A Novel Lattice Structure for Enhanced Crush Energy Absorption

Seek, Chang Yuan; Kok, Chee Kuang; Lim, Chong Hooi; Liew, Kia Wai

doi:10.14716/ijtech.v13i5.5829

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…To assess the performance of the bioinspired lattices, they were compared to relevant results from the literature. In an earlier work by Seek et al, the performance of traditional PLA lattice structures, such as simple cubic (SC), honeycomb (HC), body-centred cubic (BCC), and PeckGy80 (PG80), was investigated [ 55 ]. The relative density was in the range of 0.16 to 0.38, which is similar to the range of the bioinspired lattices (from 0.15 to 0.40).…”

Section: Resultsmentioning

confidence: 99%

Designing Lightweight 3D-Printable Bioinspired Structures for Enhanced Compression and Energy Absorption Properties

Harish,

Alsaleh,

Ahmadein

et al. 2024

Polymers

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Recent progress in additive manufacturing, also known as 3D printing, has offered several benefits, including high geometrical freedom and the ability to create bioinspired structures with intricate details. Mantis shrimp can scrape the shells of prey molluscs with its hammer-shaped stick, while beetles have highly adapted forewings that are lightweight, tough, and strong. This paper introduces a design approach for bioinspired lattice structures by mimicking the internal microstructures of a beetle’s forewing, a mantis shrimp’s shell, and a mantis shrimp’s dactyl club, with improved mechanical properties. Finite element analysis (FEA) and experimental characterisation of 3D printed polylactic acid (PLA) samples with bioinspired structures were performed to determine their compression and impact properties. The results showed that designing a bioinspired lattice with unit cells parallel to the load direction improved quasi-static compressive performance, among other lattice structures. The gyroid honeycomb lattice design of the insect forewings and mantis shrimp dactyl clubs outperformed the gyroid honeycomb design of the mantis shrimp shell, with improvements in ultimate mechanical strength, Young’s modulus, and drop weight impact. On the other hand, hybrid designs created by merging two different designs reduced bending deformation to control collapse during drop weight impact. This work holds promise for the development of bioinspired lattices employing designs with improved properties, which can have potential implications for lightweight high-performance applications.

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Section: Resultsmentioning

confidence: 99%

Designing Lightweight 3D-Printable Bioinspired Structures for Enhanced Compression and Energy Absorption Properties

Harish,

Alsaleh,

Ahmadein

et al. 2024

Polymers

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“…[2] The lattice structure is a 3D open-cell polymer structure, which has emerged as a main candidate material for energy-absorbing structures and has attracted the attention and research of many researchers due to the existence of large cavities inside the lattice structure, which is capable of large plastic deformation and presents a strong energy absorption capacity. [3][4][5] The pore size of the lattice structure is optimized to obtain a lattice structure with a density gradient usually called a functionally graded lattice structure. Functionally graded lattice structures have been found to exhibit different deformation behavior from uniform lattice structures under compressive loading.…”

Section: Introductionmentioning

confidence: 99%

“…[ 2 ] The lattice structure is a 3D open‐cell polymer structure, which has emerged as a main candidate material for energy‐absorbing structures and has attracted the attention and research of many researchers due to the existence of large cavities inside the lattice structure, which is capable of large plastic deformation and presents a strong energy absorption capacity. [ 3–5 ]…”

Section: Introductionmentioning

confidence: 99%

Mechanical Response and Energy Absorption of 316L Stainless Steel Body‐Centered‐Cubic Functionally Graded Lattice Structures under Quasistatic Compressive Test

Shi,

Lin,

et al. 2023

Adv Eng Mater

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Five different density gradient variation strategies are proposed for body‐centered‐cubic (BCC) lattice structures in parallel to the loading direction prepared by selective laser melting with 316 L stainless steel as the building material, and the mechanical properties, deformation behavior, and energy absorption capacity of lattice structures with different density gradient variations and uniform lattice structure under compressive loading are investigated and compared. The results show that the elastic modulus and compressive strength of the uniform lattice structure are better than those of the lattice structure with density gradient parallel to the loading direction, provided that the relative densities are similar. However, through a reasonable design of density gradient, the lattice structure with density gradient parallel to the loading direction can obtain higher plateau stress than the uniform lattice structure and increase the onset densification strain to a certain extent, which obviously improves the energy absorption capacity of the lattice structure. The results obtained by finite‐element calculations are in good agreement with the experimental results and can better restore the deformation behavior of the lattice structure under compressive loading. This work provides inspiration for the design of the density gradient of the lattice structure.

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Programmable heterogeneous lamellar lattice architecture for dual mechanical protection

Tian,

Zhang,

Hou

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

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Shear bands frequently appear in lattice architectures subjected to compression, leading to an unstable stress–strain curve and global deformation. This deformation mechanism reduces their energy absorption and loading-bearing capacity and causes the architectures to prioritize mechanical protection of external components at the expense of the entire structure. Here, we leverage the design freedom offered by additive manufacturing and the geometrical relation of dual-phase nanolamellar crystals to fabricate heterogeneous lamellar lattice architectures consisting of body-centered cubic (BCC) and face-centered cubic (FCC) unit cells in alternating lamella. The lamellar lattice demonstrates more than 10 and 9 times higher specific energy absorption and energy absorption efficiency, respectively, compared to the BCC lattice. The drastic improvement arises as the nucleation of shear bands is inhibited by the discrete energy threshold for plastic buckling of adjacent heterogeneous lattice lamella during loading. Despite its lower density than the FCC lattice, the lamellar lattice exhibits significant enhancement in plateau stress and crushing force efficiency, attributed to the strengthening effect induced by simultaneous deformation of unit cells in the BCC lattice lamella and the resulting cushion shielding effect. The design improves the global mechanical properties, making lamellar lattices compare favorably against numerous materials proposed for mechanical protection. Additionally, it provides opportunities to program the local mechanical response, achieving programmable internal protection alongside overall external protection. This work provides a different route to design lattice architecture by combining internal and external dual mechanical protection, enabling a generation of multiple mechanical protectors in aerospace, automotive, and transportation fields.

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A Novel Lattice Structure for Enhanced Crush Energy Absorption

Cited by 3 publications

References 22 publications

Designing Lightweight 3D-Printable Bioinspired Structures for Enhanced Compression and Energy Absorption Properties

Designing Lightweight 3D-Printable Bioinspired Structures for Enhanced Compression and Energy Absorption Properties

Mechanical Response and Energy Absorption of 316L Stainless Steel Body‐Centered‐Cubic Functionally Graded Lattice Structures under Quasistatic Compressive Test

Programmable heterogeneous lamellar lattice architecture for dual mechanical protection

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