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Usov A. prats, Suchasni tekhnolohii v mashinobuduvanni. Savruk M. Popov G. Popov G. Tekhnologiia elektrotekhnicheskogo proizvodstva. Simulation of thermomechanical processes in functionally-gradient materials of inhomogeneous structure in the manufacturing and operation of rocket structural elements Автори: Usov A. Simulation of thermomechanical processes in functionally-gradient materials of inhomogeneous structure in the manufacturing and operation of rocket structural elements Автори: Usov A. Simulation of thermomechanical processes in functionally-gradient materials of inhomogeneous structure in the manufacturing and operation of rocket structural elements Автори: Usov A.
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15. Simulation of thermomechanical processes in functionally-gradient materials of inhomogeneous structure in the manufacturing and operation of rocket structural elements

Organization:

Institute of Mechanical Engineering of Odessa National Polytechnic University, Odessa, Ukraine

Page: Kosm. teh. Raket. vooruž. 2020, (1); 137-148

DOI: https://doi.org/10.33136/stma2020.01.137

Language: Ukrainian

Annotation: The strength of real solids depends essentially on the defect of the structure. In real materials, there is always a large number of various micro defects, the development of which under the influence of loading leads to the appearance of cracks and their growth in the form of local or complete destruction. In this paper, based on the method of singular integral equations, we present a unified approach to the solution of thermal elasticity problems for bodies weakened by inhomogeneities. The purpose of the work is to take into account the heterogeneities in the materials of the elements of the rocket structures on their functionally-gradient properties, including strength. The choice of the method of investigation of strength and destruction of structural elements depends on the size of the object under study. Micro-research is related to the heterogeneities that are formed in the surface layer at the stage of preparation, the technology of manufacturing structural elements. Defectiveness allows you to adequately consider the mechanism of destruction of objects as a process of development of cracks. In studying the limit state of real elements, weakened by defects and constructing on this basis the theory of their strength and destruction in addition to the deterministic one must consider the probabilistic – statistical approach. In the case of thermal action on structural elements in which there are uniformly scattered, non-interacting randomly distributed defects of the type of cracks, the laws of joint distribution of the length and angle of orientation of which are known, the limiting value of the heat flux for the balanced state of the crack having the length of the “weakest link” is determined. The influence of heterogeneities of technological origin (from the workpiece to the finished product) that occur in the surface layer in the technology of manufacturing structural elements on its destruction is taken into account by the developed model. The strength of real solids depends essentially on the defect of the structure. In real materials, there are always many various micro defects, the development of which under the influence of loading leads to the appearance of cracks and their growth in the form of local or complete destruction. In this paper, based on the method of singular integral equations, we present a unified approach to the solution of thermal elasticity problems for bodies weakened by inhomogeneities. The purpose of the work is to take into account the heterogeneities in the materials of the elements of the rocket structures on their functionally gradient properties, including strength. The choice of the method of investigation of strength and destruction of structural elements depends on the size of the object under study. Micro-research is related to the heterogeneities that are formed in the surface layer at the stage of preparation, the technology of manufacturing structural elements. Defectiveness allows you to adequately consider the mechanism of destruction of objects as a process of development of cracks. In studying the limit state of real elements, weakened by defects and constructing on this basis the theory of their strength and destruction besides the deterministic one must consider the probabilistic – statistical approach. With thermal action on structural elements in which there are uniformly scattered, non-interacting randomly distributed defects of the cracks, the laws of joint distribution of the length and angle of orientation of which are known, the limiting value of the heat flux for the balanced state of the crack having the length of the “weakest link” is determined. The influence of heterogeneities of technological origin (from the workpiece to the finished product) that occur in the surface layer in the technology of manufacturing structural elements on its destruction is taken into account by the developed model. The solution of the singular integral equation with the Cauchy kernel allows one to determine the intensity of stresses around the vertexes of defects of the cracks, and by comparing it with the criterion of fracture toughness for the material of a structural element, one can determine its state. If this criterion is violated, the weak link defect develops into a trunk crack. Also, a criterion correlation of the condition of the equilibrium defect condition with a length of 2l was got, depending on the magnitude of the contact temperature. When the weld is cooled, it develops “hot cracks” that lead to a lack of welding elements of the structures. The results of the simulation using singular integral equations open the possibility to evaluate the influence of thirdparty fillers on the loss of functional properties of inhomogeneous systems. The exact determination of the order and nature of the singularity near the vertices of the acute-angled imperfection in the inhomogeneous medium, presented in the analytical form, is necessary to plan and record the corresponding criterion relations to determine the functional properties of inhomogeneous systems.

Key words: mathematical model, linear systems, singular integral equations, impulse response, defects, criteria for the destruction of stochastically defective bodies, Riemann problem, thermoelastic state

Bibliography:
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15.1.2020  Simulation of thermomechanical processes in functionally-gradient materials of inhomogeneous structure in the manufacturing and operation of rocket structural elements
15.1.2020  Simulation of thermomechanical processes in functionally-gradient materials of inhomogeneous structure in the manufacturing and operation of rocket structural elements
15.1.2020  Simulation of thermomechanical processes in functionally-gradient materials of inhomogeneous structure in the manufacturing and operation of rocket structural elements

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20.1.2016 Determination of External Characteristic of Autonomous WPP for Regulation by Rotor Withdrawal from under Wind https://journal.yuzhnoye.com/content_2016_1/annot_20_1_2016-en/ Tue, 23 May 2023 13:15:41 +0000 https://journal.yuzhnoye.com/?page_id=27641
, Popov V. Content 2016 (1) Downloads: 20 Abstract views: 118 Dynamics of article downloads Dynamics of abstract views Downloads geography Country City Downloads USA Baltimore; Monroe; Seattle; Ashburn; Boardman; Seattle; Portland; San Mateo; Boardman; Ashburn; Boardman 11 Singapore Singapore; Singapore; Singapore; Singapore; Singapore; Singapore; Singapore 7 Ukraine Dnipro; Dnipro 2 Downloads, views for all articles Articles, downloads, views by all authors Articles for all companies Geography of downloads articles Kalnysh R. V., Popov V. Available at: . V., Popov V. Missile armaments, vol. V., Popov V. V., Popov V. V., Popov V. V., Popov V. More Citation Formats Harvard Chicago IEEE AIP ДСТУ 8302:2015 ДСТУ ГОСТ 7.1:2006 (ВАК) ISO 690:2010 BibTeX на сайт ДП «КБ «Південне»
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20. Determination of External Characteristic of Autonomous WPP for Regulation by Rotor Withdrawal from under Wind

Organization:

Yangel Yuzhnoye State Design Office, Dnipro, Ukraine

Page: Kosm. teh. Raket. vooruž. 2016 (1); 122-127

Language: Russian

Annotation: The procedure and program were developed for calculation of rotor external characteristic (rotor rotation frequency as a function of load moment and wind speed) for autonomous wind power plants operating according to the scheme of power regulation by rotor withdrawal from under wind.

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20.1.2016 Determination of External Characteristic of Autonomous WPP for Regulation by Rotor Withdrawal from under Wind
20.1.2016 Determination of External Characteristic of Autonomous WPP for Regulation by Rotor Withdrawal from under Wind
20.1.2016 Determination of External Characteristic of Autonomous WPP for Regulation by Rotor Withdrawal from under Wind
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9.1.2016 Evaluation of SRM Intraballistic Parameters Scatter by Monte-Carlo Method https://journal.yuzhnoye.com/content_2016_1/annot_9_1_2016-en/ Tue, 23 May 2023 13:04:25 +0000 https://journal.yuzhnoye.com/?page_id=27617
Evaluation of SRM Intraballistic Parameters Scatter by Monte-Carlo Method Authors: Fomenko V. , Popov V. The problem is solved by Monte Carlo method (statistic tests) which allows constructing the function of distribution of composition (sum, product) of random values of specified distribution laws. The accuracy of problem solution is determined by quality of pseudo random values generation. V., Popov V. Available at: . V., Popov V. Missile armaments, vol. Evaluation of SRM Intraballistic Parameters Scatter by Monte-Carlo Method Автори: Fomenko V. V., Popov V. V., Popov V. V., Popov V. V., Popov V. More Citation Formats Harvard Chicago IEEE AIP ДСТУ 8302:2015 ДСТУ ГОСТ 7.1:2006 (ВАК) ISO 690:2010 BibTeX на сайт ДП «КБ «Південне»
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9. Evaluation of SRM Intraballistic Parameters Scatter by Monte-Carlo Method

Organization:

Yangel Yuzhnoye State Design Office, Dnipro, Ukraine

Page: Kosm. teh. Raket. vooruž. 2016 (1); 59-62

Language: Russian

Annotation: The purpose of work is development of simple and accurate procedure of calculation of scatter of SRM intraballistic parameters – combustion chamber pressure and combustion products flow rate. The problem is solved by Monte Carlo method (statistic tests) which allows constructing the function of distribution of composition (sum, product) of random values of specified distribution laws. The accuracy of problem solution is determined by quality of pseudo random values generation.

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9.1.2016 Evaluation of SRM Intraballistic Parameters Scatter by Monte-Carlo Method
9.1.2016 Evaluation of SRM Intraballistic Parameters Scatter by Monte-Carlo Method
9.1.2016 Evaluation of SRM Intraballistic Parameters Scatter by Monte-Carlo Method
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