Thin-Walled Structures最新文献

{"title":"Numerical calculation of high frequency induction heating for complex hull plate considering deflection","authors":"Shun Wang ,&nbsp;Zhikang Xu ,&nbsp;Zhibo Zhao ,&nbsp;Ji Wang ,&nbsp;Rui Li","doi":"10.1016/j.tws.2025.113158","DOIUrl":"10.1016/j.tws.2025.113158","url":null,"abstract":"<div><div>The traditional gas flame heating in the hull plate forming process has the disadvantages of low heating efficiency, poor repeatability. However, high frequency induction heating shows its unique advantages in the above aspects. The numerical model of high frequency induction heating for complex curved hull plate is established. Its feasibility is verified by comparing with the temperature and structural response over time in the previous research. The constraint method of the model is improved. By setting up six one-way supports, the actual forming conditions in shipyard can be simulated accurately. The model can accurately calculate the deflection. Under the correctly forming and geometric parameters of the hull plate required for simulation, the model can accurately analyze the influence of the parameters on deflection and shrinkage. Theoretical and data support are provided for hull plate high frequency induction heating automation technology. It also can provide reference for the forming of curved plates in the fields of aerospace, automobile engineering and construction.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113158"},"PeriodicalIF":5.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610716","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":"Buckling behavior and design of large-size and high-strength steel angle under combined compression and biaxial bending","authors":"Yun Sun ,&nbsp;Da Song ,&nbsp;Shuxuan Sun ,&nbsp;Yaojie Guo ,&nbsp;Quan Zhao","doi":"10.1016/j.tws.2025.113124","DOIUrl":"10.1016/j.tws.2025.113124","url":null,"abstract":"<div><div>This paper aims to investigate the behavior of large-size and high-strength steel angle (LHS) components under combined biaxial bending and axial compression. A theoretical analysis for angle sections subjected to combined action and the plastic development coefficient calculation method was performed. The behavior of 28 Q420 LHS beam-column components was tested, and the finite element model was developed and validated against the test result. The comprehensive parametric study was adopted to perform LHS beam-column components with different material grades, cross section sizes, slenderness ratios and loading eccentricities. Numerical results obtained from the parametric study were compared with the current design codes to provide accurate prediction of design strength. The research findings indicate that the angle section's elastic design approach is rather conservative, possessing a degree of plastic reserve. The eccentricity can alter the LHS beam-column components' failure mode, and the critical eccentricity characteristic becomes less apparent as the biaxial eccentricity increases. The proposed modified design formula for LHS components under combined action, can achieve reliable and accurate design predictions.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113124"},"PeriodicalIF":5.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601067","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":"A robust multi-material topology optimization method considering load and material uncertainties with univariate interpolation","authors":"Haitao Liao,&nbsp;Wenhao Yuan,&nbsp;Jing Zhang,&nbsp;Mengdi Qin,&nbsp;Yixing Huang","doi":"10.1016/j.tws.2025.113173","DOIUrl":"10.1016/j.tws.2025.113173","url":null,"abstract":"<div><div>Understanding and quantifying uncertainty factors for multi-material topology optimization (TO) are crucial to satisfy realistic engineering requirements. A robust multi-material TO method for structures with bounded load and spatially correlated material uncertainties is proposed. For the first time, a univariate interpolation framework is established to model multi-material uncertainty fields. The process begins by generating topology density fields using a univariate characteristic function, which are then filtered via convolution principle and normalized with the Heaviside function. These filtered fields are incorporated into the Discrete Material Optimization scheme to generate material property weighting functions. An uncertainty analysis model is constructed by combining weight functions with spatially varying material property field for each material using the K–L expansion method. Statistical characteristics of the displacement response are evaluated by solving the polynomial chaos expansion coefficients. A continuation strategy along with MMA is introduced to update design variables. A series of numerical examples considering load and material uncertainties are illustrated. Numerical results show that structural designs generated using the proposed method, demonstrate robustness in the face of hybrid uncertainties. Moreover, it overcomes the challenges of variable quantity dependence on material phases and non-physical material transitions in traditional methods.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113173"},"PeriodicalIF":5.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610718","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":"Application of the Finite Tube Method for the analysis of tubular members: Buckling length, signature curve","authors":"Sándor Ádány,&nbsp;Benjamin W. Schafer","doi":"10.1016/j.tws.2025.113171","DOIUrl":"10.1016/j.tws.2025.113171","url":null,"abstract":"<div><div>In this paper classical stability concepts for plated members are extended to tubular members. First, a means for determining buckling length in tubular members is introduced. Buckling length is well-known and widely used in the buckling analysis and design of columns and beams, but not generally applied in the context of tubular members. A numerical technique, based on the Finite Tube Method recently developed by the authors, is introduced. The buckling length calculation is illustrated by examples covering different load cases and boundary conditions, leading to a variety of buckling shapes. With the ability to calculate the buckling length, it is possible to establish a member's stability signature curve, (i.e., a curve determined by associated pairs of buckling lengths and critical loads as first popularized by Hancock,) similarly to those widely used in the analysis and design of cold-formed steel members nowadays. Multiple examples are shown, including members subjected to compression and torsion. Finally, the buckling length is employed to reconstruct the Koiter-circle of compressed tubular members. Taken together this work demonstrates how the Finite Tube Method can help unify our stability understanding of plated and tubular members.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113171"},"PeriodicalIF":5.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610720","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":"Behavior of GFRP suction bucket in clay under ultimate limit state","authors":"Zhao-tun An,&nbsp;Hai-lei Kou,&nbsp;Yan Sun,&nbsp;Yan-sheng Wang,&nbsp;Xi-xin Zhang,&nbsp;Jia-qing Lu,&nbsp;Guang-yuan Ma","doi":"10.1016/j.tws.2025.113139","DOIUrl":"10.1016/j.tws.2025.113139","url":null,"abstract":"<div><div>Suction buckets fabricated from glass fibre-reinforced plastic (GFRP) have emerged as alternatives to conventional steel bucket foundations for offshore wind turbines. Numerical models incorporating a GFRP damage degradation model were developed to investigate the structural response of three critical GFRP bucket sections (S1: top transition, S2: mid-skirt, S3: bottom edge) under ultimate limit states. The results indicate that mechanical changes of the bucket skirt in section S1 are minimized, while the response of section S3 is maximized under different fibre orientations (<em>f</em>) and wall thicknesses (<em>t</em>). The maximum principal stress is minimized for <em>f</em> = 45°. The maximum deformation and ellipticity of the bucket skirt are 27 mm and 0.57 %, respectively, across different fibre orientations. The maximum principal stress and maximum circumferential strain show an obvious decreasing trend as the skirt wall thickness increases. When <em>t</em> ≥ 0.6 %<em>D</em>, the gap between the stresses and strains in each section of the bucket skirt decreases significantly. For varying wall thicknesses of the bucket foundation, the maximum deformation of section S3 are approximately 5.5 times that of sections S1. When the target reliabilities are 3.71, 4.26, and 4.75, the corresponding wall thicknesses of the bucket foundations are 0.259 %<em>D</em>, 0.265 %<em>D</em>, and 0.275 %<em>D</em>.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113139"},"PeriodicalIF":5.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552245","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":"Fatigue tolerant multifunctional pentamode materials with simultaneous acoustic invisibility and vibration isolation","authors":"Aiguo Zhao ,&nbsp;Yuyang Zhu ,&nbsp;Zhaodong Lin ,&nbsp;Yu Xia ,&nbsp;Wei Yu ,&nbsp;Yiming Zhang ,&nbsp;Qiuchen Ma ,&nbsp;Xiangdong Zhang ,&nbsp;Mangong Zhang ,&nbsp;Zhigao Zhao ,&nbsp;Hong Chen ,&nbsp;Bo Song","doi":"10.1016/j.tws.2025.113174","DOIUrl":"10.1016/j.tws.2025.113174","url":null,"abstract":"<div><div>Multifunctional metamaterials with simultaneous acoustic stealth and vibration attenuation capacities are greatly needed in underwater applications. Pentamode metamaterial is firstly proposed as a novel mechanical metamaterial, whose fluid-like properties make it very promising in broadband acoustic stealth applications and are widely investigated nowadays. But the practical engineering applications of pentamode metamaterials also need to satisfy the requirements of harsh environments such as fatigue durability, environmental adaptability, etc., which are rarely reported. In this study, a novel fatigue tolerant multiphase pentamode metamaterial configuration consists of metallic lattice, additional mass blocks and interconnecting polymer materials is proposed. Taking water as the designing target, both single-phase and multiphase pentamode prototypes are designed, fabricated and experimentally verified. The two prototypes exhibit similar acoustic stealth properties, while the multiphase prototypes demonstrated superior vibration isolation performance. Moreover, the acoustic and vibration isolation performances of two fabricated samples after fatigue loading of 1000 cycles and 2000 cycles are also studied. The single-phase pentamode metamaterial prototype exhibits obvious shear band deformation under fatigue loading of 2000 cycles with a loading amplitude of 1 MPa and lead to deteriorated acoustic stealth performances. While the multiphase pentamode prototype demonstrates no obvious sign of deformation after fatigue loading of 2000 cycles under a loading amplitude of 1.5 MPa, wherein the acoustic and vibration performances are not affected. The multiphase PMs offer a new avenue to tackle the issue of durability and functional limitations of existing underwater acoustic metamaterials.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113174"},"PeriodicalIF":5.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577488","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 characteristic analysis of thin-walled conical shells with arbitrary thickness variation and general boundary condition","authors":"Dayuan Zheng","doi":"10.1016/j.tws.2025.113160","DOIUrl":"10.1016/j.tws.2025.113160","url":null,"abstract":"<div><div>A unified and efficient approach is presented in this work to analyze vibration characteristics of conical shells with arbitrary variable thickness and elastic boundary condition. The matrix equation of a conical shell system is formulated based on Love's shell theory and Rayleigh-Ritz method. General boundaries are simulated by artificial springs and vibration displacements of conical shells are constructed with a modified Fourier series where supplementary terms are used to overcome the differential discontinuity associated with boundaries. The variable thickness function of conical shells is expanded into Fourier cosine series uniformly and efficiently, and thus varying thickness information converts into Fourier coefficients immediately. The proposed procedure is verified in comparison with available results in the literature and FEM results. The methodology achieves high precision and rapid convergence using a limited number of truncated terms in the thickness function expansion and modified Fourier series representations. The influence of varying thickness and various boundary conditions on vibration characteristics of conical shells is investigated. The non-dimensional frequency parameters of conical shells with step-wise, linear, and power form thickness variation under various boundary conditions is distinct. The C-S and S-S conical shells behave in a similar manner and the same is true for the C-F and S-F conical shells during the thickness variation for higher wavenumbers. The non-dimensional frequency parameters of the C-S and S-S conical shells get closer to each other for higher wavenumbers and the similar trend applies to the C-F and S-F conical shells.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113160"},"PeriodicalIF":5.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594063","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":"Weight optimization of helicoidal composite panels with curvilinear stiffeners considering stability constraints using a semi-analytical method","authors":"Xin Lian ,&nbsp;Haotian Wei ,&nbsp;Weidong Zhang ,&nbsp;Yuming Mao ,&nbsp;Zhefeng Yu","doi":"10.1016/j.tws.2025.113142","DOIUrl":"10.1016/j.tws.2025.113142","url":null,"abstract":"<div><div>A semi-analytical method is proposed for optimizing the weight of helicoidal composite panels reinforced with curvilinear stiffeners. The need for optimization arises from the rising demand for lightweight yet structural safety designs in aerospace industries, and in these applications, conventional reinforcement approaches often lead to excessive weight or inadequate stress distribution. The plate and stiffeners are modeled using the first-order shear deformation theory, with displacement compatibility conditions ensuring their coupling. The robustness of the method is enhanced by employing Legendre polynomials as trial functions for the displacement field, while the Ritz method is employed to determine the pre-buckling and buckling responses of the structure. A comparison with FEA demonstrates the computational efficiency and accuracy of the approach, which is crucial to the entire optimization process. Aligning the stiffener paths with the out-of-plane displacement gradients of the panel provides better support in low-stiffness regions and improves stress distribution. Consequently, curvilinear stiffeners alleviate the stress concentrations, particularly along the panel edges and central regions, offering significant advantages for lightweight structural designs. The optimization reduces stiffener weight while maintaining the required buckling load capacity. Parametric analyses and case studies under uniaxial and biaxial compressive loads show that curvilinear stiffeners reduce the weight by &gt;13.49 % compared to straight stiffeners.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113142"},"PeriodicalIF":5.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644386","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":"Shear strength of beam-end bolted connections in cold-formed steel structures through experiments, numerical simulations and hybrid GPR-ECLPSO modeling","authors":"Van Thu Huynh ,&nbsp;Cao Hung Pham ,&nbsp;Viet Binh Pham ,&nbsp;Huu-Tai Thai","doi":"10.1016/j.tws.2025.113114","DOIUrl":"10.1016/j.tws.2025.113114","url":null,"abstract":"<div><div>Steel connections play a crucial role in providing links between structural elements such as beams and columns, and in maintaining the overall stability of the structural system. Accurately predicting connection behavior and strength is critical for ensuring structural safety. Bolted connections are commonly used as shear, tension or moment-resistant connections in cold-formed steel framing. Based on 35 experimental data points from an experimental program recently performed at the University of Sydney on beam-end bolted connections, finite element (FE) models are first developed using ABAQUS software and subsequently validated against the experimental results. The FE models demonstrate good agreement with the experimental data in terms of ultimate strength, load–deflection response, and failure mode. After validation, 115 additional FE models are generated in a parametric study to expand the current database. This paper consequently proposes an efficient and reliable machine learning-based framework, which integrates a Gaussian process regression (GPR) model with an enhanced comprehensive learning particle swarm optimization (ECLPSO) algorithm, referred to as hybrid GPR-ECLPSO, to predict the ultimate strength of beam-end bolted connections (asymmetric connections) in cold-formed steel channels, failing in block shear mode. A total of 150 data points, with varying characteristics, are compiled to train the GPR model, with the ECLPSO algorithm primarily adopted to determine the GPR hyperparameters. The performance of the hybrid GPR-ECLPSO is evaluated using various statistical estimators and compared with existing machine learning models (e.g., support vector machine, artificial neural network, and three typical ensemble machine learning models). All experiments, FE simulations, and machine learning results are compared against the predictions from the current design rules in the Australian/New Zealand Standard (AS/NZS 4600) and the North American Specification (AISI S100) for the design of cold-formed steel structures. The results indicate that the hybrid GPR-ECLPSO model is more accurate than other ML models, highlighting the efficiency and precision of the present work. Finally, a variance-based global sensitivity analysis, leveraging the trained GPR-ECLPSO model, is proposed to investigate the effect of input variables on the model output and identify the most significant variables.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113114"},"PeriodicalIF":5.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577489","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":"Power flow and structural intensity analyses of cracked orthotropic steel bridge decks","authors":"Xun Zhang ,&nbsp;Xing Wan ,&nbsp;Hao Li ,&nbsp;Derui Kong ,&nbsp;Cong Li ,&nbsp;Jinyi Zhao","doi":"10.1016/j.tws.2025.113161","DOIUrl":"10.1016/j.tws.2025.113161","url":null,"abstract":"<div><div>Identifying fatigue-induced structural damage and implementing effective maintenance measures can reduce damage accumulation in Orthotropic steel decks (OSDs). This study proposes a new method for fatigue damage identification in OSDs, examining power flow. An OSD's structural intensity (SI) is calculated and visualized using the finite element method and self-developed code. The effects of excitation frequency on the transmission of structural vibration power flow are analyzed. The effects of crack type, location, and length on the transmission path and distribution of structural vibration power flow are investigated. The findings demonstrated that the SI index is sensitive to minor structural damage, which is feasible for identifying fatigue damage in OSDs. The excitation frequency significantly influences the transmission path and structural vibration power flow distribution. When damage occurs, the SI of elements on the left and right sides of the crack diverges, increasing the SI at both ends. The proximity of the damage to the excitation source and the crack length contribute to the ease of damage identification. This method can be utilized in practical engineering applications to accurately locate the crack and determine its length.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"211 ","pages":"Article 113161"},"PeriodicalIF":5.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577487","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}