School of Traffic and Transportation Engineering, Central South University, Changsha, Hunan 410075, China.
School of Traffic and Transportation Engineering, Central South University, Changsha, Hunan 410075, China.
Ultrasonics. 2023 Jul;132:107002. doi: 10.1016/j.ultras.2023.107002. Epub 2023 Apr 5.
The modeling and visualization of wave fields scattered by flaws can be helpful in terms of guiding the testing and evaluation of flaws using an ultrasonic nondestructive method. In this work, the ultrasonic scattering of wave fields from flaws with different shapes is modeled using a quasi-Monte Carlo (QMC) method and measured through experiments for verification. The incident wave fields generated by a transducer can be modeled using the Rayleigh integral expression and calculated using the QMC method. When the size of the flaw is much larger than the wavelength, the incident wave over the lit portion of flaw can be treated as the source for the scattering of wave fields, and these wave fields can also be modeled using the proposed QMC method. In this paper, water is treated as the material and an embedded solid component is considered as the flaw. Numerical examples and results are presented for flaws with different shapes and sizes, and the properties of these scattering wave fields are analyzed and discussed. Experiments are performed to measure the scattering wave fields using a needle transducer, and it is shown that the results agree with the simulations, thus verifying the proposed modeling method. The work presented here can assist in understanding the wave-flaw interaction and can help in optimizing ultrasonic nondestructive testing.
波场散射的建模和可视化对于使用超声波无损检测方法指导缺陷的检测和评估是有帮助的。在这项工作中，使用拟蒙特卡罗（QMC）方法对具有不同形状的缺陷的波场散射进行建模，并通过实验进行测量以验证。换能器产生的入射波场可以使用瑞利积分表达式进行建模，并使用 QMC 方法进行计算。当缺陷的尺寸远大于波长时，可以将缺陷受光部分上方的入射波视为波场散射的源，这些波场也可以使用所提出的 QMC 方法进行建模。本文将水视为材料，并将嵌入式固体组件视为缺陷。针对不同形状和尺寸的缺陷给出了数值示例和结果，并对这些散射波场的特性进行了分析和讨论。实验使用针状换能器测量散射波场，结果表明，模拟结果与实验结果一致，验证了所提出的建模方法。这里提出的工作可以帮助理解波与缺陷的相互作用，并有助于优化超声波无损检测。
