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The structural behavior of beams under distributed loads is critical for engineering analysis, which focuses on predicting how beams bend and react under such conditions. Different types of beams (e.g., cantilever, supported, or overhanging) behave differently under distributed load conditions.
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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.

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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.

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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.