loaded both in one direction and in the opposite. Hence the first case is called asymmetric fatigue and in the second, symmetrical fatigue. The results obtained are different since the case of loading is, in both cases, substantially different. In both cases, a statistical analysis of the results has been carried out in order to be able to compare the existing differences more properly.