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Free Vibration Behavior of CFRP Composite Sandwich Open Circular Cylindrical Shells with 3D Reentrant Negative
1School of Aerospace Engineering, Xiamen University, Xiamen 361005, China.
Polymers
|September 13, 2025
Summary
This study investigates the vibration of carbon fiber sandwich shells with auxetic cores. Findings align theoretical models with experimental tests, offering insights for vibration mitigation in lightweight metamaterial structures.
Area of Science:
- Materials Science
- Mechanical Engineering
- Structural Dynamics
Background:
- Sandwich structures offer high stiffness-to-weight ratios.
- Auxetic metamaterials exhibit unique negative Poisson's ratio properties.
- Understanding vibration behavior is crucial for structural integrity and performance.
Purpose of the Study:
- To explore the free vibration behavior of carbon fiber-reinforced sandwich open circular cylindrical shells with 3D reentrant auxetic cores (3D RSOCCSs).
- To validate theoretical predictions against experimental modal tests.
- To analyze the influence of design parameters on vibration characteristics.
Main Methods:
- Integration of the Rayleigh-Ritz method (RRM) and Reddy's third-order shear deformation theory (TOSDT) for theoretical analysis.
- Finite element analysis (FEA) for simulation predictions.
- Experimental modal testing using hammer excitation for modal characteristic determination.
Main Results:
- Predicted modal properties showed good agreement with experimental results.
- The study successfully characterized the free vibration behavior of 3D RSOCCSs.
- Influences of fiber ply angles and geometric parameters on natural frequencies were analyzed.
Conclusions:
- The combined RRM and TOSDT model accurately predicts the vibration of 3D RSOCCSs.
- Experimental validation confirms the theoretical framework.
- The findings provide valuable insights for designing lightweight auxetic metamaterial shells for vibration mitigation in engineering applications.
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