Fracture process zone in notched concrete beam under three-point bending by acoustic emission
Fracture process zone in notched concrete beam under three-point bending by acoustic emission
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DOI：
10.1016/j.conbuildmat.2014.05.012
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发表时间：
2014-09-30
影响因子：
7.4
通讯作者：
Ohtsu, Masayasu
中科院分区：
文献类型：
--
作者：
Ohno, Kentaro;Uji, Kimitaka;Ohtsu, Masayasu
利用声发射技术研究了缺口混凝土梁在三点弯曲作用下的断裂过程区。对不同缺口深度和混凝土最大骨料尺寸的梁试件进行了试验，以阐明断裂过程区微裂缝的产生机理。采用SIGMA(简化格林函数矩张量分析)方法对声发射信号进行分析。实验结果表明，断裂能随骨料最大尺寸的增大而增大。结果表明，无论骨料的最大尺寸如何，微裂纹的主导运动都随缺口深度的不同而不同。根据声发射源定位结果估算了断裂过程区的宽度。证实了断裂能与声发射团簇的宽度相关，随着断裂过程区宽度的增大，断裂能也随之增大。(C)2014爱思唯尔有限公司。保留所有权利。
Investigation on fracture process zones in notched concrete beams under three-point bending is performed by applying acoustic emission (AE). The tests were conducted on beam specimens with different notch depths and the maximum sizes of aggregate in concrete to clarify the generation mechanisms of micro-cracks in the fracture process zone. SiGMA (simplified Green's functions for moment tensor analysis) procedure was applied to analyze AE signals. The experimental results show the fracture energy increases with increase in the maximum size of aggregate. It is found that dominant motions of microcracks vary with the notch depth, regardless of the maximum size of aggregate. The widths of the fracture process zone were estimated from results of AE source location. It is confirmed that the fracture energy correlates with the width of AE cluster, as the energy increase when the width of fracture process zone expands. (C) 2014 Elsevier Ltd. All rights reserved.