EVALUATION OF FATIGUE DAMAGE FOR FRM WITH AE METHOD

摘要

Composite materials have the merit that its structure can be designed in accordance with the functional requirement and are widely used as structural members. However, fatigue phenomenon cannot be avoided and mechanisms on the growth of fatigue damage are complicated. The fatigue damage becomes a serious problem in evaluating the reliability of structures. In this report, the parameters for evaluating the fatigue damage of fiber-reinforced metals (FRM) with AE method are proposed. Detected AE signals during fatigue testing were analyzed with weighted-mean-frequency distribution and wavelet transform methods. As the results, the possibility of evaluating the damage by the features of the frequency distribution graphs and the fractal dimension that represented the complexity of the time fluctuation of wavelet coefficient is shown.