Compressive failure modes and energy absorption in additively manufactured double gyroid lattices

Maskery, Ian; Aboulkhair, Nesma T.; Aremu, Adedeji; Tuck, Christopher; Ashcroft, Ian

doi:10.1016/j.addma.2017.04.003

Cited by 273 publications

(190 citation statements)

References 22 publications

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“…The energy absorption capability of progressively failing glassy carbon nanospinodals substantially exceeds that of any other 3D architected material (Figure d). We measure 3–20 times increased specific energy absorption compared to the most advanced nanolattices, as well as larger‐scale beam‐, and shell‐based architected materials . Compared to metal foams, our nanospinodals show up to an order of magnitude increase in energy absorption capability .…”

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confidence: 97%

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Ultrahigh Energy Absorption Multifunctional Spinodal Nanoarchitectures

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Nanolattices are promoted as next‐generation multifunctional high‐performance materials, but their mechanical response is limited to extreme strength yet brittleness, or extreme deformability but low strength and stiffness. Ideal impact protection systems require high‐stress plateaus over long deformation ranges to maximize energy absorption. Here, glassy carbon nanospinodals, i.e., nanoarchitectures with spinodal shell topology, combining ultrahigh energy absorption and exceptional strength and stiffness at low weight are presented. Noncatastrophic deformation up to 80% strain, and energy absorption up to one order of magnitude higher than for other nano‐, micro‐, macro‐architectures and solids, and state‐of‐the‐art impact protection structures are shown. At the same time, the strength and stiffness are on par with the most advanced yet brittle nanolattices, demonstrating true multifunctionality. Finite element simulations show that optimized shell thickness‐to‐curvature‐radius ratios suppress catastrophic failure by impeding propagation of dangerously oriented cracks. In contrast to most micro‐ and nano‐architected materials, spinodal architectures may be easily manufacturable on an industrial scale, and may become the next generation of superior cellular materials for structural applications.

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confidence: 97%

“…c) Energy absorption versus relative density. d) Comparison of the energy absorption with metallic foams, nanolattices, large‐scale beam‐, and shell‐based lattices …”

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confidence: 99%

Ultrahigh Energy Absorption Multifunctional Spinodal Nanoarchitectures

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Crook

et al. 2019

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“…For these three conditions, adding layers upon layers with a defined unit cell size (for example a lattice with intersecting cellular rods) produce desired structure shapes easily, but will be deformed relatively easily during compressive loading. It shows that cell type, size and alignment together play a pivotal role on their failure mechanism [36]. The experimental stress-strain curves from the compression test are shown in Figure 10.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Behavior of Ti6Al4V Scaffolds Filled with CaSiO3 for Implant Applications

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Triply periodic minimal surfaces (TPMS) are becoming increasingly attractive due to their biomedical applications and ease of production using additive manufacturing techniques. In the present paper, the architecture of porous scaffolds was utilized to seek for the optimized cellular structure subjected to compression loading. The deformation and stress distribution of five lightweight scaffolds, namely: Rectangular, primitive, lattice, gyroid and honeycomb Ti6Al4V structures were studied. Comparison of finite element simulations and experimental compressive test results was performed to illustrate the failure mechanism of these scaffolds. The experimental compressive results corroborate reasonably with the finite element analyses. Results of this study can be used for bone implants, biomaterial scaffolds and antibacterial applications, produced from the Ti6Al4V scaffold built by a selective laser melting (SLM) method. In addition, Ti6Al4V manufactured metallic lattice was filled by wollastonite (CaSiO 3 ) through spark plasma sintering (SPS) to illustrate the method for the production of a metallic-ceramic composite suitable for bone tissue engineering.Gradient structures, unit cell size, strut diameter, the volume fraction the of sample, plasticity and damage tolerance, as well as the minimizing of cost/time are considered during the computer-aided design (CAD) and simulation. In order to have optimized lightweight structures under loading and in vivo or in vitro conditions, printed scaffolds can be graded axially or radially [12]. Recently, research is focused upon polymeric printing using polyjet/inkjet deposition [13], which is faster with no post-processing, unlike metal printing. However, the low mechanical properties of polymer 3D printed materials make it non-applicable for in vivo conditions. Porous Ti6Al4V structures have yield strength and compressive strength in the range of 90-220 MPa [14]. The computer-aided design (CAD) of porous scaffolds and finite element analysis (FEA) have recently attracted much attention in the tissue engineering field. Fluid permeability [15] and biocompatibility [16] of scaffolds depends directly on the pore geometry and topology [17] of structures. The curved shape, smoothness, good flowability, 3D manufacturability and biocompatibility of Ti6Al4V powder particles makes Ti-based alloy promising for load bearing bone implants [18]. It is well known that the artificial bone scaffolds should have the following characteristics: (1) Biocompatibility with living tissues; (2) mechanical properties for trabecular bone and cortical bone (ranging from 0.7 to 15 MPa till >100 MPa [19]); and (3) porous fabricated structures for osteoporosis diseases. Periodic porous materials like TPMS are potential candidates for biomimetic scaffold architecture [19]. The main advantage of TPMS scaffolds is the open interconnected cell structure, deemed to facilitate cell migration, vitalization and vascularization, while retaining a high degree of structural stiffness [20]. Henceforth, mechanical ...

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“…Si10-Mg, and indicated that the gyroid structures were suitable for energy absorbing applications [4]. In terms of biocompatibility, TPMS can provide large surface area for cell adhesion due to the high surface to volume ratio.…”

Section: Maskery Et Al Investigated the Failure Modes In Double Gyromentioning

confidence: 99%

“…Porous structures such as honeycomb [1], crystalline lattices [2], Voronoi foam [3], and gyroid lattices [4], all of which are manufactured using selective laser melting (SLM), have significant advantages: they are lightweight, they can reduce the consumption of materials, and they allow for mechanical property adjustment. These structures are widely used in aerospace engineering [5], product repair, tissue engineering [6], and as filling structures in addition to saving processing time and reducing powder consumption.…”

Section: Introductionmentioning

confidence: 99%