Thin-Walled Structures最新文献

{"title":"Artificial neural network-assisted groove morphology control in laser engraving","authors":"Hongshan Zhou,&nbsp;Zelong Yu,&nbsp;Aoji Du,&nbsp;Ruiyi Fan,&nbsp;Jingyuan Chen,&nbsp;Xu Guo,&nbsp;Zhao Zhang","doi":"10.1016/j.tws.2026.114668","DOIUrl":"10.1016/j.tws.2026.114668","url":null,"abstract":"<div><div>Laser engraving/chemical milling is one of the key techniques for achieving structural lightweighting in the manufacturing of thin-walled components in aerospace applications involving the stress relief phenomenon. The consistency of the laser engraving groove morphology directly affects the quality of the subsequent chemical milling process and poses a significant challenge due to the uneven maskant and the complex laser-material interaction during the process. To address this problem, an artificial neural network (ANN)-assisted adaptive laser model is proposed. Based on the laser scanning speed and maskant parameters, the adaptive laser model generates a corresponding power to achieve the precise control of groove morphology during laser engraving. The error between the laser-engraved model and the experimental results is less than 5.99%. The feasibility of the ANN-assisted adaptive laser model is verified, with a prediction error of 5.87% compared to the target values. The correlation coefficient between predicted and experimental data is 0.98997, indicating a strong fitting relationship. The ANN-assisted adaptive laser model significantly improves the consistency of groove morphology in laser engraving.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114668"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387177","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":"Wire arc additively manufactured aluminium alloy open sections: 3D geometric analysis and compressive behaviour","authors":"Jin Li ,&nbsp;Ziyi Wang ,&nbsp;Man-Tai Chen ,&nbsp;Andi Su ,&nbsp;Ou Zhao","doi":"10.1016/j.tws.2026.114687","DOIUrl":"10.1016/j.tws.2026.114687","url":null,"abstract":"<div><div>Wire arc additive manufacturing (WAAM) is sparking extensive research interests in recent years, as the technique offers an efficient pathway fabricating metallic structural components with complex geometries. However, the limited insights into the structural performance of WAAM metallic members hinder their practical application in construction. As part of an ongoing research project on WAAM metallic members, this paper presents an experimental study on the geometric features and cross-section compressive behaviour of WAAM aluminium alloy open section stub columns. Fifteen stub column specimens with angle, channel and π-shaped section profiles were firstly printed using ER5356 aluminium alloy feedstock wires and tested under compression to study their local buckling behaviour. Before testing, the geometric properties and geometric imperfections (including initial local geometric imperfections and cross-section out-of-squareness) of the specimens were inspected using a 3D laser scanner. The measured initial local geometric imperfections and out-of-squareness of each specimen were analysed. The results from stub column tests were subsequently used to assess the applicability of cross-section classifications and predicted resistances from existing design methods (for conventionally fabricated aluminium alloy members), including the European, American and Australian/New Zealand codes, together with the continuous strength method (CSM). The assessment results generally revealed that (i) the three sets of codified slenderness limits provided safe cross-section classification, with more accurate classification offered by the American specification and Australian/New Zealand standard and (ii) the three design codes provided safe compression resistance predictions (though conservative to different extents, especially for the stocky cross-sections), while the Annex H of the European code and the CSM provided more accurate and consistent resistance predictions due to their proper consideration of material strain hardening.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114687"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387267","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":"Quasi-static and dynamic compression behavior of 3D-printed TPMS–Gyroid cellular material","authors":"Wenfang Yuan ,&nbsp;Kefeng Peng ,&nbsp;Yuying Ma ,&nbsp;Yuxuan Zheng ,&nbsp;Baixue Chang ,&nbsp;Zhijun Zheng","doi":"10.1016/j.tws.2026.114681","DOIUrl":"10.1016/j.tws.2026.114681","url":null,"abstract":"<div><div>TPMS–Gyroid cellular materials demonstrate excellent performance in terms of specific strength and energy absorption, making them ideal candidate materials for lightweight protective structure design. The mechanical response of Gyroid cellular material under quasi-static compression, direct impact, and mass impact was experimentally investigated in this study. Constitutive models were employed to characterize the mechanical response and power-law relationships between their material parameters and the relative density were obtained. Cellular specimens were fabricated from PLA and tested by using the Taylor–Hopkinson pressure bar experimental technique combined with high-speed photography. In experimental tests, two deformation patterns were observed: a topology-dominated, random, layered collapse under quasi-static loading and an inertia-dominated, layer-by-layer collapse under dynamic impact. The initial crush stress and strain-hardening parameter, and their power-law density dependence, were determined. Experimental tests involving both large-mass, low-velocity and small-mass, high-velocity impacts confirmed that the dynamic constitutive model of Gyroid cellular material demonstrated excellent predictive performance. Therefore, the feasibility and reliability of the constitutive relationship for Gyroid cellular materials were verified, and the resulting shock models can guide the design of protective structures in engineering practice.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114681"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387271","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 behaviour of high-strength concrete-filled high-strength steel tubular columns after fire exposure","authors":"Tao Du ,&nbsp;Faqi Liu ,&nbsp;Hua Yang ,&nbsp;Yinglong Li","doi":"10.1016/j.tws.2026.114640","DOIUrl":"10.1016/j.tws.2026.114640","url":null,"abstract":"<div><div>The emphasis of this paper is on the buckling behaviour of high-strength concrete-filled high-strength steel tubular (HCFHST) columns after exposure to fire. Nine slender HCFHST specimens were subjected to ISO 834 standard fire and axial load after cooling. The failure mode, deformation, buckling capacity, and strain of the specimens were monitored and reported. With a reduction close to that in cross-sectional capacity, the buckling capacity of specimens with a slenderness ratio of 53 decreases by 32.6% and 48.1% following exposure to fire for 45 min and 90 min, respectively. Furthermore, the experimental results indicate that the effects of fire duration and slenderness ratio on buckling capacity were essentially found to be uncoupled within the experimental parameters. A thermo-mechanical coupled finite element model was established using ABAQUS and confirmed to be reliable through comparison with the test results. A parametric analysis was carried out to investigate the effects of a wider range of parameters, including fire duration, cross-sectional diameter, slenderness ratio, steel ratio, and material strength, on the residual buckling resistance. Finally, the historical peak temperatures and the reduction in material residual performance were incorporated into the existing ambient-temperature resistance design methods. The methods can be used to predict the residual buckling resistance of slender HCFHST columns, assess their post-fire safety, and provide a basis for subsequent strengthening.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114640"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387273","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 low-cycle fatigue crack growth prediction method for ship stiffened plates considering accumulative plastic damage","authors":"Yuelin Song ,&nbsp;Zhi Xu ,&nbsp;Chenyang Liu ,&nbsp;Ziya Peng ,&nbsp;Shanyu Xu ,&nbsp;Cheng Zhao ,&nbsp;Jiping Zhang","doi":"10.1016/j.tws.2026.114658","DOIUrl":"10.1016/j.tws.2026.114658","url":null,"abstract":"<div><div>This research explores the characteristics of low-cycle fatigue crack growth in stiffened plate structures from the perspective of cumulative plastic damage. A novel predictive approach for fatigue crack growth rates is proposed, which integrates a correction factor to account for welding residual stress effects and utilizes accumulated plastic dissipation energy at a critical distance ahead of the crack tip as the driving parameter. The stiffened plate specimen with a central stiffener is fabricated to examine crack propagation behavior, focusing on single-sided and double-sided crack positions relative to the stiffener. A numerical program is developed to simulate simultaneous crack propagation in the plate and stiffener, enabling evaluation of cumulative plastic damage under cyclic stress. The proposed method demonstrates high accuracy in predicting fatigue crack growth rates for welded stiffened plates, as evidenced by strong agreement between predictions and experimental data.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114658"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387276","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":"Intelligent vibration control of variable stiffness bistable composites laminate for curvilinear fiber trajectory with asymmetric laying strategy","authors":"X.M. Liu ,&nbsp;Y.X. Hao ,&nbsp;W. Zhang ,&nbsp;H.D. Xia ,&nbsp;S.W. Yang ,&nbsp;Y.T. Cao","doi":"10.1016/j.tws.2026.114677","DOIUrl":"10.1016/j.tws.2026.114677","url":null,"abstract":"<div><div>Recently, variable-stiffness bistable laminates with curved fibers have gained attention in deformation structure research. Compared to straight-fiber bistable laminates, they offer reduced weight, adjustable stiffness, and a broader range of stable configurations. This study explores the stable-state configuration, natural frequency, and nonlinear vibration-active control using active methods for a bistable composite laminate with variable stiffness (VSBCL) simply supported at its four corners. Using a 17-parameter polynomial configuration function that accounts for the local influence and boundary effects of smart piezoelectric materials on the stable-state configuration of bistable structures, the configuration equation for the system is formulated using the von Karman geometric nonlinear strain-displacement relation and the energy principle. Furthermore, a nonlinear ordinary differential equation incorporating electromechanical coupling is derived for the system. Using this equation, the characteristics of the stable-state configuration under various fiber curvature-laying paths are examined and compared with finite-element analysis results. The natural vibration characteristics are then discussed. Employing fuzzy control theory, a fuzzy controller with VSCBL curvature as the key parameter is designed. Its performance and reliability are further validated through a comparative analysis with the traditional PID controller. Then, the nonlinear dynamic behavior and fuzzy control of the bistable laminated structure are investigated under various loading conditions, including step, decreasing, increasing, and sinusoidal loads. Numerical simulations under multiple conditions show that the proposed fuzzy control strategy greatly improves structural response regulation, providing a practical method for actively controlling a vibrating variable-stiffness bistable composite laminate.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114677"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386817","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":"Effects of processing parameters on the Mode I interlaminar fracture toughness of additively manufactured continuous glass fiber reinforced PEEK composites","authors":"Hao Zhang ,&nbsp;Yiwei Chen ,&nbsp;Wenzhe Song ,&nbsp;Jing-Hua Zheng ,&nbsp;Congze Fan ,&nbsp;Zhongde Shan","doi":"10.1016/j.tws.2026.114671","DOIUrl":"10.1016/j.tws.2026.114671","url":null,"abstract":"<div><div>Additive manufacturing of continuous fiber reinforced polymer composites enables precise fiber placement and design flexibility, making it a key technology for fabricating aerospace and automotive components. Evaluating the interlaminar fracture toughness of additively manufactured composites is crucial, as low resistance to opening-mode delamination can compromise interlayer fusion quality and impair the reliability of high-precision applications. This study employed Response Surface Methodology (RSM) to correlate nozzle temperature, printing speed, and layer thickness with the Mode I interlaminar fracture toughness (<em>G_IC</em>) of additively manufactured CGF/PEEK composites through Double Cantilever Beam (DCB) tests. Analysis of Variance (ANOVA) and univariate analysis were employed to evaluate the effects of individual factors and their interactions, revealing statistically significant influences on fracture toughness. Results showed that layer thickness had the most significant effect on <em>G_IC</em>. Reducing the layer thickness from 0.24 mm to 0.16 mm increased the average <em>G_IC</em> from 57.2 J/m² to 533.2 J/m². Mechanistically, thinner layers facilitated deeper thermal penetration and polymer chain entanglement while suppressing interlaminar voids. These conditions facilitated robust energy-dissipation mechanisms, including fiber bridging and microscale tearing, during the fracture process. To further elucidate the interlaminar behavior of CGF/PEEK, the fusion process and failure characteristics were analyzed, leading to the development of a mechanistic model that demonstrates high predictive accuracy (<em>R</em>²≈0.972). This study establishes a processing foundation for producing additively manufactured CGF/PEEK components with high interlaminar fracture toughness suitable for aerospace applications.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114671"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386974","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":"Designing anisotropic mechanical metamaterials and metastructures: a review","authors":"Zhongkai Ji ,&nbsp;Dawei Li ,&nbsp;Xiaoya Zhai ,&nbsp;Jie Gao ,&nbsp;Yunlong Tang ,&nbsp;Ning Dai ,&nbsp;Wenhe Liao ,&nbsp;Yong Zhao ,&nbsp;Yi Min Xie","doi":"10.1016/j.tws.2026.114719","DOIUrl":"10.1016/j.tws.2026.114719","url":null,"abstract":"<div><div>Mechanical metamaterials and metastructures exhibit unconventional mechanical and functional properties not found in conventional materials. The unique characteristics originate from special geometric and topological arrangements of their constituent unit cells. Anisotropy is a fundamental physical property and is instrumental in tailoring mechanical responses. Its strategic implementation is a key determinant for achieving structure-function integration, expanding the accessible design space, and addressing multi-physics coupling requirements. Consequently, the precise orchestration of material architecture to elicit targeted functionalities has become a central theme in advanced materials research. Advanced computational design and additive manufacturing are pivotal in creating bio-inspired metamaterials, mimicking the complex anisotropy of natural structures to achieve integrated functionalities. This review summarizes recent advancements in anisotropic design, covering its conceptual evolution and classification. It analyzes unit-cell design methodologies, highlighting the shift toward intelligent, data-driven algorithms. The review explores macroscopic deformation in metastructures, controlled by spatially modulating unit-cell properties. Finally, this work synthesizes key strategies and evaluates future trajectories, aiming to establish a theoretical foundation and propose new paradigms. These efforts are intended to accelerate the discovery and implementation of next-generation metamaterials and metastructures.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114719"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386978","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":"Folding mechanism within a prestrained composite tape-spring structure","authors":"Chenmin Zhao ,&nbsp;Bing Wang ,&nbsp;Chenglong Guan ,&nbsp;Guofu Lian","doi":"10.1016/j.tws.2026.114715","DOIUrl":"10.1016/j.tws.2026.114715","url":null,"abstract":"<div><div>A composite tape-spring (CTS) structure is a thin-walled structure with a curved cross-section. Owing to its curved cross-section being capable of flattening, the CTS is well-suited for folding. Its ability to fold under large displacement makes it attractive as a hinge safety component. Compared with the traditional lock-link connection, its weight, complexity and maintenance can be reduced. Among them, the internal stress level of the CTS determines its folding mechanism, while the traditional composite manufacturing method is tricky to tailor the internal stress. In this paper, we developed a biaxial elastic fibre prestraining method to design prestrained CTS. The biaxial fibre tensile rig was designed to apply tension in the warp and weft directions of the plain-weave carbon prepreg, and the tension constant during the curing process. The FEA and theoretical were established and calibrated by the experimental data. The peak strain of the folding band was studied to evaluate the effect of prestrain on the folding strain. It is found that elastic fibre prestraining can effectively adjust the internal strain/stress level of the prestrained CTS, and can reduce the maximum tensile strain, thereby improving the load-carrying capacity. These findings will contribute to the structural design of foldable mechanical hinges.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114715"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386981","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":"An analytical solution for elliptical arc crack in orthotropic materials with equal characteristic roots","authors":"Wei Yi,&nbsp;Yinian Wu,&nbsp;Shuxin Huang,&nbsp;Qiuhua Rao,&nbsp;Jiawei Liu,&nbsp;Kai Shen,&nbsp;Shaobo Jin","doi":"10.1016/j.tws.2026.114583","DOIUrl":"10.1016/j.tws.2026.114583","url":null,"abstract":"<div><div>Accurate determination of stress intensity factors (SIFs) for a curved crack in orthotropic materials is critically important for assessing the stability of engineering structures and predicting the formation of fracture networks in shale-gas and geothermal development. Although the semi-analytical solutions for curved crack in anisotropic materials are well-established, fully analytical solutions for elliptical arc cracks in orthotropic materials remain scarce. In this study, we develop a closed-form analytical solution for the SIFs of an elliptical arc crack embedded in an orthotropic infinite plane under remote loading, under the condition that the material exhibits equal characteristic roots. The proposed method integrates affine transformation, conformal mapping, and complex variable theory to transform the original orthotropic problem into an equivalent isotropic one, whereby explicit expressions for the complex potentials and SIFs are systematically derived. The accuracy and robustness of the solution are validated through comparison with existing exact results for circular arc crack and finite element results for elliptical arc crack. Furthermore, the presented analytical framework can be extended to analyze other types of crack configurations such as branched cracks in orthotropic materials with equal characteristic roots, providing a theoretical foundation for advanced fracture mechanics assessments in anisotropic solids.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114583"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387269","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}