非线性兰姆波的溶液在不连续厚度的板块中
Weiyi Zuo1,2,3, Zhiwu An1,2, Bixing Zhang1,2
1State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, China.
The Journal of the Acoustical Society of America
|March 20, 2024
概括
非线性Lamb波揭示了结构中的材料疲劳损伤. 研究它们在厚度不连续性的散射增强了非破坏性测试和材料健康监测能力.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 声学 声学 在声学方面
背景情况:
- 非线性Lamb波传播长距离,并检测早期的材料疲劳.
- 板块/外结构的不连续性导致非线性兰姆波波散射.
- 了解散射对于材料健康监测和缺陷检测至关重要.
研究的目的:
- 研究非线性Lamb波在不连续板中的第二波的传播和散射.
- 分析 evanescent 模式和不线性边界效应在不连续性的影响.
- 检查基于频率和板状几何学的散射特征.
主要方法:
- 开发了一种非线性兰姆波波散射分析的积分公式.
- 调整了公式,以提高多个Lamb波模式的计算稳定性.
- 使用过渡的有限元模拟验证了拟议的方法.
主要成果:
- 量化了 evanescent 模式和非线性边界效应对二次波散射的贡献.
- 分析了频率和几何不连续性如何影响散射模式.
- 证明了用于分析复杂的Lamb波相互作用的改进的计算稳定性.
结论:
- 在不连续性的非线性Lamb波散射提供了对结构和缺陷特征的洞察.
- 开发的方法提高了分析非线性Lamb波现象的准确性和稳定性.
- 这项研究有助于推进非破坏性测试和材料健康监测应用.
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