Thin-Walled Structures最新文献

{"title":"Geometrical nonlinearity infill topology optimization for porous structures using the parametric level set method","authors":"Zhen Yang ,&nbsp;Liang Gao ,&nbsp;Mi Xiao ,&nbsp;Wei Luo ,&nbsp;Xiongbing Fang ,&nbsp;Jie Gao","doi":"10.1016/j.tws.2025.113013","DOIUrl":"10.1016/j.tws.2025.113013","url":null,"abstract":"<div><div>Recently, porous structures have received a wide of attention in engineering applications, due to outstanding mechanical properties, like the lightweight, enhanced strength-to-weight ratio, and robustness in material defects. However, the study on topology optimization for infill designs in porous structures considering the geometrical nonlinearity are in limited. In the current work, the main intention is to propose a Geometrical Nonlinearity Infill Topology Optimization (GN-ITO) method for the design of porous structures to achieve superior performance that can satisfy higher engineering demands. Firstly, the Parametric Level Set Method (PLSM) with numerical stability and high effectiveness is employed, where a boundary implicit description model is used for the representation of structural topology. Secondly, the constraint strategy is constructed for controlling the generation of local structural features using a modified Heaviside function, where local volume constraints for all finite elements are aggregated by implementing an upper limitation to generate porous infill pattern in design domain. Thirdly, the finite element formulation for geometrical nonlinearity in design domain is established using the Newton-Raphson method to solve unknown structural responses, subject to the large deformation assumption. In addition, the mathematical optimization formulation for the GN-ITO is developed for implementing infill designs of porous structures, where sensitivity analysis of the objective function with respect to design variables, namely expansion coefficients, is derived using the Lagrange adjoint method. Finally, several numerical examples are tested to demonstrate the effectiveness and advantages of the proposed GN-ITO method through static analysis and comparisons of diverse design parameters.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113013"},"PeriodicalIF":5.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Natural frequencies of shear deformable porous orthotropic laminated doubly-curved shallow shells with non-uniformly distributed porosity using higher-order shear deformation theory","authors":"Ferruh Turan ,&nbsp;Ertugrul Zeren ,&nbsp;Muhammed Karadeniz ,&nbsp;Vu Ngoc Viet Hoang","doi":"10.1016/j.tws.2025.112951","DOIUrl":"10.1016/j.tws.2025.112951","url":null,"abstract":"<div><div>Porous materials, characterized by a network of voids, offer unique functional properties such as reduced density, high stiffness-to-weight and strength-to-weight ratios, and resistance to mechanical and thermal shocks. Despite their advantages, there is a lack of study on the free vibration behavior of porous laminated doubly-curved shallow shells. This study investigates the natural frequencies of porous orthotropic laminated doubly-curved shallow shells with different porosity distribution patterns. Porosity-dependent material properties are graded in the thickness direction using special cosine and sine functions. The equations of motion are established using Hamilton’s principle based on the higher-order shear deformation theory and solved by Galerkin’s method and an auxiliary function of simply supported boundary conditions to achieve natural frequency formulation. The formulation is confirmed by comparing the results with those in the existing literature, and an excellent agreement is observed. A parametric study is employed to analyze the effect of porosity coefficients, porosity distribution patterns, orthotropy, lamination sequences and orientations, shallow shell types, and geometrical characteristics on the natural frequencies of porous orthotropic laminated doubly-curved shallow shells. The results reveal that porosity distribution significantly influences dynamic behavior. Uniform porosity distribution (UDP) exhibits consistent effects across parameters, while non-uniform distributions (NUDP1, NUDP2, NUDP3) induce complex, often wavy variation, particularly in hyperbolic paraboloidal shells (HPS). Spherical shells (SS) consistently show higher natural fundamental frequencies (N-FNFs) compared to HPS, with this difference becoming more pronounced with increasing aspect ratios and diminishing orthotropy ratios. Unexpectedly, single-layered configurations in HPS sometimes exhibit higher N-FNFs than multi-layered ones, a contrast to the behavior observed in SS. Orientation angles also play a critical role, with certain ranges leading to wavy variations in N-FNFs, particularly under non-uniform porosity distributions. These findings highlight the intricate interplay between porosity, lamination, geometry, and orthotropy, offering valuable insights for optimizing porous material design in advanced engineering structures.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 112951"},"PeriodicalIF":5.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vibration reduction study of a simplified floating raft system by installing connecting nonlinear spring-mass systems","authors":"Xiaohong Mi ,&nbsp;Yuhao Zhao ,&nbsp;Qingchuan Zhan ,&nbsp;Mingfei Chen","doi":"10.1016/j.tws.2025.113015","DOIUrl":"10.1016/j.tws.2025.113015","url":null,"abstract":"<div><div>In marine engineering, some floating raft systems typically can be simplified as coupling plate structures in analyzing their vibration characteristics due to their structural characteristics, where they contain additional installation space between each sub-structure. Nonlinearities studied in the existing study can be designed as coupling elements to connect each sub-structure of the floating raft systems, which may play a positive influence on the vibration control of the floating raft systems. Against this background, this work proposes a theoretical vibration model of a simplified floating raft system (SFRS) attached to connecting nonlinear spring-mass systems (CNSMSs). Based on the correct results, vibration responses of SFRS attached to CNSMSs are studied. According to the numerical analysis, CNSMSs present multi-frequency vibration restraining characteristics, where the vibration of each subplate can be concurrently restrained by reasonably using CNSMS. Reasonable parameters of CNSMS are good for the vibration restraining of SFRS under resonance regions. Unreasonable parameters motivate complicated responses of SFRS. Furthermore, the vibration of each subplate can be concurrently restrained by reasonably using CNSMS. The introduction of CNSMSs provides a possible way to restrain the vibration of SFRS.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113015"},"PeriodicalIF":5.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonlinear milling of a flexible plate-workpiece with tool wear & process damping: Bifurcation, stability analysis, and chatter suppression via tunable vibration absorbers","authors":"Keivan Nasiri,&nbsp;Hamed Moradi","doi":"10.1016/j.tws.2025.113017","DOIUrl":"10.1016/j.tws.2025.113017","url":null,"abstract":"<div><div>This paper investigates regenerative chatter and its suppression during the peripheral milling of a flexible, thin plate-workpiece with substantial dimensions and low natural frequencies, a configuration that has not been previously analyzed. A realistic nonlinear cutting force model is proposed, and dynamic equations for a nonlinear cantilever plate are derived using von Kármán plate theory and Hamilton's principle. The coupled nonlinear delayed differential equations (NDDEs) governing the process are obtained using the Galerkin and mode summation method, incorporating tool wear and process damping. Three tunable vibration absorbers (TVAs) are designed in two planes, and stability lobes are obtained, considering the significant modes of the plate. The effects of tool location, tool wear, and process damping on the stability lobes are illustrated. Through bifurcation analyses, stable <span><math><mrow><mi>τ</mi><mo>−</mo></mrow></math></span>periodic orbits, secondary Hopf bifurcation, and transitions from stable orbits to quasi-periodic and chaotic behaviors, as well as quasi-periodic windows, are demonstrated by adjusting the axial depth of cut. Additionally, the impacts of both the cutting force's nonlinearity and the plate's nonlinearity are examined. Power spectrum responses are employed to analyze chatter frequency behavior, and the significance of higher modes at high spindle speeds is shown. Finally, TVAs are designed to suppress chatter, and optimal locations and parameter values for one and two absorbers are determined. A single absorber improves the stable axial depth of cut at low spindle speeds, while two absorbers enhance it across both low and high spindle speeds. Therefore, TVAs effectively mitigate the adverse effects of nonlinear phenomena, increasing the stable material removal rate.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113017"},"PeriodicalIF":5.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geometrically nonlinear transient response of graphene platelets reinforced metal foams arbitrary quadrilateral plates under blast load","authors":"Gui-Lin She ,&nbsp;Zhong-Shi Ma ,&nbsp;Cheng Li ,&nbsp;M.A. Eltaher","doi":"10.1016/j.tws.2025.113018","DOIUrl":"10.1016/j.tws.2025.113018","url":null,"abstract":"<div><div>Due to its geometric flexibility, the arbitrary straight-side quadrilateral plate structure is applied in various engineering practices. This article explores the nonlinear transient response of arbitrary straight-side quadrilateral plates under pulse load, in which the graphene platelets reinforced metal foams (GPLRMF) material is taken into account due to their advantages of light-weight, high-strength and long service. Firstly, considering thermal factor, the nonlinear transient response model of quadrilateral plates is established based on the first-order shear deformation theory (FSDT) and von-Kármán's nonlinearity, where the effect of viscoelastic foundation is included. Then, the irregular physical domain is transformed into a regular computational domain through the four-point mapping procedure. Subsequently, the nonlinear transient response solution of the quadrilateral plate is obtained through Galerkin discretization and Runge-Kutta method. The accuracy of the present formulation in predicting the nonlinear transient response behavior of quadrilateral plates is illustrated by the convergent analysis and comparative study. Through preliminary parametric research, the effects of material parameters, load parameters, temperature, and shape parameters on the transient response of quadrilateral plates subjected to pulse load are demonstrated.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113018"},"PeriodicalIF":5.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Auxetic effect of irregularly corrugated cores of wood-based cosinecomb panels","authors":"Jerzy Smardzewski ,&nbsp;Krzysztof W. Wojciechowski","doi":"10.1016/j.tws.2025.112989","DOIUrl":"10.1016/j.tws.2025.112989","url":null,"abstract":"<div><div>In industrial practice, it is tough to guarantee repeatable geometries of corrugated veneers with such accuracy as in metal sheets. However, this imperfection can benefit the production and properties of multi-layered cellular wood panels. So far, it has not been verified that the non-repeatability of the shape of wood-based cellular cores is auxetic and whether this disorder changes the mechanical properties and the amount of energy absorbed by the cellular panels. Therefore, the concept of combining irregular corrugated layers manufactured of veneer is proposed to construct a new type of corrugated core for studying the mechanical and energy absorption characteristics of the stiffened sandwich panels, wherein the cellular core possesses a range of negative Poisson's ratio. New wooden auxetic cosine cellular panels were manufactured, further referred to as cosinecomb ones. The research included experimental compression and bending tests, digital image analysis, and analytical and numerical calculations to determine the Poisson's ratios of the cores, the panels' mechanical properties, and their energy absorption capacity. The properties of cores and cosinecomb panels were meticulously evaluated and compared, and the results show that the experimental wave cores formed from wood veneers are auxetic structures with average negative Poisson's ratios equal -0.043 and -0.027 in XY and YX directions, respectively. The contact force, stiffness, strength, and specific absorbed energy of manufactured panels are the highest for the longitudinal orientation of the core and cladding. In this case, the largest modulus of elasticity equals 5794 MPa. The lowest modulus of elasticity 761 MPa characterized panels with perpendicular orientation of the core and cladding. The highest specific absorption energy was characterized by a beam type of <span><math><mrow><msub><mi>T</mi><mi>c</mi></msub><msub><mi>L</mi><mi>f</mi></msub></mrow></math></span> 54.4 J/kg. It has been numerically shown that for the YX direction, increasing the auxetic properties of the core raises the panel's modulus of elasticity and amount of energy absorption. In the opposite direction, XY, increasing the auxetic properties of the core raises the panel's modulus of elasticity and slightly decreases the energy absorbed. The compiled values ​​of <span><math><mrow><mi>R</mi><mover><mi>J</mi><mo>¯</mo></mover><mi>S</mi></mrow></math></span> &lt; 5 % classify the obtained panels as structures with negligible core stiffness. At the same time, this means that the samples should have significant lengths, several times longer than those used in the tests. Last but not least, it is worth to stress that the results of present studies indicate that lower values of Poisson's ratio, and therefore better auxetic properties of the panels, slightly <em>reduce</em> their elastic moduli, which is in contrast to all previous scientific reports known to the authors.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 112989"},"PeriodicalIF":5.7,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study of eccentrically loaded high-strength concrete filled circular high-strength steel tubular columns after fire exposure","authors":"Tao Du ,&nbsp;Faqi Liu ,&nbsp;Hua Yang ,&nbsp;Ying Li ,&nbsp;Yinglong Li","doi":"10.1016/j.tws.2025.113010","DOIUrl":"10.1016/j.tws.2025.113010","url":null,"abstract":"<div><div>The high-strength concrete filled high-strength steel tubular (HCFHST) column has garnered considerable attention in both engineering and academia due to its remarkable performance. Nevertheless, current research on high-strength materials revealed that the residual performance of HCFHST columns after fire exposure may be inferior to that of conventional CFST columns. In order to advance the understanding of this area, a total of 16 circular stub HCFHST specimens were subjected to ISO 834 standard fire and then tested under eccentric load after cooling down. The temperatures across the section, load-displacement curves, and load-strain curves were presented. Besides, the effect of heating duration and load eccentricity on the residual eccentric load-bearing capacities was analyzed and discussed. Further, following the determination of the cross-sectional temperature distribution using COMSOL Multiphysics, three methods were explored to predict the residual bearing capacities of the HCFHST columns. The results show the necessity of proposing more convenient and accurate calculation methods for predicting the post-fire strength of HCFHST columns.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113010"},"PeriodicalIF":5.7,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Excellent ballistic performance of B4C/shear thickening fluid (STF)/ZnO aramid composite fabric","authors":"Xu Yaojie ,&nbsp;Ma Yu ,&nbsp;Zhang Hong ,&nbsp;Huang Guangyan","doi":"10.1016/j.tws.2025.113011","DOIUrl":"10.1016/j.tws.2025.113011","url":null,"abstract":"<div><div>Aramid fabrics (such as Twaron fabric) are widely used in flexible protective equipment due to their high strength and flexibility. Recent studies have shown that growing zinc oxide (ZnO) nanoparticles on fiber surface can enhance the ballistic performance of single-layer fabrics. However, the enhancement effect on multi-layer fabrics is not ideal. This work proposes a new method of modifying aramid fabrics with Boron Carbide/STF/ZnO (BSZ). The mechanical and friction properties of BSZ modified fabrics increased first and then decreased with the increase of shear thickening fluid (STF) solid content. The thickness of BSZ fabric only increased by 6.7% compared with neat fabric. Compared with neat fabric and ZnO modified fabric, the ballistic limit velocity (<em>v</em>_bl) of single-layer BSZ fabric increased by 103.3% and 29.2%, respectively, and the areal density only increased by 7.1%. The <em>v</em>_bl of three-layer BSZ fabric increased by 77.8% and 36.4% compared with neat and ZnO modified fabric, respectively. The enhanced protection of BSZ fabric can be attributed to friction gain, mechanical interlocking, stacking effect, and stress dispersion effect of nanoparticles. The discrepancy between numerical and experimental results was within 10%. The failure characteristics of the fabric in numerical simulation was highly consistent with the results in experiment, further indicating that BSZ modification improved the ballistic performance of the fabric by enhancing the inter-yarn friction, tensile properties, and particle diversity of the fabric.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113011"},"PeriodicalIF":5.7,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Strength degradation and damage mechanism of TA1 titanium alloy clinched joints under fatigue loading” [Thin–Walled Structures 202 (2024) 112125]","authors":"Lei Lei,&nbsp;Zhiqiang Zhao,&nbsp;Ming Yan,&nbsp;Heting Qiao,&nbsp;Ye Shi,&nbsp;Chunyu Song","doi":"10.1016/j.tws.2025.112997","DOIUrl":"10.1016/j.tws.2025.112997","url":null,"abstract":"","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"208 ","pages":"Article 112997"},"PeriodicalIF":5.7,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Arresting fatigue cracks in steel plates using prestressed bonded Fe-SMA strips: Analytical prediction and experimental validation","authors":"Lingzhen Li ,&nbsp;Sizhe Wang ,&nbsp;Tao Chen ,&nbsp;Eleni Chatzi ,&nbsp;Hossein Heydarinouri ,&nbsp;Elyas Ghafoori","doi":"10.1016/j.tws.2025.112971","DOIUrl":"10.1016/j.tws.2025.112971","url":null,"abstract":"<div><div>Bonded iron-based shape memory alloy (Fe-SMA) strengthening has shown great potential in fatigue strengthening for steel structures. However, there is a lack of a comprehensive model for analysing the fatigue behaviour of systems strengthened with prestressed bonded Fe-SMA. This study proposes the first analytical model, integrating a prestress analysis and fatigue analysis, to predict fatigue crack arrest in steel plates strengthened with prestressed bonded Fe-SMA strips. Four steel plates, each featuring a central through-thickness crack, were strengthened using bonded Fe-SMA strips, and subsequently, tested under fatigue loading after generating prestress via heating and cooling. The proposed model succeeded in predicting (i) the fatigue crack arrest at certain load levels and (ii) onset of crack propagation at increased load levels.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 112971"},"PeriodicalIF":5.7,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}