Forces in mechanics最新文献

{"title":"Mobile rolling robots designed to overcome obstacles: A review","authors":"","doi":"10.1016/j.finmec.2024.100283","DOIUrl":"10.1016/j.finmec.2024.100283","url":null,"abstract":"<div><p>Ground mobile robots operating in outdoor environments face multiple challenges, being overcoming obstacles on uneven terrain a prominent one. This challenging task has been addressed by numerous researchers who have developed robots employing various strategies, all aimed at efficiently overcoming increasingly higher obstacles. This article describes 108 robots designed for this purpose, incorporating the principle of rolling for locomotion and obstacle overcoming. These robots have been categorized into six major groups based on their operating principle and strategy for overcoming obstacles. After conducting a meticulous review and comparison, it has been determined that both the definition of the strategy robot will use to overcome an obstacle and the optimized robot design from the early stages of its development through clearly established requirements are the elements that hold the greatest significance in enabling a mobile robot to efficiently overcome an obstacle. In this regard, specific requirements and parameters have been identified that must be considered in the design of the robot to fulfill its purpose. Among these, key considerations include dimensional optimization, robustness, adaptability, energy efficiency, sensory capability, and appropriate navigability.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000295/pdfft?md5=d5094b4086c233db372f50678949d465&pid=1-s2.0-S2666359724000295-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142012478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling 3D finite element analysis of a semi-elliptical crack on stress corrosion cracking of API X52 pipeline","authors":"G. Terán ,&nbsp;S. Capula-Colindres ,&nbsp;J.C. Velázquez ,&nbsp;M.A. Zuñiga-Hinojosa ,&nbsp;A. Contreras","doi":"10.1016/j.finmec.2024.100279","DOIUrl":"https://doi.org/10.1016/j.finmec.2024.100279","url":null,"abstract":"<div><p>In this study, an external semi-elliptical crack was modeled in a 3D API 5 L X52 pipeline with stress corrosion cracking (SCC). To make the crack, the finite element method (FEM) was used to obtain the failure pressure (P_f) and its mechanical behavior. The longitudinal crack had a constant length (2c) and varied with depth (a). The properties of X52 steel subjected to SCC using the slow strain rate technique (SSRT) were considered. True stress-strain curves were obtained in air and in an NS4 solution with pHs of 3.5 and 9.5 at temperatures of 25 and 50 °C. According to the SCC index calculated from the mechanical properties of the SSRT, the X52 steel is susceptible to SCC at pH 3.5 and 50 °C. The mechanical properties of the tensile test using the stress-strain curves decreased as the pH and temperature changed, compared to those carried out at room temperature. This was due to the corrosion and hydrogen embrittlement produced by the solution on the X52 steel. The failure pressure is sensitive to the stress-strain curve; if the stress-strain curve decreases, the failure pressure also decreases. Corrosion defects, such as longitudinal cracks in X52 steel, which could be susceptible to SCC in an NS4 solution, decrease the failure pressure (P_f) and its capacity to withstand pressures of up to 75 % in pipe-grade steel that transports hydrocarbons.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000258/pdfft?md5=68a591603be5ba5c51d4f220fe94b92e&pid=1-s2.0-S2666359724000258-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141487332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coupled thermo-mechanical analysis of creep in a rotating FGMEE annular plate under complex thermal loading considering solar radiation, convection, and internal heat source","authors":"M. Saadatfar,&nbsp;M.A. Babazadeh,&nbsp;M. Babaelahi","doi":"10.1016/j.finmec.2024.100277","DOIUrl":"https://doi.org/10.1016/j.finmec.2024.100277","url":null,"abstract":"<div><p>In this analysis, the creep responses of a non-constant thickness annular plate was presented. The material of disc is assumed functionally graded magneto-electro-elastic (FGMEE) in which the material properties change through the radius. Also, the heat transfer coefficients for convection and conduction are functions of radius and temperature. At first, the equation of heat transfer accounting for thermal gradient, convection boundary conditions, internal heat generation, and solar radiation effects was derived. The differential transformation method (DTM) was used to solve the resulting nonlinear differential equation. The equilibrium equation for the annular plate including creep strain effects was then obtained. Ignoring creep strains, an analytical solution was obtained for the zero-time of this equation. Then, creep strains were introduced using Norton's law and the Prandtl-Reuss relations to find the stress and strain rates under fixed temperature boundary conditions. Next, the equation of strain rates including creep strains was solved analytically. Finally, an iterative approach was used to evaluate the time-dependent redistribution of creep stresses at any time point. Numerical examples highlighted the influences of key parameters like internal heat generation, convective heat transfer, grading index, solar radiation, thickness profile, and angular speed on the stresses, deformations and electric and magnetic potentials.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000234/pdfft?md5=d8e135eb3eb9ad5ba4a1741883faca93&pid=1-s2.0-S2666359724000234-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141434645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of accelerated moving load on dynamic response of FG Timoshenko nanobeam in thermal environment based on nonlocal strain gradient theory","authors":"Mohammadreza Eghbali ,&nbsp;Seyed Amirhosein Hosseini","doi":"10.1016/j.finmec.2024.100280","DOIUrl":"https://doi.org/10.1016/j.finmec.2024.100280","url":null,"abstract":"<div><p>For the first time, this paper investigates the forced vibrations of a functionally graded (FG) nanobeam with an accelerating moving load in a thermal environment. There is no exact coupling solution for the vibrations of nanobeam with an accelerated moving load, so this paper aims to provide a method to obtain an accurate solution for nanoscale structures with an accelerated moving load. The equations of motion are derived using Timoshenko's beam theory and the nonlocal strain gradient theory (NSGT). The Laplace method has been used to solve the coupling and exact differential equations. Then, by inverting Laplace from the coupled equations, an exact solution of the temporal response for FG nanobeam with constant acceleration and initial velocity in a thermal environment was obtained. The natural frequency was compared with previous works for validity and had acceptable results. Finally, the effect of parameters such as changes in acceleration and velocity of moving force, negative acceleration, power law index of FG material, different temperatures, nonlocal parameter, and longitudinal scale parameter on the maximum dynamic displacement of nanobeam is investigated. These results can be used better to design FG nanostructures with accelerated moving loads. Considering the sensitivity of data analysis in nano dimensions, it is necessary to provide an analytical solution method in these dimensions to reduce the error percentage in nano dimensions to zero. which is presented in this work for the first time.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266635972400026X/pdfft?md5=a149fd22f7686aa18120fb8677f88108&pid=1-s2.0-S266635972400026X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141434644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical behavior of X60 pipelines containing pitting corrosion defects based on finite element method","authors":"S. Capula-Colindres ,&nbsp;G. Terán ,&nbsp;J.C. Velázquez ,&nbsp;A. Caballero-Rosas ,&nbsp;E. Torres-Santillán ,&nbsp;D. Angeles-Herrera","doi":"10.1016/j.finmec.2024.100278","DOIUrl":"https://doi.org/10.1016/j.finmec.2024.100278","url":null,"abstract":"<div><p>Pitting corrosion defect is a common defect in pipelines employed in the oil and gas industry. This paper explores the mechanical behavior and failure pressure (P_f) of the pipelines, and compares the traditional empirical methods used in oil and gas pipelines with pit arrangements including an isolated pit and pitting colony (three and five pits aligned in the longitudinal direction). This study is based on nonlinear finite element method (FEM) and 3-D pipeline models. P_f was predicted by FEM and traditional methods considering the interaction of pitting corrosion defects. The pipeline P_f values obtained by FEM and methods were compared to determine similarities in applications.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000246/pdfft?md5=38a395bdb3d19f65ffab0a904353b073&pid=1-s2.0-S2666359724000246-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141422923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical-experimental study on the crashworthiness of a windshield A-pillar","authors":"Enrico Armentani ,&nbsp;Michele Perrella ,&nbsp;Massimiliano Cepollaro ,&nbsp;Fulvio Cepollaro ,&nbsp;Giuseppe D'Errico ,&nbsp;Venanzio Giannella","doi":"10.1016/j.finmec.2024.100273","DOIUrl":"10.1016/j.finmec.2024.100273","url":null,"abstract":"<div><p>This document reports a numerical and experimental crashworthiness study of a vehicle structural component. Particularly, a windshield A-pillar made of a novel high-strength steel was tested on an apparatus for impact tests that was in-house designed so as to reproduce the effects of a vehicle side impact crash. In parallel, numerical simulations were performed using the explicit finite element code LS-DYNA, considering different elastic-plastic material constitutive laws with damage. A comparison between numerical and experimental outcomes demonstrated a satisfactory correlation, with the GISSMO model that provided a good correlation and needed a relatively low computational effort.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000192/pdfft?md5=d8b7da7ae0642f974b9e888e6375db4a&pid=1-s2.0-S2666359724000192-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141024446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimal cut-off frequency and controller gain of an integrated skyhook active isolation","authors":"La Duc Viet ,&nbsp;Phan Thi Tra My ,&nbsp;Nguyen Tuan Ngoc","doi":"10.1016/j.finmec.2024.100272","DOIUrl":"10.1016/j.finmec.2024.100272","url":null,"abstract":"<div><p>Vibration isolation is a crucial technology in precision manufacturing. With the rapid development of smart sensors, smart actuators, and microprocessors, active vibration isolation has emerged as a viable approach to improve the performance of manufacturing equipment. In integrated skyhook active vibration isolation, the cut-off frequency limits the controller gain. Base on the repeated poles technique, this paper reveals the simple analytical forms of the optimal cut-off frequency and controller gain of the integrated skyhook active isolation. The analytical formula is useful in the design of active isolation. Numerical calculations are performed to show the good performance of the optimal design. An experiment is carried out to show the existence of the optimal controller gain.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000180/pdfft?md5=6d11500c8f88fc6ce7c90f9e65da521f&pid=1-s2.0-S2666359724000180-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141046249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Creep analysis of a cylinder subjected to 2D thermoelasticity loads and boundary conditions with inner heat generation source","authors":"Hamideh Seddighi ,&nbsp;Mehdi Ghannad ,&nbsp;Abbas Loghman ,&nbsp;Mohammad Zamani Nejad","doi":"10.1016/j.finmec.2024.100271","DOIUrl":"https://doi.org/10.1016/j.finmec.2024.100271","url":null,"abstract":"<div><p>This paper presents an in-depth investigation of the creep behavior of a thick-walled cylinder subjected to thermomechanical loads with internal heat generation under various boundary conditions. The cylinder is subjected to internal pressure with the incoming heat flux in the inner layer and the outgoing heat flux from the outer layer accompanied by heat generation. The displacement field follows the kinematics of the first-order shear deformation theory (FSDT). Simultaneously, the temperature field is treated as two-dimensional, exhibiting variations both along the thickness and the length of the cylinder, with a linear temperature gradient across the cylinder's thickness. Using the energy method, the equilibrium equations and general boundary conditions are derived for the cylinder. Norton's model is incorporated into rate forms of the above-mentioned equations to obtain time-dependent stress and strain results using an iterative method. The redistribution, displacements, strains and stresses over time have been obtained by the semi-analytical iteration method. Moreover, the effectiveness of the proposed method in addressing axisymmetric cylindrical shells under various boundary conditions and thermo-mechanical loading is demonstrated. A parametric study on the creep behavior has also been carried out which reveals critical insights. Notably, the study demonstrates that effective stress and radial displacement during creep can be effectively managed by optimizing the external cooling profile or the internal heating profile. Furthermore, the investigation reveals that the presence of a heat source markedly influences the effective stress and displacement within structure, highlighting the interplay between thermal and mechanical factors in determining the structural integrity. To validate the findings of this study, the finite element method was employed, with the results indicating good agreement between the two approaches.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000179/pdfft?md5=c127c1785e5055daace7ea1ef907f986&pid=1-s2.0-S2666359724000179-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140950884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling and simulation of ceramic tiles linear shrinkage variation during the sintering process","authors":"J.M.N. Jayaweera ,&nbsp;M. Narayana ,&nbsp;S.U. Adikary","doi":"10.1016/j.finmec.2024.100274","DOIUrl":"https://doi.org/10.1016/j.finmec.2024.100274","url":null,"abstract":"<div><p>Linear shrinkage (S_L) is utilized as a criterion to modify the size of the sintered ceramic tiles, and the sintering cycle affects the shrinkage variation. The exact sintering cycle associated with the S_L of ceramic tiles is difficult to verify experimentally, and it affects the quality of the final ceramic tiles. Production costs also increased due to the large amount of experimental work. This study investigated a powerful numeric model of the sintering process within ceramic tile, using computational fluid dynamics (CFD) to evaluate the variation of the S_L in ceramic tiles during the sintering process. The sintering process was simultaneous and integrated with energy and mass transport phenomena. Numerical formulas were developed for the sintering operation, and the S_L behavior of ceramic tiles during sintering was examined using a kinetic model. An unsteady 3D model was established, and simulation was performed using the CFD tool by varying the temperature profile. The results of CFD simulation can ascertain the temporal and spatial changes in the S_L of ceramic tiles through sintering. To validate the model, the green body mixture of ceramic tile was prepared and analyzed. Ceramic tiles were shaped by a powder pressing technique on a laboratory scale. Dried tiles were sintered in a laboratory furnace by adjusting the maximum sintering temperatures. The structure of sintered ceramic tiles was analyzed. The S_L variation of each sintered tile was determined and compared with the results of CFD simulations. The results of the CFD simulation were validated and concurred with experimental outcomes, and the R² value of the results was 0.9. The developed CFD model is capable of predicting the temporal and spatial changes in S_L of ceramic tiles through sintering, and it is a great help to find the exact sintering cycle associated with S_L. Finally, the quality of the tile is increased, and production costs are also reduced.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000209/pdfft?md5=8bc087aeaa7b1ed23332480e9ee638cd&pid=1-s2.0-S2666359724000209-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141249518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamics of tri-hybridized Prandtl-Eyring thermal water-based magneto-nanofuids flow over double stretched wedge sheets experiencing force convection","authors":"S.O. Salawu ,&nbsp;T.A. Yusuf ,&nbsp;E.O. Fatunmbi ,&nbsp;A.M. Obalalu","doi":"10.1016/j.finmec.2024.100270","DOIUrl":"https://doi.org/10.1016/j.finmec.2024.100270","url":null,"abstract":"<div><p>The management of thermal propagation and preservation of heat energy are major challenges facing the industry and thermal science in recent times. Various studies have arisen on nanoparticles of different volume fraction for an enhanced heat transfer. Thus, limited reports have been offered on the dispersion of titanium dioxide <span><math><mrow><mi>T</mi><mi>i</mi><msub><mi>O</mi><mn>2</mn></msub></mrow></math></span>, cylindrical magnesium oxide <span><math><mrow><mi>M</mi><mi>g</mi><mi>O</mi></mrow></math></span> and platelet aluminum <span><math><mrow><mi>A</mi><mi>l</mi></mrow></math></span> nanoparticles in Prandtl-Eyring thermal water-based at different temperature experiencing force convection. Meanwhile, these nanoparticles’ hybridization served has essential materials to boost heat transfer for an improved industrial output and thermal engineering device. Hence, a partial derivative mathematical model is developed for the considered thermal fluid flow in dual wedge stretching sheets. An invariant transformed model is obtained via similarity variables, and a spectral quasi-linearization scheme solves the model. The results in tables and graphs are justified by validating with the existing ones and quantitatively discussed. It is seen with <span><math><mrow><msup><mn>20</mn><mn>0</mn></msup><mi>C</mi></mrow></math></span> at low and high-volume fraction (0.1 and 0.8), the ternary hybridized thermal gradient for unsteadiness decreases at 0.20 rate and increases at 0.07 rate respectively. Also, the heat transfer is strengthened with a rising induced magnetic field.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000167/pdfft?md5=bd01c87ec537063bf8b4df002c524cf9&pid=1-s2.0-S2666359724000167-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140622176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}