An Improved C₀ FE Model for the Sandwich Lattice Composite Panel

Area of Science:

• Composite Materials Engineering
• Structural Analysis
• Computational Mechanics

Background:

• Sandwich lattice composite panels are increasingly used in structural applications.
• Accurate and efficient analysis models are crucial for their design and optimization.
• Conventional 3D hybrid element models can be computationally intensive and complex to implement.

Purpose of the Study:

• To develop a novel analysis model for sandwich lattice composite panels.
• To validate the model's accuracy against experimental data.
• To establish the model as an efficient alternative to traditional analysis methods.

Main Methods:

• Development of an analysis model combining improved C0 plate elements with high-order zigzag theories.
• Integration of a beam element degenerated from the plate element.
• Numerical calculations and comparison with experimental results (mid-span deflections, surface sheet normal stresses).

Main Results:

• The developed model demonstrated excellent agreement with experimental test results.
• Numerical calculations confirmed the model's accuracy in predicting deflections and stresses.
• The model effectively avoids the complexity and coupling issues associated with 3D hybrid element models.

Conclusions:

• The proposed analysis model is a highly efficient and accurate tool for sandwich lattice composite panels.
• This method offers significant advantages over conventional 3D hybrid element models.
• The model has strong potential for practical engineering analysis and design.