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Svyatoslav Chugunov
Center for Design, Manufacturing and Materials, Skolkovo Institute of Science and Technology, 121205 Moscow, Russia

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Journal article
Published: 23 July 2021 in Applied Sciences
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Complex 3D objects with microstructures can be modelled using the function representation (FRep) approach and then manufactured. The task of modelling a geometric object with a sophisticated microstructure based on unit cell repetition is often too computationally expensive for CAD systems. FRep provides efficient tools to solve this problem. However, even for FRep the slicing step required for manufacturing can take a significant amount of time. An accelerated slicing algorithm for FRep 3D objects is proposed in this paper. This algorithm allows the preparation of FRep models for 3D printing without surface generation stage. The spatial index is employed to accelerate the slicing process. A novel compound adaptive criterion and a novel acceleration criterion are proposed to speed up the evaluation of the defining function of an FRep object. The use of these criteria is significantly reducing the computational time for contour construction during the slicing process. The K-d tree and R-tree data structures are used as spatial indexes. The performance of the accelerated slicing algorithm was tested. The contouring time was reduced 100-fold due to using the novel compound adaptive criterion with the novel acceleration criterion.

ACS Style

Evgenii Maltsev; Dmitry Popov; Svyatoslav Chugunov; Alexander Pasko; Iskander Akhatov. An Accelerated Slicing Algorithm for Frep Models. Applied Sciences 2021, 11, 6767 .

AMA Style

Evgenii Maltsev, Dmitry Popov, Svyatoslav Chugunov, Alexander Pasko, Iskander Akhatov. An Accelerated Slicing Algorithm for Frep Models. Applied Sciences. 2021; 11 (15):6767.

Chicago/Turabian Style

Evgenii Maltsev; Dmitry Popov; Svyatoslav Chugunov; Alexander Pasko; Iskander Akhatov. 2021. "An Accelerated Slicing Algorithm for Frep Models." Applied Sciences 11, no. 15: 6767.

Journal article
Published: 16 February 2021 in Energies
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Water droplets released from the sea surface represent one of the major causes of ice accretion on marine vessels. A one-dimensional model of the freezing of a spherical water droplet moving in cold air was developed. The crystallization model allows one to obtain an analytical solution if a uniform temperature distribution over the liquid’s core is assumed. The model was validated using STAR CCM+ Computational fluid dynamics (CFD) code. A collision of a partially frozen droplet with a solid wall assuming the plastic deformation of an ice crust was also considered. The ratio of the crust deformation to the crust thickness was evaluated. It was assumed that if this ratio were to exceed unity, the droplet would stick to the wall’s surface due to ice bridge formation caused by the water released from the droplet’s core.

ACS Style

Doston Shayunusov; Dmitry Eskin; Boris Balakin; Svyatoslav Chugunov; Stein Johansen; Iskander Akhatov. Modeling Water Droplet Freezing and Collision with a Solid Surface. Energies 2021, 14, 1020 .

AMA Style

Doston Shayunusov, Dmitry Eskin, Boris Balakin, Svyatoslav Chugunov, Stein Johansen, Iskander Akhatov. Modeling Water Droplet Freezing and Collision with a Solid Surface. Energies. 2021; 14 (4):1020.

Chicago/Turabian Style

Doston Shayunusov; Dmitry Eskin; Boris Balakin; Svyatoslav Chugunov; Stein Johansen; Iskander Akhatov. 2021. "Modeling Water Droplet Freezing and Collision with a Solid Surface." Energies 14, no. 4: 1020.

Review article
Published: 08 January 2021 in Acta Astronautica
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This review discusses the development prospects of additive technologies for the manufacturing of complex technological items on the surface of the Moon under scarce resource availability and low-gravity conditions. One of the expected materials for 3D printing as part of a prospective lunar research program is the lunar regolith. It is easily accessible on the Moon in a few forms, depending on geographical location. Due to the limited availability of the lunar regolith on Earth, several attempts to use geological simulants of the regolith were made by research groups worldwide to analyze the applicability of additive manufacturing (AM) technologies for lunar 3D printing. The present review is aimed at discussing recent achievements in the development of chemical and technological aspects of 3D-printing technology for the use of the lunar regolith. A detailed description of all known AM approaches is presented, and the results obtained by various research groups are compared and discussed. All available experiments with 3D printing for in-situ fabrication with lunar regolith were analyzed, systematized, and generalized. Finally, we have formulated the basic requirements and approaches for adapting additive manufacturing methods to lunar surface conditions.

ACS Style

Maxim Isachenkov; Svyatoslav Chugunov; Iskander Akhatov; Igor Shishkovsky. Regolith-based additive manufacturing for sustainable development of lunar infrastructure – An overview. Acta Astronautica 2021, 180, 650 -678.

AMA Style

Maxim Isachenkov, Svyatoslav Chugunov, Iskander Akhatov, Igor Shishkovsky. Regolith-based additive manufacturing for sustainable development of lunar infrastructure – An overview. Acta Astronautica. 2021; 180 ():650-678.

Chicago/Turabian Style

Maxim Isachenkov; Svyatoslav Chugunov; Iskander Akhatov; Igor Shishkovsky. 2021. "Regolith-based additive manufacturing for sustainable development of lunar infrastructure – An overview." Acta Astronautica 180, no. : 650-678.

Journal article
Published: 14 October 2020 in Applied Sciences
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3D printing allows the fabrication of ceramic implants, making a personalized approach to patients’ treatment a reality. In this work, we have tested the applicability of the Function Representation (FRep) method for geometric simulation of implants with complex cellular microstructure. For this study, we have built several parametric 3D models of 4 mm diameter cylindrical bone implant specimens of four different types of cellular structure. The 9.5 mm long implants are designed to fill hole defects in the trabecular bone. Specimens of designed ceramic implants were fabricated at a Ceramaker 900 stereolithographic 3D printer, using a commercial 3D Mix alumina (Al2O3) ceramic paste. Then, a single-axis compression test was performed on fabricated specimens. According to the test results, the maximum load for tested specimens constituted from 93.0 to 817.5 N, depending on the size of the unit cell and the thickness of the ribs. This demonstrates the possibility of fabricating implants for a wide range of loads, making the choice of the right structure for each patient much easier.

ACS Style

Alexander Safonov; Evgenii Maltsev; Svyatoslav Chugunov; Andrey Tikhonov; Stepan Konev; Stanislav Evlashin; Dmitry Popov; Alexander Pasko; Iskander Akhatov. Design and Fabrication of Complex-Shaped Ceramic Bone Implants via 3D Printing Based on Laser Stereolithography. Applied Sciences 2020, 10, 7138 .

AMA Style

Alexander Safonov, Evgenii Maltsev, Svyatoslav Chugunov, Andrey Tikhonov, Stepan Konev, Stanislav Evlashin, Dmitry Popov, Alexander Pasko, Iskander Akhatov. Design and Fabrication of Complex-Shaped Ceramic Bone Implants via 3D Printing Based on Laser Stereolithography. Applied Sciences. 2020; 10 (20):7138.

Chicago/Turabian Style

Alexander Safonov; Evgenii Maltsev; Svyatoslav Chugunov; Andrey Tikhonov; Stepan Konev; Stanislav Evlashin; Dmitry Popov; Alexander Pasko; Iskander Akhatov. 2020. "Design and Fabrication of Complex-Shaped Ceramic Bone Implants via 3D Printing Based on Laser Stereolithography." Applied Sciences 10, no. 20: 7138.

Journal article
Published: 05 September 2020 in Materials
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Evolution of additively manufactured (AM) ceramics’ microstructure between manufacturing stages is a hardly explored topic. These data are of high demand for advanced numerical modeling. In this work, 3D microstructural models of Al2O3 greenbody, brownbody and sintered material are presented and analyzed, for ceramic samples manufactured with SLA-based AM workflow, using a commercially available ceramic paste and 3D printer. The novel data, acquired at the micro- and mesoscale, using Computed Tomography (CT), Scanning Electron Microscopy (SEM) and Focused Ion-Beam SEM (FIB/SEM) techniques, allowed a deep insight into additive ceramics characteristics. We demonstrated the spatial 3D distribution of ceramic particles, an organic binder and pores at every stage of AM workflow. The porosity of greenbody samples (1.6%), brownbody samples (37.3%) and sintered material (4.9%) are analyzed. Pore distribution and possible originating mechanisms are discussed. The location and shape of pores and ceramic particles are indicative of specific physical processes driving the ceramics manufacturing. We will use the presented microstructural 3D models as input and verification data for advanced numerical simulations developed in the project.

ACS Style

Svyatoslav Chugunov; Nikolaus Adams; Iskander Akhatov. Evolution of SLA-Based Al2O3 Microstructure During Additive Manufacturing Process. Materials 2020, 13, 3928 .

AMA Style

Svyatoslav Chugunov, Nikolaus Adams, Iskander Akhatov. Evolution of SLA-Based Al2O3 Microstructure During Additive Manufacturing Process. Materials. 2020; 13 (18):3928.

Chicago/Turabian Style

Svyatoslav Chugunov; Nikolaus Adams; Iskander Akhatov. 2020. "Evolution of SLA-Based Al2O3 Microstructure During Additive Manufacturing Process." Materials 13, no. 18: 3928.

Journal article
Published: 25 November 2019 in Materials
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Low-permeable materials, either artificial or natural, are essential components of the current technological development. Their production or processing requires a comprehensive characterization method based on confident reference standards. Permeability standards for values below 10−15 m2 are lacking. In this study, we explored the feasibility of using the ceramic sintering process to reach low, but measurable values of gas permeability in Al2O3 samples, as one of the potential materials for reference standards. The studied samples were produced with a ceramic 3D printer, which enables the manufacturing of low-permeable samples having complex geometrical arrangements. A series of preliminary laboratory testing indicated the available gas permeability range from 2.4 × 10−15 m2 for the pre-sintered samples to 1.8 × 10−21 m2 for the sintered samples. The verification of the permeability reduction was carried out using a unique unsteady state fast and accurate measurement method. The results confirm the possibility of developing a technology for materials manufacturing with low porosity and permeability. Such materials open many areas for application, including manufacturing of ceramics with controlled transport properties and low-permeability standards for calibrating laboratory equipment for geosciences, construction industries, biomedical, and other relevant fields.

ACS Style

Svyatoslav Chugunov; Andrey Kazak; Mohammed Amro; Carsten Freese; Iskander Akhatov. Towards Creation of Ceramic-Based Low Permeability Reference Standards. Materials 2019, 12, 3886 .

AMA Style

Svyatoslav Chugunov, Andrey Kazak, Mohammed Amro, Carsten Freese, Iskander Akhatov. Towards Creation of Ceramic-Based Low Permeability Reference Standards. Materials. 2019; 12 (23):3886.

Chicago/Turabian Style

Svyatoslav Chugunov; Andrey Kazak; Mohammed Amro; Carsten Freese; Iskander Akhatov. 2019. "Towards Creation of Ceramic-Based Low Permeability Reference Standards." Materials 12, no. 23: 3886.