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EFFECT OF MOLDING PRESSURE ON CHARACTERISTICS OF RADIOPROTECTIVE COMPOSITES 成型压力对辐射防护复合材料性能的影响
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030106
V. I. Pavlenko, D. S. Romanyuk, V. V. Kashibadze, O. V. Kuprieva
{"title":"EFFECT OF MOLDING PRESSURE ON CHARACTERISTICS OF RADIOPROTECTIVE COMPOSITES","authors":"V. I. Pavlenko,&nbsp;D. S. Romanyuk,&nbsp;V. V. Kashibadze,&nbsp;O. V. Kuprieva","doi":"10.1134/S0021894424030106","DOIUrl":"10.1134/S0021894424030106","url":null,"abstract":"<p>This paper presents the results of a study of the effect of molding pressure on the characteristics of radioprotective composites based on polyethylene and boron carbide (B<sub>4</sub>C). Software simulation is applied to select a temperature range for heating a press mold of a given size. Experiments are performed to determine the required holding time of the composite and identify defects arising from various deviations from the optimal temperature parameters. The strength of samples under various molding pressure conditions is tested, and the optimal pressure is determined. A composite with the following mechanical characteristics under optimal molding conditions is obtained: density (<span>(1.09 pm 0.01)</span>) g/cm<sup>3</sup>, bending strength <span>((5.72 pm 0.18))</span> MPa, and sound velocity in the composite (<span>(2050.00pm 0.01)</span>) m/s.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"488 - 495"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
NUMERICAL INVESTIGATION ON CHARACTERISTICS OF THE SHOCK WAVE GENERATED BY AN ANNULAR NESTED CHARGE 环形嵌套装药产生激波特性的数值研究
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030027
Jun-bao Li, Wei-bing Li, Xiao-ming Wang
{"title":"NUMERICAL INVESTIGATION ON CHARACTERISTICS OF THE SHOCK WAVE GENERATED BY AN ANNULAR NESTED CHARGE","authors":"Jun-bao Li,&nbsp;Wei-bing Li,&nbsp;Xiao-ming Wang","doi":"10.1134/S0021894424030027","DOIUrl":"10.1134/S0021894424030027","url":null,"abstract":"<p>This study is aimed at understanding some characteristics of the shock wave generated by a novel composite charge consisting of an inner high explosive, a medium non-detonating layer, and an outer aluminized explosive. The influence of the shell restraints and initiation modes on the peak overpressure and impulse of the charge is investigated. Numerical models are developed based on the mapping function of AUTODYN for determining the spatial distribution of the shock wave overpressure. By means of validation experiments, the accuracy of the developed model is verified. It is found that the peak overpressure and impulse obtained from experiments and simulations are in good agreement, with a deviation of less than 16.9%. The difference in the overpressures at various azimuths decreases with increasing distance, and the shock wave profile eventually evolves into a spherical shape. The radial overpressure of the shelled composite charge is initially greater than that in the axial direction and decays rapidly with increasing distance. The azimuth corresponding to the maximum peak overpressure is shifted from 75° for the bare charge to 110° for the shelled charge. It is found that the energy utilization of the composite charge under inner initiation is apparently smaller than that under simultaneous initiation.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"401 - 413"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SPECIFIC FEATURES OF FLAME FORMATION IN A COLLISION OF TWO HYDROGEN JETS 两个氢射流碰撞时火焰形成的具体特征
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030015
A. S. Tambovtsev, V. V. Kozlov, Yu. A. Litvinenko, M. V. Litvinenko, A. G. Shmakov
{"title":"SPECIFIC FEATURES OF FLAME FORMATION IN A COLLISION OF TWO HYDROGEN JETS","authors":"A. S. Tambovtsev,&nbsp;V. V. Kozlov,&nbsp;Yu. A. Litvinenko,&nbsp;M. V. Litvinenko,&nbsp;A. G. Shmakov","doi":"10.1134/S0021894424030015","DOIUrl":"10.1134/S0021894424030015","url":null,"abstract":"<p>Results of studying interaction of two colliding axisymmetric laminar microjets of hydrogen in the course of their diffusion combustion are reported. Gas exhaustion occurs with identical velocities through pairs of micronozzles, which are thin-walled cylindrical tubes with an inner diameter of 200 <span>(mu)</span>m. The transverse positions of the tubes with respect to each other are changed during the experiment. Specific features of flame formation from two interacting microjets are found for different transverse positions of the tubes, and the results are compared with flames of single microjets with the same exhaustion velocity.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"393 - 400"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
COMPUTATIONAL ALGORITHM FOR STUDYING THE CONSTITUTIVE RELATIONS OF THE ENDOCHRONIC THEORY OF THERMOPLASTICITY FOR ISOTROPIC MATERIALS 研究各向同性材料热塑性内时理论本构关系的计算算法
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030118
G. N. Kuvyrkin, D. R. Rakhimov
{"title":"COMPUTATIONAL ALGORITHM FOR STUDYING THE CONSTITUTIVE RELATIONS OF THE ENDOCHRONIC THEORY OF THERMOPLASTICITY FOR ISOTROPIC MATERIALS","authors":"G. N. Kuvyrkin,&nbsp;D. R. Rakhimov","doi":"10.1134/S0021894424030118","DOIUrl":"10.1134/S0021894424030118","url":null,"abstract":"<p>It is proposed to use the relations of the endochronic theory of thermoplasticity to describe the nonlinear deformation of isotropic materials under non-isothermal loading. A version of the constitutive relations in integral and differential form is given for the general loading case. Based on the results of uniaxial tension (torsion) tests, analytical relations are determined for a number of material parameters of the model. A numerical algorithm based on the Euler method with inner iteration carried out by the Seidel method is proposed to analyze the constitutive relations. An example of numerical calculation of the uniaxial tension of a rod under complex thermal force loading. It is shown that the calculation results are in satisfactory agreement with the results obtained using the flow theory of plasticity with isotropic hardening.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"496 - 501"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
MECHANICAL PROPERTIES OF SALMONELLA TYPHIMURIUM AND LISTERIA MONOCYTOGENES BACTERIA 鼠伤寒沙门菌和单核增生李斯特菌的力学特性
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030209
I. Rezaei, A. Sadeghi
{"title":"MECHANICAL PROPERTIES OF SALMONELLA TYPHIMURIUM AND LISTERIA MONOCYTOGENES BACTERIA","authors":"I. Rezaei,&nbsp;A. Sadeghi","doi":"10.1134/S0021894424030209","DOIUrl":"10.1134/S0021894424030209","url":null,"abstract":"<p>\u0000\t\t\t\t\t<i>Salmonella typhimurium</i> and <i>Listeria monocytogenes</i> bacteria, which are two important bacteria used for bacterial therapy purposes in order to limit tumor growth, are studied. Mechanical specifications of the bacteria obtained applying nanoindentation with the use of atomic force microscopy (AFM) are reported. The results show that <i>Salmonella typhimurium</i> bacteria have a greater elastic modulus, but smaller adhesion than <i>Listeria monocytogenes</i> bacteria. The elastic modulus of the AFM extension stroke is larger than that of the retraction stroke. The resonant frequencies and amplitudes of the frequency response function of the AFM beam’s vertical movements with two bacteria as samples are investigated using the finite element method. The results show that an increase in the elastic modulus of the sample raises the resonant frequency; therefore, the resonant frequency of <i>Salmonella typhimurium</i> bacteria is greater than that of <i>Listeria monocytogenes</i> bacteria. The results obtained by the finite element method and experimental techniques are found to be in good agreement.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"582 - 593"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
USE OF ONE-DIMENSIONAL NETWORK MODELS OF BLOOD FLOW TO ASSESS HEMODYNAMIC INDICES IN STENOTIC CORONARY ARTERIES 应用一维血流网络模型评估狭窄冠状动脉血流动力学指标
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030180
S. S. Simakov
{"title":"USE OF ONE-DIMENSIONAL NETWORK MODELS OF BLOOD FLOW TO ASSESS HEMODYNAMIC INDICES IN STENOTIC CORONARY ARTERIES","authors":"S. S. Simakov","doi":"10.1134/S0021894424030180","DOIUrl":"10.1134/S0021894424030180","url":null,"abstract":"<p>This paper presents an analysis of the effectiveness of using one-dimensional network models for virtual assessment of the hemodynamic indices widely used in clinical practice to choose a treatment strategy for coronary heart disease with stenotic coronary arteries. It is shown that existing approaches make it is possible to assess hemodynamic indices based on clinical data collected without intervention into the body with an accuracy comparable to the accuracy of the input data and direct measurements. It is also important to take into account the state of the myocardial microvasculature and its influence on the interpretation of modeling results and direct clinical measurements.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"563 - 572"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
STUDY OF RESTRAINED TORSION OF THIN-WALLED OPEN-SECTION BEAMS USING THE ASYMPTOTIC SPLITTING METHOD 用渐近分裂法研究薄壁开截面梁的约束扭转
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S002189442403012X
A. G. Gorynin, G. L. Gorynin, S. K. Golushko
{"title":"STUDY OF RESTRAINED TORSION OF THIN-WALLED OPEN-SECTION BEAMS USING THE ASYMPTOTIC SPLITTING METHOD","authors":"A. G. Gorynin,&nbsp;G. L. Gorynin,&nbsp;S. K. Golushko","doi":"10.1134/S002189442403012X","DOIUrl":"10.1134/S002189442403012X","url":null,"abstract":"<p>A problem of restrained torsion of thin-walled beams under the action of an end torque is considered. The asymptotic splitting method is applied to obtain a system of resolving equations that describes combined torsion, tension-compression, and bending of the beam. The example of typical cross sections is used to compare the resulting model with a stress-strain state in the beam, determined in the calculation using the developed model and three-dimensional numerical calculation by the finite element method. The resulting mathematical model is analyzed and its advantages are revealed and compared to the widely used Vlasov theory. It is shown that the developed model does not contain the restrictions imposed by the Vlasov theory hypotheses, such as the nondeformability of the cross-sectional contour and the absence of shear strains on the middle surface. The resulting model makes it possible in many cases to more accurately determine the emerging stress-strain state. In particular, it is shown that the developed model accounts for the presence of a boundary layer near the clamped end, which arises during torsion of angle sections and makes a significant contribution to longitudinal stresses, while the Vlasov theory does not allow for the recovery of the arising longitudinal stresses.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"502 - 518"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DESIGNING A NEW EXPERIMENTAL SYSTEM FOR STUDYING SLIDING ON SNOW 设计一种新的研究雪地滑行的实验系统
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030179
A. Yu. Larichkin, D. V. Tikhvinskii, D. V. Parshin
{"title":"DESIGNING A NEW EXPERIMENTAL SYSTEM FOR STUDYING SLIDING ON SNOW","authors":"A. Yu. Larichkin,&nbsp;D. V. Tikhvinskii,&nbsp;D. V. Parshin","doi":"10.1134/S0021894424030179","DOIUrl":"10.1134/S0021894424030179","url":null,"abstract":"<p>In this paper, we present a brief review of experimental approaches to the study of the sliding tribology of various bodies on snow or ice and propose a model and a digital twin of a tribological system. The distribution of the deformation of a tank filled with snow rotating at a specific speed was obtained by numerical simulation, and the work done by the friction force per sliding cycle was determined by testing the motion of a ski sample on a flat snow surface. The proposed system can be used to evaluate the sliding performance on snow at given temperature, snow structure, humidity, and the roughness of the ski surface sliding on snow.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"554 - 562"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EVOLUTION OF THE MATHEMATICAL MODEL CHARACTERIZING THE THERMAL FIELD DEVELOPED IN SUBMERGED ARC WELDING 埋弧焊热场数学模型的演化
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030076
J. Dutta
{"title":"EVOLUTION OF THE MATHEMATICAL MODEL CHARACTERIZING THE THERMAL FIELD DEVELOPED IN SUBMERGED ARC WELDING","authors":"J. Dutta","doi":"10.1134/S0021894424030076","DOIUrl":"10.1134/S0021894424030076","url":null,"abstract":"<p>A two-dimensional exact analytical solution of the thermal field developed during the submerged arc welding process with visualization of the thermal surface contour for analyzing the heat flow in the domain with the hybrid application of Duhamel’s theorem and finite integral transform approach is obtained. The thermal field arising in submerged arc welding of thick EH36 steel plates is studied. An ellipsoidal heat source model is assumed. The developed thermal field is investigated with variations of several process parameters, such as the heat source velocity, heat input, and lag time of movement of the heat source involved in the welding process.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"456 - 464"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
TORSION OF A TWO-LAYER ELASTIC ROD WITH A BOX SECTION 具有箱形截面的两层弹性杆的扭力
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030155
S. I. Senashov, I. L. Savostyanova, A. Yu. Vlasov
{"title":"TORSION OF A TWO-LAYER ELASTIC ROD WITH A BOX SECTION","authors":"S. I. Senashov,&nbsp;I. L. Savostyanova,&nbsp;A. Yu. Vlasov","doi":"10.1134/S0021894424030155","DOIUrl":"10.1134/S0021894424030155","url":null,"abstract":"<p>A two-layer rod with a box section twisted by angle <span>(theta)</span> under the action of shear stresses is considered. It is assumed that the rod deformations are elastic and its lateral surface is stress-free. The layers have different elastic properties and different thicknesses. The contact line between the layers is assumed to be rigid, i.e., the stresses on it are the same. An exact solution describing the stress state of this structure is constructed using conservation laws. The stress state is determined at each point of the cross section using outer contour integrals.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"536 - 542"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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