Deformation of honeycomb cellular structures manufactured with Laser Engineered Net Shaping (LENS) technology under quasi-static loading: Experimental testing and simulation

Baranowski, Paweł; Płatek, Paweł; Antolak‐Dudka, Anna; Sarzyński, Marcin; Kucewicz, Michał; Durejko, T.; Małachowski, Jerzy; Janiszewski, Jacek; Czujko, Tomasz

doi:10.1016/j.addma.2018.11.018

Cited by 54 publications

(46 citation statements)

References 56 publications

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“…Computed tomography analysis demonstrated the occurrence of the structural imperfections in laser-melted specimens, such as porosity, voids and interconnectivity also observed in the authors' previous studies [25,46] and by other research groups [39,42,47,48]. The observed voids and pores were insignificant and located in various regions over the lattice, as it could be observed in Figure 7.…”

Section: Analysis Based On Computed Tomographysupporting

confidence: 76%

Investigations on the Mechanical Response of Gradient Lattice Structures Manufactured via SLM

Sienkiewicz

Płatek

Jiang

et al. 2020

Metals

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The main aim of the paper is to evaluate the mechanical behavior or lattice specimens subjected to quasi-static and dynamic compression tests. Both regular and three different variants of SS 316L lattice structures with gradually changed topologies (discrete, increase and decrease) have been successfully designed and additively manufactured with the use of the selective laser melting technique. The fabricated structures were subjected to geometrical quality control, microstructure analysis, phase characterization and compression tests under quasi-static and dynamic loading conditions. The mismatch between dimensions in the designed and produced lattices was noticed. It generally results from the adopted technique of the manufacturing process. The microstructure and phase composition were in good agreement with typical ones after the additive manufacturing of stainless steel. Moreover, the relationship between the structure relative density and its energy absorption capacity has been defined. The value of the maximum deformation energy depends on the adopted gradient topology and reaches the highest value for a gradually decreased topology, which also indicates the highest relative density. However, the highest rate of densification was observed for a gradually increasing topology. In addition, the results show that the gradient topology of the lattice structure affects the global deformation under the loading. Both, static and dynamic loading resulted in both barrel- and waisted-shaped deformation for lattices with an increasing and a decreasing gradient, respectively. Lattice specimens with a gradually changed topology indicate specific mechanical properties, which make them attractive in terms of energy absorption applications.

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Section: Analysis Based On Computed Tomographysupporting

confidence: 76%

Investigations on the Mechanical Response of Gradient Lattice Structures Manufactured via SLM

Sienkiewicz

Płatek

Jiang

et al. 2020

Metals

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“…Computer simulations were conducted with the commercial Ls-Dyna hydrocode with Multi Parallel Processing (MPP) (Livermore Software Technology, Livermore, CA, USA) [48]. The main assumptions made during computer simulations were similar to those presented by the authors in [42,49,50]. The FE models required to run the simulation of the particular structural behaviour under the compression tests have been developed from the CAD models ( Figure 20).…”

Section: Numerical Investigations Of Mechanical Properties Of Structumentioning

confidence: 99%

Deformation Process of 3D Printed Structures Made from Flexible Material with Different Values of Relative Density

et al. 2020

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The main aim of this article is the analysis of the deformation process of regular cell structures under quasi-static load conditions. The methodology used in the presented investigations included a manufacturability study, strength tests of the base material as well as experimental and numerical compression tests of developed regular cellular structures. A regular honeycomb and four variants with gradually changing topologies of different relative density values have been successfully designed and produced in the TPU-Polyflex flexible thermoplastic polyurethane material using the Fused Filament Fabrication (FFF) 3D printing technique. Based on the results of performed technological studies, the most productive and accurate 3D printing parameters for the thermoplastic polyurethane filament were defined. It has been found that the 3D printed Polyflex material is characterised by a very high flexibility (elongation up to 380%) and a non-linear stress-strain relationship. A detailed analysis of the compression process of the structure specimens revealed that buckling and bending were the main mechanisms responsible for the deformation of developed structures. The Finite Element (FE) method and Ls Dyna software were used to conduct computer simulations reflecting the mechanical response of the structural specimens subjected to a quasi-static compression load. The hyperelastic properties of the TPU material were described with the Simplified Rubber Material (SRM) constitutive model. The proposed FE models, as well as assumed initial boundary conditions, were successfully validated. The results obtained from computer simulations agreed well with the data from the experimental compression tests. A linear relationship was found between the relative density and the maximum strain energy value.

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“…The minimum feature achieved by PDED/DLMD is 0.5 mm ( Figure 5 a) [ 139 ]. Figure 5 b shows an example of LENS 3D-printed cellular honeycomb structures with a wall thickness of 0.7 mm [ 140 ]. The micro-PDED/DLMD process (μ-PDED/DLMD) has achieved minimum feature size of 0.5 mm [ 141 , 142 , 143 , 144 ].…”

Section: Powder-based 3d-printing Modalities and Their Resolutionmentioning

confidence: 99%

“…Reproduced with permission from [ 139 ]; ( b ) laser engineered net shaping (LENS) 3D-printed cellular honeycomb structures. Reproduced with permission from [ 140 ]; ( c ) NiTi single tracks printed by PDED 3D-printing process. Reproduced with permission from [ 144 ].…”

Section: Figurementioning

confidence: 99%

Powder-Based 3D Printing for the Fabrication of Device with Micro and Mesoscale Features

et al. 2020

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Customized manufacturing of a miniaturized device with micro and mesoscale features is a key requirement of mechanical, electrical, electronic and medical devices. Powder-based 3D-printing processes offer a strong candidate for micromanufacturing due to the wide range of materials, fast production and high accuracy. This study presents a comprehensive review of the powder-based three-dimensional (3D)-printing processes and how these processes impact the creation of devices with micro and mesoscale features. This review also focuses on applications of devices with micro and mesoscale size features that are created by powder-based 3D-printing technology.

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Deformation of honeycomb cellular structures manufactured with Laser Engineered Net Shaping (LENS) technology under quasi-static loading: Experimental testing and simulation

Cited by 54 publications

References 56 publications

Investigations on the Mechanical Response of Gradient Lattice Structures Manufactured via SLM

Investigations on the Mechanical Response of Gradient Lattice Structures Manufactured via SLM

Deformation Process of 3D Printed Structures Made from Flexible Material with Different Values of Relative Density

Powder-Based 3D Printing for the Fabrication of Device with Micro and Mesoscale Features

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