ABSTRACT Defects induced in materials are accompanied by a local decrease of stiffness in the damaged area, which manifests in their characteristic frequencies and a possibility of resonant activation by a driving acoustic wave. Such Local Defect Resonance (LDR) enables to reliably detect and visualize the defect as soon as the driving acoustic frequency is matched to damage characteristic frequency. This also provides a high frequency selectivity of the LDR-based imaging, i.e., an opportunity of detecting a certain defect among a multitude of other defects in material. In this article, the benefits of the resonant approach are demonstrated via multiple case studies for nonlinear, optical, and thermosonic frequency-selective imaging of defects in lightweight materials and components.

中文翻译：

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损伤的共振超声激活：诊断成像的应用

摘要材料中引起的缺陷伴随着损坏区域刚度的局部降低，这体现在它们的特征频率和驱动声波共振激活的可能性上。一旦驱动声频与损坏特征频率匹配，这种局部缺陷共振 (LDR) 就能够可靠地检测和可视化缺陷。这也提供了基于 LDR 的成像的高频选择性，即检测材料中众多其他缺陷中的某个缺陷的机会。在本文中，谐振方法的优势通过对轻质材料和组件中的缺陷进行非线性、光学和热超声频率选择性成像的多个案例研究来证明。