アコースティック・エミッションの波形を利用したコンクリートの軟化領域の推定法

概要

論文の詳細を見る
An acoustic emission (AE) testing is useful for detecting the damage within cementitious materials in real time. Based on the time differences between detections of an AE event at different transducers, its source can be located. Sources of AE activity were studied for plain-mortar, concrete and model-concrete specimens loaded in three-point bend. To locate AE sources precisely, the arrival time was determined from the first motion of the waveform and the spectral analysis was carried out based on the maximum entropy method. The results show that AE events from the tip in the softening zone have higher frequency components (250-450kHz) besides the frequency components in the range of 100-200kHz which all AE events have. By picking the AE events with higher frequency components, it is possible to evaluate the extent of the damage in concrete-like materials more clearly.
社団法人日本建築学会の論文
1994-12-30