Mechanics of Solids最新文献_第2页

Tensor Nonlinear Viscoelastic Models of the Maxwell Type: Vibration Creep and Ratcheting 麦克斯韦类型的张量非线性粘弹性模型：振动蠕变和棘轮效应

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2024-11-01 DOI: 10.1134/S0025654423602185

D. V. Georgievskii

引用次数: 0

Negative Creep of Single Crystals of Nickel–Based Superalloys 镍基超合金单晶的负蠕变

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2024-11-01 DOI: 10.1134/S0025654424604452

A. I. Epishin, D. S. Lisovenko

引用次数: 0

Hygrothermal-Magnetic Dynamics of Functionally Graded Porous Nanobeams on Viscoelastic Foundation 粘弹性地基上功能分级多孔纳米梁的湿热磁动力学

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2024-11-01 DOI: 10.1134/S0025654424603756

M. Mahaveer Sree Jayan, Lifeng Wang

{"title":"Hygrothermal-Magnetic Dynamics of Functionally Graded Porous Nanobeams on Viscoelastic Foundation","authors":"M. Mahaveer Sree Jayan, Lifeng Wang","doi":"10.1134/S0025654424603756","DOIUrl":"10.1134/S0025654424603756","url":null,"abstract":"The study focuses on the application of Haar wavelet discretization method (HWDM) and the differential quadrature method (DQM) to analyse the free vibration of a piezoelectric functionally graded porous (FGP) curved nanobeam embedded in a Kelvin-Voigt viscoelastic foundation and subjected to a hygrothermal magnetic environment. The nanobeam is composed of aluminium (Al) as the metal constituent and alumina (Al2O3) as the ceramic constituent, with material properties changing continuously along the thickness via a power-law distribution and described by an uneven porosity distribution. Base on Hamilton’s principle, grounded in quasi-3D higher-order shear deformation beam theory and nonlocal elasticity theory is employed to derive the governing equation for the FGP curved nanobeam. Pointwise convergence studies for HWDM and DQM have been conducted to exhibit the effectiveness of the methods. The study incorporates a Winkler-Pasternak-Visco elastic foundation model, assuming a Kelvin-Voigt-type viscoelastic foundation. Precision of the current model is effectively demonstrated through a comparative analysis of results obtained using both HWDM and DQM, showcasing outstanding accuracy. A comprehensive exploration of the power-law exponent, porosity volume fraction index, and thickness to material length scale parameter is undertaken to assess their impact on the natural frequencies. The investigation encompasses various boundary conditions, namely simply supported (S-S), clamped-clamped (C-C), clamped-free (C-F), and simply supported-free (S-F), elucidated with in-depth physical explanations. Additionally, mode shapes are graphically presented to qualitatively evaluate the dynamics of the structural component.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565881","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

Motion of a Variable Body in a Time-Dependent Force Field 变体在随时间变化的力场中的运动

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2024-11-01 DOI: 10.1134/S0025654424602878

A. A. Burov, V. I. Nikonov

引用次数: 0

Analytical Method Based on Machine Learning (AM-BML) for a Cased Borehole under Anisotropic In-Situ Stresses in Formation 地层中各向异性原位应力下套管钻孔的基于机器学习的分析方法 (AM-BML)

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2024-11-01 DOI: 10.1134/S0025654424603884

Y. Xia, B. Zhou, C. Zhang, X. Zhu, S. Zhou, J. Li, H. Wang, C. Wang

{"title":"Analytical Method Based on Machine Learning (AM-BML) for a Cased Borehole under Anisotropic In-Situ Stresses in Formation","authors":"Y. Xia, B. Zhou, C. Zhang, X. Zhu, S. Zhou, J. Li, H. Wang, C. Wang","doi":"10.1134/S0025654424603884","DOIUrl":"10.1134/S0025654424603884","url":null,"abstract":"In this work, an analytical method based on machine learning (AM-BML) is proposed to predict the stress distribution around a cased borehole in the formation with anisotropic in-situ stresses. Firstly, the stress field equations with undetermined coefficients are derived using the elasticity theory to formulate the stress field near the cased borehole. Secondly, the regression functions of a machine learning algorithm, least squares support vector machine (LS-SVM), are constructed according to the derived stress field equations. Thirdly, the undetermined coefficient equations are developed to determine the undetermined coefficients in the derived stress field equations according to the constructed LS-SVM regression functions and the derived stress field equations. The derived stress field equations and the developed undetermined coefficient equations together constitute the proposed AM-BML, which can well predict the stress distribution around a cased borehole in the formation with anisotropic in-situ stresses. Compared with the traditional analytical methods, the proposed AM-BML is more convenient for practical applications because it is difficult and complex to determine the undetermined coefficient in the stress field equations according to the traditional analytical methods. Finally, the proposed AM-BML is validated through the comparisons with numerical simulation experiments; and it is also used to investigate the influencing factors on the stress field of a cased borehole system, which gives some useful results. This work is helpful for the study of borehole stability and the other study related to the petroleum engineering.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565897","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

Investigation of Thermoelastic behavior in a Three-Dimensional Homogeneous Half-Space with Reference Temperature-Dependent Material Properties 研究具有参考温度相关材料特性的三维均质半空间中的热弹性行为

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2024-11-01 DOI: 10.1134/S0025654424603872

Nantu Sarkar

{"title":"Investigation of Thermoelastic behavior in a Three-Dimensional Homogeneous Half-Space with Reference Temperature-Dependent Material Properties","authors":"Nantu Sarkar","doi":"10.1134/S0025654424603872","DOIUrl":"10.1134/S0025654424603872","url":null,"abstract":"This research investigates the thermoelastic behavior of a three-dimensional homogeneous half-space with temperature-dependent material properties. The study aims to address the limitations of previous analysis that primarily focused on materials with temperature-independent properties, which may not accurately represent real-world scenarios, particularly in high-temperature environments. By incorporating the Lord–Shulman model and employing analytical techniques such as normal mode analysis and eigenvalue approach, analytical solutions are derived for temperature, stress, strain, displacement, and thermal stresses. The effects of temperature-dependent modulus of elasticity and Poisson’s ratio on these physical quantities are explored. Numerical examples illustrate the variations of physical quantities under different material properties, highlighting the significant influences of temperature dependency and Poisson’s ratio on stress, strain, displacement, and thermal stresses. Additionally, three-dimensional distributions of physical quantities with respect to distance and time provide comprehensive insights into their spatiotemporal behavior. This research contributes to a deeper understanding of thermoelastic phenomena in materials with temperature-dependent properties.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565862","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

On the Reconstruction of a Two-Dimensional Density of a Functionally Graded Elastic Plate 论功能梯度弹性板二维密度的重构

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2024-11-01 DOI: 10.1134/S0025654424602532

V. V. Dudarev, R. M. Mnukhin

{"title":"On the Reconstruction of a Two-Dimensional Density of a Functionally Graded Elastic Plate","authors":"V. V. Dudarev, R. M. Mnukhin","doi":"10.1134/S0025654424602532","DOIUrl":"10.1134/S0025654424602532","url":null,"abstract":"In this work, based on the general formulation of the problem of steady-state vibrations of an inhomogeneous elastic isotropic body, a direct problem of planar vibrations of a rectangular plate within the framework of a plane stress state is formulated. The left side of the plate is rigidly fixed, vibrations are forced by tensile load applied at the right side. The properties of the functionally graded material are described by two-dimensional laws of change in Young’s modulus, Poisson’s ratio and density. For generality of consideration, a dimensionless formulation of the problem is given. The solution to the direct problem of determining the displacement field was obtained using the finite element method. The effect of material characteristics on the displacement field and the value of the first resonant frequency are shown. An analysis of the obtained results was carried out. The inverse problem of determining the law of density from data on the values of the displacement field components at a fixed frequency is considered. To reduce the error in calculating derivatives of table functions of two variables, an approach based on spline approximation and a locally weighted regression algorithm is proposed. Reconstruction examples of different laws are presented to demonstrate the possibility of using this approach.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565904","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

The Nye Cells and Figures for Athermic Hemitropic, Isotropic, and Ultraisotropic Micropolar Elastic Solids 各向同性、各向同性和超各向同性微波弹性固体的奈氏单元和数字

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2024-11-01 DOI: 10.1134/S0025654424603719

E. Yu. Krylova, E. V. Murashkin, Y. N. Radaev

引用次数: 0

Proper Motions of the Flat Structure of Cosserat Type 科塞拉特型平面结构的适当运动

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2024-11-01 DOI: 10.1134/S0025654424603148

G. L. Brovko, V. V. Kozhukhov, E. D. Martynova

引用次数: 0

Dynamic modeling and Multi-Objective Optimization of a 3DOF Reconfigurable Parallel Robot 3DOF 可重构并行机器人的动态建模和多目标优化

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2024-11-01 DOI: 10.1134/S0025654424603483

M. R. Salehi Kolahi, H. Moeinkhah, H. Rahmani, A. Mohammadzadeh

{"title":"Dynamic modeling and Multi-Objective Optimization of a 3DOF Reconfigurable Parallel Robot","authors":"M. R. Salehi Kolahi, H. Moeinkhah, H. Rahmani, A. Mohammadzadeh","doi":"10.1134/S0025654424603483","DOIUrl":"10.1134/S0025654424603483","url":null,"abstract":"The reconfigurable parallel robots are highly adaptable to different tasks and environments, making them suitable for a wide range of industrial and medical applications. Optimizing the geometrical and structural parameters is a crucial aspect of designing a parallel robot. However, due to different degrees of freedom and workspaces, the optimization of reconfigurable parallel robots is a challenge. This paper presents the design, unified dynamic modeling and multi-objective optimization methodology of an innovative 3UPS-PU/S robot. This parallel robot can be reconfigured from a Tricept mechanism into a fully spherical mechanism through the reconfiguration of the PU/S central passive limb. For this purpose, the unified dynamic model of the robot is derived. With respect to workspace, manipulability and dynamic dexterity, three performance indices are considered as the objective functions. The robot is optimized with respect to the design and geometrical constraints using the non-dominated sorting genetic algorithm II (NSGA-II), which is used to find the Pareto fronts. The obtained solutions are a set of optimal geometric parameters to adjust the kinematic and dynamic performances. The results depict that the process effectively identified a 3UPS-PU/S robot with an efficient dexterous workspace. Also, based on the optimization results a prototype of the robot was fabricated. Overall, this paper provides a novel framework for the multi-objective optimization of reconfigurable parallel robots.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565879","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