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Related Experiment Video

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Design and Optimization Strategies of a High-Performance Vented Box

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Published on: June 9, 2023

Investigating the Effective Performance of Sandwich Panel with Petal Star-Triangular Core Using VAM-Based Equivalent

Xinlong Yang^1,2, Zhen Wang^1,2, Yifeng Zhong^1,2

¹School of Civil Engineering, Chongqing University, Chongqing 400045, China.

Materials (Basel, Switzerland)

|September 23, 2022

Summary

A novel petal-triangle core sandwich panel (SP-PSC) enhances the negative Poisson

Keywords:

honeycomb sandwich panel negative Poisson’s ratio static and dynamic performance variational asymptotic method

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Area of Science:

Materials Science
Mechanical Engineering
Composite Materials

Background:

Traditional sandwich panels lack advanced auxetic properties.
Lightweight, high-strength structures are crucial for various engineering applications.
Improving the negative Poisson's ratio (NPR) effect in sandwich panels is an active research area.

Purpose of the Study:

To propose and analyze a novel petal-triangle core sandwich panel (SP-PSC) with enhanced NPR.
To develop an efficient equivalent two-dimensional model (2D-EPM) for analyzing complex core structures.
To investigate the influence of material anisotropy and geometric parameters on SP-PSC performance.

Main Methods:

Development of a variational asymptotic method-based equivalent two-dimensional model (2D-EPM).
Validation of 2D-EPM using three-point bending experiments and 3D finite element (FE) models.
Parametric study on geometric parameters and material anisotropy (CFPR) effects on NPR and stiffness.
Proposal and comparison of improved core designs (PSC-X and DSC).

Main Results:

The 2D-EPM accurately predicts the behavior of SP-PSC under various conditions.
Maximum NPR is achieved with unidirectional CFPR facesheets at a fiber angle of 40-50 degrees.
Improved core designs (PSC-X, DSC) demonstrate enhanced equivalent stiffness and reduced stress concentration compared to the original plate.
The study provides insights into optimizing NPR through material selection and geometric design.

Conclusions:

The proposed SP-PSC offers improved NPR while maintaining lightweight and high-strength characteristics.
The 2D-EPM is a reliable and efficient tool for analyzing complex sandwich panel structures.
Material anisotropy, particularly fiber angle in CFPR, significantly influences the NPR effect.
Novel core designs show potential for superior mechanical performance in advanced composite structures.