Design, fabrication, and properties evaluation of novel nested lattice structures

Bhat, Chinmai; Kumar, Ajeet; Lin, Shang-Chih; Jeng, Jeng-Ywan

doi:10.1016/j.addma.2023.103510

Cited by 18 publications

(3 citation statements)

References 35 publications

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“…In addition, the concept of functionally graded lattice structures was investigated, in which the direction of the gradient affected deformation behavior, mechanical properties and energy absorption. Finite element simulations confirmed the findings, and the parametric design approach demonstrated effectiveness in lightweight applications (Bhat et al, 2023). However, to improve large-scale surface lattice structures in AM, nested lattice structures were designed and evaluated.…”

Section: Tpms Cellmentioning

confidence: 59%

“…The structures created by nesting the lattices in the unit cells of the sea urchin show improved load-bearing properties and stability. The findings have implications for the latticing of large additively manufactured components (Bhat et al , 2023). These discoveries contribute to the development of cellular structures, offering practical solutions, improved mechanical properties and multifunctionality in various industries.…”

Section: Introductionmentioning

confidence: 99%

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Determination of cell size/structures and mechanical properties of additively manufactured metallic components using X-ray technique

Moj

Owsiński

Robak

et al. 2023

RPJ

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Purpose Additive manufacturing (AM), a rapidly evolving paradigm, has shown significant advantages over traditional subtractive processing routines by allowing for the custom creation of structural components with enhanced performance. Numerous studies have shown that the technical qualities of AM components are profoundly affected by the discovery of novel metastable substructures in diverse alloys. Therefore, the purpose of this study is to determine the effect of cell structure parameters on its mechanical response. Design/methodology/approach Initially, a methodology was suggested for testing porous materials, focusing on static tensile testing. For a qualitative evaluation of the cellular structures produced, computed tomography (CT) was used. Then, the CT scanner was used to analyze a sample and determine its actual relative density, as well as perform a detailed geometric analysis. Findings The experimental research demonstrates that the mechanical properties of a cell’s structure are significantly influenced by its shape during formation. It was also determined that using selective laser melting to produce cell structures with a minimum single-cell size of approximately 2 mm would be the most appropriate method. Research limitations/implications Further studies of cellular structures for testing their static tensile strength are planned for the future. The study will be carried out for a larger number of samples, taking into account a wider range of cellular structure parameters. An important step will also be the verification of the results of the static tensile test using numerical analysis for the model obtained by CT scanning. Originality/value The fabrication of metallic parts with different cellular structures is very important with a selective laser melted machine. However, the determination of cell size and structure with mechanical properties is quiet novel in this current investigation.

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Section: Tpms Cellmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Determination of cell size/structures and mechanical properties of additively manufactured metallic components using X-ray technique

Moj

Owsiński

Robak

et al. 2023

RPJ

View full text Add to dashboard Cite

show abstract

“…Table 3 presents the averages of two trials for these compressive properties. The energy absorbed (EA) by the lattice was found by calculating the area under the SS curve from initial compression strain 0 to the strain at which the densification region starts (« pe ) denoted by equation ( 6) (Avalle et al, 2001;Bhat et al, 2023). « pe was identified by plotting the energy absorption efficiency (EAE) curve with the strain as abscissas (S. Maiti, Gibson et al, 1984).…”

Section: Compressive Properties Of Latticesmentioning

confidence: 99%

Quasi-static compression and energy absorption behaviour of polymeric selective laser sintered open cell lattices under varying relative densities

2024

RPJ

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Purpose The purpose of this paper is to compare the influence of relative density (RD) and strain rates on failure mechanism and specific energy absorption (SEA) of polyamide lattices ranging from bending to stretch-dominated structures using selective laser sintering (SLS). Design/methodology/approach Three bending and two stretch-dominated unit cells were selected based on the Maxwell stability criterion. Lattices were designed with three RD and fabricated by SLS technique using PA12 material. Quasi-static compression tests with three strain rates were carried out using Taguchi's L9 experiments. The lattice compressive behaviour was verified with the Gibson–Ashby analytical model. Findings It has been observed that RD and strain rates played a vital role in lattice compressive properties by controlling failure mechanisms, resulting in distinct post-yielding responses as fluctuating and stable hardening in the plateau region. Analysis of variance (ANOVA) displayed the significant impact of RD and emphasised dissimilar influences of strain rate that vary to cell topology. Bending-dominated lattices showed better compressive properties than stretch-dominated lattices. The interesting observation is that stretch-dominated lattices with over-stiff topology exhibited less compressive properties contrary to the Maxwell stability criterion, whereas strain rate has less influence on the SEA of face-centered and body-centered cubic unit cells with vertical and horizontal struts (FBCCXYZ). Practical implications This comparative study is expected to provide new prospects for designing end-user parts that undergo various impact conditions like automotive bumpers and evolving techniques like hybrid and functionally graded lattices. Originality/value To the best of the authors' knowledge, this is the first work that relates the strain rate with compressive properties and also highlights the lattice behaviour transformation from ductile to brittle while the increase of RD and strain rate analytically using the Gibson–Ashby analytical model.

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Mechanical Response of Gradient Lattice Structures Based on Topology Optimization

Cheng,

Zhao,

Mao

et al. 2024

Adv Eng Mater

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Lattice structure has the characteristics of lightweight, crashworthy, and better energy absorption capabilities. With the advancement of additive manufacturing (AM) technologies, preparing complex lattice structures has become possible. In this study, some novel lattice structures are designed by topology optimization (TO) based on the inspiration of the triply periodic minimum surface (TPMS) lattice structures. The different volume fraction lattice structures are combined into four gradient lattice structures (GLSs): unidirectional GLS (UNGLS), bidirectional increasing GLS (BIGLS), bidirectional decreasing GLS (BDGLS), and none GLS (NOGLS). Subsequently, selective laser melting (SLM) is employed to manufacture the designed lattice structures. Experiments and finite element (FE) simulation analysis are utilized to evaluate the mechanical performance and collapse patterns of lattice structures. The results show that NOGLS has a higher modulus of elasticity and greater load‐bearing capacity for the same relative density. Furthermore, the energy‐absorbing properties of the dot‐matrix structure are significantly improved by a rational density design strategy. This work is valuable for improving the energy absorption performance of structures.This article is protected by copyright. All rights reserved.

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Design, fabrication, and properties evaluation of novel nested lattice structures

Cited by 18 publications

References 35 publications

Determination of cell size/structures and mechanical properties of additively manufactured metallic components using X-ray technique

Determination of cell size/structures and mechanical properties of additively manufactured metallic components using X-ray technique

Quasi-static compression and energy absorption behaviour of polymeric selective laser sintered open cell lattices under varying relative densities

Mechanical Response of Gradient Lattice Structures Based on Topology Optimization

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