Characterization of additively manufactured triply periodic minimal surface structures under compressive loading

Buil, Ramón Miralbés; Ranz, David; Pascual, Francisco Javier; Zouzias, Dimitris; Maza, Mario

doi:10.1080/15376494.2020.1842948

Cited by 35 publications

(13 citation statements)

References 52 publications

(44 reference statements)

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“…In relationship with the previous studies of the capability of TPMS to absorb energy, it must be highlighted that, despite there are some experimental studied of the behavior of these materials under quasi static load or with a low strain rate (0.001 s -1 to 0.01 s -1 ) 20,26,30 , there are only a few that study these materials under dynamic loads and analyzes the influence of the strain rate. In the case of McKown et al 19 , they study the behavior of octahedral lattice structure under quasi-static and low strain rate (0.001 to 0.5 s -1 ) load cases and also under blast loading (10 3 s -1 ) using a drop tower.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and energy–absorption capabilities of thermoplastic sheet gyroid structures

Higuera

Buil

Ranz

2021

Mechanics of Advanced Materials and Structures

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Mechanical properties and energy-absorption capabilities of thermoplastic sheet gyroid structuresThe development of additive manufacturing and lattice structures has created opportunities for the development of lightweight impact-absorption structures that can overcome most constraints of previously used materials such as expanded polystyrene foams. However, for the successful application of such structures, the effects of their variables and performance must be established. In this study, the mechanical properties and energy absorption of thermoplastic sheet gyroid structures were investigated and compared with the performance of current materials. Consequently, the specimens were tested after changing the main variables, i.e., cell size and volume fraction, of various thermoplastic materials such as acrylonitrile butadiene styrene, polylactic acid, thermoplastic polyurethane, and polyamide 12. Finally, they were tested in a quasi-static compression test and their deformation stages were photographed. The stressstrain curves of all materials changed after adopting the sheet gyroid structure, exhibiting three distinct regions: linear elastic, long collapse plateau, and densification that made them particularly applicable for energy absorption.Volume fraction affected the layer collapse. The elastic geometrical stiffness increased for higher volume fractions and smaller cells. In addition, the peak and plateau stresses increased at higher volume fractions, and while smaller cells were not directly affected, the area under the curves were. Hence, for most materials, specific energy absorption was larger for higher volume fractions and smaller cells. The constituent material properties contributed significantly to the structural behavior, exhibiting three primary deformation mechanisms, i.e., elastomeric, elastic-plastic, and elastic-brittle, resulting in a wide spectrum of properties for each application requirement. The comparison of the optimal properties with the expanded polystyrene demonstrated the ability of sheet gyroid structures to overcome most of its challenges, exhibiting a superior specific energy absorption, ability to withstand various impacts, letting air flow in its all axes, and being recyclable. Thus, sheet gyroid structures can be considered promising alternatives.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties and energy–absorption capabilities of thermoplastic sheet gyroid structures

Higuera

Buil

Ranz

2021

Mechanics of Advanced Materials and Structures

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“…Other studies of gyroid structures 21 10 4 pointed out that these TPMS structures, for all densities, have the highest isotropy (with a Zener ratio constant with unity) compared with other TPMS structures (such as Schwarz P, Neovious, and diamond). Other woks 28 have compared the mechanical properties of different TPMS structures, which revealed the high specific mechanical properties of gyroid structures. In summary, it can be concluded that sheet-based gyroid TPMSs could be a promising substitutes for EPSs in terms of mechanical properties, manufacturing process, and structural stability, and thus, are the focus of this study.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of mechanical properties and energy absorption capabilities of functionally graded and non-graded thermoplastic sheet gyroid structures

Buil

Higuera

Ranz

et al. 2021

Mechanics of Advanced Materials and Structures

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Comparative analysis of mechanical properties and energy absorption capabilities of functionally graded and non-graded thermoplastic sheet gyroid structuresAdditive manufacturing allows the tailoring of the structure of energyabsorbing materials. It is thus feasible now to use light, printed structures instead of other materials such as foams and honeycombs, signifying greater possibilities for customization. Some of these structures are triply periodic minimal-surface structures that is a family of different structures like the gyroid one. Another benefit of additively manufactured graded structures, which foams or honeycombs lack, is the flexibility to vary the internal parameters along one or more directions. This study focuses on the comparative analysis of graded and non-graded gyroid structures for four common thermoplastic materials used in additive manufacturing.These structures are compared with each other under quasi-static compression testing, as well as with expanded polystyrene foam and solid samples of the thermoplastic materials. The analysis includes investigation of the stress-strain and specific stress-strain curves, capability of absorbing energy per unit weight and per unit volume, ideality, total efficiency, and normalized energy vs. normalized stress characteristics.We also analyze the internal fracture mechanism of the structures. The objective is to obtain more extensive knowledge of the behavior of nongraded structures.

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“…TPMS lattice structures are more similar with natural structures without excessive connection joints due to highly interconnected with high porosities, compared with the most utilized truss lattices. Therefore, TPMS lattice structures have attracted the attention of many scholars due to its excellent physical properties, such as zero-value mean curvature and mathematical definition [18][19][20][21]. And it has been proved that TPMS lattice structures have good mechanical properties compared with conventional lattice structures [22].…”

Section: Introductionmentioning

confidence: 99%

A novel design method for TPMS lattice structures with complex contour based on moving elements method

Zhang

Yu³

et al. 2022

Int J Adv Manuf Technol

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Over the past few decades, there have been many important achievements on the design, research and development of minimal surface lattice structures. In this work, we propose a modeling method for triply periodic minimal surfaces (TPMS) lattice structures with complex contours. This method is based on moving elements method (MEM) and mainly includes the following parts, such as dividing the model mesh, solving the iso-surface of the TPMS in the model, obtaining the TPMS lattice structure triangular surface of the model outline, integrating the interior of the model and the outline, and finally generating an STL file that can be used for additive manufacturing. Furthermore, the representative femur model, rabbit model and gear model are provided as case studies to verify the validity and correctness of the proposed modeling method. Then, this approach is compared with the distance field method in terms of modeling speed and modeling accuracy. The research results show that the modeling method proposed in this paper has certain advantages in the generation of complex model lattice structures. Moreover, this method provides technical means and simulation data for designing TPMS lattice structures with complex contour, and offers the underlying design ideas for the development and application of the excellent physical properties of TPMS lattice structures in medicine and engineering.

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Characterization of additively manufactured triply periodic minimal surface structures under compressive loading

Cited by 35 publications

References 52 publications

Mechanical properties and energy–absorption capabilities of thermoplastic sheet gyroid structures

Mechanical properties and energy–absorption capabilities of thermoplastic sheet gyroid structures

Comparative analysis of mechanical properties and energy absorption capabilities of functionally graded and non-graded thermoplastic sheet gyroid structures

A novel design method for TPMS lattice structures with complex contour based on moving elements method

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