A novel strategy to design lattice structures with zero Poisson’s ratio

Sahariah, Bikram Jyoti; Baishya, Manash Jyoti; Namdeo, Akshay; Khanikar, Prasenjit

doi:10.1016/j.engstruct.2023.116214

Cited by 18 publications

(1 citation statement)

References 47 publications

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“…Another goal was to adjust the mechanical properties, achieved by incorporating reinforcing meshes into a lattice structure with a negative Poisson’s ratio. This composite-inspired approach resulted in better mechanical properties compared to existing structures with zero Poisson’s ratio (Sahariah et al , 2023). 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.…”

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

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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: 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

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A Novel Three‐Dimensional Star Structure with Stable Negative Poisson's Ratio

Wang,

He,

Huang

et al. 2024

Physica Status Solidi (b)

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The concave star structure is a typical negative Poisson's ratio structure which reduces the volume of the structure through mechanical compression. Usually, the parameters of the structure such as wall thickness, bevel angle, and size affect the strength, stiffness, and energy absorption characteristics of the structure. This study designs a novel 3D star‐shaped structure with a negative Poisson's ratio. Through finite element method simulation and mechanical experiments, the influence of relevant parameters on the strength, stiffness, and Poisson's ratio of the overall structure is explored, and the deformation mode, load‐bearing capacity, and energy absorption capacity of the structure under quasistatic compression conditions are systematically studied, and structural parameters with good mechanical properties are finally obtained. The unit cell of the proposed structure has higher strength and specific energy absorption, and the proposed star‐shaped structure shows a stable negative Poisson's ratio phenomenon after array combination compared with the traditional star‐shaped structure. The structure designed in this research has both high strength and stiffness, as well as good buffering and high energy‐absorbing potential, to prevent structural fracture under limited compression distance, which may have broad application prospects in the field of protective structures.

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