Lamb wave modes repulsion in multi-layered structures

在LaWaMoRe项目中，目标是开发一种无损检测方法，利用多层结构色散曲线中出现的模排斥区域来表征两层之间的耦合强度。据作者所知，目前的项目是第一次尝试理解和表征模斥相对于耦合强度。假设是，两层之间的耦合强度可以通过测量距离来表征，以频率或相速度（波数），两个耦合模式之间在一个模式排斥区域。在LaWaMoRe项目中，将探索和量化模斥与耦合强度之间的相关性。为了达到该项目的目的，将进行数值和实验研究。BAM在数值模拟方面有丰富的经验，特别是项目中使用的比例边界有限元法，并将为项目中将要开发的无损方法的验证提供必要的破坏性测试。EMT在测量方法的开发方面拥有多年的经验，特别是在材料特性的表征和逆向程序的使用方面，这是项目的其他关键方面。在LaWaMoRe项目中，两家机构的能力和经验的结合将不仅对科学界，而且对行业做出重要贡献，允许对粘合接头的质量进行无损表征。

In the LaWaMoRe project, the aim is to develop a non-destructive testing method for the characterisation of coupling strength between two layers using mode repulsion regions appearing in the dispersion curves of multi-layered structures. To the authors’ knowledge, the current project is the first attempt to understand and characterise the mode repulsion with respect to the coupling strength. The hypothesis is that coupling strength between two layers can be characterised through measuring the distance, in terms of frequency or phase velocity (wavenumber), between two coupled modes in a mode repulsion region. Within the LaWaMoRe project correlation between mode repulsion and the coupling strength will be explored and quantified. To reach the aim of the project, both numerical and experimental investigations will be carried out. BAM has a lot of experience in numerical modelling, especially the Scaled Boundary Finite Element Method to be used in the project and will provide necessary destructive testing for the validation of the non-destructive method to be developed in the project. EMT has years of experience in the development of the measurement methods, especially for the characterisation of material properties and employment of the inverse procedures which are other key aspects of the project. The combination of the competences and experiences of both institutions in the LaWaMoRe project will make an important contribution not only to the scientific community but also to the industry allowing for the non-destructive characterisation of the quality of adhesive joints.