Forces in mechanics最新文献

{"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}

{"title":"Manufacturing, characterization, and macromechanical modeling of short flax/hemp fiber-hybrid reinforced polypropylene","authors":"Bilel Miled ,&nbsp;Slim Kammoun ,&nbsp;Imane Belyamani ,&nbsp;Laurent Cauret","doi":"10.1016/j.finmec.2024.100269","DOIUrl":"https://doi.org/10.1016/j.finmec.2024.100269","url":null,"abstract":"<div><p>The present work focuses on the manufacturing, mechanical characterization, and modeling of hybrid Flax/Hemp/Polypropylene (PP) composites under dry conditions. Geometric parameters of the fibers were measured both before and after the melt processing. The results indicated that the processed fibers, especially the hybrid ones, had a narrowed length distribution with an average fiber length of 0.48 mm for hybrids compared to 0.62 mm for non-hybrids. The hybrid composites were mechanically characterized using basic and loading-unloading tensile tests with various fiber combinations and weight percentages. The study also examined the effect of strain rate and cutting angle on the behaviors of the composites. The results demonstrated the significance of fiber orientation as the primary factor in explaining mechanical variations. The tensile strength and Young's Modulus of FH30 composites (PP + 15 wt% flax + 15 wt% hemp) increased by about 24.1 % and 10.9 %, respectively, when the plates were cut into dumbbell shapes at a 90° angle to the injection molding flow direction, compared to a cut at 0° The study also showed that the tensile strength is directly proportional to the mass fraction of reinforcements, with an increase in tensile strength by 7.9 % for 0° cut angle specimens between FH10 (PP + 5 wt% flax + 5 wt% hemp) and FH30 bio-composites, while the uniform strain is inversely proportional to the mass fraction of reinforcements, evidenced by a reduction in uniform strain of 30 % between FH10 and FH30 samples. Morphological observations revealed the presence of bands indicating the propagation of micro-cracks, as well as debonding or cohesive failure. Finally, a Perzyna-type elasto-viscoplastic constitutive model was applied to accurately predict the overall mechanical response of a hybrid composite material. Specifically, the model successfully captured the tension deformation behavior of hybrid natural short-fiber thermoplastic composites, including the elastic stage, yield stress, and nonlinear hardening.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000155/pdfft?md5=91460378238bda1a9ad54c3686740f46&pid=1-s2.0-S2666359724000155-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140557393","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":"High velocity steel spheres impact and damage analysis of graphene doped T700 composite shielding panels","authors":"Nelson Matos ,&nbsp;Virginia Infante ,&nbsp;Manuel Gomes ,&nbsp;Mario Ribeiro ,&nbsp;José Pedro Sousa ,&nbsp;Filipe Ribeiro ,&nbsp;Ricardo Rocha","doi":"10.1016/j.finmec.2024.100268","DOIUrl":"https://doi.org/10.1016/j.finmec.2024.100268","url":null,"abstract":"<div><p>Composite materials are increasingly being used in aircraft components such as fuselage panels which are subject to collision with debris during take-off/landing or in flight. This article provides an analysis of the impact resistance capability of graphene doped T700 (T700G) multilayer composite, when subjected to steel projectile impacts. Test coupons with 300×300 mm were impacted by steel spherical projectiles, with impact energies ranging from 34 J to 338 J, using a compressed air operated cannon. Test data, such as impact and absorbed energy were determined through impact and residual projectile velocity, acquired using ballistic chronograph and two high speed cameras. Damage assessment was performed using non-destructive techniques such as Ultrasonic testing before and after impact test. Through modelling and simulation, using ABAQUS/Explicit, and recording the change of projectile velocity, the energy loss of projectile is calculated, and the impact resistance is judged together with damage extent. T700G has similar impact resistance to AL2024, underperforming when impacted by larger projectiles and presenting an overall higher damaged area.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000143/pdfft?md5=b5f225309d27f6948ef187dcaf561ab0&pid=1-s2.0-S2666359724000143-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140533409","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":"Modelling and optimization of hybrid Kevlar/glass fabric reinforced polymer composites for low-velocity impact resistant applications","authors":"T. Jambhulkar,&nbsp;R.K. Sahu","doi":"10.1016/j.finmec.2024.100267","DOIUrl":"https://doi.org/10.1016/j.finmec.2024.100267","url":null,"abstract":"<div><p>Kevlar and glass-based fabric-reinforced polymer composites possess excellent impact resistance, corrosion and high specific strength properties which makes them suitable candidature for the fabrication of industrial helmets, riot shields, automobile parts etc. The polymer composite components are prone to impact failure, which restricts their wide commercial usage. In this work, to enhance the impact damage resistance of polymer composite laminates, a hybridized material model consisting of glass and Kevlar fabric was employed. The hybridization of Kevlar ‘K’ with glass ‘G’ fabric [K/K/G/G/K] results in a cost reduction of 32 % without any significant variation in performance when compared to non-hybrid Kevlar fabric-based composite laminate [K/K/K/K/K]. In comparison to plain glass fabric laminates [G/G/G/G/G], the [K/K/G/G/K] configuration exhibits a significant 16.68 % improvement in energy absorption. This improvement is rooted in a parametric study and optimization process employing the Preference Selection Index (PSI) technique to determine the optimum stacking sequence of fabrics within the composite laminate. In addition, it evaluates the projectile limit velocity necessary to prevent failure and assesses the total deformation for an optimized stacked [K/K/G/G/K] composite, taking into account various projectile shapes conforming to low-velocity impact applications. The results of this study provide valuable insights into the properties and capabilities of the hybrid composite laminate and may pave the way for the development of more effective materials for impact protection in various applications.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666359724000131/pdfft?md5=9377346645417d3ce460074e5065b5b3&pid=1-s2.0-S2666359724000131-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140342525","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":"Assessing lateral torsional buckling of stepped steel I beams using finite element method","authors":"Amin H. Almasri ,&nbsp;Israa Jabur","doi":"10.1016/j.finmec.2024.100266","DOIUrl":"10.1016/j.finmec.2024.100266","url":null,"abstract":"<div><p>The use of steel beams with variable sections along their length is getting more attention in recent years. These variable sections can vary gradually along the beam or change abruptly as a drop or a step. The current study investigates the lateral torsional buckling (LTB) of stepped steel beams with flanged I section subjected to uniformly distributed pressure on the top flange. The studied parameters are the step height, the step length, and the boundary conditions of the beam. The finite element method is used to carry out a linear buckling analysis of the beams’ models. The results show significant degradation in beams LTB strength due to the jump of the beam's section. Reducing the simply supported beam depth by 25 % reduces LTB strength by about 40–50 %, while reducing the fixed beam depth by 25 % reduces LTB strength by about 30–40 %. Further reduction in depth showed no significant additional reduction in simply supported beams strength, while the fixed beams showed another 30–40 % reduction in strength with another 25 % reduction in beam total depth. The step made the compressive stress transfer between the two flange parts through the web.</p></div>","PeriodicalId":93433,"journal":{"name":"Forces in mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266635972400012X/pdfft?md5=4e0289ef679000ae893eb47c759e2c59&pid=1-s2.0-S266635972400012X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140281253","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}