Thin-Walled Structures最新文献_第9页

Cold-formed steel octagonal hollow section (OctHS) beam-columns: Numerical studies and design recommendations 冷弯型钢八角空心截面（OctHS）梁柱：数值研究和设计建议

IF 6.6 1区工程技术

Thin-Walled Structures Pub Date : 2025-09-09 DOI: 10.1016/j.tws.2025.113963

Haixin Liu , Jiong-Yi Zhu , Junbo Chen , Tak-Ming Chan

{"title":"Cold-formed steel octagonal hollow section (OctHS) beam-columns: Numerical studies and design recommendations","authors":"Haixin Liu , Jiong-Yi Zhu , Junbo Chen , Tak-Ming Chan","doi":"10.1016/j.tws.2025.113963","DOIUrl":"10.1016/j.tws.2025.113963","url":null,"abstract":"<div><div>This paper first proposes a generalised finite element modelling (FEM) methodology for cold-formed steel tubular beam-columns considering the material variation, initial geometric imperfection, and boundary condition. The proposed FE model is proven to be capable of accurately replicating the structural behaviour of cold-formed steel rectangular hollow section and circular hollow section beam-columns regarding the obtained ultimate strengths and axial load versus mid-height lateral deflection curves. Following the successful validation of generalised FEM methodology, this methodology is extended to the numerical modelling of the cold-formed steel octagonal hollow section beam-column. A total of 5246 numerical models of the OctHS beam-column covering a broad spectrum of steel grades, geometric profiles, and loading eccentricities are subsequently generated to form an essential database. Based on the evaluation of numerical results, design recommendations and modifications to the current standards for structural steel design have been proposed to improve the prediction accuracy. Corresponding reliability analyses following different evaluation procedures are also performed, and the reliability analysis results indicate the effectiveness of the design recommendation and modification.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 113963"},"PeriodicalIF":6.6,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097522","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}

引用次数: 0

Dynamic modelling and vibration behavior of axially moving honeycomb sandwich plates immersed in fluid 轴向移动蜂窝夹层板浸入流体的动力学建模与振动特性

IF 6.6 1区工程技术

Thin-Walled Structures Pub Date : 2025-09-09 DOI: 10.1016/j.tws.2025.113967

Tianhao Yang, Kai Zhou, Yake Li, Dao Gong, Jinsong Zhou, Leibin Wen

{"title":"Dynamic modelling and vibration behavior of axially moving honeycomb sandwich plates immersed in fluid","authors":"Tianhao Yang, Kai Zhou, Yake Li, Dao Gong, Jinsong Zhou, Leibin Wen","doi":"10.1016/j.tws.2025.113967","DOIUrl":"10.1016/j.tws.2025.113967","url":null,"abstract":"<div><div>An energy-based analytical method is proposed to describe the vibration and stability behaviors of axially moving HSTP immersed in fluid under general boundary conditions. General boundary conditions, such as simply supported, clamped and free constraints, can be considered by different penalty parameter values. The proposed method systematically accounts for the influence of the geometric parameters of the honeycomb core and the fluid on the model. By integrating first-order shear deformation theory (FSDT) with linear potential flow theory, the energy functional formulations for the structure considered are meticulously derived. The Hamilton’s principle is applied to formulate the governing equations for the axially moving HSTP immersed in fluid, and a unified analytical solution for the cases with general boundary conditions is derived. The accuracy of the presented method is validated through comparisons with commercial software results and published reference data. Furthermore, parametric analyses are carried out to evaluate how key parameters including axially moving velocity, fluid density, face sheet thickness, core wall dimensions, core height, unit cell geometry and structural damping coefficient influence the dynamic behavior of the HSTP. Numerical results demonstrate that these parameters significantly affect the stability and vibration behavior of the HSTP in fluid environments. The findings of this research can serve as a theoretical foundation for the dynamic optimization design of HSTP structures immersed in fluid environments.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 113967"},"PeriodicalIF":6.6,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049831","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}

引用次数: 0

Smooth reconstruction of blade profile from data points and its characterization 基于数据点的叶片型线平滑重构及其特征

IF 6.6 1区工程技术

Thin-Walled Structures Pub Date : 2025-09-08 DOI: 10.1016/j.tws.2025.113846

Kadir Kiran

{"title":"Smooth reconstruction of blade profile from data points and its characterization","authors":"Kadir Kiran","doi":"10.1016/j.tws.2025.113846","DOIUrl":"10.1016/j.tws.2025.113846","url":null,"abstract":"<div><div>In the current paper, reconstruction and characterization procedures for the blade profile data points are comprehensively presented. For the reconstruction, a single <span><math><msup><mrow><mi>C</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span>-continuous fair Bezier curve fitting algorithm is developed. This algorithm is based on the nonlinear least squares fitting method and it performs fitting and fairing processes concurrently, which eliminates the need for post processing of the reconstructed blade profile. Thus, we are able to accurately represent large number of blade profile data points with maximum 14 control points of a Bezier curve. On the other hand, in the characterization procedure, the reconstructed blade profile camber line, radius distribution and fundamental design parameters (i.e., inlet metal, outlet metal and stagger angles, and chord length) are computed. The implementations and validations of the proposed procedures are completed with data points of various reference blade and airfoil profiles, and a worn aero-engine blade profile data points achieved via a coordinate measuring machine (CMM). The results have shown that the proposed procedures along with their algorithms are quite successful, practical, and powerful for the blade profile reconstruction and characterization. They have great potential as useful tools for the design, analysis, optimization, inspection, and manufacturing of the blades.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 113846"},"PeriodicalIF":6.6,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145027461","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}

引用次数: 0

Experimental and numerical investigation of vibration characteristics of X-frame CFRP sandwich plates x -框架CFRP夹芯板振动特性试验与数值研究

IF 6.6 1区工程技术

Thin-Walled Structures Pub Date : 2025-09-08 DOI: 10.1016/j.tws.2025.113942

Min Tang , Longjun Chen , Weimin Jiang , Zhikang Liu , Jiayi Liu , Wei Huang

{"title":"Experimental and numerical investigation of vibration characteristics of X-frame CFRP sandwich plates","authors":"Min Tang , Longjun Chen , Weimin Jiang , Zhikang Liu , Jiayi Liu , Wei Huang","doi":"10.1016/j.tws.2025.113942","DOIUrl":"10.1016/j.tws.2025.113942","url":null,"abstract":"<div><div>The vibration performance of the X-frame carbon fiber reinforced polymer (CFRP) sandwich plates was studied by experiments and simulations in this paper. The research focused on the influences of foam filling, relative density (RD) and designed parameters of the core on the modal characteristic and surface mean quadratic velocity of the plates. Firstly, the vibration modals and mean quadratic velocity of X-frame sandwich plates with or without foam-filled were measured in vacuum as well as underwater through experiments. Then, numerical simulation analysis was carried out, and the results by numerical simulation analysis were highly consistent with the experimental results. Finally, the vibration performance of X-frame sandwich plates with different parameters was researched by the validated numerical simulation analysis. The results of experiments indicated that filling low-density foam into the core could increase the natural frequencies slightly and reduce the mean quadratic velocity at the natural frequencies of the plates. The low-density foam played a role in peak shaving. Improving the relative density of the core increased the natural frequencies significantly and reduced the overall mean quadratic velocity of the plates. The influence of parameter variations on vibration performance was discussed based on the favorable agreement observed between the results by experiment and simulation. The simulation results showed that the 45° X-frame sandwich plate had the smallest surface mean quadratic velocity compared with the other three designed angles including 40°, 55°, and 70° when the relative density of the core was same.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 113942"},"PeriodicalIF":6.6,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097112","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}

引用次数: 0

Dynamic response of operating wind turbines under near-field and far-field earthquakes: experimental study through combined wind tunnel and shaking table tests 近场和远场地震作用下运行风力发电机组的动力响应：风洞与振动台联合试验研究

IF 6.6 1区工程技术

Thin-Walled Structures Pub Date : 2025-09-08 DOI: 10.1016/j.tws.2025.113943

Baowei Ma , Annan Zhou , Kun Lin

{"title":"Dynamic response of operating wind turbines under near-field and far-field earthquakes: experimental study through combined wind tunnel and shaking table tests","authors":"Baowei Ma , Annan Zhou , Kun Lin","doi":"10.1016/j.tws.2025.113943","DOIUrl":"10.1016/j.tws.2025.113943","url":null,"abstract":"<div><div>This study investigates the seismic responses of wind turbines under combined wind and earthquake excitations, with specific focus on near-field (Chi-Chi) and far-field (Superstition) ground motions. A series of wind tunnel-shaking table joint tests were conducted on a 1:100 scaled wind turbine model to capture both peak and cumulative structural responses. Results show that near-field excitation leads to significantly greater nacelle displacement, acceleration, amplification factors along height, and base moment than far-field excitation, with clear response variation as peak ground acceleration (PGA) increases. Time-frequency analysis reveals that near-field motions are characterized by impulsive energy input over medium-to-high frequencies, while far-field excitations deliver relatively low-frequency, long-duration energy. Wind load contributes to seismic response by amplifying peak displacements and may increase nacelle fatigue risk. Cumulative displacement of wind turbines is strongly influenced by wind load. When the turbine is operating, the combined effect of wind and seismic loading leads to much greater overall displacement over time compared to when the turbine is shut down. These findings highlight the necessity of incorporating both ground motion characteristics and operational wind loading in the seismic design and nacelle fatigue assessment of wind turbines.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 113943"},"PeriodicalIF":6.6,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097420","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}

引用次数: 0

Vibration analysis of partially cracked thin orthotropic cylindrical shells with linearly and quadratically varying thickness: An analytical approach 线性和二次变厚正交各向异性薄圆柱壳部分开裂振动分析：一种解析方法

IF 6.6 1区工程技术

Thin-Walled Structures Pub Date : 2025-09-08 DOI: 10.1016/j.tws.2025.113939

Rahul Singh, Ankur Gupta, Nitin Kumar Jain

{"title":"Vibration analysis of partially cracked thin orthotropic cylindrical shells with linearly and quadratically varying thickness: An analytical approach","authors":"Rahul Singh, Ankur Gupta, Nitin Kumar Jain","doi":"10.1016/j.tws.2025.113939","DOIUrl":"10.1016/j.tws.2025.113939","url":null,"abstract":"<div><div>This study presents an analytical model for the free vibration analysis of thin orthotropic cylindrical shells featuring linearly and quadratically varying thickness. The shell is assumed to have a length significantly greater than its other dimensions, and a small mid-span surface crack is considered to evaluate its impact on dynamic behaviour. The governing equations of motion are derived using classical shell theory and simplified using the Donnell–Mushtari–Vlasov (DMV) formulation to incorporate the effects of thickness variation. Crack-induced stiffness reduction is modelled using crack compliance coefficients based on the Line Spring Model (LSM), accounting for both axial and circumferential crack orientations. The influence of variable thickness on structural stiffness and vibration characteristics is explicitly addressed. A closed-form solution for simply supported and clamped boundary conditions is obtained via Hamilton’s principle and separation of variables. The analytical results are validated through comparison with existing literature. A comprehensive parametric study is conducted to assess the effects of thickness gradients, crack size and position, and orthotropic material properties on the fundamental natural frequency.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 113939"},"PeriodicalIF":6.6,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097523","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}

引用次数: 0

Size-driven transitions in ballistic limit velocity and energy absorption mechanisms for plain weave fabrics 平纹织物的弹道极限速度和能量吸收机制中尺寸驱动的过渡

IF 6.6 1区工程技术

Thin-Walled Structures Pub Date : 2025-09-07 DOI: 10.1016/j.tws.2025.113941

Xuan Zhou, Xintian Li, Kaiying Wang, Guangfa Gao, Lizhi Xu

{"title":"Size-driven transitions in ballistic limit velocity and energy absorption mechanisms for plain weave fabrics","authors":"Xuan Zhou, Xintian Li, Kaiying Wang, Guangfa Gao, Lizhi Xu","doi":"10.1016/j.tws.2025.113941","DOIUrl":"10.1016/j.tws.2025.113941","url":null,"abstract":"<div><div>Aramid plain weave fabrics are extensively utilized in flexible protective systems. In this study, ballistic tests were conducted using spherical projectiles of different diameters to impact aramid fabrics with varying yarn fineness. The effects of projectile and yarn dimensions on the ballistic performance of the fabric were analyzed. Combined with numerical simulations, the study elucidated the energy transformation and distribution mechanisms during the penetration process, revealed the transition mechanism of yarn failure modes, and identified the critical threshold of size effect. Furthermore, a predictive model for the ballistic limit velocity (<em>V</em><sub>50</sub>) of single-layer plain weave fabrics was established, incorporating both size effects and the shape of the projectile nose. The results indicate that, for the same type of fabric, as the projectile diameter increases, both <em>V</em><sub>50</sub> and specific energy absorption (SEA) increase. Compared to fabrics with coarser yarns, those with finer yarns exhibit relatively higher SEA, although the former shows higher <em>V</em><sub>50</sub>. As the projectile diameter decreases and yarn fineness increases, the failure mode of the plain fabric gradually shifts from a thrusting mode to a windowing mode. A projectile-to-yarn width ratio of approximately 9 marks the transition point of the fabric failure mode and the critical threshold of the size effect. Compared to conventional models, the revised ballistic limit velocity model demonstrates significantly improved prediction accuracy, with a maximum error within 22 %.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 113941"},"PeriodicalIF":6.6,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049832","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}

引用次数: 0

Enhancing interfacial adhesion of induction welded CF/PA66 joints via fabricating a hierarchical micro-nano porous structure on heating element 在加热元件上制备微纳层次化多孔结构提高CF/PA66感应焊接接头的界面附着力

IF 6.6 1区工程技术

Thin-Walled Structures Pub Date : 2025-09-07 DOI: 10.1016/j.tws.2025.113940

Tenghui He , Jianhui Su , Xueyan Zhang , Fuyun Liu , Xiaohui Han , Jin Yang , Yunhua Deng , Bo Chen , Xiaoguo Song , Caiwang Tan

{"title":"Enhancing interfacial adhesion of induction welded CF/PA66 joints via fabricating a hierarchical micro-nano porous structure on heating element","authors":"Tenghui He , Jianhui Su , Xueyan Zhang , Fuyun Liu , Xiaohui Han , Jin Yang , Yunhua Deng , Bo Chen , Xiaoguo Song , Caiwang Tan","doi":"10.1016/j.tws.2025.113940","DOIUrl":"10.1016/j.tws.2025.113940","url":null,"abstract":"<div><div>The development of efficient and reliable bonding techniques for thermoplastic composites was crucial for lightweight and high-performance structural applications in industries such as automotive and aerospace. This study investigated the use of aluminum mesh as a heating element (HE) for the induction welding of thermoplastic composites, aiming to produce lightweight and high-strength joints. A hierarchical micro-nano porous structure was developed on the HE surfaces via an anodization and acid etching (AAE) treatment to enhance the interfacial adhesion between the HE and resin matrix. The results showed that the hierarchical micro-nano porous structure significantly increased HE surface roughness and hydroxyl adsorption, improving wettability and promoting mechanical interlocking between HE and the resin matrix during welding. Interface analysis further demonstrated that this micro-nano structure also facilitated stronger Al-O-C bond interactions between HE and resin matrix. As a result, under the synergistic effect of mechanical interlocking and chemical bonding at the HE/PA66 interface, the lap shear strength (LSS) of the AAE-treated joints increased by 45.5 %, reaching 16.06 MPa. Digital image correlation (DIC) technique analysis revealed that the hierarchical micro-nano porous structure effectively alleviated strain concentration at the weld seam. Overall, the introduction of the hierarchical micro-nano porous structure on the HE surfaces significantly improved weld seam uniformity and joint strength, providing an innovative solution for the efficient and reliable joining of thermoplastic composites.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 113940"},"PeriodicalIF":6.6,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049776","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}

引用次数: 0

A novel approach for Mindlin plate theory and application to exact solution of free vibration of moderately thick rectangular plates with two opposite guided sides 用Mindlin板理论精确求解中厚双导边矩形板自由振动的新方法

IF 6.6 1区工程技术

Thin-Walled Structures Pub Date : 2025-09-06 DOI: 10.1016/j.tws.2025.113866

Fei Long, Ya-Wei Wang, Xian-Fang Li

{"title":"A novel approach for Mindlin plate theory and application to exact solution of free vibration of moderately thick rectangular plates with two opposite guided sides","authors":"Fei Long, Ya-Wei Wang, Xian-Fang Li","doi":"10.1016/j.tws.2025.113866","DOIUrl":"10.1016/j.tws.2025.113866","url":null,"abstract":"<div><div>This study has two aims. One is to provide a novel approach for deriving the governing equation of the Reissner–Mindlin plate theory or Mindlin plate theory (MPT) and the other is to obtain exact solutions for the free vibration of thickness-torsion-locking (TTL) moderately thick rectangular plates with two opposite guided sides. First, the paper introduces a simplified analytical method to deduce the governing equations that retain the essential features of shear deformation and rotary inertia of the section. By introducing two unknown functions, one satisfies a fourth-order partial differential equation (PDE) which dominates the flexure of plates and the other meets a second-order PDE which dominates the torsion along the thickness direction. For TTL plates, only a single function is required to satisfy a fourth-order PDE and effective shear force is introduced to include the role of the twisting moment. For plates with two opposite sides guided, the free vibration of TTL plates is exactly solved by a Lévy-type solution. The exact characteristic equations are determined for ten combination cases of the other sides, including clamped, hinged, guided, and free edges. Accurate natural frequency parameters and the corresponding mode shapes are given. The effects of aspect ratio, thickness-to-side-length ratio, and boundary conditions on the vibration characteristics of plates are discussed in detail. The exact closed-form characteristic equations and their associated characteristic functions for thin plates with opposite guided supports can be reduced only if the shear stiffness is sufficiently large.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 113866"},"PeriodicalIF":6.6,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020707","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}

引用次数: 0

Nonlinear dynamics of PFG cylindrical shells reinforced with oblique stiffeners under viscous fluid flow 粘性流体作用下斜加劲PFG圆柱壳的非线性动力学

IF 6.6 1区工程技术

Thin-Walled Structures Pub Date : 2025-09-05 DOI: 10.1016/j.tws.2025.113925

Kamran Foroutan , Farshid Torabi

{"title":"Nonlinear dynamics of PFG cylindrical shells reinforced with oblique stiffeners under viscous fluid flow","authors":"Kamran Foroutan , Farshid Torabi","doi":"10.1016/j.tws.2025.113925","DOIUrl":"10.1016/j.tws.2025.113925","url":null,"abstract":"<div><div>In this paper, the nonlinear dynamic (ND) behavior of porous functionally graded (PFG) cylindrical shells (CSs) reinforced with oblique stiffeners under viscous, compressible, and non‑isentropic internal fluid flow is comprehensively analyzed using a semi‑analytical approach. Moreover, this study investigates two variations of PFG: one featuring an even porosity distribution (EPD) and the other exhibiting an uneven porosity distribution (UEPD). Lekhnitskii’s smeared stiffener approach is utilized to model the stiffeners. The nonlinear governing equations (NGEs) are formulated based on Donnel shell theory (DST) incorporating von Kármán geometric nonlinearity. Then, these equations are discretized via Galerkin’s method, and a three-term approximate solution for the deflection is established. An approach utilizing the P-T method is developed for analyzing the ND behavior of PFG-CSs reinforced with oblique stiffeners in the presence of fluid flow, providing a continuous semi-analytical solution across the full-time domain with highly accurate numerical results. This method combines a piecewise-constant argument with Taylor series expansions, hence its designation as the P-T method. The study advances the state of the art by integrating oblique stiffener effects, porosity variations, and realistic fluid–structure interaction in the analysis of PFG-CSs, thereby capturing the influence of both material distribution and internal fluid properties on their ND responses. The results demonstrate that stiffener angles, porosity distribution, and fluid characteristics significantly affect the ND behavior, providing valuable insights and design guidelines for marine risers, heavy‑oil pipelines, and aerospace propellant tanks where fluid–structure interactions are critical to structural safety and performance.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 113925"},"PeriodicalIF":6.6,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049774","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}

引用次数: 0