Direct Calculation of the Group Velocity for Two-Dimensional Complex, Composite and Periodic Structures Using a Wave and Finite Element Scheme

Applied Sciences

卷:11

Francesco Ciampa¹  Muhammad Khalid Malik²  Dimitrios Chronopoulos² 

[1] Department of Mechanical Engineering Sciences, University of Surrey, Guildford GU2 7XH, UK;

[2] The Composites Group, University of Nottingham, Nottingham NG7 2RD, UK;

关键词: guided waves;    structural health monitoring;    group velocity;    layered structures;    dispersion curves;   

DOI  :  10.3390/app11104319

来源: DOAJ

【 摘 要 】

Guided waves have immense potential for structural health monitoring applications in numerous industries including aerospace. It is necessary to evaluate guided wave dispersion characteristics, i.e., group velocity and phase velocity profiles, for using them effectively. For complex structures, the profiles can have highly irregular shapes. In this work, a direct method for calculating the group velocity profiles for complex, composite, and periodic structures using a wave and finite element scheme is presented. The group velocity calculation technique is easy to implement, highly computationally efficient, and works with the standard finite element formulation. The major contribution is summarised in the form of a comprehensive algorithm for calculating the group velocity profiles. The method is compared with the existing analytical and numerical methods for calculation of dispersion curves. Finally, an experimental study in a multilayered composite plate is conducted and the results are found to be in good agreement. The technique is suitable to be used in all guided wave application areas such as material characterisation, non-destructive testing, and structural health monitoring.

【 授权许可】

Unknown