Elastic Wave Mechanics in Damaged Metallic Plates

IF 2.2 3区 综合性期刊 Q2 MULTIDISCIPLINARY SCIENCES Symmetry-Basel Pub Date : 2023-10-27 DOI:10.3390/sym15111989
Samuel Chukwuemeka Olisa, Muhammad A. Khan, Andrew Starr
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Abstract

Human health monitoring (HHM) is essential for continued daily task execution, as is structural health monitoring (SHM) for structures to ensure the continual performance of their designed tasks with optimal efficiency. The existence of damage in a structure affects its optimal use through stiffness deterioration. Damage of different forms could occur in a structure but have the singular objective of material degradation, leading to its underuse for a task. Guided wave ultrasonics has shown strength in detecting sundry damage in structures, but most of the damage monitored and detected is unfilled with substances. However, some damage could trap and accumulate substances that could hasten material degradation through corrosion activities under favorable conditions, especially in the oil and gas industry. This study used the ultrasonic-guided waves’ pitch–catch inspection technique to identify damage filled with different materials. The assessment was based on the RMSD of the dominant Lamb wave mode’s average maximum amplitude and the response signals’ transmission coefficient (TC). A five-cycle tone burst of excitation signals of different frequencies was created to generate propagating Lamb waves in the structure. The fundamental antisymmetric mode was found to be more sensitive than the fundamental symmetric mode when detecting damage filled with various substances. At 80 kHz, the deviation of the current response signals from the baseline response signals due to different filled substances in the damage was distinct and decreased with increased fluid viscosity. Given that structures in the oil and gas sector are particularly susceptible to substance-induced damage, the outcomes of this study are paramount.
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损伤金属板的弹性波动力学
人体健康监测(HHM)对于持续的日常任务执行至关重要,结构健康监测(SHM)对于确保结构以最佳效率持续执行其设计任务至关重要。结构损伤的存在通过刚度劣化影响结构的最佳使用。不同形式的损伤可能发生在一个结构中,但有一个单一的目标是材料降解,导致其在任务中使用不足。导波超声在检测各种结构损伤方面显示出强大的能力,但大多数被监测和检测的损伤是未填充物质的。然而,在有利的条件下,特别是在石油和天然气行业,一些损坏可能会捕获和积累物质,从而加速材料的降解。采用超声导波的俯角检测技术对不同材料填充的损伤进行识别。基于主导兰姆波模式的平均最大振幅的RMSD和响应信号的透射系数(TC)进行评估。利用不同频率的激励信号形成五周期的音调突发,在结构中产生传播的兰姆波。在检测充满各种物质的损伤时,基本反对称模态比基本对称模态更灵敏。在80 kHz时,损伤中不同填充物质导致的电流响应信号与基线响应信号的偏差明显,且随流体粘度的增加而减小。考虑到油气行业的结构特别容易受到物质引起的破坏,这项研究的结果是至关重要的。
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来源期刊
Symmetry-Basel
Symmetry-Basel MULTIDISCIPLINARY SCIENCES-
CiteScore
5.40
自引率
11.10%
发文量
2276
审稿时长
14.88 days
期刊介绍: Symmetry (ISSN 2073-8994), an international and interdisciplinary scientific journal, publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided, so that results can be reproduced.
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