Thin-Walled Structures最新文献

{"title":"Improving porosity distribution and mechanical performance of multilayer sandwich composites using a new strategy of gradient curing cycles during internal thermal expansion molding process","authors":"Yunfei Peng,&nbsp;Maojun Li,&nbsp;Xujing Yang,&nbsp;Bingjie Sun,&nbsp;Shilong Lv","doi":"10.1016/j.tws.2025.113244","DOIUrl":"10.1016/j.tws.2025.113244","url":null,"abstract":"<div><div>This work introduces a novel gradient curing cycle strategy for optimizing resin impregnation flow in the internal thermal expansion molding process, aimed at significantly improving porosity distribution and enhancing mechanical performance. The proposed strategy meticulously aligns the foaming characteristics of thermal expansion foam with the curing behavior of prepregs, effectively surpassing conventional curing temperature limitations. By allowing a controlled temperature hold above the resin gelation point, this approach leverages continuous and stable foam expansion to achieve superior results. A key innovation of this work lies in demonstrating the capability of the gradient curing cycle to produce CFRP with ultra-low porosity levels as low as 0.1 % sandwich composite structures. This advancement enables a systematic investigation into the spatial evolution of inter-bundle voids and elucidates the underlying mechanism for void suppression. Furthermore, the strategy enhances the bending fracture toughness and shear strength of CFRP by 22.6 % and 6.5 %, respectively, marking a significant leap in performance compared to traditional internal thermal expansion molding methods. The findings of this work establish a solid foundation for extending the application of complex components fabricated via the internal thermal expansion molding process to more demanding operational environments and increasingly complex working conditions.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113244"},"PeriodicalIF":5.7,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726108","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":"Tensile performance of concrete-filled double skin steel tubular members using recycled aggregate concrete","authors":"Hui-Wen Tian,&nbsp;Wei Li,&nbsp;Long-Hai Lai","doi":"10.1016/j.tws.2025.113248","DOIUrl":"10.1016/j.tws.2025.113248","url":null,"abstract":"<div><div>This study investigates the axial tensile behavior of concrete-filled double-skin steel tubular (CFDST) members with recycled aggregate concrete (RAC). Axial tension tests were performed to obtain the failure modes, load and strain responses. A finite element (FE) model was developed to analyze the impact of key parameters and the interaction between the steel tubes and sandwiched RAC. The applicability of the tensile strength calculation method in the current standard, initially designed for normal CFDST members, was also evaluated for RAC-filled counterparts. Results demonstrated that RAC-filled CFDST members exhibited excellent ductility under axial tension. The confinement provided by the infilled RAC effectively enhanced the tensile strength of the steel tube. The evaluation confirmed that the current calculation method accurately predicted the tensile resistance of CFDST members using RAC.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"213 ","pages":"Article 113248"},"PeriodicalIF":5.7,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748593","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":"Feasibility study on the pultrusion of V-shaped profiles using CCF/PEEK prepreg tape","authors":"Kai Liu ,&nbsp;Wenzhe Song ,&nbsp;Zhongde Shan ,&nbsp;Congze Fan ,&nbsp;Yiwei Chen ,&nbsp;Feng Gao ,&nbsp;Yuejie Wen ,&nbsp;Jing-Hua Zheng","doi":"10.1016/j.tws.2025.113224","DOIUrl":"10.1016/j.tws.2025.113224","url":null,"abstract":"<div><div>The pultrusion process enables the continuous and efficient production of high-strength, lightweight composite materials, making it a key technology for the manufacturing of lightweight, high-performance structural components. This paper studies the effects of pultrusion temperature and velocity on the structural properties of pultruded continuous carbon fiber reinforced Poly-Ether-Ether-Ketone (CCF/PEEK) V-shaped profiles. Using CCF/PEEK prepreg tape as the raw material, the pultrusion was conducted at eight different temperatures ranging from 230 °C to 370 °C and at five velocities from 10 cm/min to 30 cm/min. V-shaped profiles with a thickness of 0.3 mm, a single-side width of 15 mm, and an angle of 60° were produced. Forming angle, surface roughness and cross-section morphology of the pultruded profiles were examined. Additionally, the bending load capacity of the pultruded V-shaped profiles was tested using a set of self-designed testing fixtures. Results show that below the melting temperature, i.e. 343 °C, as the pultrusion temperature increases from 230 to 330 °C, the formed profile angle gradually approach the target angle, i.e. 60° and the bending load capacity increased to 99.4 N. However, above the melting temperature, significant damage occurs with the apparent rough and irregular surface of the pultruded profiles, where the surface roughness increased to 20.3 μm at 370 °C, due to the extreme flow of the melted PEEK thermoplastic matrix and the friction between the exposed fibers with the die. The pultrusion velocity has a minor impact on performance. More importantly, an evaluation method, is proposed based on the penalty function, to add industrial selection of the optimum processing parameters for achieving a designed performance. With minor consideration of the surface roughness, the optimum process parameters are suggested as 330 °C with the designed velocity range from 10–30 cm/min. While the surface roughness is considered a dominant parameter, the pultrusion temperature is suggested to be reduced. Such study is expected to provide scientific guidance for future production of the beam structures using high performance CCF/PEEK prepreg tape and are expected to be applied as lightweight truss structures in aerospace applications.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"213 ","pages":"Article 113224"},"PeriodicalIF":5.7,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767830","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 general magneto-electro-elastic 3D FE model for free vibration and dynamic responses of multiphase composites","authors":"Zheng Gong ,&nbsp;Yinxiao Zhang ,&nbsp;Chunlin Du ,&nbsp;Ernian Pan ,&nbsp;Chao Zhang","doi":"10.1016/j.tws.2025.113242","DOIUrl":"10.1016/j.tws.2025.113242","url":null,"abstract":"<div><div>The fully coupled magneto-electro-elastic (MEE) properties of MEE composites complicate the prediction of their behavior in practical applications, particularly for three-dimensional (3D) vibration and dynamic responses. This paper introduces a generalized 3D MEE finite element model developed via secondary development in COMSOL. It allows users to obtain accurate results without finite element programming skills, significantly simplifying the complexity in the modeling of MEE materials. The accuracy of the proposed model in predicting natural frequency, modes, dynamic response, and stress wave propagation is first validated against exact solutions. Then, the model is employed to investigate the impacts of functional gradients, structural dimensions, perforated plate, damping, and pre-stress on the vibration characteristics and dynamic behavior of MEE composites. An empirical formula is further developed to precisely predict the fundamental frequency in MEE sandwich plates with varying stacking sequences and dimensions. For MEE sandwiches composed of piezoelectric (BaTiO₃) and magnetostrictive (CoFe₂O₄) materials with different stacking sequences, interesting novel features are observed, including the effect of piezomagnetic/piezoelectric stiffening, the influence of the geometry on the vibration and propagation of stress waves in the MEE structure. These findings offer valuable insights for the design of high-performance multiphase composites.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"213 ","pages":"Article 113242"},"PeriodicalIF":5.7,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767832","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":"Analytical, experimental, and numerical analyses of the buckling of composite ring-stiffened steel cylinders","authors":"Huayong Chang ,&nbsp;Lihui Wang ,&nbsp;Yunsen Hu ,&nbsp;Chao Kang ,&nbsp;Kechun Shen ,&nbsp;Jian Zhang","doi":"10.1016/j.tws.2025.113175","DOIUrl":"10.1016/j.tws.2025.113175","url":null,"abstract":"<div><div>In the current research, the buckling loads and modes of composite ring-stiffened steel cylinders were studied when subjected to hydrostatic pressure. Analytical formulas for forecasting the linear buckling load of ring-stiffened cylinders were derived and validated. Moreover, numerical and response surface analyses were conducted to determine the nonlinear knockdown factor (<em>K_non</em>). Pairs of nominally identical ring-stiffened and unreinforced steel cylinders were manufactured, measured, and tested, and corresponding numerical models were developed. The results from the analytical, experimental, and numerical studies were consistently in agreement. Reinforcement with composite ring stiffeners enhanced the experimental buckling loads by 258.8 % but increased weight by only approximately 17 %. Parametric analyses were also conducted to assess the impact of the composite ring's thickness and width on nonlinear buckling loads and postbuckling modes. Although the composite ring stiffeners enhanced the global structural stability and load capacity of plain cylinders, they also caused transitions in the postbuckling mode from global buckling to coupled, inter-ring, or mono-cell buckling.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113175"},"PeriodicalIF":5.7,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726106","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":"Local-global buckling behaviours of axially compressive welded I-section steel columns with local corrosion","authors":"Xinhao Han ,&nbsp;Chen Jia ,&nbsp;Qing Hu ,&nbsp;Changyong Liu ,&nbsp;Tianhao Xiang","doi":"10.1016/j.tws.2025.113239","DOIUrl":"10.1016/j.tws.2025.113239","url":null,"abstract":"<div><div>Welded I-section steel exposed to harsh environments is highly susceptible to corrosion, with local corrosion being particularly common and detrimental. Local corrosion causes uneven changes in plate thickness, leading to increased stress concentration and premature buckling in corroded regions, and a subsequent compromise in the stability. However, the influence of local corrosion on the buckling behaviours has not been clarified in prior research. This paper addresses this gap by designing and testing 12 welded I-section steel columns with simulated local corrosion (varying slenderness ratios, corrosion locations, corrosion depths and corrosion dimensions) under axial compression. Electrochemical accelerated corrosion tests were conducted to effectively simulate local corrosion, and the corrosion morphology was assessed using three-dimensional scanning technology. Axial compression tests were then conducted to study the influence of local corrosion on failure modes, load-displacement curves and cross-sectional strain development of corroded steel columns. Additionally, finite element (FE) models incorporating the scanned corrosion morphology were established and validated against test results for parametric analysis. The key parameters included geometric dimensions (slenderness ratio, width-to-thickness ratio, and thickness ratio) and corrosion region characteristics (location, depth, and dimension). Both experimental and numerical results revealed that local corrosion altered the buckling modes and decreased the residual resistance of the welded I-section steel columns under axial compression. Furthermore, the equivalent thickness and initial eccentricity coefficient were defined and incorporated into the existing codified approaches for predicting the residual resistance of welded I-section steel columns with local corrosion under axial compression.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113239"},"PeriodicalIF":5.7,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716088","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":"Laser pulses-induced thermoelastic wave propagation analysis in porous materials based on Moore–Gibson–Thompson and Love–Bishop theories using a meshless method","authors":"Seyed Mahmoud Hosseini ,&nbsp;Fengming Li","doi":"10.1016/j.tws.2025.113237","DOIUrl":"10.1016/j.tws.2025.113237","url":null,"abstract":"<div><div>This paper deals with the application of meshless generalized finite difference (GFD) method for laser pulses-induced thermoelastic wave propagation in porous materials. The governing and constitutive equations are derived for a porous rod using Moore-Gibson-Thompson (MGT) theory of coupled thermoelasticity and Love-Bishop elasticity theory for the first time. The porous rod is subjected to laser shock pulses at one of its ends. The dynamic volume fraction balance equation and the effect of porosities are taken into account to derive the MGT-based heat conduction model in porous materials. The GFD is employed to solve the governing equations in Laplace domain and then the obtained fields’ variables are transferred to time domain using Talbot Laplace inversion technique. The transient behaviors of all fields’ variables such as displacement, temperature and voids’ volume fraction are obtained for various values of the time relaxation parameter in the MGT theory. Also, propagations of thermoelastic wave fronts in displacement, temperature and volume fraction are illustrated at various time steps. To verify the proposed solution approach, the derived governing equations and results, a comparison with a good agreement is conducted in the paper.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"213 ","pages":"Article 113237"},"PeriodicalIF":5.7,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739300","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":"Free vibration and thermoelastic damping analysis of size-dependent piezoelectric circular plate considering surface effect and nonlocal dual-phase-lag heat conduction model","authors":"Shuanhu Shi,&nbsp;Qiang Li","doi":"10.1016/j.tws.2025.113238","DOIUrl":"10.1016/j.tws.2025.113238","url":null,"abstract":"<div><div>Based on classical mechanics methods, this paper examines the size-dependent thermal-mechanical-electrical (TME) coupling performance of a piezoelectric thermoelastic circular nanoplate. The governing equation of the temperature field was derived from the nonlocal dual-phase lag heat conduction model (NDPL model), the fundamental energy balance equation, and the constitutive expression of the entropy. The influence of the surface effect was introduced into the equations of motion and the electric field in the form of surface tension and surface electric displacement, respectively. Analytical solutions for temperature variation, resonant frequency (RF), thermoelastic damping (TED), frequency shift (FS), and frequency attenuation (FA) were obtained. The correctness of the TED expression has been verified. Based on the numerical results, it is worth noting that the nonlocal thermal length (NTL) parameter reduces the real and imaginary parts of temperature variation gradient within the range of small-size effect, thereby decreasing the TED and the FS due to reduced TME coupling. Moreover, as the NTL parameter increases, the impact of thermal relaxation time on TED becomes more significant, while the surface effect on TED is relatively weaker. Additionally, the influences of key factors on TED and FS were discussed. This study showed that the surface effect and the nonlocal thermal effect have distinct impacts on TME coupling behavior. This research is helpful for the design of high-performance piezoelectric resonators.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"213 ","pages":"Article 113238"},"PeriodicalIF":5.7,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739371","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 buckling and post-buckling of multilayered piezoelectric graded porous circular nanoplates considering of surface/interface effects","authors":"Qinglu Li ,&nbsp;Xiaojie Niu ,&nbsp;Zhaoyi Pan ,&nbsp;Jinghua Zhang","doi":"10.1016/j.tws.2025.113236","DOIUrl":"10.1016/j.tws.2025.113236","url":null,"abstract":"<div><div>The special characteristics of surfaces and interfaces significantly influence the durability and performance of materials. For the first time, this article introduces surface and interface effects into Kirchhoff thin plate theory to study the buckling and nonlinear post-buckling behavior of multilayer piezoelectric porous nanostructures. The bulk structure is a graded porous material and pores are embedded in the plate in two cosine forms of non-uniform porosity distribution with a pair of piezoelectric layers surface bonded on both sides of the bulk surface. Then, classical plate theory, combined with minimum potential energy principle, is utilized to derive the post-buckling governing equation coupling the piezoelectric effect. A shooting method is presented to obtain the buckling and post-buckling numerical solutions. The numerical results obtained reveal that the surface and interface effects, along with the applied potential, significantly influence the stability of multilayer piezoelectric graded porous circular nanoplates to varying extents.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113236"},"PeriodicalIF":5.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716202","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":"Mechanical properties of a novel mechanical metamaterial with multi-stable and mono-stable characteristics","authors":"Min Sun ,&nbsp;Zhiwei Qiu ,&nbsp;Qiang Chen ,&nbsp;Hongshuai Lei ,&nbsp;Xia Hua ,&nbsp;Zheng Zhang ,&nbsp;Yi Song ,&nbsp;Shaofei Jiang ,&nbsp;Diyong Huang ,&nbsp;Haonan Fu","doi":"10.1016/j.tws.2025.113230","DOIUrl":"10.1016/j.tws.2025.113230","url":null,"abstract":"<div><div>This study designed a novel mechanical metamaterial with multi-stable and mono-stable characteristics, fabricated using carbon fiber composite through a hot-pressing process. The mechanical properties of the designed mechanical metamaterial were obtained through quasi-static compression tests, and the effects of structural geometric parameters on its mechanical performance were analyzed. The finite element model of the mechanical metamaterial was established, and the comparison between the simulation and experiment results showed good agreement. A torque test platform was constructed to measure the torque for transitions between the multi-stable and mono-stable characteristics. The results indicate that transitioning from mono-stable to multi-stable characteristics requires a higher torque than transitioning from multi-stable to mono-stable characteristics. The designed mechanical metamaterial has both multi-stable and mono-stable characteristics, which have potential for a wide range of applications in the field of impact energy absorption as well as vibration attenuation.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113230"},"PeriodicalIF":5.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726107","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}