Thin-Walled Structures最新文献_第2页

Magneto-elastic analysis of thin-walled superconducting solenoids 薄壁超导螺线管的磁弹性分析

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.tws.2026.114619

Dominik Pridöhl , Laurenz Klein , Kai-Uwe Schröder , Stefan Schael

The design of thin-walled superconducting solenoids for particle physics applications requires the consideration of magnet deformations due to self-induced magnetic forces. We present a reduced-order model for these bidirectional magneto-elastic interactions that exploits the inherent axisymmetry of the problem. The developed simulation code allows for the efficient calculation of stresses and deformations in thin-walled solenoids, as well as the magnetic field map of the deformed solenoid.

The simulation uses two coupled solvers: one for the structural and one for the electromagnetic domain. Magnetic field and Lorentz forces are calculated by a dedicated Biot–Savart solver. The structural solver is based on the Transfer Matrix Method (TMM) for shells of revolution. The coupled problem is solved iteratively by the solvers exchanging updated magnet forces and displacements for increasing current increments. This approach captures geometric non-linearities as well as the non-linear redistribution of magnetic forces due to deformations. The non-linear simulation capabilities are demonstrated by exemplary calculations of the BESS-Polar solenoid. We find deviations up to

\pm

1% in magnetic field caused by the solenoid’s deformations. Geometric non-linearity is found to have only a minor effect and may thus be neglected for the calculation of magnet deformations. In parametric studies, the magneto-elastic solver is shown to be an order of magnitude faster than commercial finite element solvers. The proven computational efficiency makes the tool well-suited for the preliminary structural design of superconducting solenoids and for the estimation of magneto-elastic effects in future particle physics experiments like AMS-100.

用于粒子物理应用的薄壁超导螺线管的设计需要考虑由于自感磁力引起的磁体变形。我们提出了一个双向磁弹性相互作用的降阶模型，利用了问题固有的轴对称。开发的仿真代码允许有效地计算薄壁螺线管的应力和变形，以及变形螺线管的磁场图。仿真使用两个耦合求解器：一个用于结构域，一个用于电磁域。磁场和洛伦兹力由专用的毕奥-萨瓦求解器计算。结构求解基于传递矩阵法（TMM）求解旋转壳。求解器通过交换磁体力和位移来增加电流增量来迭代求解耦合问题。这种方法捕获几何非线性以及由于变形引起的磁力的非线性再分布。非线性仿真能力通过BESS-Polar螺线管的示例计算证明。我们发现由螺线管变形引起的磁场偏差高达±1%。几何非线性的影响很小，因此在计算磁体变形时可以忽略不计。在参数化研究中，磁弹性求解器比商用有限元求解器快一个数量级。经过验证的计算效率使该工具非常适合超导螺线管的初步结构设计以及未来粒子物理实验（如AMS-100）中磁弹性效应的估计。

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引用次数: 0

An axisymmetric FEM–BEM method for the frequency and dynamic analysis of thin axisymmetric shells in axial flow 轴对称薄壳轴向流动的频率和动力分析的轴对称有限元-边界元法

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.tws.2026.114601

Dechun Zhang, Jiaxin Ji, Yupeng Zou, Yongjun Shi

The relative motion between the submersible and the fluid affects its dynamic behavior. This paper develops an efficient and applicable axisymmetric FEM–BEM method for the frequencies and dynamics of complex axisymmetric shells submerged in axial flow to systematically study this effect. Truncated conical and cylindrical segments discretize the thin axisymmetric shell, with motion expressed by axisymmetric elements. The energy method determines elemental mass and stiffness matrices and then obtains structural matrices. Based on the ideal fluid assumption, axisymmetric boundary elements determine the fluid forces, which are transformed into equivalent nodal forces to obtain fluid-added matrices and fluid–structure coupling equations. Then the system’s frequencies and responses are obtained through eigenvalue analysis and complex mode superposition methods, respectively. ANSYS and DQM results comprehensively validate the present method’s accuracy. The present method analyzed the simplified submersible model’s dynamics. Results show that the flow reduces system frequencies and damping, induces mode coupling, and affects responses. These effects are more significant for low-damping and thin shells. This paper first presents a method for the dynamics of complex axisymmetric shells in flow and it has significant potential for submersible design and response calculation in motion.

潜水器与流体之间的相对运动影响其动力特性。本文建立了一种高效适用的轴对称有限元-边界元法，对轴对称复杂壳在轴流中的频率和动力学进行了系统的研究。截短的锥形和圆柱形段将薄轴对称壳体离散化，运动用轴对称单元表示。能量法确定元素质量矩阵和刚度矩阵，得到结构矩阵。基于理想流体假设，由轴对称边界元确定流体力，并将其转化为等效节点力，得到加液矩阵和流固耦合方程。然后分别通过特征值分析和复模态叠加法得到系统的频率和响应。ANSYS和DQM实验结果全面验证了该方法的准确性。该方法分析了简化潜水器模型的动力学特性。结果表明，流动降低了系统频率和阻尼，诱发了模态耦合，影响了系统响应。对于低阻尼和薄壳，这些效应更为显著。本文首次提出了一种复杂轴对称壳在流动中的动力学计算方法，它对潜水器的设计和运动响应计算具有重要的潜力。

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引用次数: 0

Efficient numerical simulation of compression behaviour of SLA 3D printed cellular structures SLA 3D打印细胞结构压缩性能的高效数值模拟

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.tws.2026.114632

Konrad Siwek, Karolina Spychel, Michał Kucewicz, Paweł Baranowski

This study establishes a validated and computationally efficient numerical simulation framework for additively manufactured cellular structures. The research is based on a comprehensive experimental and numerical investigation of six 2D auxetic cellular topologies fabricated via stereolithography (SLA) using Formlabs durable V2 resin. While these topologies are documented in existing literature, this work addresses the critical gap between idealized models and the real world components printed via SLA. The primary contribution of this work is a rigorous parametric investigation consisting of six stages that quantifies the sensitivity of finite element results to (i) constitutive modeling, (ii) boundary conditions via a proposed quasi plane strain slice approach, (iii) loading conditions, (iv) element formulation, (v) friction properties, and (vi) geometric deviations from SLA process variability. Key results demonstrate that the response of cellular structures is highly sensitive to geometric deviations from the manufacturing process rather than the complexity of the material model. Specifically, changes in total volume between 87 % and 113 % of the nominal values caused shifts in absorbed energy by a factor of five. The study demonstrates an optimal time-efficient model configuration using a thin quasi plane-strain 2D slice which reproduce element expansion in Z-axis, coupled with a simple elasto-plastic model, and a loading described by the velocity ramp described with a sine-based function provided qualitative and quantitative agreement with experiments. The maximum error not exceeded ∼13 % for peak force and specific energy absorption. Overall, this study provides a robust practical guide for reliable, large-scale numerical assessment of SLA-printed 2D auxetic structures, bridging the gap between unit-cell analysis and full-topology optimization.

本研究建立了一个经过验证且计算效率高的增材制造细胞结构数值模拟框架。该研究是基于对使用Formlabs耐用V2树脂通过立体光刻（SLA）制备的六种二维缺失细胞拓扑结构的综合实验和数值研究。虽然这些拓扑在现有文献中有记录，但这项工作解决了理想模型和通过SLA打印的现实世界组件之间的关键差距。这项工作的主要贡献是一项严格的参数化研究，包括六个阶段，量化了有限元结果对(i)本构建模的敏感性，（ii）通过拟平面应变片方法获得的边界条件，（iii）加载条件，（iv）单元公式，(v)摩擦特性，以及（vi） SLA过程可变性的几何偏差。关键结果表明，细胞结构的响应对制造过程的几何偏差高度敏感，而不是材料模型的复杂性。具体来说，总体积在标称值的87%到113%之间的变化引起了吸收能量的五倍变化。该研究证明了一种最优的时间效率模型配置，该模型采用薄的准平面应变二维切片，再现了单元在z轴上的扩展，再加上简单的弹塑性模型，并且用正弦函数描述的速度斜坡描述的加载与实验相一致，定性和定量。峰值力和比能吸收的最大误差不超过~ 13%。总的来说，这项研究为可靠的、大规模的sla打印二维增氧结构数值评估提供了强大的实用指南，弥合了单元分析和全拓扑优化之间的差距。

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引用次数: 0

Cross-section compressive performance of wire arc additively manufactured stainless steel singly symmetric (T-shaped, channel and angle) section stub columns 丝弧增材制造不锈钢单对称（t型、槽型和角型）截面短柱的截面抗压性能

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.tws.2026.114618

Xinya Huang , Ziyi Wang , Yukai Zhong , Man-Tai Chen , Ou Zhao

Wire arc additive manufacturing (WAAM), a metal-based additive manufacturing process, has attracted growing attention in the construction industry due to its capability to produce large-scale metallic components in a cost-effective and resource-efficient manner. However, existing studies on the load-carrying behaviour of WAAM metallic structural components remain limited, which hinders their full exploitability and broad application in construction. To this end, an experimental investigation into the cross-section compressive performance of WAAM stainless steel singly symmetric (T-shaped, channel and angle) section stub columns is performed and presented in this paper. A total of fifteen stub column specimens (five specimens for each type of cross-section) were firstly fabricated, with their geometric properties measured through 3D laser scanning. Axial compression tests were then conducted, with the key test results reported in detail. Based on the experimental results, a design analysis was performed to evaluate the applicability of the European code and American specification for conventionally manufactured stainless steel T-shaped, channel and angle section stub columns to their WAAM stainless steel counterparts. The evaluation results showed that the slenderness limits, as specified in the European code and American specification, provided safe cross-section classification for WAAM stainless steel T-shaped, channel and angle sections. The European code and American specification were found to underestimate cross-section compressive resistances of WAAM stainless steel T-shaped, channel and angle section stub columns, with more conservative predictions observed for slender cross-sections.

电弧增材制造（WAAM）是一种基于金属的增材制造工艺，由于能够以经济高效和资源高效的方式生产大规模金属部件，在建筑行业引起了越来越多的关注。然而，目前对WAAM金属结构构件承载性能的研究还很有限，阻碍了WAAM金属结构构件在建筑中的充分开发和广泛应用。为此，本文对WAAM不锈钢单对称（t形、槽形和角形）截面短柱的截面压缩性能进行了试验研究。首先制作了15根短柱试件（每种截面5根），并通过三维激光扫描测量了它们的几何特性。然后进行了轴压试验，并详细报告了关键试验结果。在试验结果的基础上，进行了设计分析，评价了欧洲规范和美国规范对传统制造的不锈钢t形、槽形和角形截面短柱的适用性。评价结果表明，欧洲规范和美国规范规定的长细限值为WAAM不锈钢t型、槽型和角型截面提供了安全的截面分类。发现欧洲规范和美国规范低估了WAAM不锈钢t形、槽形和角形截面短柱的截面抗压能力，对细长截面的预测更为保守。

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引用次数: 0

Mechanical performance of triply periodic minimal surface (TPMS) lattices under multiple loading conditions 多载荷条件下三周期最小表面（TPMS）晶格的力学性能

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.tws.2026.114634

Na Qiu , Weilin Mou , Jie Yang , Cunyi Li , Jianguang Fang

Triply periodic minimal surface (TPMS) lattices have attracted significant attention for their lightweight and superior mechanical properties. However, limited research has addressed their performance under multiple loading conditions required for practical applications. This study aimed to address this gap by analyzing the mechanical properties, energy absorption capabilities, and fracture mechanisms of two TPMS structures—Gyroid (G) and Diamond (D)—under three-point bending, axial compression, and oblique compression. Experimental results showed that the G lattice consistently outperformed the D structure in energy absorption among all loading conditions. The superior mechanical performance of the G lattice compared to the D structure is attributed to its stable layer-by-layer deformation, which ensures a more uniform stress distribution. In contrast, the D structure's grid-like geometry resulted in more localized stress concentrations and reduced energy absorption, particularly under oblique and bending loads. Axial compression provided the highest energy absorption for both structures due to the effective engagement of their periodic unit cells, while three-point bending posed the most severe challenges, with fractures significantly reducing energy absorption efficiency. Simulation results revealed that medium stress triaxiality was the dominant trigger for damage initiation in both structures, with tensile stresses causing higher vulnerability due to lower fracture strain. The G structure exhibited more frequent damage initiation from mixed stress states, reflecting its complex stress interactions and superior load-bearing capabilities compared to the D structure. These findings enhance understanding of fracture mechanisms and provide valuable insights for optimizing the design of TPMS lattices to improve mechanical performance in practical applications.

三周期极小表面（TPMS）晶格以其轻量化和优异的力学性能而备受关注。然而，有限的研究已经解决了实际应用所需的多种载荷条件下的性能。本研究旨在通过分析两种TPMS结构- gyroid (G)和Diamond (D) -在三点弯曲、轴向压缩和斜向压缩下的力学性能、能量吸收能力和断裂机制来解决这一空白。实验结果表明，在各种加载条件下，G晶格的吸能性能始终优于D结构。与D结构相比，G晶格的优越力学性能归因于其稳定的逐层变形，从而确保了更均匀的应力分布。相比之下，D结构的网格状几何结构导致更多的局部应力集中和减少的能量吸收，特别是在倾斜和弯曲载荷下。轴向压缩为这两种结构提供了最高的能量吸收，因为它们的周期单元细胞有效地结合在一起，而三点弯曲带来了最严重的挑战，裂缝显著降低了能量吸收效率。模拟结果表明，中应力三轴性是两种结构损伤的主要触发因素，拉应力导致的脆性较高，断裂应变较低。与D结构相比，G结构表现出更频繁的混合应力状态损伤，反映了其复杂的应力相互作用和更强的承载能力。这些发现增强了对断裂机制的理解，并为优化TPMS晶格的设计以提高实际应用中的力学性能提供了有价值的见解。

{"title":"Mechanical performance of triply periodic minimal surface (TPMS) lattices under multiple loading conditions","authors":"Na Qiu , Weilin Mou , Jie Yang , Cunyi Li , Jianguang Fang","doi":"10.1016/j.tws.2026.114634","DOIUrl":"10.1016/j.tws.2026.114634","url":null,"abstract":"<div><div>Triply periodic minimal surface (TPMS) lattices have attracted significant attention for their lightweight and superior mechanical properties. However, limited research has addressed their performance under multiple loading conditions required for practical applications. This study aimed to address this gap by analyzing the mechanical properties, energy absorption capabilities, and fracture mechanisms of two TPMS structures—Gyroid (G) and Diamond (D)—under three-point bending, axial compression, and oblique compression. Experimental results showed that the G lattice consistently outperformed the D structure in energy absorption among all loading conditions. The superior mechanical performance of the G lattice compared to the D structure is attributed to its stable layer-by-layer deformation, which ensures a more uniform stress distribution. In contrast, the D structure's grid-like geometry resulted in more localized stress concentrations and reduced energy absorption, particularly under oblique and bending loads. Axial compression provided the highest energy absorption for both structures due to the effective engagement of their periodic unit cells, while three-point bending posed the most severe challenges, with fractures significantly reducing energy absorption efficiency. Simulation results revealed that medium stress triaxiality was the dominant trigger for damage initiation in both structures, with tensile stresses causing higher vulnerability due to lower fracture strain. The G structure exhibited more frequent damage initiation from mixed stress states, reflecting its complex stress interactions and superior load-bearing capabilities compared to the D structure. These findings enhance understanding of fracture mechanisms and provide valuable insights for optimizing the design of TPMS lattices to improve mechanical performance in practical applications.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"223 ","pages":"Article 114634"},"PeriodicalIF":6.6,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrosion resistance degradation of square stainless-clad bimetallic steel tubes in marine environments: Experiment, finite element modeling and theoretical analysis 海洋环境中方形不锈钢双金属钢管耐腐蚀性能退化：实验、有限元建模和理论分析

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-02-05 DOI: 10.1016/j.tws.2026.114620

Dong Li , Ziming Wang , Haoming Li , Hongwei Huang , Yuyue Chen , Chunjuan Zhou , Xiaoqiang Yang

Stainless-clad (SC) bimetallic steel tubes offer a cost-effective solution for marine structures, but their corrosion-induced mechanical degradation in the marine environment remains insufficiently studied. This study systematically investigates the axial compressive behavior of SC bimetallic steel tube under neutral salt spray corrosion conditions. Through 33 accelerated corrosion tests, 3D morphology reconstruction, and axial compression tests, the evolution patterns of corrosion damage and their impact on mechanical properties were revealed. The varying cladding ratios (β = 0, 0.1, 0.2), combined with accelerated salt spray corrosion times (0-60 days), were considered. Test results indicated that the ultimate load capacity of carbon steel (CS) specimens decreased by 12.7 % after 60 days of corrosion, while the reduction of SC bimetallic steel tubes was controlled within 5 %; the corrosion depth of SC specimens was approximately 75 % lower than that of CS specimens. A finite element model was developed, employing a coupled approach of uniform wall thinning and random pitting corrosion, which accurately predicted the buckling modes and load capacity degradation of corroded components. It indicated that pitting corrosion in the carbon steel substrate, following depletion of the cladding layer, causes a sharp reduction in load capacity—an effect mitigated by higher cladding ratios. The failure mode shifted accordingly: buckling is symmetric while corrosion only occurs in the cladding layer, and asymmetric local buckling with a single-wave peak is observed once pitting corrosion occurs. This study also proposes a modified model that accounts for material strength and cross-sectional damage, improving axial capacity predictions for square tubes in NSS (Neutral salt spray) environments and limiting errors to 4.32 % - 8.43 %.

不锈钢包层（SC）双金属钢管为海洋结构提供了一种经济有效的解决方案，但对其在海洋环境中腐蚀引起的机械退化的研究还不够充分。本文系统地研究了SC双金属钢管在中性盐雾腐蚀条件下的轴压行为。通过33次加速腐蚀试验、三维形貌重建和轴压试验，揭示了腐蚀损伤的演化规律及其对力学性能的影响。考虑了不同包层比（β = 0,0.1, 0.2）和加速盐雾腐蚀时间（0-60天）。试验结果表明，碳钢（CS）试样在腐蚀60天后的极限承载能力下降了12.7%，而SC双金属钢管的极限承载能力下降幅度控制在5%以内；SC试样的腐蚀深度比CS试样低约75%。采用均匀壁减薄和随机点蚀耦合的方法建立了腐蚀构件的有限元模型，准确预测了腐蚀构件的屈曲模式和承载能力退化。结果表明，在熔覆层耗尽后，碳钢基体的点蚀会导致载荷能力急剧下降，而较高的熔覆比可以减轻这种影响。失效模式发生了相应的转变：当腐蚀仅发生在熔覆层时，屈曲是对称的；当发生点蚀时，屈曲出现了单峰的不对称局部屈曲。该研究还提出了一个考虑材料强度和截面损伤的修正模型，改进了NSS（中性盐雾）环境中方管的轴向容量预测，并将误差限制在4.32% - 8.43%。

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引用次数: 0

Net section tensile behaviour of hot-rolled stainless-clad steel bolted connections – Test, modelling and design 热轧不锈钢包层螺栓连接的净截面拉伸性能。试验、建模和设计

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-02-05 DOI: 10.1016/j.tws.2026.114623

Jun-Zhi Liu , Peng Chen , Jia-Chen Guo , Hai-Ting Li , Fei Xu

Stainless-clad steel (SCS) is a high-performance composite material that combines the high strength of structural steel with the strong corrosion resistance of stainless steel. This paper examines the net section tensile behaviour of single-sided SCS (SSSCS) bolted connections under double shear. The cladding layer of SSSCS is made of 304 austenitic stainless steel, and the substrate material comes from Q235B mild steel. Both experimental tests and finite element analysis (FEA) were employed to study the failure mode and the deformation response of the bolted connections. The results demonstrated that all specimens failed by net section fracture and were able to attain their theoretical tensile resistance, with no debonding failure observed between two layers throughout tests. A comprehensive parametric analysis was further conducted to evaluate the effects of the connection edge distance, gauge distance, and the pitch distance on the net section tensile behaviour. The obtained test and FEA data were used to assess the applicability of existing design specifications. The findings indicate that the design equations in EN 1993-1-1:2022 and AISC 360-22 provide accurate, albeit slightly conservative, predictions for the net section tensile capacity of DSSCS bolted connections.

不锈钢复合钢（SCS）是一种高性能复合材料，它结合了结构钢的高强度和不锈钢的强耐腐蚀性。本文研究了双剪切作用下单面SCS （SSSCS）螺栓连接的净截面拉伸性能。SSSCS包层采用304奥氏体不锈钢，基材采用Q235B低碳钢。采用试验试验和有限元分析相结合的方法对螺栓连接的破坏模式和变形响应进行了研究。结果表明，所有试件均以净截面断裂破坏，并能够达到理论抗拉强度，在整个试验过程中未观察到两层之间的脱粘破坏。进一步进行了综合参数分析，以评估连接边距离、规距和节距对网截面拉伸性能的影响。获得的试验和有限元分析数据用于评估现有设计规范的适用性。研究结果表明，en1993 -1-1:2022和AISC 360-22中的设计方程对DSSCS螺栓连接的净截面拉伸能力提供了准确的预测，尽管有些保守。

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引用次数: 0

Experimental and multiscale finite element analysis of the shear behavior of pultruded-braided CFRP bars 拉编织CFRP筋抗剪性能试验及多尺度有限元分析

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-02-05 DOI: 10.1016/j.tws.2026.114621

Yue Liu , Ruixin Jia , Bin Liu , Shanchang Xu , Yingxuan Zhang , Mu Li

Pultruded carbon fiber reinforced polymer (CFRP) bars offer excellent longitudinal properties but are limited under complex stress states by their poor transverse shear resistance. To address this limitation, a braided architecture has been introduced to enhance structural integrity and shear capacity. In this study, the influence of braiding angles (±30°, ±45°, ±60°) on the shear behavior of pultruded-braided CFRP bars is systematically investigated through transverse shear tests, microscale characterization (micro-CT and SEM), and a multiscale finite element model. The results demonstrate that the braiding angle critically determines both the shear strength and failure mode. The ±30° configuration achieved the optimal performance, increasing the shear strength by 27% compared to conventional pultruded bars and inducing a fiber-dominated failure. In contrast, the ±60° configuration led to reduced performance, with failure governed by interfacial debonding and delamination due to inefficient fiber orientation. Parametric analysis further revealed that the transverse modulus (E₂₂) and in-plane shear modulus (G₁₂) of the braided layer are the dominant parameters affecting the peak load. Therefore, this work validates the pultrusion-braiding process as an effective strategy for improving the transverse performance of CFRP bars.

拉挤碳纤维增强聚合物（CFRP）棒材具有优良的纵向性能，但由于其横向抗剪能力差，在复杂应力状态下受到限制。为了解决这一限制，引入了编织结构来增强结构完整性和剪切能力。在本研究中，通过横向剪切试验、微尺度表征（micro-CT和SEM）和多尺度有限元模型，系统研究了编织角度（±30°、±45°和±60°）对拉挤编织CFRP筋剪切性能的影响。结果表明，编织角对土体的抗剪强度和破坏模式都有决定性的影响。±30°的配置达到了最佳性能，与传统的拉挤杆相比，抗剪强度提高了27%，并引起了纤维主导的破坏。相比之下，±60°的配置导致性能下降，由于纤维定向效率低下，界面脱粘和分层导致失效。参数分析进一步表明，编织层的横向模量（E₂₂）和面内剪切模量（G₁₂）是影响峰值荷载的主要参数。因此，本工作验证了拉挤编织工艺是提高CFRP筋横向性能的有效策略。

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引用次数: 0

Porosity–orthotropic foundation coupling in laminated cylindrical panels: Vibration and stability under non-uniform edge loads 层合圆柱板的孔隙-正交各向异性基础耦合：非均匀边缘荷载下的振动和稳定性

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-02-05 DOI: 10.1016/j.tws.2026.114615

Ferruh Turan , Furkan Can Bahadır , Muhammed Karadeniz

Laminated composite cylindrical panels are widely used in aerospace, marine, and civil structures due to their high strength-to-weight efficiency; however, their stability and vibration characteristics can be markedly altered by porosity, foundation interaction, and realistic non-uniform in-plane edge loadings. This study presents a unified vibration and buckling formulation for porous orthotropic laminated cylindrical panels resting on orthotropic Pasternak foundations and subjected to parabolic, sinusoidal, and linearly varying edge compressions. A higher-order shear deformation theory (HSDT) is adopted to capture transverse shear effects without shear correction factors, and porosity is represented through uneven through-thickness distributions. The pre-buckling stress resultants for non-uniform edge loads are obtained exactly via the Airy stress function, and the governing equations derived from Hamilton’s principle are reduced using the Galerkin method. The results demonstrate that the orthotropic Pasternak foundation substantially elevates both the fundamental frequency and the critical buckling load, with the maximum enhancement occurring when the foundation stiff axis is aligned with the panel longitudinal direction. Increasing porosity reduces stiffness and thus lowers the frequency and buckling resistance, whereas a sufficiently stiff foundation effectively compensates for this degradation. Moreover, increasing the material orthotropy ratio improves vibration performance but may reduce buckling capacity due to shear-dominated instability mechanisms. Finally, non-uniform edge compressions, particularly triangular distributions, can produce critical buckling loads up to two times those under uniform compression, underscoring the necessity of incorporating load non-uniformity and foundation orthotropy in reliable design.

层压复合材料圆柱板因其高强度重量比而广泛应用于航空航天、船舶和民用结构；然而，它们的稳定性和振动特性会受到孔隙率、基础相互作用和实际的非均匀面内边缘载荷的显著改变。本研究提出了基于正交异性帕斯捷尔纳克地基的多孔正交各向异性层压圆柱板的统一振动和屈曲公式，并对其进行了抛物线、正弦和线性变化的边缘压缩。采用高阶剪切变形理论（HSDT）捕捉横向剪切效应，不考虑剪切修正因子，孔隙度通过不均匀的透厚分布来表示。利用Airy应力函数精确地得到了非均匀边缘载荷的预屈曲应力结果，并利用伽辽金法对Hamilton原理导出的控制方程进行了约化。结果表明：正交各向异性帕斯捷尔纳克基础大大提高了基频和临界屈曲载荷，且在基础刚性轴与面板纵向对齐时提高最大；孔隙率的增加降低了刚度，从而降低了频率和抗屈曲能力，而足够坚硬的基础可以有效地补偿这种退化。此外，增加材料的正交异性比可以改善振动性能，但可能会由于剪切主导的失稳机制而降低屈曲能力。最后，非均匀边缘压缩，特别是三角形分布，可以产生高达均匀压缩下两倍的临界屈曲载荷，强调了在可靠设计中考虑载荷不均匀性和基础正交异性的必要性。

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引用次数: 0

Achieving tunable stiffness capacity in bi-stable composites via thin metal hybridization 通过薄金属杂化实现双稳态复合材料的可调刚度

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-02-04 DOI: 10.1016/j.tws.2026.114617

Xiangwei Guo , Shibo Guo , Shiqi Dong , Fuhong Dai

Bi-stable composite structures, known for their adaptive functionality and ability to deform between two stable states, are widely used in intelligent structures and aerospace applications. Traditionally, the configuration of such structures is controlled by adjusting layer thickness and orientation. However, increasing the thickness can make it more difficult to switch between states. This paper proposes a thin-metal hybridization strategy to control bi-stable behavior via interfacial stress engineering. By strategically positioning these metal (three typical layers), the study demonstrates effective control over both the structural configuration and stiffness capacity. Additionally, without altering the overall dimensions, mass, or thickness, the configuration and snap-though and snap-back behavior can also be influenced by the initial diameter of the shell. The addition of metal layers increases the thickness by only 9%, yet it significantly enhances the control performance. The findings of this research hold considerable application value for the design of intelligent structures and aerospace components based on bi-stable composites.

双稳态复合材料结构以其自适应功能和在两种稳定状态之间变形的能力而闻名，广泛应用于智能结构和航空航天领域。传统上，这种结构的结构是通过调节层厚度和方向来控制的。然而，增加厚度会使状态之间的切换变得更加困难。本文提出了一种通过界面应力工程控制双稳行为的薄金属杂化策略。通过战略性地定位这些金属（三个典型层），研究证明了对结构配置和刚度能力的有效控制。此外，在不改变总体尺寸、质量或厚度的情况下，壳体的初始直径也会影响结构和弹通和弹回行为。金属层的加入只增加了9%的厚度，但它显著提高了控制性能。研究结果对基于双稳态复合材料的智能结构和航空航天部件的设计具有重要的应用价值。

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