Numerical and experimental investigations on the mechanical properties of cellular structures with open Kelvin cells

Şerban, Dan Andrei; Negru, Radu; Sărăndan, Sorin; Belgiu, George; Marșavina, Liviu

doi:10.1080/15376494.2019.1669093

Cited by 13 publications

(10 citation statements)

References 25 publications

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“…For the material model, a isotropic linear elastic formulation was used with Young's modulus E solid = 1500 MPa and a Poisson's ratio ν solid = 0:3, corresponding an ABS compound (VeroWhitePlus RGD835) used in photopolymerization rapid prototyping [3]. The analyses were performed in Abaqus using the Standard solver.…”

Section: Resultsmentioning

confidence: 99%

“…The relative density of the structures ρ/ρ s is expressed as the ratio between the density of the structure and the density of the solid. This relation can be extrapolated for any base material through expressing the relative density as the ratio between the volume of the structure V structure and the volume of the circumscribed prism V prism [3].…”

Section: The 3d Reentrant Structurementioning

confidence: 99%

“…The scope of the engineered cells and patterns is to overcome the issue of mechanical property scaling with density that occurs for regular structures: E str /E sol ∝ ðρ str /ρ sol Þ n (where E str and ρ str are the structure stiffness and density, and E sol and ρ sol are the stiffness and density of the solid) [2]. Practical applications of mechanical metamaterial cellular plastics are scarce due to the high expenses associated with their manufacturing, usually consisting of rapid prototyping (RP) [3][4][5]. However, if proven to possess outstanding properties, this class of materials can be used in highend applications, where the cost of production is not considered a priority.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Variation of Poisson’s Ratio with Axial Strain for Three-Dimensional Reentrant Auxetic Structures

Şerban

2022

Material Design & Processing Communications

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Section: Resultsmentioning

confidence: 99%

Section: The 3d Reentrant Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Variation of Poisson’s Ratio with Axial Strain for Three-Dimensional Reentrant Auxetic Structures

Şerban

2022

Material Design & Processing Communications

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“…The specimen featured a circumscribed square with 50 mm sides and two fillet radii (R 1 = 33 mm and R 2 = 1.5 mm, Figure 1) in order to ensure stress concentration in the middle of the specimen and, consequently, a more facile identification of the first yield region. The samples were manufactured through rapid prototyping using the PolyJet™ technology [14].…”

Section: Methodsmentioning

confidence: 99%

A Study of Yielding and Plasticity of Rapid Prototyped ABS

et al. 2021

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In this article, the yielding and plastic flow of a rapid-prototyped ABS compound was investigated for various plane stress states. The experimental procedures consisted of multiaxial tests performed on an Arcan device on specimens manufactured through photopolymerization. Numerical analyses were employed in order to determine the yield points for each stress state configuration. The results were used for the calibration of the Hosford yield criterion and flow potential. Numerical analyses performed on identical specimen models and test configurations yielded results that are in accordance with the experimental data.

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“…The above studies mainly focus on the quasi-static compression responses [22,23,26,27] of Dodeca and Octa structures. To date, experimental evidence on how we can improve the dynamic impact behavior of Dodeca and Octa has not been systematically discussed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Impact Behavior of Strut-Based Cellular Structures Designed by Spatial Voronoi Tessellation

Zhang

Guo

et al. 2022

Metals

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Porous materials have significant advantages, such as their light weight and good specific energy absorption. This paper presents the designs of two ordered Voronoi structures, a truncated octahedron (Octa) and a rhombic dodecahedron (Dodeca), based on spatial Voronoi tessellation. Through a numerical analysis, the dynamic behavior, deformation and energy absorption of the two porous structures under different impact energies were explored. According to the energy-absorption index, the effects of porosity, rotating unit cell and unit-cell shape on the energy absorption of the porous structures were quantitatively evaluated. The study shows that, for Dodeca and Octa structures subjected to various impact energies, the force-displacement curves exhibit three modes. The porosity, rotational unit cell and unit-cell shape play a crucial role in affecting the impact resistance of porous structures. The work in this paper proposes an effective way to improve the energy-absorption capacity of porous structures under different impact energies. At the same time, a new understanding of the deformation mechanism of Octa and Dodeca was obtained, which is significant for the impact-resistance design and energy-absorption evaluation of porous structures.

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Numerical and experimental investigations on the mechanical properties of cellular structures with open Kelvin cells

Cited by 13 publications

References 25 publications

Variation of Poisson’s Ratio with Axial Strain for Three-Dimensional Reentrant Auxetic Structures

Variation of Poisson’s Ratio with Axial Strain for Three-Dimensional Reentrant Auxetic Structures

A Study of Yielding and Plasticity of Rapid Prototyped ABS

Numerical Investigation of Impact Behavior of Strut-Based Cellular Structures Designed by Spatial Voronoi Tessellation

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