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Mechanical behavior and energy absorption capability of trigonometric function curved rod cell-based lattice
Linlin Zhang1, Junwei Wu1, Yuejing Zhao1
1School of Mechanical Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, China.
Scientific Reports
|July 2, 2025
Summary
Novel trigonometric function-modulated lattice structures significantly improve mechanical performance. These enhanced designs, validated by additive manufacturing and simulations, offer superior strength and energy absorption compared to traditional body-centered cubic (BCC) lattices.
Area of Science:
- Materials Science
- Mechanical Engineering
- Additive Manufacturing
Background:
- Traditional body-centered cubic (BCC) lattice metamaterials face limitations due to structural discontinuities and stress concentrations.
- These deficiencies hinder the optimization of mechanical properties in BCC lattice structures.
Purpose of the Study:
- To introduce a novel lattice design methodology using trigonometric function-modulated strut axes.
- To enhance structural performance through fillet transition technology and investigate the mechanical behavior of new lattice configurations.
Main Methods:
- Development of three trigonometric function curved rod cell-based lattice structures (TCRC, SCRC, CCRC) and their fillet-enhanced variants (TCRC-ipv, SCRC-ipv, CCRC-ipv).
- Fabrication of experimental specimens using selective laser melting (SLM) additive manufacturing.
- Quasi-static compression testing and nonlinear finite element method (FEM) simulations to analyze mechanical response.
Main Results:
- Trigonometric function-based topology optimization and nodal fillet design significantly improve overall structural performance.
- The TCRC-ipv configuration demonstrated optimal properties, with a 39.2% increase in elastic modulus, 59.4% in peak compressive strength, and 46.1% in yield strength compared to BCC.
- Energy absorption capacity saw a 10.3% rise in the stress plateau and an 86.1% augmentation in specific energy absorption.
Conclusions:
- The proposed trigonometric function-based lattice design strategy, combined with fillet optimization, effectively overcomes the limitations of traditional BCC structures.
- The TCRC-ipv lattice shows superior mechanical properties and energy absorption capabilities, offering a promising alternative for engineering applications.
- This work establishes a new framework for topology optimization of lattice metamaterials through multiscale collaborative optimization.
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