Design and additive manufacturing of closed cells from supportless lattice structure

Kumar, Ajeet; Collini, Luca; Daurel, Alix; Jeng, Jeng-Ywan

doi:10.1016/j.addma.2020.101168

Cited by 64 publications

(52 citation statements)

References 26 publications

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“…Figure 5 shows the stress–strain curves of the tests for different lattice structure specimens. To evaluate these structures’ mechanical properties and the energy absorption ability of different lattice structures, we obtained these quantities with the following equations [ 27 ]:

where

is the relative density of the lattice structure,

is the density of the lattice structure in g/cm 3 ,

is the density of PEEK (1.29 g/cm 3 ),

is the compressive modulus in MPa,

is the yield stress in MPa obtained at 0.02 of strain (linear part of the stress–strain curve), and

is the energy absorption per unit volume calculated by numerically integrating the stress–strain curves up to the strain of 0.4 due to the absence of stabilized densification ( Figure 5 ) [ 27 ]. The energy absorption per unit volume of different lattice structures offers useful insight for application of these structures in impact and energy absorption applications.…”

Section: Resultsmentioning

confidence: 99%

Compressive Properties of Functionally Graded Bionic Bamboo Lattice Structures Fabricated by FDM

Zhang

2021

Materials

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Bionic design is considered a promising approach to improve the performance of lattice structures. In this work, bamboo-inspired cubic and honeycomb lattice structures with graded strut diameters were designed and manufactured by 3D printing. Uniform lattice structures were also designed and fabricated for comparison. Quasi-static compression tests were conducted on lattice structures, and the effects of the unit cell and structure on the mechanical properties, energy absorption and deformation mode were investigated. Results indicated that the new bionic bamboo structure showed similar mechanical properties and energy absorption capacity to the honeycomb structure but performed better than the cubic structure. Compared with the uniform lattice structures, the functionally graded lattice structures showed better performance in terms of initial peak strength, compressive modulus and energy absorption.

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where

is the relative density of the lattice structure,

is the density of the lattice structure in g/cm 3 ,

is the density of PEEK (1.29 g/cm 3 ),

is the compressive modulus in MPa,

is the yield stress in MPa obtained at 0.02 of strain (linear part of the stress–strain curve), and

Section: Resultsmentioning

confidence: 99%

Compressive Properties of Functionally Graded Bionic Bamboo Lattice Structures Fabricated by FDM

Zhang

2021

Materials

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“…Support removal, powder removal, or resin removal (under the primary post-processing category) are important post-processing steps in additive manufacturing which usually consume considerable time. To address this, Ajeet et al designed and additively manufactured a bio-inspired supportless-lattice structure with the MEX process, which has eliminated the support required during fabrication, resulting in high-speed additive manufacturing with less time in support-removal post-processing [106,107]. In general, post-processing is done after 3D printing to enhance the properties of the part/object [108,109].…”

Section: Post-processing Techniques For 3d-printed Polymersmentioning

confidence: 99%

Post-Processing of 3D-Printed Polymers

et al. 2021

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Additive manufacturing, commonly known as 3D printing, is an advancement over traditional formative manufacturing methods. It can increase efficiency in manufacturing operations highlighting advantages such as rapid prototyping, reduction of waste, reduction of manufacturing time and cost, and increased flexibility in a production setting. The additive manufacturing (AM) process consists of five steps: (1) preparation of 3D models for printing (designing the part/object), (2) conversion to STL file, (3) slicing and setting of 3D printing parameters, (4) actual printing, and (5) finishing/post-processing methods. Very often, the 3D printed part is sufficient by itself without further post-printing processing. However, many applications still require some forms of post-processing, especially those for industrial applications. This review focuses on the importance of different finishing/post-processing methods for 3D-printed polymers. Different 3D printing technologies and materials are considered in presenting the authors’ perspective. The advantages and disadvantages of using these methods are also discussed together with the cost and time in doing the post-processing activities. Lastly, this review also includes discussions on the enhancement of properties such as electrical, mechanical, and chemical, and other characteristics such as geometrical precision, durability, surface properties, and aesthetic value with post-printing processing. Future perspectives is also provided towards the end of this review.

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“…As said, these lattice structures are designed for supportless printing, eliminating the needs for support material within the lattice, that is an undoubted advantage 8 . Hence, also a closed cell lattice structure can be additively manufactured with the design concept of the supportless lattice structure 9 …”

Section: Additive Manufacturing Of Latticesmentioning

confidence: 99%

Design and optimization of 3D fast printed cellular structures

Collini

Ursini

Kumar

2021

Mat Design & Process Comms

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This paper analyzes the effect of thin and thick walls on functional properties of 3D printed cell structures, designed from open cell structures inspired by the natural world. Different types of unit cells with the same density are introduced. The cells are studied in morphology and mechanical performance, in particular effective density, compressive stiffness, and energy absorption under cyclic loading. Material extrusion process with thermoplastic polyurethane filament is used as additive manufacturing technique, without any support structure. The designed printed cellular structures are studied numerically, using an advanced hyperelastic material model with hysteretic capacity, and experimentally by uniaxial compression testing for characterization of stiffness and energy absorption. The benefits and limitations of the method are highlighted.

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Design and additive manufacturing of closed cells from supportless lattice structure

Cited by 64 publications

References 26 publications

Compressive Properties of Functionally Graded Bionic Bamboo Lattice Structures Fabricated by FDM

Compressive Properties of Functionally Graded Bionic Bamboo Lattice Structures Fabricated by FDM

Post-Processing of 3D-Printed Polymers

Design and optimization of 3D fast printed cellular structures

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