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Elastodynamic Behaviour of Laminate Structures with Soft Thin Interlayers: Theory and Experiment.
Maria V Wilde1, Mikhail V Golub2, Artem A Eremin2
1Faculty of Mathematics and Mechanics, Saratov State University, 410012 Saratov, Russia.
Materials (Basel, Switzerland)
|February 25, 2022
Summary
This study introduces a new ultrasonic method for assessing laminate structures, focusing on identifying interlayer properties. The technique effectively analyzes guided waves to determine film thickness, stiffness, and contact quality.
Area of Science:
- Materials Science
- Mechanical Engineering
- Non-Destructive Testing
Background:
- Laminate structures with soft interlayers are crucial in aerospace, automotive, and civil engineering.
- Reliable non-destructive testing (NDT) and structural health monitoring (SHM) are needed for condition assessment.
- Understanding elastodynamic behavior is key for NDT/SHM of these materials.
Purpose of the Study:
- Investigate the elastodynamic behavior of laminate structures for NDT and SHM.
- Identify interlayer mechanical and interfacial contact properties using ultrasonic methods.
- Develop a step-wise procedure to evaluate film and interface parameters separately.
Main Methods:
- Numerical investigation using a three-layer model with spring-type boundary conditions.
- Derivation of novel effective boundary conditions via asymptotic expansion technique.
- Experimental validation using laser Doppler vibrometry for Lamb waves in an Aluminium/Polymer film/Aluminium structure.
Main Results:
- Thin, soft films significantly influence laminate behavior through effective stiffnesses (film moduli, thickness, interface stiffness).
- A step-wise procedure using effective boundary conditions accurately estimates these parameters.
- Film resonance frequencies can be used to assess film properties and contact quality.
Conclusions:
- The proposed ultrasonic method accurately characterizes laminate structures.
- Effective boundary conditions provide a powerful tool for analyzing guided waves in laminates.
- This research contributes to improved condition assessment and maintenance strategies for critical infrastructure.
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