A Survey of Modeling of Lattice Structures Fabricated by Additive Manufacturing

Dong, Guoying; Tang, Yunlong; Zhao, Yaoyao Fiona

doi:10.1115/1.4037305

Cited by 232 publications

(141 citation statements)

References 122 publications

(157 reference statements)

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“…The most notable trend emerging from the review of the most recent state-of-the-art is the increasing and pervasive employment of additive manufacturing solutions for the engineeringoriented application of the large amount of theoretical knowledge about auxetic materials based on tailorable microstructures [35], [36], [37], [38]. Indeed, additive manufacturing is rapidly evolving as one of the most promising manufacturing technologies for designing, optimizing, rapid prototyping and large scale producing three-dimensional architected cellular materials with high-fidelity realization of complex microstructural topologies [39], [40], [41], [42], [43], [44]. Interesting advanced applications for additive manufactured architected materials range across many modern fields in frontier engineering, from micro-electro-mechanical systems to lightweight components for automotive or aerospace industry, from patient-specific medical implants to smart structural elements in parametric engineering and architecture.…”

Section: Introductionmentioning

confidence: 99%

A novel layered topology of auxetic materials based on the tetrachiral honeycomb microstructure

et al. 2019

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Microstructured honeycomb materials may exhibit exotic, extreme and tailorable mechanical properties, suited for innovative technological applications in a variety of modern engineering fields. The paper is focused on analysing the directional auxeticity of tetrachiral materials, through analytical, numerical and experimental methods. Theoretical predictions about the global elastic properties have been successfully validated by performing tensile laboratory tests on tetrachiral samples, realized with high precision 3D printing technologies. Inspired by the kinematic behaviour of the tetrachiral material, a newly-design bi-layered topology, referred to as bi-tetrachiral material, has been theoretically conceived and mechanically modelled. The novel topology virtuously exploits the mutual collaboration between two tetrachiral layers with opposite chiralities. The bi-tetrachiral material has been verified to outperform the tetrachiral material in terms of global Young modulus and, as major achievement, to exhibit a remarkable auxetic behaviour. Specifically, experimental results, confirmed by parametric analytical and computational analyses, have highlighted the effective possibility to attain strongly negative Poisson ratios, identified as a peculiar global elastic property of the novel bi-layered topology.

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Section: Introductionmentioning

confidence: 99%

A novel layered topology of auxetic materials based on the tetrachiral honeycomb microstructure

et al. 2019

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“…One of the major benefits brought about by additive manufacturing is the ability to produce complex parts, and this is especially true for lattice structures which are regularly spaced and repeating combinations of struts with spaces between them. Lattice structures produced by AM have been the topic of many studies in recent years due to the potential to use these in bone replacement implants [6]- [8]. In implants, the porous nature of the lattice structure is beneficial to lower the elastic modulus of biocompatible materials to match that of the bone at the implant interface, minimizing the possibility for stress shielding causing loss in bone density in the vicinity.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and In-Situ Deformation Imaging of Micro-Lattices Manufactured by Laser Based Powder Bed Fusion

Plessis¹,

Kouprianoff²,

Yadroitsava³

et al. 2018

Preprint

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This paper reports on the production and mechanical properties of Ti6Al4V micro-lattice structures, with strut thickness nearing the single-track width of the laser-based powder bed fusion (LPBF) system used. Besides providing new information on the mechanical properties and manufacturability of such thin-strut lattices, this paper also reports on the in-situ deformation imaging of micro-lattice structures with 6 unit cells in every direction. LPBF lattices are of interest for medical implants, due to the possibility of creating structures with an elastic modulus close to that of the bones and small pore sizes which allow effective osseointegration. In this work four different cubes were produced by laser powder bed fusion and subsequently analyzed using microCT, compression testing and one selected lattice was subjected to in-situ microCT imaging during compression. The in-situ imaging was performed at 4 steps during yielding. The results indicate that mechanical performance (elastic modulus and strength) correlate well with actual density and that this performance is remarkably good, despite the high roughness and irregularity of the struts at this scale. In-situ yielding is visually illustrated.

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“…Continued development of design maps for individual unit cells will help increase understanding of their manufacturability. Additionally, incorporating defects into existing lattice structure models will be useful for quantifying the influence of defects on the desired function of the lattice [133]. From a metrology perspective, process monitoring methods will aid in increasing understanding of defect formation, particularly regarding the influence of process parameters.…”

Section: How Can Defect Formation Be Minimised?mentioning

confidence: 99%

Review of defects in lattice structures manufactured by powder bed fusion

Echeta

Feng

Dutton

et al. 2019

Int J Adv Manuf Technol

149

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Additively manufactured lattice structures are popular due to their desirable properties, such as high specific stiffness and high surface area, and are being explored for several applications including aerospace components, heat exchangers and biomedical implants. The complexity of lattices challenges the fabrication limits of additive manufacturing processes and thus, lattices are particularly prone to manufacturing defects. This paper presents a review of defects in lattice structures produced by powder bed fusion processes. The review focuses on the effects of lattice design on dimensional inaccuracies, surface texture and porosity. The design constraints on lattice structures are also reviewed, as these can help to discourage defect formation. Appropriate process parameters, post-processing techniques and measurement methods are also discussed. The information presented in this paper contributes towards a deeper understanding of defects in lattice structures, aiming to improve the quality and performance of future designs.

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A Survey of Modeling of Lattice Structures Fabricated by Additive Manufacturing

Cited by 232 publications

References 122 publications

A novel layered topology of auxetic materials based on the tetrachiral honeycomb microstructure

A novel layered topology of auxetic materials based on the tetrachiral honeycomb microstructure

Mechanical Properties and In-Situ Deformation Imaging of Micro-Lattices Manufactured by Laser Based Powder Bed Fusion

Review of defects in lattice structures manufactured by powder bed fusion

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