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Thick sandwich beam structures are commonly used in various engineering applications due to their lightweight and high-stiffness properties. However, their distinct material compositions often result in pronounced transverse shear deformations and in the case of thicker beams, additional transverse normal deformations. The recently developed mixed-higher-order en-RZT for plates is here applied to numerically evaluate the dynamic properties of symmetric thick sandwich beams. In this experimental-numerical study, a series of sandwich beam specimens of different thicknesses, made of ERGAL face-sheets and Rohacell® WF110 core, are dynamically investigated using a Laser Doppler Vibrometry (LDV). The experimental modal parameters (natural frequencies and modal shapes) obtained from LDV measurements are compared with the theoretical predictions for the flexural modes based on a finite element beam model developed on the mixed-Refined Zigzag Theory ( \({\text{B - RZT}}_{{\{ 3,2\} }}^{(m)}\) ).

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Dynamic Assessment of Thick Sandwich Beams Using a Mixed-Refined Zigzag Theory: Experimental Validation Using Laser Doppler Vibrometry

  • 会议论文

  • 发表日期：

    2025年

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  • Matteo Sorrenti,
  • Marco Gherlone,
  • Simão Pedro Lima Carvalho

摘要

Thick sandwich beam structures are commonly used in various engineering applications due to their lightweight and high-stiffness properties. However, their distinct material compositions often result in pronounced transverse shear deformations and in the case of thicker beams, additional transverse normal deformations. The recently developed mixed-higher-order en-RZT for plates is here applied to numerically evaluate the dynamic properties of symmetric thick sandwich beams. In this experimental-numerical study, a series of sandwich beam specimens of different thicknesses, made of ERGAL face-sheets and Rohacell® WF110 core, are dynamically investigated using a Laser Doppler Vibrometry (LDV). The experimental modal parameters (natural frequencies and modal shapes) obtained from LDV measurements are compared with the theoretical predictions for the flexural modes based on a finite element beam model developed on the mixed-Refined Zigzag Theory ( \({\text{B - RZT}}_{{\{ 3,2\} }}^{(m)}\) ).