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Mechanical Behavior of a Reinforced Hourglass Lattice Structure
Chong Liu1, Wen Yang1,2, Baifeng Sha1
1School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255000, China.
Materials (Basel, Switzerland)
|February 27, 2026
Summary
A novel reinforced hourglass lattice structure enhances compressive performance in sandwich structures. This design improves face-core interaction and prevents buckling, leading to superior stiffness and strength.
Area of Science:
- Materials Science
- Mechanical Engineering
- Structural Engineering
Background:
- Conventional lattice sandwich structures suffer from limited compressive performance due to poor face-core interaction and premature face-sheet buckling.
- Networked venation structures in nature inspire new designs for enhanced mechanical properties.
Purpose of the Study:
- To propose and investigate a reinforced hourglass lattice structure to overcome limitations in conventional designs.
- To enhance the compressive performance of lattice sandwich structures through improved face-core connectivity and buckling resistance.
Main Methods:
- Fabrication of the reinforced hourglass lattice structure using cutting-interlocking assembly and vacuum brazing.
- Quasi-static in-plane and out-of-plane compression experiments.
- Finite element simulations and theoretical analysis to investigate compressive behavior.
Main Results:
- Out-of-plane compressive strength increases monotonically with relative density.
- The reinforced structure shows improved face-core load transfer and suppressed local buckling compared to conventional designs.
- Demonstrated higher initial stiffness, enhanced compressive strength, and superior structural stability.
Conclusions:
- Reinforcing the hourglass core is an effective strategy to improve compressive performance in lattice sandwich structures.
- The proposed design strengthens face-core interaction and mitigates face-sheet buckling.
- This approach offers a pathway to advanced materials with superior mechanical properties.
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