繰返し一軸圧縮荷重を受けるモルタルの AE 特性に関する基礎的研究 (2)(農業工学)

概要

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In this paper, some characteristics of acoustic emission waves detected from cement mortar have been studied experimentally using the cylindrical specimens with 10cm in diameter and 20cm in highit under repeated uniaxial compression. The A. E. measurements were conducted with along the tests of repeated uniaxial compression at a constant deformation rate and the distributions of amplitude and frequency of A. E. waves were determined by the recording signals on a X-Y recorder. The results obtained are as follows. (1) The excellent frexuency range of the A. E. waves detected from these specimens was from 110kHz to 150kHz. (2) The relationships of these frequency-amplitude in detected A. E. waves under repeated uniaxial compression were not represented by a straight line in logarithmic scale. This is a different result from the conclusion obtained by the experiments on most metals. (3) The correlation between the amplitude distribution and crack groth behaviour is clear and the energy change of the detected A. E. waves presents the useful information to find the stage of the failure process of the specimen. (4) The relationships between the diffraction of elastic waves by crack and the A. E. rate were investigated and some problems of ultrasonic wave propagation test or resonant coloumn test for the crack groth specimen were pointed out.
神戸大学の論文
1981-01-30