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Programmable heterogeneous lamellar lattice architecture for dual mechanical protection
Yuanyuan Tian1,2, Xin Zhang3, Boyuan Hou2
1HP-NTU Digital Manufacturing Corporate Lab, Nanyang Technological University, Singapore 639798, Singapore.
Summary
This study introduces novel heterogeneous lamellar lattice architectures that significantly enhance energy absorption and mechanical protection. These designs prevent shear band formation, improving performance for aerospace and automotive applications.
Area of Science:
- Materials Science
- Mechanical Engineering
- Additive Manufacturing
Background:
- Lattice architectures often form shear bands under compression, reducing energy absorption and load-bearing capacity.
- This instability compromises structural integrity, favoring external protection over global performance.
Purpose of the Study:
- To design heterogeneous lamellar lattice architectures with enhanced mechanical properties using additive manufacturing.
- To investigate the inhibition of shear band formation and improve energy absorption and protection capabilities.
Main Methods:
- Fabrication of heterogeneous lamellar lattices with alternating body-centered cubic (BCC) and face-centered cubic (FCC) unit cells.
- Utilizing additive manufacturing and exploiting dual-phase nanolamellar crystal geometry.
- Analyzing the mechanical response under compression, focusing on energy absorption and deformation mechanisms.
Main Results:
- The lamellar lattice showed over 10x higher specific energy absorption and 9x higher energy absorption efficiency than BCC lattices.
- Shear band nucleation was inhibited due to the discrete energy threshold for plastic buckling in adjacent heterogeneous lamellae.
- Enhanced plateau stress and crushing force efficiency were observed, attributed to simultaneous BCC unit cell deformation and shielding effects.
Conclusions:
- Heterogeneous lamellar lattices offer superior energy absorption and mechanical protection compared to traditional designs.
- The design enables programmable local mechanical responses for dual internal and external protection.
- This approach provides a new pathway for developing advanced mechanical protectors in various industries.
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