Bio-inspired repeatable lattice structures for energy absorption: Experimental and finite element study

Sharma, Deepak; Hiremath, Somashekhar S.

doi:10.1016/j.compstruct.2021.115102

Cited by 77 publications

(26 citation statements)

References 49 publications

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“…The porosity of the scaffolds proposed in this paper with different geometric parameters was variable, so the specific energy absorption (SEA) criterion was introduced using the equation, 36 where EA is the energy absorbed per unit volume and M is the mass of the sample.…”

Section: Methodsmentioning

confidence: 99%

Mechanical and permeability properties of porous scaffolds developed by a Voronoi tessellation for bone tissue engineering

Zhao

Yao

et al. 2022

J. Mater. Chem. B

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Section: Methodsmentioning

confidence: 99%

Mechanical and permeability properties of porous scaffolds developed by a Voronoi tessellation for bone tissue engineering

Zhao

Yao

et al. 2022

J. Mater. Chem. B

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“…However, this study considers both open and close cell based thin tubes to generalize the concept. In the previous study, the effect of design parameters on the energy absorption behavior of the thermoplastic made lattice structure has been studied; detailed explanation about the architecture of E. aspergillum can be found in the work of Sharma and Hiremath 38 . The results showed that the ratio of diagonal strut thickness ( d 2 ) to horizontal strut thickness ( d 1 ) of 0.5 gives a stable local buckling response and high energy absorption performance.…”

Section: Methodsmentioning

confidence: 99%

“…In the previous study, the effect of design detailed explanation about the architecture of E. aspergillum can be found in the work of Sharma and Hiremath. 38 The results showed that the ratio of diagonal strut thickness (d 2 ) to horizontal strut thickness (d 1 ) of 0.5 gives a stable local buckling response and high energy absorption performance. Therefore, in this study, same Thin tubes are fabricated using an EOS M-280 LPBF machine equipped with a Yb-fiber laser.…”

Section: Design and Fabricationmentioning

confidence: 96%

“…Due to the diagonal strut reinforcement, Euplectella aspergillum-based lattice structures showed good buckling-resistant properties. 38 However, the strut-based design can significantly increase the residual stresses near the joints. Such stress concentration sites can be characterized as damage initiation zones.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, it is clear that it is difficult to improve the fatigue properties of the lattice structure while maintaining low elastic modulus and high ductility. Due to the diagonal strut reinforcement, Euplectella aspergillum ‐based lattice structures showed good buckling‐resistant properties 38 . However, the strut‐based design can significantly increase the residual stresses near the joints.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of heat treatment on the variable amplitude fatigue life and microstructure of the novel bioinspired Ti‐6Al‐4V thin tubes fabricated using Selective Laser Melting process

Sharma

Hiremath

Kenchappa

2022

Fatigue Fract Eng Mat Struct

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In this study, thin tubes are mimicked based on the architecture of Euplectella aspergillum and studied for fatigue performance under variable amplitude loading. The thin tubes are fabricated with Ti-6Al-4V material using the selective laser melting (SLM) process. SLM printed components are always subjected to residual stresses, which can reduce fatigue performance of the components. Heat treatment effect on the fatigue performance, microstructure, and residual stress is studied. Complex geometry and sharp corners in the bioinspired tubes result in stress concentration, which further reduces the fatigue performance. The value of residual stresses at the sharp corners is dependent on the height of the tube, thickness of struts, and intersection of different struts. Heat treatment significantly reduces the residual stresses and increases the fatigue life of the thin tubes; however, strength decreases after heat treatment. Heat-treated thin tubes showed a higher concentration of (α + β) phase, which results in decreased residual stress and improved ductility of the thin tubes. Advanced bionic thin tubes can be used for lightweight crash boxes, sandwich panels, bio-implants, grid stiffened structures, etc.

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3D‐Printed Soft and Hard Meta‐Structures with Supreme Energy Absorption and Dissipation Capacities in Cyclic Loading Conditions

et al. 2022

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The main objective of this article is to introduce novel 3D bio‐inspired auxetic meta‐structures printed with soft/hard polymers for energy absorption/dissipation applications under single and cyclic loading–unloading. Meta‐structures are developed based on understanding the hyper‐elastic feature of thermoplastic polyurethane (TPU) polymers, elastoplastic behavior of polyamide 12 (PA 12), and snowflake inspired design, derived from theory and experiments. The 3D meta‐structures are fabricated by multi‐jet fusion 3D printing technology. The feasibility and mechanical performance of different meta‐structures are assessed experimentally and numerically. Computational finite element models (FEMs) for the meta‐structures are developed and verified by the experiments. Mechanical compression tests on TPU auxetics show unique features like large recoverable deformations, stress softening, mechanical hysteresis characterized by non‐coincident compressive loading–unloading curve, Mullins effect, cyclic stress softening, and high energy absorption/dissipation capacity. Mechanical testing on PA 12 meta‐structures also reveals their elastoplastic behavior with residual strains and high energy absorption/dissipation performance. It is shown that the developed FEMs can replicate the main features observed in the experiments with a high accuracy. The material‐structural model, conceptual design, and results are expected to be instrumental in 3D printing tunable soft and hard meta‐devices with high energy absorption/dissipation features for applications like lightweight drones and unmanned aerial vehicles (UAVs).

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Bio-inspired repeatable lattice structures for energy absorption: Experimental and finite element study

Cited by 77 publications

References 49 publications

Mechanical and permeability properties of porous scaffolds developed by a Voronoi tessellation for bone tissue engineering

Mechanical and permeability properties of porous scaffolds developed by a Voronoi tessellation for bone tissue engineering

Effect of heat treatment on the variable amplitude fatigue life and microstructure of the novel bioinspired Ti‐6Al‐4V thin tubes fabricated using Selective Laser Melting process

3D‐Printed Soft and Hard Meta‐Structures with Supreme Energy Absorption and Dissipation Capacities in Cyclic Loading Conditions

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