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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >A time-domain finite element boundary integration method for ultrasonic nondestructive evaluation
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A time-domain finite element boundary integration method for ultrasonic nondestructive evaluation

机译：超声无损评估的时域有限元边界积分方法

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摘要

A 2-D and 3-D numerical modeling approach for calculating the elastic wave scattering signals from complex stress-free defects is evaluated. In this method, efficient boundary integration across the complex boundary of the defect is coupled with a time-domain finite element (FE) solver. The model is designed to simulate time-domain ultrasonic nondestructive evaluation in bulk media. This approach makes use of the hybrid concept of linking a local numerical model to compute the near-field scattering behavior and theoretical mathematical formulas for postprocessing to calculate the received signals. It minimizes the number of monitoring signals from the FE calculation so that the computation effort in postprocessing decreases significantly. In addition, by neglecting the conventional regular monitoring box, the region for FE calculation can be made smaller. In this paper, the boundary integral method is implemented in a commercial FE code, and it is validated by comparing the scattering signals with results from corresponding full FE models. The coupled method is then implemented in real inspection scenarios in both 2-D and 3-D, and the accuracy and the efficiency are demonstrated. The limitations of the proposed model and future works are also discussed.
机译：评估了一种用于计算来自复杂无应力缺陷的弹性波散射信号的2-D和3-D数值建模方法。在这种方法中，跨缺陷的复杂边界的有效边界积分与时域有限元（FE）求解器耦合。该模型旨在模拟大体积介质中的时域超声无损评估。这种方法利用了链接本地数值模型以计算近场散射行为的混合概念，以及用于后处理以计算接收信号的理论数学公式。它使来自FE计算的监视信号的数量减至最少，从而大大减少了后处理中的计算量。另外，通过忽略常规的常规监视盒，可以减小用于FE计算的区域。在本文中，边界积分法是在商业有限元代码中实现的，并且通过将散射信号与相应完整有限元模型的结果进行比较来进行验证。然后在二维和3-D的实际检查场景中实施耦合方法，并证明了准确性和效率。还讨论了提出的模型的局限性和未来的工作。

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