Thin-Walled Structures最新文献

{"title":"Flexural behaviour of a novel thin-walled UHPC composite sandwich insulated wall panel–Experimental and theoretical investigations","authors":"Yu Bian ,&nbsp;Feng Xiong ,&nbsp;Ye Liu ,&nbsp;Huanlong Ding ,&nbsp;Yi Liao","doi":"10.1016/j.tws.2026.114521","DOIUrl":"10.1016/j.tws.2026.114521","url":null,"abstract":"<div><div>To fully exploit the integrated structural and thermal advantages of precast concrete sandwich insulation panel, this paper proposes a new thin-walled ultra-high-performance concrete (UHPC) composite sandwich insulated wall panel (UCSP). The inner and outer wythes are each made of 20 mm thick UHPC, and anchorage-reinforced and connection-reinforced zones are arranged within the wythes. Experimental studies were conducted on the in-plane shear response and flexural response of UCSPs, comparing the effects of different inter-wythe connection schemes on panel performance. The results show that the flexural failure modes of UCSPs can be categorized into wythe failure and connection-system failure. When the peak shear load of the connection system increased by 29%, the degree of composite action improved by 15% in the elastic stage and 21% in the ultimate stage. For UCSPs with wythe through ribs, their flexural performance was close to that of a sandwich panel under the fully composite limit state. As the connection spacing was reduced by 50%, the flexural stiffness, peak load, and ductility of the UCSP increased by at least 31%, 25%, and 15%, respectively. Although UCSP reduced its self-weight by approximately 60% compared to conventional concrete sandwich panels, it could still withstand a uniformly distributed load of at least 5.4 kN/m² before cracking and exhibited deformation greater than 1/150 of its span at failure, demonstrating its excellent flexural performance. Finally, theoretical calculation models for the flexural bearing capacity and deformation of UCSP were established and verified against the test results. Overall, UCSP overcome the application difficulties of PCSPs in both nonstructural and structural roles.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114521"},"PeriodicalIF":6.6,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981180","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 invariant-based strain rate-dependent inelastic deformation model for unidirectional fiber-reinforced composite materials: Model development and finite element implementation","authors":"Khizar Rouf,&nbsp;Michael Worswick,&nbsp;John Montesano","doi":"10.1016/j.tws.2026.114517","DOIUrl":"10.1016/j.tws.2026.114517","url":null,"abstract":"<div><div>A new invariant-based anisotropic constitutive model is developed and implemented in finite element software via a user-defined material subroutine to predict the strain rate-dependent inelastic deformation response of unidirectional fiber-reinforced composites. A non-associated flow rule captures the evolution of plastic strains, while strain rate-dependency is incorporated using logarithmic scaling functions. The proposed yield function allows for a simplified calibration process that relies solely on standard uniaxial tests, eliminating the need for more complex biaxial or off-axis tests. The ability of the model to predict the pre-peak inelastic response is validated with experimental results for an off-axis unidirectional tape composite and multidirectional laminates comprising unidirectional non-crimp fabric composite plies under quasi-static and high strain rates. The model accurately captures the elastic and inelastic responses of the off-axis unidirectional laminae, with deviations remaining below 10% across most evaluated cases. For multidirectional laminates, the strain rate-dependent effective response is predicted with good accuracy for the symmetric angle-ply laminates, with percentage differences of approximately 1% under quasi-static loading and 4<strong>–</strong>5% under high strain-rate conditions. For multidirectional laminates where local delamination initiates, the model predictions begin to deviate from the experimental data given that the current formulation does not yet consider such damage mechanisms. Overall, these results demonstrate that the constitutive model is well-suited for predicting the pre-peak anisotropic, strain rate-dependent responses of composite laminates.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114517"},"PeriodicalIF":6.6,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038902","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":"Cooling method effects on post-fire performance of steel storage rack connections","authors":"Fatih Mehmet Özkal ,&nbsp;Betül Aliş ,&nbsp;Casim Yazici","doi":"10.1016/j.tws.2026.114520","DOIUrl":"10.1016/j.tws.2026.114520","url":null,"abstract":"<div><div>Steel storage rack systems rely critically on semi-rigid beam-to-column connections (BCCs), which govern the global stability and seismic resilience of the structure. Despite their importance, a notable research gap persists regarding the residual performance and structural integrity of these connections following fire exposure and subsequent cooling. This study provides the first systematic connection-level experimental evaluation of how different cooling methods influence the post-fire performance of BCCs in steel storage rack systems. A comprehensive test program was conducted on specimens exposed to elevated temperatures ranging from 23°C to 800°C. Four distinct cooling protocols were applied, simulating practical extinguishing scenarios: air cooling (AC), fire-fighting foam cooling (FC), water spray cooling (SC), and water immersion cooling (WC). The residual moment-rotation behavior, moment resistance, rotational stiffness, rotational capacity, and ductility of the connections were systematically evaluated. The results demonstrated that all structural performance parameters decreased with rising exposure temperature, with accelerated degradation typically observed above 500–600°C. Gradual cooling methods (AC and FC) were the most effective, preserving a superior combination of strength and deformation capacity across the temperature range. Conversely, rapid water-based cooling (SC and WC) caused more substantial reductions in ultimate moment capacity. Although water immersion (WC) maintained numerically higher rotational stiffness at elevated temperatures, WC specimens exhibited a significant loss of ductility and rotational capacity compared to AC and FC, indicating a more brittle post-fire behavior. The findings emphasize that post-fire evaluation must account for the loss of ductility and the increased risk of brittle fracture associated with rapid quenching. In addition, cooling-dependent reduction factors and practical post-fire assessment recommendations are proposed, providing a direct engineering framework. This study provides crucial data for the structural assessment, repair decisions, and safe reuse determination of cold-formed steel rack components after a fire event.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114520"},"PeriodicalIF":6.6,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981094","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":"Buildability analysis of 3D concrete printing: a finite element model incorporating segment-by-segment activation, nozzle constraint, and extrusion pressure","authors":"Tao Ding,&nbsp;Hongqian Lian","doi":"10.1016/j.tws.2026.114523","DOIUrl":"10.1016/j.tws.2026.114523","url":null,"abstract":"<div><div>Accurate evaluation of 3D concrete printing (3DCP) buildability is critical for quality assurance and continuous construction. However, existing numerical models for 3D 3DCP struggle to simultaneously capture the full structural-scale behavior and realistic portrayal of the printing process, limiting predictive accuracy. While fluid-like material models, exemplified by computational fluid dynamics (CFD), accurately simulate the printing process, they are computationally prohibitive for large-scale structures. Conversely, solid-like material models utilizing typical element activation strategy in finite element analysis (FEA) efficiently predict structural performance but inadequately represent the printing process. To bridge this gap between simulation efficiency and process fidelity, this study proposes a finite element framework incorporating the Drucker-Prager (D-P) model with a segment-by-segment activation strategy, dynamic nozzle constraint, and extrusion pressure effects to simulate full-scale printing processes with enhanced fidelity. The innovation lies in modeling nozzle-induced constraints on newly extruded material to reduce positional deviations during segment activation and explicitly accounting for extrusion pressure on underlying layers. Compared to experimental and numerical results of three typical 3DCP structures (thin-walled cylinders and straight thin wall) reported in the literature, this model exhibits an 8.4%-26.7% reduction (thin-walled cylinders) in prediction error for experimental failure layers compared to literature methods. Furthermore, it accurately captures asymmetric collapse of Cylinder 1 and elastic buckling due to one end out-of-plane deformation of straight thin wall. This framework provides a robust tool for optimizing 3DCP parameters and advancing engineering applications.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114523"},"PeriodicalIF":6.6,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038900","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":"Experimental performance of CFST K-joints under combined sustained load and chloride corrosion","authors":"Guiming Liang ,&nbsp;Chao Hou ,&nbsp;Zhan-Shuo Liang ,&nbsp;Lin-Hai Han","doi":"10.1016/j.tws.2026.114515","DOIUrl":"10.1016/j.tws.2026.114515","url":null,"abstract":"<div><div>This study experimentally investigates the mechanical degradation of concrete-filled steel tubular (CFST) K-joints under the combined effects of sustained load and chloride corrosion, a critical scenario in offshore and marine applications for which research remains limited. A series of 13 tubular K-joints, including 11 specimens with CFST chords and 2 with circular hollow section (CHS) chords, are first subjected to combined sustained load and accelerated corrosion tests, and are then tested to determine their ultimate capacity under typical static boundary conditions. The effects of geometric parameters, corrosion damage degrees, and sustained load ratios on the performance of CFST K-joints are analyzed. The study reveals, within the tested parameter ranges, that sustained loading contributes to non-negligible performance degradation by promoting creep in the concrete core and therefore inducing steel-concrete stress redistribution, which then results in variation in the joint stiffness. The influence of sustained loading becomes more pronounced when the chord wall thickness decreases. Moreover, corrosion is identified as the primary factor in performance degradation, because it reduces brace wall thickness and effective cross-sectional area and ultimately causes a 36.2% decrease in ultimate capacity as well as a 48.4% loss in initial stiffness. Based on these findings, a formula for calculating the residual bearing capacity of CFST K-joints is proposed, which can provide theoretical support for the service life assessment and safety design of CFST K-joints in harsh marine environments.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114515"},"PeriodicalIF":6.6,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981759","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":"Anti-impact topology optimization for 2D and shell-based structures based on velocity field level set method with response spectrum analysis","authors":"Ruijiao Liu,&nbsp;Yunlong Chen,&nbsp;Changhe Wang,&nbsp;Xiaopeng Zhang,&nbsp;Yaguang Wang,&nbsp;Zhan Kang","doi":"10.1016/j.tws.2026.114506","DOIUrl":"10.1016/j.tws.2026.114506","url":null,"abstract":"<div><div>Anti-impact design is of significant importance in various areas, particularly in the naval equipment and architecture. Advanced structural optimization techniques can offer powerful and efficient tools to achieve innovative configurations with extraordinary performances. This paper proposes a velocity field level set topology optimization method for anti-impact structural design using the response spectrum analysis. A multi-objective optimization formulation combined with the structural compliance and the spectrum compliance is presented, which effectively balances load-bearing capacity and impact resistance enhancement. Here the response spectrum analysis is used to evaluate the anti-impact performances efficiently while avoiding the complexity and high cost of time-domain integration. In the sensitivity analysis, the optimization problem is reformulated into a self-adjoint form through modal superposition, which eliminates the need to solve additional adjoint equations and significantly reduces computational complexity. The optimization is performed in the velocity field level set framework, which allows using a general optimizer (such as the MMA algorithm) to handling constraints steadily and efficiently. Meanwhile, the clear and smooth boundary representation is combined with the body-fitted mesh technology, which enhances the accuracy of the mechanical response calculation and facilitate the manufacturability of the optimization results.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114506"},"PeriodicalIF":6.6,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038993","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":"Temperature-dependent mechanical properties and crashworthiness of foam-filled spiral tube","authors":"Geng Luo ,&nbsp;Zhaofei Zhu ,&nbsp;Jieqiong Zhang ,&nbsp;Yike Wang ,&nbsp;Pu Xue ,&nbsp;Yisong Chen","doi":"10.1016/j.tws.2026.114510","DOIUrl":"10.1016/j.tws.2026.114510","url":null,"abstract":"<div><div>Thin-walled structures are widely employed in engineering protection at diverse environmental temperatures because of their superior energy-absorption capacity. This study developed a foam-filled spiral tube (FFST) to further improve the crashworthiness of thin-walled structures and systematically investigated its temperature-dependent mechanical behavior and energy-absorption characteristics. A combined experimental-numerical approach was adopted: finite-element models based on Voronoi diagrams were validated through quasi-static tests in a temperature chamber (−20 to 45 °C), followed by a parametric analysis. The results indicated that low temperatures increased the brittleness of the foam, leading to cell-wall fracture and lateral shear deformation. As the temperature increased, the deformation mode transitioned to plastic-hinge-dominated buckling, followed by stable layer-by-layer compaction. When the temperature increased from −20 to 45 °C, the specific energy absorption (<em>SEA</em>) decreased by 76.7 %, while the ultimate load-carrying capacity (<em>ULC</em>) decreased by 45.8 %. These findings demonstrate that although elevated temperatures reduce the energy-absorption capacity of the foam, they improve the smoothness of the deformation process and enhance the stability of the energy-absorption performance. For spiral tubes (STs), small amplitudes and long wavelengths induce asymmetric, unstable deformation, whereas increasing the amplitude or reducing the wavelength improves the geometric stability. Elevated temperatures reduce structural strength and <em>SEA</em>, and STs with small corrugation parameters exhibit temperature-sensitive load capacities owing to their potential for thermal instability. Foam filling enhances the <em>SEA</em> but may exacerbate the deformation instability of small-parameter STs at high temperatures. Geometric optimization can offset foam performance degradation and improve crashworthiness. The interaction analysis revealed that at low temperatures, foam protrusions enhanced interlocking, whereas at high temperatures, sliding friction dominated and diminished the energy contribution. Larger amplitudes stabilize axisymmetric crushing but limit foam penetration, whereas longer wavelengths increase the contact area but may aggravate global instability under volumetric expansion. These findings clarify the temperature-dependent deformation mechanisms and foam-tube interactions of the FFST and offer theoretical guidance for the design of temperature-adaptive energy-absorbing structures.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114510"},"PeriodicalIF":6.6,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981761","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":"Low-velocity impact response and energy absorption of T800 CFRP/Stainless-steel ultra-thin strip composite tubes","authors":"Zhuhaoyan Wang ,&nbsp;Longhui He ,&nbsp;Xiaoqiong Zhang ,&nbsp;tingting zhang ,&nbsp;Tao Wang ,&nbsp;Qingxue Huang","doi":"10.1016/j.tws.2026.114509","DOIUrl":"10.1016/j.tws.2026.114509","url":null,"abstract":"<div><div>To overcome the limitation of conventional fiber metal composite tubes (FMCTs) in achieving further lightweight design without compromising impact resistance and energy absorption, this study proposes a novel thin-walled multilayer structure—carbon fiber/stainless-steel ultra-thin strips fiber metal composite tube (CSFMCT). CSFMCT specimens (80 mm and 120 mm) were fabricated via roll-forming and hot-press curing, and subjected to axial and transverse low-velocity impact tests. The dynamic response, failure mechanisms, and energy dissipation behaviors were systematically analyzed with high-speed imaging, SEM, and XCT. Comparative tests with CFRP and Al tubes were also conducted to assess performance differences. Results show that with axial impact (100–400 J), the CSFMCT peak load rose by 41% and displacement by 72%. Under transverse impact (40–80 J), the peak load increased by 36% and the displacement by 31%. The CSFMCT dissipates energy through the sequential coordination of fiber brittle fracture with the shear failure and plastic deformation of the steel strips, accompanied by delamination between the fiber and steel strip layers, thereby achieving a stepwise and progressive energy dissipation process. Compared with CFRP and Al tubes, CSFMCT exhibits superior performance: its impact load is 21% higher than CFRP in the axial direction and 10% higher transversely. In terms of energy absorption, the axial EA of CSFMCT is on average 17.3 J higher than that of Al, with SEA 9% higher; under transverse loading, the EA is 8% higher and SEA 30% higher. These results demonstrate the strong potential of CSFMCT as a lightweight, high-performance energy-absorbing structure.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114509"},"PeriodicalIF":6.6,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981766","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":"Experimental investigation of cold-formed stainless steel tubular T-joints with and without reinforcement in the chord sidewall","authors":"Felipe B. Coutinho ,&nbsp;André T. da Silva ,&nbsp;Monique C. Rodrigues ,&nbsp;Luciano R.O. de Lima","doi":"10.1016/j.tws.2026.114516","DOIUrl":"10.1016/j.tws.2026.114516","url":null,"abstract":"<div><div>This study experimentally examined the structural behaviour of cold-formed tubular T-joints, with and without chord lateral sidewall reinforcement, to assess the effectiveness of reinforcement in enhancing joint resistance, focusing on stainless steel configurations with equal-width chord and brace members that are not considered in the main international design codes. A total of fifteen specimens were tested under axial compression of the brace, including variations in section dimensions and reinforcement plate thicknesses. The results demonstrated that the presence of a chord sidewall reinforcement plate significantly improved the ultimate capacity, with increases of up to 74% in the most slender configurations and approximately 55% in the more compact joints when the reinforcement plate thickness was doubled. It was observed that unreinforced joints failed at the chord sidewall, whereas the inclusion of a reinforcement plate altered the failure location, shifting it to the brace in cases where the chord had a less slender section. This indicates the reinforcement’s influence on the governing failure mechanism. The deformation-based failure criterion previously proposed for carbon steel joints - defined by an indentation of 3%<em>b₀</em> on the chord face – was found to be applicable to cold-formed stainless steel T-joints, both with and without reinforcement. Additionally, a new secondary criterion – based on a 5%<em>h₀</em> chord sidewall deformation, as suggested by previous studies – was proposed. When comparing the experimental results with the existing formulation, it was found that the resistance of unreinforced configurations was underestimated, a tendency consistent with the fact that the main design equations were derived and calibrated for carbon steel T-joints. In contrast, for reinforced T-joints, current design equations significantly overestimated the joint capacity, since they assume that resistance increases proportionally with reinforcement thickness by simply replacing the chord sidewall thickness with the sum of the chord and reinforcement plate thicknesses. These outcomes demonstrate that the design assumptions currently adopted for carbon steel joints are not applicable to stainless steel T-joints, emphasising the need to reconsider current design approaches for stainless steel tubular joints.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114516"},"PeriodicalIF":6.6,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039072","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":"Tuning asymmetric domes in thin-walled composite pressure vessels for enhanced burst strength","authors":"Honghao Liu ,&nbsp;Lei Zu ,&nbsp;Qian Zhang ,&nbsp;Guiming Zhang ,&nbsp;Jianhui Fu ,&nbsp;Helin Pan ,&nbsp;Qiaoguo Wu ,&nbsp;Xiaolong Jia ,&nbsp;Guojun Lu ,&nbsp;Lichuan Zhou","doi":"10.1016/j.tws.2026.114514","DOIUrl":"10.1016/j.tws.2026.114514","url":null,"abstract":"<div><div>Thin-walled composite pressure vessels are widely used in energy storage owing to outstanding mechanical performance. However, asymmetric domes with large polar openings cause stress concentration and defect accumulation, leading to premature failure under low internal pressure. In this study, an asymmetric-dome tuning strategy is proposed for composite pressure vessels to suppress crack initiation and optimize load-transfer paths, and an asymmetric coefficient is introduced to quantify how geometric asymmetry affects stress redistribution and structural performance. The results indicate that increasing the boss ratio of back domes decreases the asymmetric coefficient and reduces end stresses, thereby delaying crack initiation and enhancing burst strength. In contrast, increasing the ellipsoid ratio of front domes elevates the coefficient and smooths meridional load-transfer paths, transforming failure from abrupt local tearing to progressive global rupture. A moderate increase in the front-dome polar opening ratio promotes stiffness balance and keeps the asymmetric coefficient within a favorable range, while coordinated tuning of the two domes under a fixed back-dome polar opening ratio produces the most favorable burst-strength outcome. These findings not only clarify the governing influence of geometric asymmetry on failure-mode transition but also provide practical guidance for designing lightweight and reliable composite pressure vessels.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114514"},"PeriodicalIF":6.6,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981184","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}