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Lamb Wave Scattering Analysis for Interface Damage Detection between a Surface-Mounted Block and Elastic Plate.
Mikhail V Golub1, Alisa N Shpak1, Inka Mueller2
1Institute for Mathematics, Mechanics and Informatics, Kuban State University, 350040 Krasnodar, Russia.
Sensors (Basel, Switzerland)
|February 2, 2021
Summary
Detecting damage in engineering structures is crucial. This study uses Lamb waves and simulations to identify defects in stiffener-plate joints, improving structural health monitoring.
Area of Science:
- Engineering
- Materials Science
- Physics
Background:
- Stringers enhance thin-walled structure strength in engineering constructions.
- Effective damage detection methods are needed for stringer-to-structure joints.
- Interface defects can compromise structural integrity.
Purpose of the Study:
- To develop and validate methods for detecting interface defects between stringers and thin-walled structures.
- To numerically analyze Lamb wave scattering by stiffeners with various bonding states.
- To assess the feasibility of guided wave-based structural health monitoring for joint integrity.
Main Methods:
- A 2D mathematical model simulating Lamb wave propagation and scattering.
- Finite element method (FEM) and a semi-analytical hybrid approach for numerical analysis.
- Experimental validation using laser Doppler vibrometry for bonded and semi-debonded obstacles.
Main Results:
- Numerical analysis of fundamental Lamb wave scattering via rectangular stiffeners.
- Identification of two defect types: partial adhesive degradation and open cracks.
- Analysis of damage indices derived from sensor data to quantify defects.
Conclusions:
- Lamb wave-based methods show promise for detecting interface defects in stiffener-plate joints.
- Numerical simulations coupled with experimental validation provide reliable damage assessment.
- Optimization of input impulse functions is key for advancing guided-wave structural health monitoring.
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