Thin-Walled Structures最新文献

{"title":"Surface damage characterisation of longitudinal torsional ultrasonic vibration-assisted grinding of orthogonally woven SiCf/SiC composites based on different fibre orientation","authors":"Qixuan Sun ,&nbsp;Zhen Yin ,&nbsp;Qinglong An ,&nbsp;Zehui Liang ,&nbsp;Qing Miao ,&nbsp;Chenwei Dai ,&nbsp;Ming Zhang ,&nbsp;Hua Li ,&nbsp;Chenwei Shan","doi":"10.1016/j.tws.2025.114066","DOIUrl":"10.1016/j.tws.2025.114066","url":null,"abstract":"<div><div>Owing to their exceptional properties, including high-temperature resistance, corrosion resistance, and low density, SiC_f/SiC composites have emerged as promising candidate materials for hot-section components in aeroengines. However, their exceptional hardness, inherent brittleness, and anisotropic structure make them highly susceptible to severe machining-induced damage. To address this issue, comparison experiments between longitudinal torsional ultrasonic vibration-assisted grinding (LTUAG) and conventional grinding (CG) comparison experiments were performed on SiC_f/SiC composites. Quantitative characterisation of fibre surface damage was performed with respect to grinding direction and fibre orientation. Fibre pull-out length, edge chipping factor, and three-dimensional surface roughness (Sa) were used to comprehensively evaluate the surface damage behaviour of SiC_f/SiC composites and to explore methods for surface damage suppressing during LTUAG. The results showed that LTUAG increased grain grinding speed and enhanced instantaneous impact force, thereby reducing fibre fracture and pull-out length. Moreover, ultrasonic vibration can promote micro-brittle fracture of the material and reduce the phenomenon of fibre debonding. When the grinding direction was parallel to fibre orientation, a longitudinal amplitude of 8 μm produced the shortest transversal fibre pull-out length and minimal surface damage. When the grinding direction was perpendicular to the fibre orientation, a larger longitudinal amplitude of 10 μm more effectively suppressed edge chipping damage of longitudinal fibres. When the grinding direction formed an acute angle with fibre orientation, surface damage and surface roughness were markedly reduced. Grinding along the transversal fibre direction provided optimal damage suppression, achieving a minimum surface roughness Sa value of 2.54 μm.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 114066"},"PeriodicalIF":6.6,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267429","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 integrated modeling of AFP tow-drop defects and curing process of variable-stiffness thermoset composite laminates","authors":"Rutong Yang ,&nbsp;Shengnan Zhang ,&nbsp;Yingjie Xu ,&nbsp;Weihong Zhang","doi":"10.1016/j.tws.2025.114064","DOIUrl":"10.1016/j.tws.2025.114064","url":null,"abstract":"<div><div>This paper investigates the effects of tow-drop defects on the curing residual stress and deformation of variable-stiffness laminates. Tow-drop defects refer to small triangular resin-rich regions without fibers that are produced when tow overlaps are cut during the manufacturing of variable-stiffness thermoset composite laminates with curvilinear fiber paths using automated fiber placement (AFP) technology. An integrated modeling is proposed to incorporate the tow-drop defects into the curing process simulation. The geometric model of variable-stiffness laminates including tow-drop defects is established first. Thermal-chemical coupled and thermal-mechanical coupled analyses are then performed to reveal the evolution mechanism of curing residual stress and deformation. Influences of fiber orientation, tow width and tow number of the AFP process are further investigated. The results show that the tow-drop defects affect the curing quality of thermoset variable-stiffness composites. Especially, the lower tow width and higher tow number can greatly reduce the defects.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 114064"},"PeriodicalIF":6.6,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267427","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":"Ballistic behavior of bionic UHMWPE laminates with double-helicoidal lay-ups","authors":"Pengcheng Hu ,&nbsp;Xiaobin Li ,&nbsp;Wei Chen ,&nbsp;Xinxin Ge ,&nbsp;Zixiao Hu ,&nbsp;Yuelin Zhang ,&nbsp;Yuansheng Cheng ,&nbsp;Pan Zhang","doi":"10.1016/j.tws.2025.114059","DOIUrl":"10.1016/j.tws.2025.114059","url":null,"abstract":"<div><div>Inspired by the double-helical structure of coelacanth scales, the bio-inspired double-helicoidal UHMWPE laminates with helicoidal fiber architectures were designed and fabricated. A combined experimental and numerical simulation approach was employed to investigate the ballistic response of these biomimetic laminates under high-impact velocities. The damage patterns and failure mechanisms of laminates with different pitch angles were systematically identified and analyzed. The increased pitch angle was found to constrain the indirect tensile mechanisms and bulging deformation of the laminate, leading to severe ply splitting on the rear surface. The effects of interfacial strength in the bio-inspired laminates and projectile nose shape on ballistic performance were comprehensively elucidated. The results revealed that the cross-ply configuration exhibited superior ballistic performance against flat-nosed projectiles. However, under conditions of reduced interlayer strength or hemispherical-nosed projectile impacts, laminates with smaller pitch angles demonstrated significantly enhanced ballistic resistance.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 114059"},"PeriodicalIF":6.6,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267428","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":"Height-independent optimal gradients in honeycombs boost energy absorption through delocalized deformation mechanism","authors":"Yang Gao ,&nbsp;Jie Jiang ,&nbsp;Buyun Sun ,&nbsp;Liwei Song ,&nbsp;Jianping Zuo ,&nbsp;Yujie Wei","doi":"10.1016/j.tws.2025.114060","DOIUrl":"10.1016/j.tws.2025.114060","url":null,"abstract":"<div><div>Gradients, as ubiquitous features in nature, have served as a fundamental inspiration for the design and fabrication of high-performance synthetic materials and components with spatially varying properties. In our previous work, gradient strategy was implemented in honeycomb structures (HCSs) for enhanced impact resistance, where optimal gradient profiles were determined through a neural network-based machine learning approach. Following the established methodology, this study extends the optimization to graded HCSs of different characteristic heights (defined as <em>H</em>/<em>d</em>, where <em>H</em> is HCS height and <em>d</em> is indenter tip diameter). It was found that for both hexagonal and re-entrant HCSs, the optimal gradient parameters are independent of characteristic height, whereas their energy absorption capacity exhibits linear scaling with height. Through numerical analysis and 3D printing-based experimental validation, this scaling behavior was attributed to the delocalized deformation mechanism, which causes the energy dissipation zone to expand proportionally with increasing structural height. Results presented in this work would provide critical insights for implementing functionally graded HCSs in various energy-absorbing applications, significantly advancing their practical engineering utility.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 114060"},"PeriodicalIF":6.6,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267992","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":"Design expressions for distortional lateral buckling of beams with T-sections","authors":"Amin Iranpour,&nbsp;Magdi Mohareb","doi":"10.1016/j.tws.2025.114058","DOIUrl":"10.1016/j.tws.2025.114058","url":null,"abstract":"<div><div>T-sections possess unique characteristics that significantly influence their lateral-torsional buckling (LTB) capacity. Compared to typical I-sections, their lower warping constant and single-side stiffened stems make them particularly vulnerable to distortional LTB. Despite these vulnerabilities, favorable properties such as a high minor-to-major moment of inertia ratio can enhance their LTB capacity. Current North American steel design standards (ANSI/AISC360 2022 and CAN/CSA-S16 2019) simplify the critical moment equation by omitting several effects including (1) moment gradient, (2) load height, (3) Pre-Buckling Deformation (PBD), and (4) cross-sectional distortion. These simplifications are shown to lead to inaccurate predictions of the critical moments. A parametric investigation shows that lateral torsional buckling equations for T-sections in North American standards can lead to deviations of more than ±40 % from those predicted by shell-based finite element modeling. Towards developing improved solutions, the present study combines Rayleigh-Ritz approximate techniques with artificial neural network to develop a critical moment expression that incorporates moment gradient, load height, PBD, and distortional effects. An alternative analytical expression is proposed in the form of an interaction equation. The proposed solutions are shown to significantly improve the prediction of critical moments. The potential use of the expression in a design context is illustrated through an example. A comparison with shell finite element analysis reveals that, in a case where design standards overestimate the critical moment by 40 %, one of the proposed solutions provides a conservative estimate within 16 % while the other solution overpredicts the capacity by only 6 %.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 114058"},"PeriodicalIF":6.6,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267986","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":"Behaviour and design of sheathed light gauge steel panels subjected to in-plane shear and gravity loads","authors":"Nikolas Ringas ,&nbsp;R. Mark Lawson ,&nbsp;Dilum Fernando ,&nbsp;Yuner Huang","doi":"10.1016/j.tws.2025.114047","DOIUrl":"10.1016/j.tws.2025.114047","url":null,"abstract":"<div><div>The in-plane shear behaviour of sheathed light gauge steel wall panels is investigated by tests on 2.4 m square wall panels together with push-out tests, to determine the shear fixing stiffness and resistance. Parameters such as sheathing material, screw geometry, stud arrangement, adhesives, combined bracing with sheathing boards, and profiled sheeting were considered. An X-braced panel was used as a benchmark and to interpret the forces in the bracing obtained from measured strains. Wall panels with single C- and back-to-back C- sections in the middle of the panel have equivalent shear stiffness and resistance. The use of non-winged fixings can significantly enhance the stiffness of the panel due to increased thread engagement with the board material. Adhesives on the board-frame interface reduce damage evolution on the board material, while significantly increasing both stiffness and resistance. The tests also included the combination of X-bracing and sheathing boards to determine how their stiffnesses may be combined. It was also shown that profiled steel sheets serve as a potential alternative to X-bracing, although they require more fixings. The design approach based on elastic theory for the fixing properties obtained from push-out tests is in close agreement with the test results obtained from the representative wall panel tests, where the ratio of the recorded to the predicted panel shear stiffness and resistance have an average of 1.03 and 1.05, respectively, with a variation of up to 8 %.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 114047"},"PeriodicalIF":6.6,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267982","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":"Structural behavior of cold-formed steel trusses incorporating built-up section chords","authors":"Wei Wang ,&nbsp;Krishanu Roy ,&nbsp;Hooman Rezaeian ,&nbsp;James B.P. Lim","doi":"10.1016/j.tws.2025.114054","DOIUrl":"10.1016/j.tws.2025.114054","url":null,"abstract":"<div><div>Cold-formed steel (CFS) built-up box sections often exhibit axial strengths greater than the sum of their individual components. Since truss members primarily carry axial forces, they are well-suited for replacement with such sections. Incorporating high-performance Howick Rivet Connectors (HRCs) enables these built-up members to substantially improve the load-bearing performance of truss systems. However, related studies remain limited. This study addresses this gap by investigating the structural performance and design methodology of such trusses for potential applications in modular construction. A comparative experimental program, involving 64 specimens, was conducted to evaluate the axial capacity and failure behavior of built-up columns with HRCs versus conventional screw fasteners. Finite element models were developed and validated against experimental results, enabling a parametric study of trusses with built-up chord and diagonal members. Among the truss configurations investigated, replacing only the chord members with built-up sections achieved the highest ratio of serviceability limit strength to self-weight and demonstrated the most structurally efficient performance. A practical design method was subsequently proposed to enhance the accuracy of truss strength predictions by accounting for the effects of eccentric compressive loading in the chord members.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 114054"},"PeriodicalIF":6.6,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268045","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":"In-plane behavior of arc-walled hexagonal honeycombs","authors":"Shuxin Li ,&nbsp;Fukun Xia ,&nbsp;Xuefei Wang ,&nbsp;Dong Ruan","doi":"10.1016/j.tws.2025.114053","DOIUrl":"10.1016/j.tws.2025.114053","url":null,"abstract":"<div><div>Honeycombs show high specific strength and energy absorption capacity. However, the in-plane dynamic performance of curved hexagonal honeycombs has not been adequately investigated. This study investigates the in-plane compressive behavior of advanced arc-walled hexagonal honeycombs, characterized by additional arc walls and lens-shaped cavities. Finite element models were developed to evaluate the in-plane compressive performance of the proposed honeycombs subjected to in-plane compression. Parametric study was performed to examine the effects of impact velocity, wall thickness, and arc angle on the mechanical behavior of the proposed honeycombs. Three deformation modes, “X”, “V”, and “I”, were identified at low, moderate and high velocities. Plateau stress and energy absorption capacity were improved with the increase in the impact velocity and wall thickness. The arc angle also showed an enhancement effect on the plateau stress, energy absorption (<em>EA</em>) and specific energy absorption (<em>SEA</em>), particularly as it increased from 0° to 60°. Based on the repeatable collapsing mechanism used by Hu and Yu, a theoretical analysis was performed to evaluate the plateau stress of the proposed honeycombs subjected to in-plane compression at high velocities with an average discrepancy of 8.12 %. The incorporation of arc walls in hexagonal honeycombs demonstrates enhanced plateau stress, <em>EA</em>, and <em>SEA</em>, with improvement ratios of up to 172 %, 152 %, and 41 %, respectively, relative to the traditional design. These improvements arise from the additional arch walls which generate lens-shaped cavities, which, despite adding mass, offer superior performance compared to the traditional honeycomb under dynamic compression at high velocities.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 114053"},"PeriodicalIF":6.6,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267424","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":"Enhanced deformation resistance and load-bearing performance of inflatable balloons with flexible support skeletons","authors":"Weinan Gao ,&nbsp;Guohui Wang ,&nbsp;Guochang Lin ,&nbsp;Huifeng Tan ,&nbsp;Zhenyu Ma ,&nbsp;Guangbin Yu ,&nbsp;Xueyan Chen","doi":"10.1016/j.tws.2025.114046","DOIUrl":"10.1016/j.tws.2025.114046","url":null,"abstract":"<div><div>High-altitude flexible balloons have attracted significant interest for their lightweight construction, compact stowage volume, and reliable deployment. However, their thin-walled, flexible materials make them highly sensitive to external stimuli, which can induce substantial deformations, diminish structural load-bearing capacity, and even lead to functional failure. To address this challenge, we propose a novel strategy for incorporating flexible support skeletons into inflatable balloons to reduce deformation and enhance load-bearing performance. Effects of support-skeleton arrangement and internal pressure on balloon deformation and load-bearing characteristics are further examined through numerical simulations and experimental tests. Results demonstrate that, by optimizing the stress distribution of the inflatable balloon with supporting frameworks, the structure retains exceptional shape stability and load-bearing performance even under extreme low-pressure conditions (P = 1 Pa), achieving 1.80 times the capacity of frameless configurations at a framework pressure of 50 kPa. Intersecting internal flexible frameworks deliver the best performance, reducing maximum structural displacement by 47.43 % compared to conventional inflatable balloons. Notably, when accounting for weight effects, they yield absolute improvements of 33.33 % in geometric stability and 41.67 % in load-bearing capacity. This approach offers a practical design pathway for shape retention and load support in next-generation, high-capacity aerostats.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 114046"},"PeriodicalIF":6.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267989","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":"Cyclic experiments and design of vertically-flexible stiffened steel plate shear walls","authors":"Bing-Zhe Liu ,&nbsp;Zhao-Yu Xu ,&nbsp;Gen-Shu Tong ,&nbsp;Jian Hou ,&nbsp;Chao-Qun Yu ,&nbsp;Jing-Zhong Tong","doi":"10.1016/j.tws.2025.114049","DOIUrl":"10.1016/j.tws.2025.114049","url":null,"abstract":"<div><div>Steel plate shear wall (SPSW) has been widely applied in high-rise building structures to resist lateral loading effects. However, SPSWs are subjected to substantial vertical gravity loads, and thus the shear performance of the SPSWs is inevitably influenced. To mitigate the effects of vertical loads on the SPSWs, a novel vertically-flexible stiffened steel plate shear wall (VFS-SPSW) is reported in this paper. By using hollow rectangular steel tubes as horizontal stiffeners, low vertical stiffness of the SPSW is exhibited for releasing the vertical loading, and thus the impact of gravity loads is minimized. In this study, three 1:2 scaled specimens were designed and tested under quasi-static cyclic loading to evaluate the seismic behavior of the VFS-SPSWs. By analyzing the test results, the load-resistant mechanism, deformation characteristic and failure mode of the VFS-SPSWs were revealed. Additionally, a finite element (FE) model was developed, and it is demonstrated to well reflect the hysteretic performance and failure mode of the test specimens. By conducting extensive parametric analysis, the influence of key design parameters on the behavior of the VFS-SPSWs was revealed. Finally, through detailed theoretical analysis and numerical simulation, a formula for predicting the shear capacity of the VFS-SPSW was proposed with satisfactory accuracy. The investigation results of this study can provide valuable references for practical design and application of the VFS-SPSWs.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"218 ","pages":"Article 114049"},"PeriodicalIF":6.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267983","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}