Mechanical metamaterials with topologies based on curved elements: An overview of design, additive manufacturing and mechanical properties

Álvarez-Trejo, Alberto; Cuan-Urquizo, Enrique; Bhate, Dhruv; Román-Flores, Armando

doi:10.1016/j.matdes.2023.112190

Cited by 13 publications

(8 citation statements)

References 188 publications

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“…where X = 2πx∕λ, Y = 2πy∕λ, and Z = 2πz∕λ. λ is the unit cell dimension and x, y and z are the number of unit cells in related directions [27]. Due to the thin wall manufacturing limitation of LPBF process [30], unit cell size and volume fractions were selected such that the thinnest features have 0.5 mm wall thickness.…”

Section: Specimen Geometry and Design Of Experiments Preparationmentioning

confidence: 99%

“…It is observed in the literature that most of the studies focused on compressive properties of TPMS lattices, little attention was given to dimensional deviation prediction [27,28]. To address this issue, in the present study, dimensional deviation of five different TPMS lattices produced by LPBF method was predicted by using thermomechanical modelling.…”

Section: Introductionmentioning

confidence: 97%

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The effect of geometrical parameters on dimensional deviation in LPBF produced TPMS lattices: a numerical simulation based study

Gülcan,

Günaydın,

Tamer

2024

Modelling Simul. Mater. Sci. Eng.

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Triply periodic minimal surface (TPMS) lattices have drawn significant attention both from academic and industrial perspectives due to their favourable mechanical behaviours. Additive manufacturing (AM) modalities enable easy production of these lattices. However, dimensional inaccuracy is still a problem faced by AM. The manufacturing of these lattices with AM modalities, then measuring the critical dimensions and making design changes accordingly is a costly process. Therefore, it is necessary to predict the dimensional deviation of TPMS lattices before print is a key topic. This study focused on prediction of dimensional deviation of laser powder bed fusion (LPBF) produced Gyroid, Diamond, Primitive, IWP and Fisher-Koch lattices by using thermomechanical simulations. TPMS type, unit cell size, volume fraction, functional grading and part orientation were selected as design variables. Results showed that all the design inputs have effects on dimensional accuracy of LPBF produced parts and TPMS type has the most critical factor. Based on analysis of variance (ANOVA) analysis, an optimum lattice configuration was proposed to obtain the lowest dimensional deviation after LPBF build.

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Section: Specimen Geometry and Design Of Experiments Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

The effect of geometrical parameters on dimensional deviation in LPBF produced TPMS lattices: a numerical simulation based study

Gülcan,

Günaydın,

Tamer

2024

Modelling Simul. Mater. Sci. Eng.

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“…Curve‐based topologies have various advantages regarding effective mechanical properties, such as larger compliance, a reduced stress concentration, and an increased EA capacity. [ 31 ] In 2014, researchers found that structures composed of sinusoidal ligaments can also exhibit auxetic behavior by adjusting the phase. [ 32,33 ] Then, Wormuth et al [ 34 ] prepared 3D metallic sinusoidal structures using selective electron beam melting for the first time and investigated the effect of ligament thickness and amplitude on the structures’ mechanical properties and deformation behavior.…”

Section: Introductionmentioning

confidence: 99%

Node‐Reinforced Design and Selective Remanufacturing of Auxetic Lattice Structures

Zhang,

Xu,

et al. 2024

Adv Eng Mater

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Auxetic structures have many potential applications due to their counter‐intuitive deformation behavior and desirable mechanical properties. However, auxetic structures have some drawbacks, such as bending or rotational deformation of ligaments, leading to relatively low energy absorption performance and stability. In this paper, we propose designing nodal reinforcement of the sinusoidal lattice, and silicone rubber is selectively 3D printed inside the structure. As a result, under quasi‐static loading, the nodes of the structure improve the energy absorption performance by 214%; compared to resin reinforcement, silicone rubber gradient reinforcement not only continues to provide load‐bearing capacity to the structure but also improves energy absorption by a significant 112%. The assignment of silicone rubber nodes was found to effectively prevent the lateral slip of the structure after ligament rupture, resulting in a more stable and controllable deformation of the sinusoidally auxetic structure. Under low‐velocity dynamic loading, silicone rubber’s designed nodes improve the structure’s deformation stability more significantly and enhance the energy absorption performance, which increases with the strain rate. The design and fabrication techniques have the potential for the integrated fabrication of multi‐material lightweight structures with complex shapes, superior mechanical properties, and multifunctional attributes.This article is protected by copyright. All rights reserved.

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“…Mechanical metamaterials, as a crucial subfield of metamaterials, aim to achieve extraordinary mechanical properties that conventional materials cannot provide [1]. These properties often include unique zero or negative mechanical parameters, such as Poisson's ratio and elastic modulus [2].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, flexible TPMS lattice structures have emerged as a recent and growing research area [11]. In contrast to the advantages of rigid lattice structures in load-bearing supports, flexible TPMS lattice structures offer higher elasticity and recoverable large deformations, making them particularly relevant in applications such as seat cushions and helmet impact-absorbing layers [1,12,13]. Last, in the engineering applications of lattice structures, optimization is needed to tailor these structures to complex operating conditions based on functional requirements.…”

Section: Introductionmentioning

confidence: 99%

3D Printing of Flexible Mechanical Metamaterials: Synergistic Design of Process and Geometric Parameters

Li,

Xue,

Chen

et al. 2023

Polymers

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Mechanical metamaterials with ultralight and ultrastrong mechanical properties are extensively employed in various industrial sectors, with three-periodic minimal surface (TPMS) structures gaining significant research attention due to their symmetry, equation-driven characteristics, and exceptional mechanical properties. Compared to traditional lattice structures, TPMS structures exhibit superior mechanical performance. The mechanical properties of TPMS structures depend on the base material, structural porosity (volume fraction), and wall thickness. Hard rigid lattice structures such as Gyroid, diamond, and primitive exhibit outstanding performance in terms of elastic modulus, energy absorption, heat dissipation, and heat transfer. Flexible TPMS lattice structures, on the other hand, offer higher elasticity and recoverable large deformations, drawing attention for use in applications such as seat cushions and helmet impact-absorbing layers. Conventional fabrication methods often fail to guarantee the quality of TPMS structure samples, and additive manufacturing technology provides a new avenue. Selective laser sintering (SLS) has successfully been used to process various materials. However, due to the layer-by-layer manufacturing process, it cannot eliminate the anisotropy caused by interlayer bonding, which impacts the mechanical properties of 3D-printed parts. This paper introduces a process data-driven optimization design approach for TPMS structure geometry by adjusting volume fraction gradients to overcome the elastic anisotropy of 3D-printed isotropic lattice structures. Experimental validation and analysis are conducted using TPMS structures fabricated using TPU material via SLS. Furthermore, the advantages of volume fraction gradient-designed TPMS structures in functions such as energy absorption and heat dissipation are explored.

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Mechanical metamaterials with topologies based on curved elements: An overview of design, additive manufacturing and mechanical properties

Cited by 13 publications

References 188 publications

The effect of geometrical parameters on dimensional deviation in LPBF produced TPMS lattices: a numerical simulation based study

The effect of geometrical parameters on dimensional deviation in LPBF produced TPMS lattices: a numerical simulation based study

Node‐Reinforced Design and Selective Remanufacturing of Auxetic Lattice Structures

3D Printing of Flexible Mechanical Metamaterials: Synergistic Design of Process and Geometric Parameters

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