Dr. Raycho Petrov Raychev
Technical University of Sofia, Sofia, Sofia-Grad, Bulgaria
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Academic Career Length
10Years (2017-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
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Journal Article
BCBozhana Chuchulska
Bozhana ChuchulskaIHIlian Hristov
Ilian Hristov
Boyan Angelov DochevRaycho Petrov RaychevContemporary thermoplastic monomer-free prosthetic materials are widely used nowadays, and there are a great variety available on the market. These materials are of interest in terms of the improvement of the quality features of the removable dentures. The aim of this study is to establish how minimal changes in the laboratory protocol of polyamide prosthetic base materials influence the surface texture. Two polyamide materials intended for the fabrication of removable dentures bases were used—Perflex Biosens (BS) and VertexTM ThermoSens (TS). A total number of 20 coin-shaped samples were prepared. They were injected under two different modes—regular, as provided by the manufacturer, and modified, proposed by the authors of this study. Scanning electronic microscopy (SEM) under four magnifications—×1000, ×3000, ×5000, and ×10,000—was conducted. With minimal alterations to the melting temperature (5 °C) and the pressure (0.5 Bar), in Biosens, no changes in terms of surface improvement were found, whereas in ThermoSens, the surface roughness of the material significantly changed in terms of roughness reduction. By modifying the technological mode during injection molding, a smoother surface was achieved in one of the studied materials.
16 June 2021 in ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference
Journal Article
Raycho Petrov RaychevIDIvanka Delova
Ivanka Delova
The article presents specialized software methods for reducing stress concentration. Objects of study are cylindrical test specimens subjected to axial loading. Notching with different shapes and sizes on the specimens were formed to reduce the stresses in the endangered areas. The geometric parameters of notches identified through the specialized built-in modules to the ANSYS software. An analysis performed were to show the influence of stresses acting on the fatigue limit during different cycles. The results of the study were present in a graphical form.
28 June 2017 in New Space
Journal Article
As the world's space agencies and commercial entities continue to expand beyond Low Earth Orbit (LEO), novel approaches to carry out biomedical experiments with animals are required to address the challenge of adaptation to spaceflight and new planetary environments. The extended time and distance of space travel along with reduced involvement of Earth-based mission support increase the cumulative impact of the risks encountered in space. To respond to these challenges, it becomes increasingly important to develop the capability to manage animal safety and well-being during transportation and research experiments in space. One approach may be to take advantage of an organism's self-regulatory system, which enables them to better adapt and mitigate harmful environmental factors encountered in spaceflight. Recent technological advances have enabled researchers to suppress or enhance metabolism “on demand” in a variety of animal species. These animal models can be used as “pathfinders,” which are capable of tolerating the environmental extremes exhibited in spaceflight, including altered gravity, exposure to space radiation, chemically reactive planetary environments, and temperature extremes. In this report, we survey several of the pivotal metabolic flexibility studies and discuss the importance of utilizing animal models with metabolic flexibility with particular attention given to the ability to suppress the organism's metabolism in spaceflight experiments beyond LEO. The presented analysis demonstrates the adjuvant benefits of these factors to minimize damage caused by exposure to spaceflight and extreme planetary environments. Examples of microorganisms and animal models with dormancy capabilities suitable for space research are considered in the context of their survivability under hostile or deadly environments outside of Earth. Potential steps toward implementation of metabolic control technology in spaceflight architecture and its benefits for animal experiments and manned space exploration missions are discussed.
1 June 2020 in IOP Conference Series: Materials Science and Engineering
Conference Paper
NGN P Georgiev
N P Georgiev
Raycho Petrov RaychevThis paper studies the output electrical parameters of a linear generator with permanent magnets without an iron core for three types of electrical connection of its windings. Software simulations have been performed by means of ANSYS 2019 R1 and FEMM, and experimental studies of the linear generator have been carried out. A model has been obtained, which simulates the operation of the generator under study with good level of precision. The optimal scheme of connecting the generator windings, which is suitable for practical realization, has been determined.
Conference Paper
IDIvanka Delova
Ivanka DelovaTBTsvetomir Borisov
Tsvetomir BorisovYMYordan Mirchev
Yordan MirchevRaycho Petrov RaychevThis study presents a numerical model for analyzing fatigue crack growth in 42CrMo4 steel pivot bolts under different heat treatments and service loads. The finite element method (FEM) in the ANSYS Workbench environment (version 2019R1) (SMART Crack Growth), along with algorithms based on Paris’s law implemented in MATLAB (version R2016a), was used. The results highlight the significant influence of heat treatment on fatigue resistance and serve as a basis for optimizing design parameters and improving the durability of the structural components.
16 June 2021 in ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference
Journal Article
Raycho Petrov RaychevIDIvanka Delova
Ivanka Delova
The article presents studies related to the reduction of stress concentration acting on prismatic specimen subject to axial loading. Using ANSYS software, a topological optimization was performed which aims to reduce the stresses in the endangered areas. The aim of identification of the geometric parameters accomplished after the completion of topological optimization of the objective function is to minimize the stresses in the engaged areas. An analysis performed were to show the influence of stresses acting on the fatigue limit during different cycles. The results of the study were present in a graphical form.
About Me
Raycho Petrov Raychev earned an MS in Mechanical Engineering (2002) and a Ph.D. in Applied Mechanics (2015), focused on the optimization of hydraulic vibration isolators, from the Technical University of Sofia, Plovdiv Branch. He is currently an Associate Professor in the Department of Mechanics and Vice Dean of Scientific and Applied Activity at the Faculty of Mechanical and Instrument Engineering, Technical University of Sofia – Plovdiv Branch. Associate Professor Raychev has over two decades of academic and research experience in the field of Applied Mechanics. He has authored and co-authored numerous scientific publications and has delivered a wide range of lectures and courses on mechanics. His teaching portfolio includes both undergraduate and graduate programs. His research focuses on computational modeling and the simulation of mechanical systems, with a particular interest in the fatigue and fracture behavior of structural components, the mechanics of deformable solids, and the dynamic analysis of mechanical drives. He also actively applies tools such as ANSYS, SolidWorks, and MATLAB in his academic and research work. Associate Professor Raychev is involved in scientific mentoring and regularly participates in academic committees and university research initiatives that aim to bridge theoretical mechanics with practical engineering applications.