Coordination Funds

利用超声导波对薄壁轻型结构进行结构健康监测是国际上研究的热点。在用兰姆波检测各向同性、均质材料（如铝）中的损伤后，首次研究并发表在许多出版物上，国际研究人员小组研究了各向异性但仍均匀的材料（如纤维复合材料）中的波传播和波与损伤的相互作用。在这一领域也有广泛的已发表的知识基础。然而，波在各向异性材料层合板中的传播和薄壁构件厚度方向上的强烈不均匀性是完全未探索和未解释的。纤维金属层压板是这类材料的典型代表。研究单元FOR3022的目标是在未来6年内深入了解使用超声导波（GUW）的纤维金属层压板（FML）的综合结构健康监测（SHM）。这需要对波传播的物理现象进行整体观察，即使在复杂的环境条件下，它们与隐藏的损伤的相互作用，使用事件位置处的微型技术传感器记录这些相互作用，以及用于完整损伤诊断的信号处理。研究结果将有助于考虑和全面了解波在所有分层材料系统中的传播，这些系统由大阻抗差异的组件组成。

Structural Health Monitoring (SHM) in thin-walled lightweight structures using guided ultrasonic waves (GUW) is the subject of intensive international research. After the detection of damage with lamb waves in isotropic, homogeneous materials such as aluminium was first investigated and published in numerous publications, international groups of researchers addressed wave propagation and wave interaction with damage in anisotropic but still homogeneous materials trough thickness such as fibre composites. A broad published knowledge base also exists in this field. However, the wave propagation in laminates of anisotropic materials and strong inhomogeneity in the thickness direction of thin-walled components is completely unexplored and unexplained. Fibre-metal laminates are a typical representative of this class of materials.The aim of the Research Unit FOR3022 is to gain a profound understanding of an integrated Structural Health Monitoring (SHM) in Fibre Metal Laminates (FML) using guided ultrasonic waves (GUW) over the next 6 years. This requires an integral view on the physical phenomena of wave propagation even under complex environmental conditions, their interaction with hidden damage, recording of these interactions using micro-technical sensors at the location of event, and a signal processing for full damage diagnostics. The findings will be useful for the consideration and comprehensive understanding of wave propagation in all layered material systems made from components of large impedance differences.