Design Optimization of Additive Manufactured Edgeless Simple Cubic Lattice Structures under Compression

Park, Kwang-Min; Roh, Young-Sook

doi:10.3390/ma16072870

Cited by 4 publications

(3 citation statements)

References 45 publications

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“…Concerning the engineering and optimization of the joints in the lattice metamaterials we can also mention the previous works, in which of stress concentration at the intersection between the joints was reduced by using fillets and other smoothed geometry [43][44][45] and by using tapered struts 46,47 . Such design approaches, generally, can be combined with the presented one to obtain the synergistic effects.…”

Section: Introductionmentioning

confidence: 94%

Improved mechanical performance of quasi-cubic lattice metamaterials with asymmetric joints

Solyaev

Ustenko

Babaytsev

et al. 2023

Preprint

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In this paper, we propose a simple method for the modification of the unit cells in the lattice metamaterials that provides an improvement of their impact strength. The idea is based on the introduction of small mutual offsets of the interconnected struts inside the unit cells. In such way, the joints between the struts become asymmetric and the overall geometry of the unit cells can be defined as the quasi-cubic with the axis of chirality. Considering four types of cubic lattices with BCC, BCT, FCC and octahedron structures, we modified their geometry and investigated the influence of the offsets and the unit cell size on the overall performance in static and dynamic tests. From the experiments we found that the small offsets (less than the strut diameter) can allow to increase the impact strength of 3d-printed polymeric specimens in 1.5-3 times remaining almost the same density and static mechanical properties. Based on the numerical simulations, we show that the explanation of the observed phenomena can be related to the increase of plastic deformations and damage accumulation in the unit-cells with asymmetric joints leading to the transition from the quasi-brittle to the ductile type of fracture in tested specimens.

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Section: Introductionmentioning

confidence: 94%

Improved mechanical performance of quasi-cubic lattice metamaterials with asymmetric joints

Solyaev

Ustenko

Babaytsev

et al. 2023

Preprint

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“…Most conventional techniques produce pores by subtraction. On the other hand, current additive manufacturing techniques, also called solid free-form fabrication techniques, offer the ability to individualize scaffolds and generate complex geometries with precisely controlled porosity [24].…”

Section: Fabricationmentioning

confidence: 99%

Design, In Vitro Evaluation and In Vivo Biocompatibility of Additive Manufacturing Three-Dimensional Printing of β beta-Tricalcium Phosphate Scaffolds for Bone Regeneration

Llorente,

Junquera,

Gallego

et al. 2024

Biomedicines

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The reconstruction of bone deficiencies remains a challenge due to the limitations of autologous bone grafting. The objective of this study is to evaluate the bone regeneration efficacy of additive manufacturing of tricalcium phosphate (TCP) implants using lithography-based ceramic manufacturing (LCM). LCM uses LithaBone TCP 300 slurry for 3D printing, producing cylindrical scaffolds. Four models of internal scaffold geometry were developed and compared. The in vitro studies included cell culture, differentiation, seeding, morphological studies and detection of early osteogenesis. The in vivo studies involved 42 Wistar rats divided into four groups (control, membrane, scaffold (TCP) and membrane with TCP). In each animal, unilateral right mandibular defects with a total thickness of 5 mm were surgically performed. The animals were sacrificed 3 and 6 months after surgery. Bone neoformation was evaluated by conventional histology, radiology, and micro-CT. Model A (spheres with intersecting and aligned arrays) showed higher penetration and interconnection. Histological and radiological analysis by micro-CT revealed increased bone formation in the grafted groups, especially when combined with a membrane. Our innovative 3D printing technology, combined with precise scaffold design and efficient cleaning, shows potential for bone regeneration. However, further refinement of the technique and long-term clinical studies are crucial to establish the safety and efficacy of these advanced 3D printed scaffolds in human patients.

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“…In the field of engineering and optimization of the joints in the lattice metamaterials, we can also mention the prior studies, where the issue of stress concentration at the joint between the struts have been addressed. Some strategies involved incorporating fillets and other smoothed geometries 44 – 46 , while others explored the use of tapered struts 47 , 48 . These design approaches can be synergistically combined with our proposed method.…”

Section: Introductionmentioning

confidence: 99%

Improved mechanical performance of quasi-cubic lattice metamaterials with asymmetric joints

Solyaev,

Ustenko,

Babaytsev

et al. 2023

Sci Rep

View full text Add to dashboard Cite

In this paper, we propose a simple method for the modification of the unit cells in the lattice metamaterials that provides an improvement of their impact strength. The idea is based on the introduction of small mutual offsets of the interconnected struts inside the unit cells. In such way, the joints between the struts become asymmetric and the overall geometry of the unit cells can be defined as the quasi-cubic with the axis of chirality. Considering four types of cubic lattices with BCC, BCT, FCC and octahedron structures, we modified their geometry and investigated the influence of the offsets and the unit cell size on the overall performance in static and dynamic tests. From the experiments we found that the small offsets (less than the strut diameter) can allow to increase the impact strength of 3d-printed polymeric specimens in 1.5–3 times remaining almost the same density and static mechanical properties. Based on the numerical simulations, we show that the explanation of the observed phenomena can be related to the increase of plastic deformations and damage accumulation in the unit-cells with asymmetric joints leading to the transition from the quasi-brittle to the ductile type of fracture in tested specimens.

show abstract

Design Optimization of Additive Manufactured Edgeless Simple Cubic Lattice Structures under Compression

Cited by 4 publications

References 45 publications

Improved mechanical performance of quasi-cubic lattice metamaterials with asymmetric joints

Improved mechanical performance of quasi-cubic lattice metamaterials with asymmetric joints

Design, In Vitro Evaluation and In Vivo Biocompatibility of Additive Manufacturing Three-Dimensional Printing of β beta-Tricalcium Phosphate Scaffolds for Bone Regeneration

Improved mechanical performance of quasi-cubic lattice metamaterials with asymmetric joints

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