モルタルのAEと応力拡大係数との関係に関する研究(I)

概要

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Some relationships between acoustic emission (AE) and stress intensity factor (K) in a notched mortar specimen are investigated in this paper. To reach the purpose of the present investigation the three point bending tests were carried out using the square pillar specimen with a notch at the mid point. The vertical displacement where the load was applied at the mid point of the specimen was measured and then AE was detected from the adjacent point of the notch. The J integral was estimated to find out the values of K by applying the finite element method analysis and compare results with those estimated by Rice's simplified formula using the experimental P-Δ (load-vertical displacement) curve. As the comparison of the results approximately agree with limited available data, it is expected that estimates obtained from such a procedure should be useful in estimating the K values of concrete and mortar behaving in small strain. There is the good correlation between K values and AE counts in many specimens, and they may be estimated at the slow and rapid crack propagation points decided from the AE cumulative curve of mortar specimens. The K values estimated at the point of rapid crack propagation indicated lower scattering than the K values at other point, and this procedure will allow an estimate of magnitude of the K values of mortar and concrete.
神戸大学の論文