均質材料の診断のためのアコースティックエミッション波伝搬の評価

抄録

Recently researches are being conducted to generate a proper acoustic emission (AE) wave numerically and to compare it theoretically. In this paper the generation of AE signal is theoretically analyzed for a homogeneous material applying surface load. Aluminum is selected as the homogenous material. Simulations for the validations of the developed computational algorithms are performed based on the established theories. Under similar conditions, AE wave generation and propagation experiments are also performed on the aluminum surface to validate the presented theory. The analysis for both the detected and the simulated waves are shown here. Among the AE wave parameters, the characteristics of maximum amplitude is selected for the comparison of the experimental and the simulated waves. The simulated wave is modified considering the influence of different transfer functions on the theoretical wave. The maximum amplitude of both the simulated and the experimental waves attenuates with the increase of source to receiver distance for different input loads.