Analytical evaluation of resonance frequencies for planar defects: Effect of a defect shape
Analytical evaluation of resonance frequencies for planar defects: Effect of a defect shape
复制标题
DOI：
10.1016/j.ndteint.2018.12.008
复制
发表时间：
2019-03-01
影响因子：
4.2
通讯作者：
Kreutzbruck, Marc
中科院分区：
文献类型：
--
作者：
Solodov, Igor;Rahammer, Markus;Kreutzbruck, Marc
局部缺陷共振（LDR）是一种很有前途的基于其共振超声响应来检测、定位和可视化损伤的方法。本文应用经典的瑞利方法对聚合物和复合材料中各种形状平面缺陷的LDR基频进行了分析计算。用模拟和真实分层进行的一系列实验验证了所得到的解析公式，并揭示了理论方法在实际应用中的限制。考虑的案例研究包括缺陷的一些基本形状，以识别缺陷形状、尺寸和位置对LDR频率的影响。结合共振成像结果导出的表达式解决了表征缺陷位置深度的逆向问题。
Local Defect Resonance (LDR) is a promising approach to detect, localize, and visualise damage based on its resonant ultrasonic response. In this paper, the classical Rayleigh's method is applied for analytical evaluation of the fundamental frequencies of LDR for various shape planar defects in polymers and composite materials. A series of experiments implemented with simulated and realistic delaminations verifies the analytical formulas obtained and reveals the constraints for practical application of the theoretical approach. The case studies considered include some basic shapes of the defects to recognize the impact of the defect shape, size and position on LDR frequency. The expressions derived combined with the resonant imaging results address the reverse problem of characterizing the depth of the defect location.