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Crashworthiness of 3D Lattice Topologies under Dynamic Loading: A Comprehensive Study
Autumn R Bernard1, Mostafa S A ElSayed1
1Mechanical and Aerospace Engineering, Carleton University, Ottawa, ON K1S 5B6, Canada.
This study comprehensively evaluated 24 lattice topologies for crashworthiness under dynamic impact. Topologies with struts aligned in the impact direction showed lower energy absorption efficiency.
Area of Science:
- Materials Science
- Mechanical Engineering
- Computational Solid Mechanics
Background:
- Periodic truss-based lattice materials offer superior properties over monolithic materials.
- Additive manufacturing enables fabrication of complex lattice structures, increasing research interest.
- Inconsistent analysis methods hinder comparison of crashworthiness data across studies.
Purpose of the Study:
- To comprehensively study the impact performance and crashworthiness of 24 lattice topologies.
- To identify trends in energy absorption and impact efficiency for various lattice designs.
- To investigate the influence of strut alignment on crashworthiness.
Main Methods:
- Numerical simulation of dynamic impact loading on 24 lattice topologies.
- Utilized steel alloy parent material fabricated via Selective Laser Melting.
- Tested 16 impact energy-speed pairs across three relative densities.
Main Results:
- Observed overarching trends in plateau stress, densification strain, impact efficiency, and absorbed energy.
- No distinct division found between bending and stretching topologies' performance.
- Topologies with struts aligned in the impact direction exhibited lower energy absorption efficiency.
Conclusions:
- The alignment of struts significantly impacts lattice crashworthiness and energy absorption.
- This comprehensive study provides valuable data for selecting lattice topologies for impact applications.
- Standardized analysis is needed for better comparison of lattice material performance in literature.
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