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COMPUTATIONAL ALGORITHM FOR STUDYING THE CONSTITUTIVE RELATIONS OF THE ENDOCHRONIC THEORY OF THERMOPLASTICITY FOR ISOTROPIC MATERIALS
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
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
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
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
EVOLUTION OF THE MATHEMATICAL MODEL CHARACTERIZING THE THERMAL FIELD DEVELOPED IN SUBMERGED ARC WELDING
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
DESIGNING A NEW EXPERIMENTAL SYSTEM FOR STUDYING SLIDING ON SNOW
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
THERMOVISCOELASTIC MODEL OF SURFACE LAYER TREATMENT WITH VARIABLE VISCOSITY
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S002189442403009X
A. G. Knyazeva
{"title":"THERMOVISCOELASTIC MODEL OF SURFACE LAYER TREATMENT WITH VARIABLE VISCOSITY","authors":"A. G. Knyazeva","doi":"10.1134/S002189442403009X","DOIUrl":"10.1134/S002189442403009X","url":null,"abstract":"<p>The behavior of a material under laser surface treatment taking into account melting is described. A Maxwell model accounting for the changes in heat capacity and viscosity with changing temperature and material composition is presented. Based on this model, a model describing the change in the properties of a flat layer material subjected to a moving heat source is developed. An algorithm for the numerical solution of the formulated problem is presented. Examples are given showing the effect of heat loss, coupling, melting, chemical reactions, and their acceleration due to the stress work on the properties of the material.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"476 - 487"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798395","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
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
PHYSICOMATHEMATICAL MODELING OF PROJECTILE PENETRATION INTO FLEXIBLE FABRIC TARGETS
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030167
A. V. Petyukov, A. I. Bobrova, I. R. Grishin, D. A. Ivanov, M. Yu. Sotskii
{"title":"PHYSICOMATHEMATICAL MODELING OF PROJECTILE PENETRATION INTO FLEXIBLE FABRIC TARGETS","authors":"A. V. Petyukov,&nbsp;A. I. Bobrova,&nbsp;I. R. Grishin,&nbsp;D. A. Ivanov,&nbsp;M. Yu. Sotskii","doi":"10.1134/S0021894424030167","DOIUrl":"10.1134/S0021894424030167","url":null,"abstract":"<p>A simplified numerical method for simulating projectile penetration into fabric targets is proposed which takes into account the weavearchitecture, inter-yarn friction, projectile–fabric friction, and the transverse dimensions of the fabric. The necessary design parameters were selected from a comparison of experimental and calculated data. The proposed method was used to estimate the ballistic resistance of a composite armor reducing the after-penetration effect. The influence of the projectile shape on the ballistic resistance of fabric armor was investigated.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"543 - 553"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798401","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
INCREASE IN APPROXIMATION ORDER OF CALCULATIONS OF WAVE PROCESSES IN A COMPOSITE SAMPLE WHEN USING AN UNSTRUCTURED COMPUTATIONAL GRID
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-12-09 DOI: 10.1134/S0021894424030143
A. V. Vasyukov, I. B. Petrov
{"title":"INCREASE IN APPROXIMATION ORDER OF CALCULATIONS OF WAVE PROCESSES IN A COMPOSITE SAMPLE WHEN USING AN UNSTRUCTURED COMPUTATIONAL GRID","authors":"A. V. Vasyukov,&nbsp;I. B. Petrov","doi":"10.1134/S0021894424030143","DOIUrl":"10.1134/S0021894424030143","url":null,"abstract":"<p>A grid-characteristic numerical method based on tetrahedron grids is applied to simulate wave processes in a composite material under the action of a pulsed shock load. An approach is proposed to increase the approximation order of the method on an unstructured grid in the three-dimensional case. Computational results for load pulse propagation in a three-layer composite are presented.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 3","pages":"528 - 535"},"PeriodicalIF":0.5,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798391","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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