High-selectivity imaging of closed cracks using elastic waves with thermal stress induced by global preheating and local cooling
High-selectivity imaging of closed cracks using elastic waves with thermal stress induced by global preheating and local cooling
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DOI：
10.1063/1.4816160
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发表时间：
2013-07-15
影响因子：
4
通讯作者：
Yamanaka, Kazushi
中科院分区：
文献类型：
--
作者：
Ohara, Yoshikazu;Takahashi, Koji;Yamanaka, Kazushi
作者提出了一种基于裂纹热应力依赖性的实用方法，用于高选择性地精确成像闭合裂纹。通过整体预热和局部冷却（GPLC）引起的拉伸热应力打开裂纹，在线性相控阵（PA）图像中观察到一个紧密闭合的疲劳裂纹，尽管传统的仅使用局部冷却的方法不能完全打开裂纹。此外，通过GPLC前后PA图像的相减，仅以高选择性提取闭合裂纹，同时消除其他线性散射体。(C)2013 AIP Publishing LLC.
The authors developed a practical method based on the thermal stress dependence of cracks for the accurate imaging of closed cracks with high selectivity. A tightly closed fatigue crack was visualized in linear phased array (PA) images by opening the crack with the tensile thermal stress induced by global preheating and local cooling (GPLC), although the conventional method of using only local cooling could not fully open the crack. Furthermore, by the subtraction of the PA images before and after GPLC, only the closed crack was extracted with high selectivity while canceling the other linear scatterers. (C) 2013 AIP Publishing LLC.