Thin-Walled Structures最新文献

{"title":"Distortion warping displacement pattern of thin-walled box girders under the influence of non-uniform shear deformation and its corresponding beam-type finite element model","authors":"Maoding Zhou ,&nbsp;Yuanhai Zhang ,&nbsp;Kui Luo","doi":"10.1016/j.tws.2025.113108","DOIUrl":"10.1016/j.tws.2025.113108","url":null,"abstract":"<div><div>This study proposes a method for the distortion analysis of thin-walled box girders considering the influence of non-uniform shear deformation of each box-wall slab. Firstly, the distribution pattern of distortion shear flow across the cross-section is derived using the principles of stress equilibrium in micro-elements and the torsional self-balancing condition of the box girder cross-section. Then, by introducing the generalized displacement of shear distortion, according to the deformation continuity and internal force self-balancing conditions of the box girder cross-section, a theoretically sound and practical distribution function for the distortion and warping displacement of thin-walled box girders, accounting for the impact of non-uniform shear deformation is proposed. The governing differential equation for distortion is established through the principle of minimum potential energy. A practical 1D beam-type finite element model for box girder distortion analysis is then proposed, employing the Hermite interpolation function. The reliability and accuracy of this model are verified through a series of numerical examples involving different types of box girders. The results demonstrate that the in-plane and out-of-plane distortion warping stresses of the box-wall slabs, when considering non-uniform shear deformation, align well with measured values and three-dimensional finite element results. Notably, shear deformation significantly impacts the distortion effect of the top flange in box girders. Ignoring the influence of non-uniform shear deformation may lead to an underestimating the distortion warping stresses at critical cross-sections of box girder bridges. The research findings provide an effective means for the improved analysis of box girder distortion.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113108"},"PeriodicalIF":5.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143518861","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":"Stochastic response and flutter analysis of the thrust-vectoring nozzle sidewall coupling plate under aerothermal loading","authors":"Hui Dong ,&nbsp;Rui Zhong ,&nbsp;Qingshan Wang ,&nbsp;Long Yu","doi":"10.1016/j.tws.2025.113132","DOIUrl":"10.1016/j.tws.2025.113132","url":null,"abstract":"<div><div>The thrust-vectoring nozzle sidewall coupled plate, composted of laminated composites with layer arrangements, is an important part of the tail section of the jet fighter's nozzle, and is constantly subjected to aerodynamic and thermal loads during operation. This paper investigates the modal characteristics, stochastic response characteristics, and flutter phenomenon of the thrust-vectoring nozzle sidewall coupled plate under aerothermal loading. The equations of the thrust-vectoring nozzle sidewall coupled plate are derived and solved by combining the supersonic piston theory and the Mindlin plate theory. Each displacement of the plate is represented by the first-class Chebyshev polynomial. Artificial spring is used to simulate the boundary and coupled conditions. The trapezoidal and triangular plates are mapped to a regular region by coordinate transformation for integral solution. The results obtained from this method are in good agreement with those from the finite elements and literature, verifying its accuracy and efficiency. In addition, the effects of relevant parameters on the flutter boundary and stochastic response process of the thrust-vectoring nozzle sidewall coupled plate are analyzed.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113132"},"PeriodicalIF":5.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577486","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":"Evolutions of the vibration modes of rotating thin-walled cylindrical shell under connection bolts loosening","authors":"Jiucun Wei,&nbsp;Zhiguang Song","doi":"10.1016/j.tws.2025.113119","DOIUrl":"10.1016/j.tws.2025.113119","url":null,"abstract":"<div><div>Rotation cylindrical shells are common structures in aerospace engineering. They are always connected to the transmission system with bolts. Under high-speed rotation, bolts are prone to loosening. Therefore, it is necessary to study the vibration behaviors of the rotating cylindrical shell under the condition of bolts loosening. In this paper, mode localization behaviors of the rotating cylindrical shell under connection bolts loosening are investigated. Hamilton's principle and an extend assumed mode method are used to formulate the equation of motion. Bolts are simulated with artificial springs, and the mode functions of cylindrical shell with free boundary conditions are derived by using Rayleigh-Ritz method. The gyro term is obtained, and the traveling wave solution of the rotating structures is explained. Four typical bolt loosening types are analyzed, and the mode localization caused by local bolt loosening is found and verified by the experiment. The generation mechanism of mode localization is revealed, and the influence of the number of loose bolts on the degree of mode localization is quantitatively analyzed by introducing the modal confidence criterion. The evolution of the mode localization shape of cylindrical shell with rotating speed and its influence on the critical speed under different bolt loosening boundary conditions are analyzed.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113119"},"PeriodicalIF":5.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686670","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":"Extension of GBT to the buckling analysis of tapered regular convex polygonal tubes","authors":"Rodrigo Gonçalves","doi":"10.1016/j.tws.2025.113101","DOIUrl":"10.1016/j.tws.2025.113101","url":null,"abstract":"<div><div>This paper extends the first-order Generalized Beam Theory (GBT) formulation for tapered regular convex polygonal tubes, recently developed by the author (Gonçalves, 2025), to the buckling (linear stability analysis) case. The proposed extension allows calculating global-distortional-local bifurcation loads and buckling modes with great accuracy and a very low computational cost, even for high taper angles, due to the fact that it inherits the key features of its first-order counterpart: (i) it uses the GBT deformation modes of the prismatic case, which have a clear physical meaning, (ii) no additional simplifications are introduced, even though the member is genuinely tapered, and (iii) the optional membrane strain assumptions of the prismatic GBT are satisfied exactly. Naturally, the proposed extension retains the unique GBT modal decomposition features, which allow a straightforward classification of the buckling mode nature (global, distortional and local). Even though the proposed formulation is necessarily complex, due to the tapered geometry, all expressions required to implement a suitable displacement-based finite element are provided in a simple vector–matrix format. The computational efficiency of the element is shown in several numerical examples, where results obtained with refined shell finite element meshes are reported for comparison purposes.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113101"},"PeriodicalIF":5.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534961","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":"Thermal distortion evolution and residual stress characteristics of Ti-6Al-4 V alloy by laser-directed energy deposition: In-situ monitoring, contour method, and XRD","authors":"Ruixin Wang ,&nbsp;Chaoyue Chen ,&nbsp;Tingwei Cao ,&nbsp;Ruixin Zhao ,&nbsp;Yuyang Hou ,&nbsp;Songzhe Xu ,&nbsp;Tao Hu ,&nbsp;Xia Li ,&nbsp;Wenjun Zhao ,&nbsp;Gang Ji ,&nbsp;Ninshu Ma ,&nbsp;Jiang Wang ,&nbsp;Zhongming Ren","doi":"10.1016/j.tws.2025.113131","DOIUrl":"10.1016/j.tws.2025.113131","url":null,"abstract":"<div><div>Thermal distortion and residual stress are major issues affecting dimensional accuracy and mechanical properties in laser additive manufacturing (LAM). This study investigates the evolution of thermal distortion and the formation mechanism of residual stress in Ti-6Al-4V alloy during laser-directed energy deposition (L-DED). An in-situ monitoring system recorded the distortion and temperature histories of the sample during deposition. Residual stress in various regions and directions of the final thin-wall was analyzed using the contour method and XRD. The results show that during each layer deposition, the interaction between tensile and compressive stresses causes the free end of the substrate to initially bend downward and subsequently upward. Different linear energy densities (<em>E_l</em>) lead to varying distortion modes of the substrate. For <em>E_l</em> values between 75 and 150 J/mm, substrate distortion height increases with deposition layers. For <em>E_l</em> values between 150 and 300 J/mm, it first increases and then decreases. By combining in-situ monitoring data with residual stress results, this study clarifies the evolution of thermal distortion, the mechanism of residual stress formation, and their relationship during l-DED. Samples with greater distortion tend to exhibit lower residual stress. The distortion of <em>E_high</em> samples is 0.73 mm greater than that of <em>E_low</em> samples, yet their maximum residual stress is 82.8 MPa lower. The higher cooling rate in the deposition region creates local tensile stress, while compressive stress forms in the surrounding region. As deposition progresses, the region of maximum tensile stress shifts upward along the building direction until complete. This study provides new insights into the evolution of thermal distortion and the mechanisms of residual stress formation in LAM, contributing to the control and reduction of residual stress.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113131"},"PeriodicalIF":5.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526924","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":"Experimental study on cyclic tensile-compressive behavior of concrete-filled steel tube column for offshore wind turbine jacket structure","authors":"Xiao-Yi Qiu ,&nbsp;Xu-Hong Zhou ,&nbsp;Shan Gao ,&nbsp;Bin Wang ,&nbsp;Wei Ren ,&nbsp;Yu-Hang Wang","doi":"10.1016/j.tws.2025.113130","DOIUrl":"10.1016/j.tws.2025.113130","url":null,"abstract":"<div><div>Under the coupling effect of wind load and wave load, the corner columns of the offshore wind turbine concrete-filled steel tube(CFST) jacket structure will undergo cyclic tension and compression. The alteration of concrete crack surface contact and the support provided by the filled concrete to the steel tube have resulted in the absence of a precise model capable of accurately describing the behavior of CFST columns under cyclic tensile-compressive loads with different loading paths. Therefore, cyclic tensile-compressive load tests were conducted on a total of 9 specimens under 5 different loading schemes, considering the effects of load amplitude, load level, and number of cycles. The failure modes of the specimens under cyclic tensile-compressive loads were obtained. Analysis of the experimental results revealed that the ultimate capacity and ductility are slightly influenced by the loading schemes. The ultimate capacity is positively correlated with the load level, whereas ductility exhibits a negative correlation with the load level, with ductility being more significantly affected. Additionally, the compressive stiffness of the specimens is notably influenced by the loading schemes; higher load levels result in more pronounced stiffness degradation, with compression having a greater impact than tension. Finally, several existing methods were adopted to predict the ultimate compressive and tensile capacity. The results showed the measured tensile ultimate capacity aligns closely with the measured results, whereas the compressive ultimate capacities are consistently underestimated.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113130"},"PeriodicalIF":5.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552257","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":"Investigation of crack propagation characteristics in clinched joints under different failure modes","authors":"Yan Lu ,&nbsp;Yanghu Hu ,&nbsp;Chao Chen","doi":"10.1016/j.tws.2025.113129","DOIUrl":"10.1016/j.tws.2025.113129","url":null,"abstract":"<div><div>This study successfully simulated fatigue crack propagation paths and predicted the fatigue life of 6063-T6 aluminum alloy under different failure modes. A finite element model for fatigue crack propagation in 6063-T6 aluminum alloy clinched joints was developed using the ABAQUS-FRANC3D interaction method. Based on linear elastic fracture mechanics theory, the model employs the M-integral to calculate the stress intensity factor at the crack tip. The crack propagation direction is accurately predicted through analysis of the crack tip stress field and stress intensity factor variations. The results demonstrate distinct crack initiation mechanisms for different failure modes. In necking fracture mode, crack initiation occurs through the accumulation of fatigue slip bands, with crack propagation direction influenced by shear stress orientation. In lower sheet fracture mode, crack initiation is caused by oxide formation due to fretting wear between sheets, with crack propagation direction perpendicular to the shear stress orientation. The model demonstrates reliable accuracy in fatigue life prediction, offering valuable insights for structural safety assessment and remaining life evaluation in engineering applications.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113129"},"PeriodicalIF":5.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579136","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":"Bending performance and failure mode of circular hollow section TT-joint connected to ring plates","authors":"Chongkai Fan,&nbsp;Wanzhi Zhou,&nbsp;Tong Wu,&nbsp;Dachang Zhang,&nbsp;Fenghua Huang","doi":"10.1016/j.tws.2025.113133","DOIUrl":"10.1016/j.tws.2025.113133","url":null,"abstract":"<div><div>This study focuses on the bending performance of an innovative circular hollow section (CHS) TT-joint connected to ring plates, including the bearing capacity and failure modes. TT-joint specimens with different extended ring-plate widths were designed and tested, and the failure mechanism of the TT-joint was studied from different perspectives, including the failure mode, load displacement, and stress development. A finite element model validated through tests was established, and further 166 finite element models based on dimensionless parameters was carried out, including the diameter-to-thickness ratio of the chord (<em>γ</em>), diameter ratio of the brace to the chord (<em>β</em>), thickness ratio of the brace to the chord (<em>τ</em>₁), thickness ratio of the ring plate to the chord (<em>τ</em>₂), width to thickness ratio of the ring plate (<em>λ</em>), and angle of the braces (<em>θ</em>). The results reveal three typical failure modes of the TT-joints connected to the ring plate with the change in component dimensions, including bulging failure of the chord, buckling failure of the brace, and buckling failure of the ring plate. When the two braces are subjected to uneven loads, the TT-joints are more prone to buckling failure of the brace. All parameters will affect the failure mode of the TT-joints, and the ultimate bearing capacity of the joints decreases as <em>γ</em> increases, and the ultimate bearing capacity of the joints increases with <em>β, τ</em>₁, <em>τ</em>₂, and <em>θ</em>. The parameter <em>λ</em> primarily affects the failure mode and yield bearing capacity of TT-joints and has almost no effect on the ultimate bearing capacity. Finally, a calculation method for the bending capacity of TT-joints was proposed based on the failure mode.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113133"},"PeriodicalIF":5.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593967","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":"Scanning vertical and flexural-torsional frequencies of thin-walled girder bridges using a two-axle vehicle and a signal enhancement approach","authors":"Xueqi Li ,&nbsp;Yong Cai ,&nbsp;Xiaoyong Lv ,&nbsp;Haijun Chen","doi":"10.1016/j.tws.2025.113116","DOIUrl":"10.1016/j.tws.2025.113116","url":null,"abstract":"<div><div>In research on using vehicles to extract bridge frequencies, single degree-of-freedom vehicles and two-dimensional bridges cannot fully simulate vehicle-bridge interaction and bridge frequency extraction. Therefore, a method of using two-axle vehicles to extract the vertical and flexural-torsional frequencies of three-dimensional (3D) bridges is proposed. First, the feasibility of this method is theoretically verified by analytical methods. Subsequently, a signal enhancement approach, combining successive variational mode decomposition (SVMD) and a designed window function, is proposed. SVMD performs modal decomposition on vehicle signals, while the window function reduces noise in vehicle signals and enhances bridge signals, resulting in a low-noise spectrum. The investigations indicate that bridge frequencies extracted by the proposed method exhibit a relative error of &lt;5 %, which meets engineering requirements. Moreover, the method is insensitive to vehicle parameters and is not limited by two-axle vehicle types. Notably, vertical acceleration spectra of two-axle vehicles, filtered using the signal enhancement approach, can resist the effect of road roughness noise on bridge frequency identification. This study further advances the vehicle scanning method and offers a practical approach to bridge health monitoring.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113116"},"PeriodicalIF":5.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552240","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":"Performance comparison of Zn, Zn-Al and Zn-Al-Mg coatings on the corrosion resistance of galvanized steel joints bonded using a hot-curing epoxy adhesive","authors":"Fengzhen Sun ,&nbsp;Ruitong Shi ,&nbsp;Shuangshuang Li ,&nbsp;Yanliang Zhao ,&nbsp;Junying Min","doi":"10.1016/j.tws.2025.113128","DOIUrl":"10.1016/j.tws.2025.113128","url":null,"abstract":"<div><div>The composition of galvanized coating has significant effects on the surface morphology and corrosion behavior of galvanized steel, which in turn influences the mechanical property and the corrosion resistance of adhesive-steel interface. In this study, the influences of three galvanized coatings, i.e., the Zn, Zn-Al and Zn-Al-Mg coatings, on the degradation of galvanized steel joints bonded using Henkel EP 5089 adhesive under typical corrosive environments were investigated. Surface morphology, coating thickness and chemical composition after corrosion was analyzed to explore the corrosion behavior of different adhesive-steel interfaces. The results showed that the bonding interface of adhesive joint coated with Zn-Al-Mg exhibited higher corrosion resistance under three typical exposure environments. It also suggested that the adhesive joints of Zn, Zn-Al and Zn-Al-Mg coated steel failed very differently under aggressive corrosive environment. The adhesive joints made of Zn and Zn-Al coated steel tended to fail in the form of coating detachment due to the severe corrosion in the coatings, whilst the joints coated with Zn-Al-Mg failed at the adhesive-steel interface where localized corrosion occurred.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113128"},"PeriodicalIF":5.7,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552242","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}