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Mr. Stepan Konev
Skolkovo Institute of Science and Technology

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Research Keywords & Expertise

0 Additive Manufacturing
0 Mechanical Testing Of Materials
0 Metrology
0 Composite materials
0 Fatigue and Fracture

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Short Biography

Born in 1988 in the USSR. Graduated from Moscow Institute of Science and Technology in 2011 (master of sceience)

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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 August 2020 in Materials
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3D printing using fused composite filament fabrication technique (FFF) allows prototyping and manufacturing of durable, lightweight, and customizable parts on demand. Such composites demonstrate significantly improved printability, due to the reduction of shrinkage and warping, alongside the enhancement of strength and rigidity. In this work, we use polypropylene filament reinforced by short glass fibers to demonstrate the effect of fiber orientation on mechanical tensile properties of the 3D printed specimens. The influence of the printed layer thickness and raster angle on final fiber orientations was investigated using X-ray micro-computed tomography. The best ultimate tensile strength of 57.4 MPa and elasticity modulus of 5.5 GPa were obtained with a 90° raster angle, versus 30.4 MPa and 2.5 GPa for samples with a criss-cross 45°, 135° raster angle, with the thinnest printed layer thickness of 0.1 mm.

ACS Style

Eugene Shulga; Radmir Karamov; Ivan S. Sergeichev; Stepan D. Konev; Liliya I. Shurygina; Iskander S. Akhatov; Sergey D. Shandakov; Albert G. Nasibulin. Fused Filament Fabricated Polypropylene Composite Reinforced by Aligned Glass Fibers. Materials 2020, 13, 3442 .

AMA Style

Eugene Shulga, Radmir Karamov, Ivan S. Sergeichev, Stepan D. Konev, Liliya I. Shurygina, Iskander S. Akhatov, Sergey D. Shandakov, Albert G. Nasibulin. Fused Filament Fabricated Polypropylene Composite Reinforced by Aligned Glass Fibers. Materials. 2020; 13 (16):3442.

Chicago/Turabian Style

Eugene Shulga; Radmir Karamov; Ivan S. Sergeichev; Stepan D. Konev; Liliya I. Shurygina; Iskander S. Akhatov; Sergey D. Shandakov; Albert G. Nasibulin. 2020. "Fused Filament Fabricated Polypropylene Composite Reinforced by Aligned Glass Fibers." Materials 13, no. 16: 3442.

Journal article
Published: 14 December 2019 in Composite Structures
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The pultrusion of large-diameter glass fiber reinforced epoxy rods at high pulling speed is often accompanied by the formation of cracks at the surface of a profile, leading to product rejection. In this study, we investigate the causes of crack formation based on numerical simulations of manufacturing process mechanics, including the temperature distribution, degree of polymerization, and residual stresses. Based on the built model, we solve the problem of temperature condition optimization for maximizing pulling speed. The results show that up to 27% increases in pulling speed are possible provided that the following conditions are met: thermal destruction of the material is avoided; a profile is cooled sufficiently quickly before cut-off; a high degree of polymerization is achieved in a final product; and there are no cracks in a profile.

ACS Style

Alexander Safonov; Mikhail Gusev; Anton Saratov; Alexander Konstantinov; Ivan Sergeichev; Stepan Konev; Sergey Gusev; Iskander Akhatov. Modeling of cracking during pultrusion of large-size profiles. Composite Structures 2019, 235, 111801 .

AMA Style

Alexander Safonov, Mikhail Gusev, Anton Saratov, Alexander Konstantinov, Ivan Sergeichev, Stepan Konev, Sergey Gusev, Iskander Akhatov. Modeling of cracking during pultrusion of large-size profiles. Composite Structures. 2019; 235 ():111801.

Chicago/Turabian Style

Alexander Safonov; Mikhail Gusev; Anton Saratov; Alexander Konstantinov; Ivan Sergeichev; Stepan Konev; Sergey Gusev; Iskander Akhatov. 2019. "Modeling of cracking during pultrusion of large-size profiles." Composite Structures 235, no. : 111801.

Journal article
Published: 16 September 2019 in Materials
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Developing bone scaffolds can greatly improve the patient’s quality of life by accelerating the rehabilitation process. In this paper, we studied the process of composite polycaprolactone supercritical foaming for tissue engineering. The influence of graphene oxide and reduced graphene oxide on the foaming parameters was studied. The structural and mechanical properties were studied. The scaffolds demonstrated mechanical flexibility and endurance. The co-culturing and live/dead tests demonstrated that the obtained scaffolds are biocompatible. Different composite scaffolds induced various surface cell behaviors. The experimental data demonstrate that composite foams are promising candidates for in vivo medical trials.

ACS Style

Stanislav Evlashin; Pavel Dyakonov; Mikhail Tarkhov; Sarkis Dagesian; Sergey Rodionov; Anastasia Shpichka; Mikhail Kostenko; Stepan Konev; Ivan Sergeichev; Petr Timashev; Iskander Akhatov. Flexible Polycaprolactone and Polycaprolactone/Graphene Scaffolds for Tissue Engineering. Materials 2019, 12, 2991 .

AMA Style

Stanislav Evlashin, Pavel Dyakonov, Mikhail Tarkhov, Sarkis Dagesian, Sergey Rodionov, Anastasia Shpichka, Mikhail Kostenko, Stepan Konev, Ivan Sergeichev, Petr Timashev, Iskander Akhatov. Flexible Polycaprolactone and Polycaprolactone/Graphene Scaffolds for Tissue Engineering. Materials. 2019; 12 (18):2991.

Chicago/Turabian Style

Stanislav Evlashin; Pavel Dyakonov; Mikhail Tarkhov; Sarkis Dagesian; Sergey Rodionov; Anastasia Shpichka; Mikhail Kostenko; Stepan Konev; Ivan Sergeichev; Petr Timashev; Iskander Akhatov. 2019. "Flexible Polycaprolactone and Polycaprolactone/Graphene Scaffolds for Tissue Engineering." Materials 12, no. 18: 2991.