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Updated: Jan 18, 2026

Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System
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Dynamic interface behavior in coupled plates: Investigating Lamb wave mode repulsion with a spring-based model.

Marcel Nicolai1, Jannis Bulling1, M M Narayanan1

  • 1Federal Institute for Material Research and Testing, Berlin, Germany.

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|September 7, 2025
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Summary
This summary is machine-generated.

Mode repulsion in Lamb waves is explained by interface stiffness and plate oscillations. This study offers insights for advanced material characterization and non-destructive evaluation.

Keywords:
Coupled platesDispersion curvesElastic interfaceLamb wavesMode repulsion

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Area of Science:

  • Solid Mechanics
  • Wave Propagation
  • Materials Science

Background:

  • Lamb waves are crucial for non-destructive evaluation.
  • Understanding wave behavior in coupled structures is complex.
  • Mode repulsion phenomena require detailed investigation.

Purpose of the Study:

  • To investigate mode repulsion in Lamb waves in coupled plates.
  • To analyze the influence of interface stiffness on mode separation.
  • To explain the underlying dynamics of mode repulsion.

Main Methods:

  • Utilized a spring-based coupling model.
  • Employed the Scaled Boundary Finite Element Method (SBFEM).
  • Analyzed dispersion curves under varying interface conditions (weak, sliding, perfect coupling).

Main Results:

  • Interface stiffness directly influences mode separation and repulsion.
  • Discovered unique dynamic behaviors in repulsion regions due to plate oscillations.
  • Linked mode repulsion to specific strain patterns within the elastic interface.

Conclusions:

  • Provided a physically grounded explanation for mode repulsion in coupled Lamb wave systems.
  • Established a theoretical foundation for using mode repulsion in material characterization.
  • Highlighted potential for enhanced non-destructive evaluation techniques.