Damage Evaluation in Consideration of Distance Decay and Frequency Characteristics of Elastic Wave
Such parameters in the conventional elastic wave method, as frequency and velocity, connected to the damage so far, did not take the influence of the attenuation of propagation distance into consideration so that they were not able to directly connect to the index of degradation. This research studies the quantitative damage evaluation of heterogeneous materials by using frequency response characteristics of elastic waves according to the propagation distance for the purpose of establishment of the elastic wave degradation index which is not influenced by the propagation distance and frequency. Several mortar specimens, which were given by two types of styrene material simulating false cavity, were prepared for examination, and elastic waves were excited and propagated through the specimen. As a result, it was clarified that the quantitative damage evaluation of heterogeneous materials could be performed by comparing two detected waveforms in combination with the ratio of a frequency response.
KeywordsPorosity Attenuation Styrene Convolution Acoustics
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