School of Architecture and Civil Engineering, The University of Adelaide, Adelaide, SA 5005, Australia.
School of Architecture and Civil Engineering, The University of Adelaide, Adelaide, SA 5005, Australia.
Ultrasonics. 2023 Jul;132:106995. doi: 10.1016/j.ultras.2023.106995. Epub 2023 Mar 27.
Non-destructive detection and evaluation of fatigue cracks is critical to maintain safety and effective operation of high-value assets working under cyclic loading. However, this can be difficult in the case of the corners of the structural elements, especially at inaccessible locations. In this article, the propagation of the fundamental symmetric mode of edge wave (ES) along structural features such as sharp and rounded corners are investigated using experimental and numerical methods. The ultimate aim of this study is to demonstrate that the ES is a promising for defect detection in geometries with corners. The outcomes of this study show that ES wave is able to propagate through sharp and rounded corners and provides a way to inspect difficult-to-reach locations. Further, the numerical simulations indicate that the radius-to-wavelength ratio above 3 has no significant impact on the wave amplitude when the ES propagates through the rounded corner. The results also demonstrate that the presence of fatigue crack leads to generation of the second harmonic of the ES wave mode, and this phenomenon can be utilised in the development of fatigue crack detection and characterization procedures.
非破坏性检测和评估疲劳裂纹对于在循环载荷下工作的高价值资产的安全和有效运行至关重要。然而，在结构元件的拐角处，特别是在难以到达的位置，这可能会很困难。本文通过实验和数值方法研究了基本对称模态的边缘波（ES）在诸如尖角和圆角等结构特征中的传播。本研究的最终目的是证明 ES 波在具有拐角的几何形状中是一种很有前途的缺陷检测方法。本研究的结果表明，ES 波能够穿过尖角和圆角传播，并为难以到达的位置提供了一种检查方法。此外，数值模拟表明，当 ES 通过圆角传播时，半径与波长之比大于 3 对波幅没有显著影响。结果还表明，疲劳裂纹的存在会导致 ES 波模式的二次谐波的产生，并且这种现象可用于开发疲劳裂纹检测和特征描述程序。
