Thin-Walled Structures最新文献_第9页

Mechanical performance of steel tube confined UHPC subjected to blast loading 爆炸荷载作用下钢管约束超高性能混凝土的力学性能

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-04-01 Epub Date: 2026-02-02 DOI: 10.1016/j.tws.2026.114608

Yuzhou Zheng , Haoze Li , Xisong Shan , Hengbo Xiang , Qin Fang , Chang Zhou

To improve the blast resistance of concrete-filled steel tubular (CFST) and take full advantages of superior compressive strength and energy dissipation capacity of UHPC, the explosion test and numerical simulation of steel tube confined UHPC (STCU) columns were carried out. The dynamic response characters including the overpressure-time history curves, displacement-time history curves, and failure modes of the test specimens were measured. The test results indicated that the STCU columns primarily exhibit overall bending failure under blast loading without significant local buckling or cratering observed. To further investigate the blast response of the STCU columns, the finite element model incorporating S-ALE algorithm for fluid-structure interaction modelling was established and validated by the test data. The influence of slenderness ratio, axial compression ratio, scaled distance, and pre-damage degree on the blast response was systematically analyzed. Results show that peak displacement increases with the slenderness ratio (27.71–103.93) and axial compression ratio (above 0.34), while it decreases as scaled distance increases (0.19–1.86 m/kg^1/3). Pre-damage significantly amplifies the displacement amplification factor (DAFδ) under secondary blast loading when the initial scaled distance Z₁ < 0.5 m/kg^1/3. The failure mode transitions from local buckling at very small scaled distances (0.19–0.32 m/kg^1/3) to overall bending at larger distances (0.46 m/kg^1/3). These findings clearly demonstrate how both structural parameters and loading conditions jointly govern the blast resistance and dynamic behavior of STCU columns.

为了提高钢管混凝土（CFST）的抗爆性能，充分利用钢管混凝土（UHPC）优越的抗压强度和耗能能力，对钢管承压UHPC （STCU）柱进行了爆炸试验和数值模拟。测试了试件的超压-时程曲线、位移-时程曲线和破坏模式等动态响应特性。试验结果表明，STCU柱在爆炸荷载作用下主要表现为整体弯曲破坏，未观察到明显的局部屈曲或爆坑。为了进一步研究STCU柱的爆炸响应，建立了基于S-ALE算法的流固耦合建模有限元模型，并通过试验数据进行了验证。系统分析了长细比、轴压比、尺度距离和预损伤程度对爆破响应的影响。结果表明：峰值位移随长细比（27.71 ~ 103.93）和轴压比（0.34以上）的增大而增大，随尺度距离的增大而减小（0.19 ~ 1.86 m/ kg3 /3）；当初始尺度距离Z₁<； 0.5 m/kg1/3时，预损伤显著放大了二次爆炸载荷下的位移放大系数（DAFδ）。破坏模式由小尺度距离下的局部屈曲（0.19 ~ 0.32 m/kg1/3）转变为大尺度距离下的整体弯曲（0.46 m/kg1/3）。这些发现清楚地表明，结构参数和荷载条件如何共同影响STCU柱的抗爆性能和动力性能。

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引用次数: 0

Experimental investigation of 6061-T6 aluminium alloy CHS stub columns under transient fire conditions considering intumescent coatings 考虑膨胀涂层的6061-T6铝合金CHS短柱瞬态火灾试验研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-08 DOI: 10.1016/j.tws.2026.114507

Zhongxing Wang , Yifan Wang , Lele Zhan , Shijia He , Boshan Chen

This study investigated the local buckling behaviour of aluminium alloy circular hollow section (CHS) stub columns under transient fire conditions, with a particular focus on the effects of intumescent coating. A total of 18 experimental tests were conducted, including four tests at room temperature, eight under high-temperature transient conditions without fire protection, and six under similar conditions with intumescent coating. Prior to the stub column tests, the material properties of the 6061-T6 aluminium alloy at room temperature were obtained through the tensile coupon tests, and the initial geometric imperfections of the stub columns were measured using a 3D laser scanner. The load-end shortening behaviour, failure modes, critical temperatures, and the effectiveness of intumescent coatings were investigated in this study. The test results revealed a distinct contrast in failure modes: under ambient conditions, all stub column specimens exhibited elephant-foot-type local buckling at the ends, whereas under unprotected, high-temperature transient conditions, local buckling occurred at mid-height. Based on the experimental results, the applicability and accuracy of Chinese Code (T/CECS 756–2020) and European Standard (EN 1999–1–1) (2007) were evaluated, and the results revealed that existing design provisions underestimate the load-bearing capacity of such aluminium alloy stub columns at elevated temperatures. To address this, a preliminary empirical formula based on modified European Standard (EN1993–1–2) (2005) was developed for accurately determining the critical temperature of aluminium alloy stub columns under fire conditions.

本文研究了铝合金圆空心截面（CHS）短柱在瞬态火灾条件下的局部屈曲行为，特别关注了膨胀涂层的影响。共进行了18次试验试验，其中常温试验4次，无防火高温瞬态试验8次，有膨胀涂层的相似工况试验6次。在短柱试验之前，通过拉伸试验获得了6061-T6铝合金在室温下的材料性能，并利用三维激光扫描仪测量了短柱的初始几何缺陷。本研究对膨胀涂层的载荷端缩短行为、失效模式、临界温度和有效性进行了研究。试验结果揭示了破坏模式的鲜明对比：在环境条件下，所有短柱试件在末端表现出象脚型局部屈曲，而在无保护的高温瞬态条件下，局部屈曲发生在中高度。基于试验结果，对中国规范（T/CECS 756-2020）和欧洲标准（EN 1999-1-1）（2007）的适用性和准确性进行了评价，结果表明，现有设计规定低估了此类铝合金短柱在高温下的承载能力。为了解决这个问题，根据修改后的欧洲标准（EN1993-1-2）（2005），开发了一个初步的经验公式，用于准确确定铝合金短柱在火灾条件下的临界温度。

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引用次数: 0

Influence of curing-induced residual stress on structural and joint strength of magnesium alloy–carbon fiber composite casing 固化残余应力对镁合金-碳纤维复合材料套管结构和接头强度的影响

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-04-01 Epub Date: 2026-02-01 DOI: 10.1016/j.tws.2026.114605

Yankun Yang , Kai Yang , Quan Shi , Hong Zhang , Xiangying Hou

The residual stress generated during the curing process affects the mechanical properties of composite materials. To obtain the curing-induced residual stress (CRS) distribution in the casing and study its influence on static response under loads, a multi-field coupled analysis model was established. This model first simulates curing process to obtain the CRS distribution in composite part of casing. Subsequently, static analysis is conducted by introducing the CRS as initial stress. The adhesive–mechanical joints in casing are modeled using a cohesive zone model (CZM) and fastener modeling. This method enables the simulation of mechanical behavior of casing under multiaxial loading while accounting for the influence of CRS. The model was applied to analyze the static response of casing and investigate the effects of CRS on structural and joint strength. The damage behavior of adhesive layer was obtained, and the surface strain of composite part was measured experimentally. Due to the superimposition and cancellation effects between CRS and external loads in different zones of the composite part, both location and magnitude of stress concentration in composite part have changed after bearing the loads. Without considering CRS, stress concentration occurs in Zone A of composite part, with a stress level of approximately 175 MPa. When CRS are considered, the stress level in this region decreases to 140 MPa, while the stress level in Zone B increases from 115 MPa to 145 MPa.

固化过程中产生的残余应力影响复合材料的力学性能。为了获得套管内固化残余应力分布，研究其对载荷作用下静响应的影响，建立了多场耦合分析模型。该模型首先对固化过程进行了模拟，得到了套管复合部分的CRS分布。随后，引入CRS作为初始应力进行静力分析。采用粘接区模型（CZM）和紧固件模型对套管中的粘接-机械接头进行了建模。该方法能够在考虑CRS影响的情况下模拟多轴载荷作用下套管的力学行为。应用该模型分析了套管的静力响应，研究了CRS对套管结构和接头强度的影响。研究了粘接层的损伤行为，并对复合材料零件的表面应变进行了实验测量。由于复合材料部件不同区域的CRS与外载荷的叠加抵消作用，复合材料部件受力后应力集中的位置和大小都发生了变化。在不考虑CRS的情况下，复合件A区出现应力集中，应力水平约为175 MPa。考虑CRS时，该区域应力水平降低到140 MPa，而B区应力水平从115 MPa增加到145 MPa。

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引用次数: 0

Anti-impact topology optimization for 2D and shell-based structures based on velocity field level set method with response spectrum analysis 基于响应谱分析的速度场水平集方法的二维和壳基结构抗冲击拓扑优化

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-10 DOI: 10.1016/j.tws.2026.114506

Ruijiao Liu, Yunlong Chen, Changhe Wang, Xiaopeng Zhang, Yaguang Wang, Zhan Kang

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.

抗冲击设计在各个领域都具有重要意义，特别是在海军设备和建筑中。先进的结构优化技术可以提供强大而有效的工具，以实现具有非凡性能的创新配置。提出了一种基于响应谱分析的抗冲击结构速度场水平集拓扑优化方法。提出了一种结合结构柔度和频谱柔度的多目标优化公式，有效地平衡了承载能力和抗冲击能力的增强。本文采用响应谱分析方法有效地评价了结构的抗冲击性能，同时避免了时域积分的复杂性和高成本。在灵敏度分析中，通过模态叠加将优化问题重新表述为自伴随形式，从而消除了求解附加伴随方程的需要，大大降低了计算复杂度。优化是在速度场水平集框架中执行的，该框架允许使用通用优化器（如MMA算法）稳定有效地处理约束。同时，将清晰光滑的边界表示与贴体网格技术相结合，提高了机械响应计算的精度，有利于优化结果的可制造性。

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引用次数: 0

Viscoelastic damping design - Experimental analysis of optimized constrained layer damping treatments at different ambient temperatures 粘弹性阻尼设计。不同环境温度下优化约束层阻尼处理的实验分析

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-20 DOI: 10.1016/j.tws.2026.114563

Martin Gröhlich , Marc Böswald , Jörg Wallaschek

Constrained Layer Damping (CLD) is an established technology for passive vibration damping. Vibrational energy is dissipated by forcing a viscoelastic material into shear strain. However, the damping performance of CLD treatments is highly dependent on the temperature and the design of such structures can be tailored to operational conditions.

This paper presents an experimental analysis of shape-optimized CLD treatments over a temperature range from -20 °C to +20 °C. The samples were designed and manufactured with respect to maximum damping of the first bending mode at minimum and maximum temperature. Eigenfrequencies and damping ratios identified from a modal test in a climatic chamber are compared with those obtained from numerical simulations. The comparison shows a good correlation of the modal parameters. The results demonstrate that using the widths of virtually segmented core and face layers as design parameters is a valid approach for shape optimization of CLD treatments. Furthermore, it is proven that the optimal shape of a CLD treatment is temperature-dependent and that its damping performance varies with the ambient temperature condition.

约束层阻尼（CLD）是一种成熟的被动阻尼技术。振动能量是通过使粘弹性材料产生剪切应变而耗散的。然而，CLD处理的阻尼性能高度依赖于温度，这种结构的设计可以根据操作条件进行定制。本文介绍了在-20°C至+20°C温度范围内形状优化的CLD处理的实验分析。在最低和最高温度下，根据第一弯曲模态的最大阻尼来设计和制造样品。从气候室的模态试验中确定的特征频率和阻尼比与数值模拟得到的特征频率和阻尼比进行了比较。对比表明，模态参数具有良好的相关性。结果表明，采用虚拟分段的芯层和面层宽度作为设计参数是一种有效的CLD处理形状优化方法。此外，还证明了CLD处理的最佳形状与温度有关，并且其阻尼性能随环境温度条件而变化。

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引用次数: 0

Effects of column design variations on seismic performance of steel moment-resisting frames with fuse connections 柱型设计变化对保险丝连接钢抗弯矩框架抗震性能的影响

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-20 DOI: 10.1016/j.tws.2026.114565

Sangwook Park , Joseph Gilroy , Patricia Clayton , Alex Dundore , Sebastian Acevedo

Fuse connections featuring replaceable components that yield before beams or columns have been proposed for steel special moment-resisting frames (SMRFs) as low-damage connection concepts in seismic systems. While several are prequalified or under review for prequalification in the United States, the impact of column design requirements and fuse behavior on seismic performance has not yet been thoroughly investigated. This study analyzed typical steel SMRFs of varying heights (2, 4, 6, and 8 stories) using a prequalified yield-type fuse connection, specifically the Simpson Strong Tie™ (SST) Yield-Link (YL)® connection. Current prequalified design procedures for this connection allow columns to be designed for larger overstrength demands without meeting certain seismic compactness limits. This study investigates the impacts of column design variations (i.e., column overstrength, compactness, and capacity-limited forces) on collapse performance. Nonlinear static pushover and incremental dynamic analyses revealed that designs that considered seismic compactness, even with relaxed overstrength demands, outperformed those with higher overstrength but no compactness requirements, particularly in taller buildings. However, since the shallower column sections for shorter buildings were more likely to meet width-to-thickness limits for highly ductile members, relaxing overstrength requirements could reduce the collapse margin ratios in SST-YL SMRFs. These results indicate that there is potential to consider modified column design requirements for SST-YL connections, offering a cost-effective approach to improving structural resilience without compromising seismic collapse performance.

作为地震系统中低损伤的连接概念，在钢特殊抗弯矩框架（smrf）中提出了具有可更换组件的保险丝连接，其在梁或柱之前产生。虽然在美国有几个已经通过资格预审或正在进行资格预审，但柱设计要求和熔断器行为对抗震性能的影响尚未得到彻底调查。本研究分析了不同高度（2层、4层、6层和8层）的典型钢制smrf，使用了预认证的屈服型保险丝连接，特别是Simpson Strong Tie™（SST）屈服链接（YL）®连接。目前这种连接的预审设计程序允许柱在不满足某些抗震密实度限制的情况下设计更大的超强度要求。本研究调查了柱设计变化（即，柱超强度，密实度和容量限制力）对倒塌性能的影响。非线性静态推覆和增量动态分析表明，考虑抗震密实度的设计，即使有宽松的超强度要求，也优于那些有更高的超强度但没有密实度要求的设计，特别是在高层建筑中。然而，由于较短建筑物的较浅柱截面更有可能满足高延性构件的宽厚限制，因此放宽超强度要求可以降低SST-YL smrf的倒塌裕度比。这些结果表明，有可能考虑修改SST-YL连接的柱设计要求，提供一种在不影响抗震倒塌性能的情况下提高结构弹性的经济有效方法。

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引用次数: 0

Synergistic evolution mechanism of residual stress field and deformation in aero-engine thin-walled blades under service conditions 服役条件下航空发动机薄壁叶片残余应力场与变形的协同演化机制

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-21 DOI: 10.1016/j.tws.2026.114570

Yilong Cao , Changfeng Yao , Liang Tan , Daoxia Wu , Xu Zou , Shiqian Xiang , Wenran Zhou , Shuaifeng Xue

The surface state achieved through surface modification process is inherently unstable, and the evolution of surface integrity during service significantly impacts the performance of aero-engine blades. This study systematically investigated the surface integrity and deformation behavior of aero-engine blades by shot peening at different service stages. Experimental results indicated that the surface integrity of the blades underwent a sudden change within 10³ cycles, followed by a stable evolution phase, exhibiting notable spatiotemporal discreteness. Specifically, distinct evolutionary patterns were observed between the blade root and tip, the back and basin, and along the chord and height directions, leading to differential evolution in position and profile tolerances. Through vibration simulation, it was revealed that the discrete distribution of working stress was the primary cause of the spatiotemporal discreteness in surface integrity evolution. Based on linear elastic theory, the deformation behavior of the blades was shown to follow directional and relative criteria. Furthermore, a deformation prediction model for in-service blades (NS-FEM) was established, which introduces "net stress" as the driving load for deformation and avoids the damage to the blades caused by residual stress testing. The relative error of the NS-FEM model in predicting blade position was less than 15%. This study not only enhances the understanding of blade deformation behavior during service but also provides a methodological reference for the non-destructive prediction and online control of blade machining deformation.

通过表面改性工艺获得的表面状态具有固有的不稳定性，在服役过程中，表面完整性的演变对航空发动机叶片的性能有重要影响。本研究系统地研究了航空发动机喷丸强化叶片在不同服役阶段的表面完整性和变形行为。实验结果表明，叶片表面完整性在10³周期内经历一个突变，随后进入稳定演化阶段，具有明显的时空离散性。叶根与叶尖之间、叶背与叶盆之间、叶弦与叶高方向上的演化模式存在差异，导致叶片位置和剖面容差的演化存在差异。通过振动仿真，揭示了工作应力的离散分布是导致表面完整性演化时空离散的主要原因。基于线弹性理论，叶片的变形行为遵循方向准则和相对准则。建立了在役叶片的变形预测模型（NS-FEM），该模型引入“净应力”作为变形的驱动载荷，避免了残余应力测试对叶片的损伤。NS-FEM模型预测叶片位置的相对误差小于15%。该研究不仅提高了对服役过程中叶片变形行为的认识，而且为叶片加工变形的无损预测和在线控制提供了方法参考。

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引用次数: 0

Experimental evaluation on the shear performance of grouted bolt connections in steel-CLT and steel-CLBT composite structures 钢- clt和钢- clbt组合结构注浆螺栓连接抗剪性能试验评价

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-22 DOI: 10.1016/j.tws.2026.114573

Jinwei Lu , Yang Wei , Hao Du , Kang Zhao , Silu Huang , Jiawei Chen

Steel-cross laminated timber (CLT) composite floors have increasingly emerged as an alternative to steel-concrete composite floors due to their sustainability and construction efficiency. In addition, given the superior mechanical properties and resource utilization of cross-laminated bamboo and timber (CLBT), steel-CLBT composite systems hold promise for further enhancing the overall structural performance of steel-timber composite (STC) floors. The composite action of STC systems is governed by the shear performance of their connections. Traditional demountable bolt connections exhibit low stiffness in STC systems. Therefore, this study proposed grouted bolt connections for steel-CLT and steel-CLBT composite structures. Ten sets of push-out specimens were designed to investigate the effects of bolt diameter, bolt strength, grout diameter, and panel type. The test results indicate that steel-CLBT connections failed due to bolt shear, whereas those in the steel-CLT connections exhibited failure modes involving grout crushing, timber crushing, and bolt bending. The grouted bolted connections in the steel-CLBT composite system exhibit significantly higher shear capacity and slip stiffness than those in the steel-CLT composite system (shear capacity increased by 45–70% and slip stiffness increased by 1.8–10 times), albeit with lower ductility. In addition, compared with demountable bolted connections, the grouted bolted connections in the steel-CLBT composite system achieve more than a twofold increase in slip stiffness. Finally, based on the different failure modes, the shear capacity and load-slip behavior of various connections were evaluated and predicted.

由于其可持续性和施工效率，钢-交叉层压木材（CLT）复合地板越来越多地成为钢-混凝土复合地板的替代品。此外，考虑到竹木交叉层压（CLBT）优越的力学性能和资源利用率，钢-CLBT复合系统有望进一步提高钢-木复合地板（STC）的整体结构性能。STC体系的复合作用取决于其连接的抗剪性能。传统的可拆卸螺栓连接在STC系统中具有较低的刚度。因此，本研究提出了钢- clt和钢- clbt组合结构的注浆螺栓连接。设计了10组推拔试件，研究了锚杆直径、锚杆强度、注浆直径和面板类型对锚杆承载力的影响。试验结果表明，钢- clt连接的破坏主要是由于锚杆剪切，而钢- clt连接的破坏模式主要是注浆破碎、木材破碎和锚杆弯曲。与钢- clt组合体系相比，钢- clt组合体系中注浆螺栓连接的抗剪承载力和滑移刚度显著提高（抗剪承载力提高45 ~ 70%，滑移刚度提高1.8 ~ 10倍），但延性较低。此外，与可拆卸螺栓连接相比，在钢- clbt复合体系中，注浆螺栓连接的滑移刚度提高了两倍以上。最后，根据不同的破坏模式，对不同连接的抗剪能力和荷载-滑移行为进行了评估和预测。

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引用次数: 0

A boundary determination and XIGA-based multiple crack type identification method for the rotating pre-twisted FG blade model 基于xiga的旋转预扭FG叶片多裂纹类型识别方法

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-22 DOI: 10.1016/j.tws.2026.114576

Saifeng Zhong , Guoyong Jin , Qingtao Gong , Yukun Chen , Na Wang

The identification of crack parameters in blades is crucial for the operational safety of rotating machinery. This paper presents a boundary determination and XIGA-based multiple crack type identification method for the rotating functionally graded (FG) blades. Assuming that the material varies in the thickness direction, the first-order shear deformation shell theory is used to describe the displacement of the FG blade with a pre-twisted angle. The XIGA method utilizing a level set approach is applied to consider the crack effects, with distinct enrichment functions capturing the displacement fields at the crack tip and along the crack faces. Taking the modal parameters as input, DE algorithm minimizes the objective function through multiple iterations to achieve intelligent quantitative identification of boundary penalty stiffness and crack parameters. Convergence and accuracy verifications of the cracked blade model with various types of cracks are performed by using data from experiments and software simulations. The parameter analysis reveals that different combinations of crack length and location induce distinct variation in the natural frequencies of the blade model. It is evident from the comparative analysis that the optimization technique with XIGA model exhibits comparable precision in detecting the targeted crack information. The developed method demonstrates applicability across multiple crack types, allowing for the effective identification of a wide range of crack parameter combinations.

叶片裂纹参数的识别对旋转机械的运行安全至关重要。提出了一种基于xiga的旋转功能梯度叶片多裂纹类型识别方法。假设材料沿厚度方向变化，采用一阶剪切变形壳理论来描述FG叶片带预扭角的位移。利用水平集方法的XIGA方法考虑裂纹效应，利用不同的富集函数捕获裂纹尖端和沿裂纹面的位移场。DE算法以模态参数为输入，通过多次迭代最小化目标函数，实现边界罚刚度和裂纹参数的智能定量化识别。利用实验数据和软件仿真对不同裂纹类型的叶片裂纹模型进行了收敛性和精度验证。参数分析表明，裂纹长度和位置的不同组合会引起叶片模型固有频率的显著变化。对比分析表明，采用XIGA模型的优化技术在检测目标裂纹信息方面具有相当的精度。所开发的方法证明了对多种裂纹类型的适用性，允许有效识别大范围的裂纹参数组合。

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引用次数: 0

A novel separate similitude framework with distortion balance correction for dynamic scaling of stiffened plates under multidimensional geometric distortions 针对加筋板在多维几何变形下的动态伸缩问题，提出了一种具有变形平衡校正的独立相似框架

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-04-01 Epub Date: 2026-01-30 DOI: 10.1016/j.tws.2026.114598

Yingchun Du , Baoyan Duan , Guanheng Fan , Yiqun Zhang

Large-scale rectangular stiffened thin-plates are widely used in aerospace and engineering. While scaled experiments effectively predict full-scale structural responses, they face challenges due to the multi-scale characteristics of these plates. The combination of macroscopic plate dimensions and microscopic rib geometries results in multi-dimensional geometric distortions in the cross-sectional parameters during scaling. Due to distortion effects, the distorted design of cross-sectional and inertia moment significantly reduces the dynamic test effectiveness of scale models. To address these limitations, this study proposes an improved separate similitude method based on the governing equation approach. First, a step-by-step separation strategy is employed to develop complete similitude and partial similitude model groups, minimizing distortion effects. Second, a natural frequency prediction equation is derived using the governing equation approach. By incorporating the intrinsic relationship between cross-sectional dimensions and inertia moment, a distortion balance correction coefficient is introduced to further compensate for distortion-induced errors. Finally, a distorted similitude law is established to predict prototype natural frequency. The proposed method is validated through numerical simulations and experimental studies, successfully reproducing the prototype’s dynamic characteristics. The prediction results of existing methods are also provided for comparison. Results indicate that the errors of the proposed method are <2% in the numerical case and between 0.28% and 5.35% in the experimental case.

大型矩形加筋薄板广泛应用于航空航天和工程领域。虽然比例实验能有效地预测全尺寸结构响应，但由于这些板的多尺度特性，它们面临着挑战。宏观板尺寸与微观肋几何形状的结合导致了标度过程中截面参数的多维几何畸变。由于变形效应的影响，截面和惯性矩的变形设计大大降低了比例模型的动态试验效果。为了解决这些局限性，本研究提出了一种改进的基于控制方程方法的分离相似方法。首先，采用分步分离策略开发完全相似和部分相似模型组，最大限度地减少失真效应。其次，利用控制方程法推导了固有频率预测方程。通过引入截面尺寸与惯性矩之间的内在关系，引入畸变平衡校正系数，进一步补偿畸变引起的误差。最后，建立了一个畸变相似律来预测原型的固有频率。通过数值模拟和实验研究验证了该方法的有效性，成功再现了原型机的动态特性。并对现有方法的预测结果进行了比较。结果表明，该方法的数值误差为2%，实验误差为0.28% ~ 5.35%。

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引用次数: 0