A finite element model investigation of ultrasonic array performance for inspecting polycrystalline materials
A finite element model investigation of ultrasonic array performance for inspecting polycrystalline materials
复制标题
用于检测多晶材料的超声波阵列性能的有限元模型研究
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
M. Lowe
中科院分区：
文献类型：
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作者：
A. V. Pamel;P. Huthwaite;C. Brett;M. Lowe
微结构噪声长期以来一直阻碍着多晶材料的超声无损检测。然而，近年来，阵列为推进这些材料的超声波检测提供了新的可能性。利用有限元(FE)模型研究了颗粒散射对阵列缺陷检测的阻碍作用。这些问题包括由于各向异性引起的多次散射和光束偏差；物理的两个方面，由于理论假设或计算限制，在分析模型中经常需要忽略。我们依靠基于GPU的有限元解算器POGO来提供快速计算，从而实现参数研究。研究了中心频率和孔径大小变化对阵列检测性能的影响。初步结果表明，对于这些材料的检测，无论是阵列孔径还是频率都存在一个最佳值。
Microstructural noise has long hindered ultrasonic NDE of polycrystalline materials. In recent years however, arrays have enabled new possibilities to advance ultrasonic inspection of these materials. A Finite Element (FE) model is used to explore the different phenomena caused by grain scattering which may hinder detection of defects by an array. These include multiple scattering and beam deviation due to anisotropy; two aspects of the physics which are often required to be ignored in analytical models due to theoretical assumptions or computational limitations. We rely on a GPU based FE solver, Pogo, to provide fast computation and thereby enable parametric studies. The impact on array detection performance when varying center-frequency and aperture size is investigated. Preliminary results show that there exists an optimum for both the array aperture and frequency for inspection of these materials.