Dynamic Characteristics of Composite Sandwich Panel with Triangular Chiral (Tri-Chi) Honeycomb under Random...

Area of Science:

• Materials Science
• Mechanical Engineering
• Structural Dynamics

Background:

• Composite sandwich panels (CSP) with triangular chiral (Tri-Chi) honeycomb cores exhibit unique Poisson's ratio (PR) and stiffness properties.
• Understanding the random vibration behavior of these structures is crucial for their application in demanding environments.

Purpose of the Study:

• To develop and validate a precise model for assessing the random vibration characteristics of composite sandwich panels with Tri-Chi honeycomb cores (CSP-TCH).
• To identify key structural parameters influencing the vibration response of CSP-TCH.

Main Methods:

• A two-dimensional equivalent Reissner-Mindlin model (2D-ERM) was formulated using the variational asymptotic method.
• Numerical simulations, including 3D finite element analysis (FEA), power spectral density (PSD) curves, and root mean square (RMS) responses, were employed for validation.
• Modal analysis was conducted to assess natural frequencies and modal reliability.

Main Results:

• The 2D-ERM demonstrated high accuracy, with relative errors below 7% for natural frequencies and below 5% for PSD and RMS values compared to 3D FEA.
• The ligament-rib angle of the core and the layup modes of the composite facesheets were identified as critical factors influencing vibration.
• The Poisson's ratio of the core layer significantly impacts vibration properties, shifting from negative to positive values.

Conclusions:

• The developed 2D-ERM provides a rapid and accurate method for analyzing the random vibration of CSP-TCH.
• Optimizing the ligament-rib angle and facesheet layup is essential for tailoring the vibration performance of these composite structures.