Optimization of energy absorption performance of polymer honeycombs by density gradation

Rahman, Oyindamola; Koohbor, Behrad

doi:10.1016/j.jcomc.2020.100052

Cited by 30 publications

(29 citation statements)

References 53 publications

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“…Under this pretext, in recent years, in the area of additive manufacturing, both companies and researchers have approached the field of products with elastic properties, increasing the research based on flexible geometric structures and solid models with a common objective of improving the functionality of these structures based on the properties of the material and the geometry [ 9 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

“…A growing trend has been detected in the creating of products with deformable properties and the studying of structures that can vary the properties of the material to generate products with a certain elasticity [ 15 , 30 , 31 , 32 , 33 ]. An example of this research is the parametric study through experimentation and finite element of several designs of lattice structures carried out by Fei Shen et al [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

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Influence of 3D-Printed TPU Properties for the Design of Elastic Products

2021

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The design of products with elastic properties is a paradigm for design engineers because the properties of the material define the correct functionality of the product. Fused filament fabrication (FFF) allows for the printing of products in thermoplastic polyurethanes (TPU). Therefore, it offers the ability to design elastic products with the freedom of forms that this technology allows and also with greater variation of elastic properties than with a conventional process. The internal structures and the variation in thickness that can be used facilitate the design of products with different elastic realities, producing variations in the elasticity of the product with the same material. This work studies the influence of the variation of internal density as a function of basic geometries in order to quantify the difference in elasticity produced on a product when it is designed. Likewise, a case study was carried out with the creation of a fully elastic computer keyboard printed in 3D. The specimens were subjected to compression to characterize the behavior of the structures. The tests showed that the elasticity varies depending on the orientation and geometry, with the highest compressive strength observed in the vertical orientation with 80% lightening. In addition, the internal lightening increases the elasticity progressively but not uniformly with respect to the solid geometry, and also the flat faces favour the reduction in elasticity. This study classifies the behavior of TPU with the aim of being applied to the design and manufacture of products with specific properties. In this work, a totally flexible and functional keyboard was designed, obtaining elasticity values that validate the study carried out.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of 3D-Printed TPU Properties for the Design of Elastic Products

2021

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“…The versatility and control over the manufacturing process offered by AM has made available a wide range of possibilities in the manufacture of lattice geometries and structures with more complex architectures [34][35][36][37]. This factor has led to a growing trend in the use of lattice structures, also due to the excellent energy absorption and impact properties that they can offer [30,[38][39][40][41]. In addition this structures also demonstrated their potential for various applications from different industrial sectors [21,38], especially the possibility of adapting and optimizing materials for innovative lightweight and high-performance configurations [7,20].…”

Section: Introductionmentioning

confidence: 99%

“…This factor has led to a growing trend in the use of lattice structures, also due to the excellent energy absorption and impact properties that they can offer [30,[38][39][40][41]. In addition this structures also demonstrated their potential for various applications from different industrial sectors [21,38], especially the possibility of adapting and optimizing materials for innovative lightweight and high-performance configurations [7,20].…”

Section: Introductionmentioning

confidence: 99%

Design of Customized TPU Lattice Structures for Additive Manufacturing: Influence on the Functional Properties in Elastic Products

et al. 2021

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This work focuses on evaluating and establishing the relationship of the influence of geometrical and manufacturing parameters in stiffness of additively manufactured TPU lattice structures. The contribution of this work resides in the creation of a methodology that focuses on characterizing the behavior of elastic lattice structures. Likewise, resides in the possibility of using the statistical treatment of results as a guide to find favorable possibilities within the range of parameters studied and to predict the behavior of the structures. In order to characterize their behavior, different types of specimens were designed and tested by finite element simulation of a compression process using Computer Aided Engineering (CAE) tools. The tests showed that the stiffness depends on the topology of the cells of the lattice structure. For structures with different cell topologies, it has been possible to obtain an increase in the reaction force against compression from 24.7 N to 397 N for the same manufacturing conditions. It was shown that other parameters with a defined influence on the stiffness of the structure were the temperature and the unit size of the cells, all due to the development of fusion mechanisms and the variation in the volume of material used, respectively.

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“…Rapaka et al [2] studied the dynamic compressive behaviors of hexagonal honeycombs under shocks. Rahman and Koohbor [3] studied the energy absorption performances of density gradient honeycombs. Zhang et al [4,5] investigated the dynamic crushing responses of honeycombs with negative Poisson's ratio.…”

Section: Introductionmentioning

confidence: 99%

Vibration and Flutter of a Honeycomb Sandwich Plate with Zero Poisson’s Ratio

2021

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A honeycomb is a kind of excellent lightweight structure and a honeycomb sandwich plate with zero Poisson’s ratio (ZPR) core is used widely in morphing structures. In this paper, a sandwich plate composed of a honeycomb core with zero Poisson’s ratio is analyzed for free vibrations and flutter under supersonic airflows. The equivalent elastic parametric formulas of the honeycomb core for zero Poisson’s ratio are proposed. The models are compared for their natural frequencies by theoretical and finite element methods respectively, which verifies the validity of the equivalent elastic parametric formulas and the model for the honeycomb sandwich plate with zero Poisson’s ratio. The influence of the geometric parameters of the honeycomb plate on the vibration frequencies is obtained. Three kinds of honeycomb cores, namely, regular hexagon, auxetic and hybrid with zero Poisson’s ratio, are compared through natural frequencies of the sandwich plate. It is found that the frequency of the zero Poisson’s ratio honeycomb sandwich plate is the second one when the other parameters are the same. The flutter of the honeycomb plate is analyzed by using the first order piston theory under supersonic flows. The critical flutter velocity of the plate is obtained, and the influence of geometric parameters of the honeycomb plate on the critical flutter velocities is obtained.

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Optimization of energy absorption performance of polymer honeycombs by density gradation

Cited by 30 publications

References 53 publications

Influence of 3D-Printed TPU Properties for the Design of Elastic Products

Influence of 3D-Printed TPU Properties for the Design of Elastic Products

Design of Customized TPU Lattice Structures for Additive Manufacturing: Influence on the Functional Properties in Elastic Products

Vibration and Flutter of a Honeycomb Sandwich Plate with Zero Poisson’s Ratio

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