Crack localization in a double-punched concrete cuboid with time reverse modeling of acoustic emissions
Crack localization in a double-punched concrete cuboid with time reverse modeling of acoustic emissions
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DOI：
10.1007/s10704-011-9621-y
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发表时间：
2011-09-01
影响因子：
2.5
通讯作者：
Saenger, Erik H.
中科院分区：
文献类型：
--
作者：
Kocur, Georg Karl;Vogel, Thomas;Saenger, Erik H.
时间反向建模（TRM）成功地应用于对118 x 120 x 160 mm混凝土长方体的物理实验（双冲孔测试）中获得的声发射（AE）进行局部定位。以前，使用数值（里克小波）和实验（铅笔芯断裂）激励进行可行性研究，以证明TRM对实际声发射波形的适用性。采用非均质无裂纹混凝土模型进行数值模拟。对数值和实验可行性研究的定位结果进行了比较和验证。利用TRM技术对双冲压试验过程中所记录的声发射进行了三维定位。局部化结果与从破坏混凝土长方体的x射线计算机断层扫描中获得的三维阈值分段裂缝模式叠加。提出的TRM方法为基于信号的声发射分析提供了可靠的定位工具。
Time reverse modeling (TRM) is successfully applied to localize acoustic emissions (AE) obtained from a physical experiment (double punch test) on a 118 x 120 x 160 mm concrete cuboid. Previously, feasibility studies using numerical (Ricker wavelet) and experimental (pencil-lead break) excitations are performed to demonstrate the applicability of TRM to real AE waveforms. Numerical simulations are performed assuming an uncracked and heterogeneous concrete model. The localization results from the numerical and experimental feasibility studies are compared and verified. The AE recorded during the double punch test are localized in a three-dimensional domain using TRM. The localization results are superposed with the three-dimensional threshold-segmented crack patterns obtained from X-ray computed tomography scans of the failed concrete cuboid. The presented TRM approach represents a reliable localization tool for signal-based AE analysis.