【新文速递】2026年5月14日固体力学SCI期刊最新文章

今日更新：International Journal of Solids and Structures 4 篇，Thin-Walled Structures 11 篇

International Journal of Solids and Structures

Numerical investigation of crack propagation in IWP sheet-based TPMS architected materials

Mohammed EL-Amrani, Fatima-Ezzahra Fekak, Hassane Moustabchir, Eliass EL Alami

doi:10.1016/j.ijsolstr.2026.114074

基于IWP板材的TPMS结构材料裂纹扩展的数值研究

Triply Periodic Minimal Surfaces (TPMS) are promising architected materials whose fracture behavior remains poorly understood due to the complexity of the underlying failure mechanis ms. This study investigates crack propagation in IWP sheet-based TPMS structures under uniaxial tension using a purely brittle phase-field model implemented in Abaqus, with Ti-6Al-4V as the base material. Both unit cell and multi-cell configurations are examined over a range of relative densities. Following a rigorous mesh sensitivity a nalysis, phase-field simulations reveal that relative density exerts a direct and proportional influence on fracture surface area, damage evolution rate, and crack propagation speed in unit cells. Macroscopic stress–strain an alysis shows that higher relative density increases load-bearing capacity but leads to more abrupt post-peak softening once damage initiates. Energy partitioning an alysis identifies a consistent four-stage fracture sequence and demonstrates that the elastic-to-fracture energy crossover is governed exclusively by relative density, independently of cell count. In multi-cell structures, relative density controls crack initiation and damage progression, while increasing the number of cells promotes spatial damage redistribution and greater fracture energy dissipation, yielding a more progressive and damage-tolerant failure mode. This work establishes a quantitative framework linking IWP topology, relative density, and structural periodicity to crack propagation behavior under tensile loading.

三周期最小表面（TPMS）是一种很有前途的建筑材料，由于其潜在破坏机制的复杂性，人们对其断裂行为知之甚少。本研究以Ti-6Al-4V为基材，利用Abaqus实现的纯脆性相场模型，研究了IWP片基TPMS结构在单轴拉伸下的裂纹扩展。在相对密度范围内，对单孔和多孔结构进行了检查。经过严格的网格灵敏度分析，相场模拟表明，相对密度对单元胞内的断裂表面积、损伤演化速率和裂纹扩展速度具有直接和成比例的影响。宏观应力应变分析表明，相对密度越高，承载能力越强，但损伤开始后峰后软化越突然。能量分配分析确定了一个一致的四段压裂序列，并表明弹性到裂缝的能量转换完全由相对密度控制，与细胞数量无关。在多单元结构中，相对密度控制裂纹萌生和损伤进展，而增加单元数量促进空间损伤再分布和更大的断裂能量耗散，从而产生更渐进和损伤容忍度更高的破坏模式。这项工作建立了一个定量框架，将IWP拓扑结构、相对密度和结构周期性与拉伸载荷下的裂纹扩展行为联系起来。

Free vibration of intact and cracked line-hinged plates: A unified solution framework based on the finite integral transform method

Bowen Yu, Yiming Chen, Dongqi An, Rui Li

doi:10.1016/j.ijsolstr.2026.114085

完整和裂纹线铰板的自由振动：基于有限积分变换法的统一解框架

Line-hinged plates, a type of foldable structure designed to achieve precise low-resistance rotation, may develop pre-existing cracks near hinge regions when subjected to fatigue damage caused by mechanical wear and sustained loading, leading to significant alterations in their vibration behavior. This study develops a unified an alytical solution framework for free vibration of both intact and cracked line-hinged rectangular thin plates by effectively integrating the finite integral transform (FIT) method with a subdomain decomposition strategy. Specifically, an intact line-hinged plate is divided into two subdomains, while a cracked line-hinged plate is discretized into six subdomains. By implementing a double cosine FIT on the free vibration equations of each subdomain, we derive transformed expressions that relate the transverse deflection to the unknowns. By incorporating external boundary conditions (BCs), crack BCs, interfacial line-hinge conditions, and the interfacial continuity conditions between subdomains into the inverse transform, a homogeneous system of linear algebraic equations is formulated. The system is solved sequentially to determine the natural frequencies and mode shapes. The obtained an alytical solutions are rigorously validated against other methods, confirming the accuracy of the present solution framework. Additionally, the influence of key structural parameters on the fundamental frequency of cracked line-hinged plates is systematically examined, providing further theoretical support for the design of such structures.

线铰板是一种可折叠结构，旨在实现精确的低阻力旋转，当受到机械磨损和持续载荷引起的疲劳损伤时，可能在铰链区域附近产生预先存在的裂纹，导致其振动行为发生重大变化。本文通过将有限积分变换（FIT）方法与子域分解策略有效结合，建立了完整和裂纹线铰矩形薄板自由振动的统一解析解框架。将完整的线铰板划分为两个子域，将断裂的线铰板离散为六个子域。通过在每个子域的自由振动方程上实现双余弦FIT，我们得到了将横向挠度与未知数联系起来的变换表达式。通过将外部边界条件、裂纹边界条件、界面线铰条件和子域间界面连续性条件引入到逆变换中，建立了齐次线性代数方程组。对系统进行顺序求解，确定系统的固有频率和振型。得到的解析解与其他方法进行了严格的验证，证实了本解框架的准确性。此外，系统研究了关键结构参数对裂纹线铰板基频的影响，为此类结构的设计提供了进一步的理论支持。

Arbitrary quadrilateral mesh compatibility and shear locking suppression in fracture an alysis of shell with quasi-conforming finite element-Peridynamics coupling model

Zebin Xing, Yang Xia, Guozhe Shen, Guojun Zheng, Xue Zhang, Guang Zhao

doi:10.1016/j.ijsolstr.2026.114072

基于准协调有限元-周动力耦合模型的壳体断裂分析中的任意四边形网格协调与剪切锁止

The fracture an alysis with the integration of Peridynamics (PD) and finite element methods (FEM) is limited by the stringent element quality standards inherent to FEM. This research presents a quasi-conforming (QC) FEM-PD coupling framework, which benefits from QCFEM’s capacity to handle arbitrary irregular quadrilateral elements and its resistance to shear locking in thin shell a nalysis. A morphing coupling strategy facilitates the seamless integration between the QCFEM domain and the PD region. Through the adoption of geometric equation weakening and by addressing the condition where shear strain in shell elements approaches zero as the thickness-to-length ratio diminishes, the formulation of QCFEM-PD sustains the accuracy of crack propagation simulation results. This holds particularly when the model encompasses complex hole structures, generates irregular mesh configurations, or possesses an exceedingly large length-to-thickness ratio. The numerical examples exhibit excellent accord with reference solutions, thus affirming the framework’s robustness and mesh adaptability in the an alysis of thin-shell fractures. The results illustrate that the proposed method upholds both precision and efficacy in forecasting intricate crack trajectories in thin-shell structures, rendering it particularly apt for large-scale engineering challenges involving complex geometries.

周动力法和有限元法相结合的断裂分析受到有限元法固有的严格的单元质量标准的限制。基于QCFEM处理任意不规则四边形单元的能力和在薄壳分析中抗剪切锁定的特性，提出了一种准一致性FEM-PD耦合框架。一种变形耦合策略促进了QCFEM域与PD域之间的无缝集成。通过采用几何方程弱化，解决壳单元剪切应变随厚长比减小而趋近于零的情况，保证了裂纹扩展模拟结果的准确性。当模型包含复杂的孔结构，产生不规则的网格配置，或具有非常大的长厚比时，这一点尤其适用。数值算例与参考解吻合良好，验证了该框架在薄壳断裂分析中的鲁棒性和网格适应性。结果表明，所提出的方法在预测薄壳结构复杂裂纹轨迹方面既精确又有效，特别适用于涉及复杂几何形状的大规模工程挑战。

Accurate stress intensity factors determination for 2D inclined crack using a double-boundary submodel method

Sanshao Zhuang, Xiuhua Chen, Junfeng Zhang, Wenqing Zheng, Miaolin Feng

doi:10.1016/j.ijsolstr.2026.114065

用双边界子模型法精确确定二维倾斜裂纹应力强度因子

The stress intensity factor (SIF) can be determined using the submodel technique, where the submodel boundary displacements from the global model are decomposed using the circular harmonic (CH) basis functions. The total SIF is then obtained by superposing precomputed SIFs of these basis functions, weighted by the corresponding decomposition coefficients. However, the accuracy of the SIF depends on submodel size. This study proposes a double-boundary submodel method for accurate SIF calculation, even with a s mall submodel size. A ghost boundary, typically 10 times the crack size, is introduced around the actual submodel boundary. Displacement mapping between these boundaries is established via the least-squares method. Since the ghost boundary is significantly larger than the crack size, the influence of crack introduction on the ghost boundary is negligible, thereby ensuring highly accurate SIF results. Using this approach, the SIFs for the first eight orders of CH basis functions are precomputed. Numerical validations are conducted to validate the proposed method.

应力强度因子（SIF）可以使用子模型技术确定，其中子模型边界位移从全局模型分解使用圆调和（CH）基函数。然后，通过叠加这些基函数的预先计算的SIF，并按相应的分解系数加权，得到总SIF。然而，SIF的准确性取决于子模型的大小。本研究提出了一种双边界子模型方法，即使子模型尺寸很小，也能精确计算SIF。在实际子模型边界周围引入一个幽灵边界，通常是裂缝尺寸的10倍。通过最小二乘法建立边界之间的位移映射。由于虚边界明显大于裂纹尺寸，因此裂纹引入对虚边界的影响可以忽略不计，从而保证了高精度的SIF结果。使用这种方法，可以预先计算前八阶CH基函数的sif。最后进行了数值验证。

Thin-Walled Structures

Experimental and Numerical Study on Tensile Behavior of Blind-Bolted T-stub Connections at Ambient and Elevated Temperatures

Yufei Liu, Yan Fei Zhu, Huiyun Zhang, Yachao Wang, Yao Yao

doi:10.1016/j.tws.2026.115117

室温和高温条件下盲栓t型短段连接拉伸性能的实验与数值研究

The performance at elevated-temperature of the T-stub component in the tension zone of blind-bolted beam-to-column end-plate connections remains insufficiently understood. To address this issue, this study investigates the tensile performance of blind-bolted T-stub connections under ambient, steady-state, and transient-state fire conditions through experiments and finite element (FE) an alysis. 29 specimens were tested to investigate failure modes and load-transfer mechanis ms under different thermo-mechanical paths and to quantify the effects of key design parameters. The test results showed that, at ambient temperature, the failure modes of blind-bolted T-stub connections include flange yielding, bolt fracture, and distinctive sleeve fracture. While at elevated temperatures, sleeve fracture was not observed. Increasing flange thickness enhanced the ambient yield load by at least 81% but reduced deformation capacity. Under transient heating, the non-monotonic dependence of critical and ultimate temperature on flange thickness indicates the existence of an optimal thickness for fire performance. Increasing bolt spacing significantly enhanced connection deformation capacity under ambient and transient conditions, with peak displacement and ultimate displacement increasing by up to 75% and 87%, respectively. Higher bolt shank strength reduced the deformation capacity at ambient temperature but enhanced it under transient heating. Compared with standard bolted connections, blind-bolted connections exhibited superior deformation capacity and fire resistance. The fire resistance decreased monotonically as the load ratio increased. The steady-state tests provided more conservative predictions than the transient-state tests. The FE results showed that bolt slip made a noticeable contribution to the overall deformation under ambient and steady-state conditions, but its influence became much less significant under transient-state conditions.

对于盲栓梁柱端板连接受拉区t形构件在高温下的性能，目前还没有充分的认识。为了解决这一问题，本研究通过实验和有限元分析，研究了盲栓t型短节连接在环境、稳态和瞬态火灾条件下的拉伸性能。研究了29个试件在不同热-机械路径下的破坏模式和载荷传递机制，并量化了关键设计参数的影响。试验结果表明，在常温下，盲栓t型短段连接的破坏模式包括法兰屈服、螺栓断裂和特殊套管断裂。而在高温下，没有观察到滑套断裂。增加法兰厚度使环境屈服载荷提高了至少81%，但降低了变形能力。在瞬态加热条件下，临界温度和极限温度与法兰厚度的非单调关系表明存在防火性能最优厚度。增加锚杆间距可显著提高连接在环境和瞬态条件下的变形能力，峰值位移和极限位移分别增加75%和87%。较高的螺栓杆强度降低了常温下的变形能力，但提高了瞬态加热下的变形能力。与标准螺栓连接相比，盲栓连接具有更好的变形能力和耐火性能。耐火性能随载荷比的增大而单调降低。稳态测试提供了比瞬态测试更保守的预测。结果表明，锚杆滑移在环境和稳态条件下对锚杆整体变形有显著贡献，但在瞬态条件下对锚杆整体变形的影响较小。

Novel corrugated steel-sprayed UHPC composite (CSSUHPCC) arches: Structural testing, numerical simulation and calculation method

Zhanming Wu, Faqi Liu, Changyong Liu, Ou Zhao, Yuyin Wang

doi:10.1016/j.tws.2026.115116

新型波纹钢喷涂UHPC复合材料拱：结构试验、数值模拟及计算方法

In this paper, an innovative arch system–corrugated steel-sprayed UHPC composite (CSSUHPCC) arch is proposed, which is characterized by rapid construction and excellent load-carrying capacity, making it a particularly suitable replacement for conventional corrugated steel (CS) arch in bridge and culvert projects with high demands for construction efficiency and load-carrying capacity. Experimental and numerical investigations into CSSUHPCC arches are conducted and reported in the present paper. Tests on five full-scale CSSUHPCC arch specimens with 6 meters in length were first conducted. Experimental results revealed that the load-carrying capacity and initial stiffness of CSSUHPCC arches are 2.5 times and 1.3 times higher than those of the CS arches, respectively. In comparison with the modified epoxy resin-based technique, the shear connector-based interface connection technique offers a better interfacial connection between CS and UHPC in the CSSUHPCC arch and thus better material utilization of CS and UHPC. Furthermore, refined nonlinear finite element models were developed to simulate experimental structural responses and then used to conduct parametric an alyses for examining all influencing geometric and material parameters, including the thicknesses of CS and UHPC, the strengths of CS and UHPC, and the rise-span ratio and span length. Finally, a calculation method for predicting the load-carrying capacity of CSSUHPCC arches has been proposed.

本文提出了一种新型拱系——波纹钢喷涂UHPC复合拱（CSSUHPCC），该拱具有施工速度快、承载能力优异的特点，特别适合在对施工效率和承载能力要求较高的桥涵工程中替代传统波纹钢（CS）拱。本文对CSSUHPCC拱桥进行了实验和数值研究。首先对5个长度为6米的全尺寸CSSUHPCC拱试件进行了试验。试验结果表明，CSSUHPCC拱的承载能力和初始刚度分别是CS拱的2.5倍和1.3倍。与基于改性环氧树脂的界面连接技术相比，基于剪切连接件的界面连接技术在CSSUHPCC拱中提供了更好的CS与UHPC的界面连接，从而更好地利用CS和UHPC的材料。此外，建立了精细的非线性有限元模型来模拟实验结构响应，然后使用参数分析来检查所有影响几何和材料参数，包括CS和UHPC的厚度，CS和UHPC的强度，以及升跨比和跨长。最后，提出了一种预测CSSUHPCC拱承载力的计算方法。

Nonlinear Vibration An alysis and Experimental Research on Rotating Pre-twisted TC4 Blades under Combined Transverse Aerodynamic Loads and Tip Clearance Airflow

Y.F. Zhang, Y.C. Teng, H. Feng, W. Zhang

doi:10.1016/j.tws.2026.115115

TC4叶片在横向气动载荷和叶尖间隙气流联合作用下的非线性振动分析与实验研究

Titanium alloy Ti-6Al-4V (TC4) is widely used because of its excellent mechanical properties and light weight in aero-engine fields. This paper investigates the nonlinear vibrations of the rotating pre-twisted TC4 blades for the compressor. The rotating pre-twisted TC4 blade is simplified to a rotating pre-twisted cantilever plate. The nonlinear governing equations of motion are derived by using the classical plate theory, von Karman geometric nonlinearity, Lagrangian formalis m, and mode-shape functions. The steady-state rotational speed and periodic perturbations are considered in these equations. The coupled two-degree-of-freedom nonlinear ordinary differential governing equations are obtained to an alyze the system dynamics under combined the transverse and axial excitations. Combining the dynamic modeling, finite element an alysis and vibration tests, we comprehensively evaluate the nonlinear vibrations of rotating pre-twisted TC4 blade. The accuracy of the model is confirmed. Comprehensive nonlinear dynamic an alyses are conducted using Runge-Kutta integration. These reveal the critical features, including the amplitude-frequency response curves, waveform, Poincare maps, 2D and 3D bifurcation diagrams, maximum Lyapunov exponents and phase portraits. Significantly, the results reveal the evolution of complex nonlinear behaviors under combined transverse and axial excitations, including the hardening spring characteristic of amplitude-frequency response curves and the transitions between periodic and chaotic motions. This study establishes a systematic theoretical framework for understanding the nonlinear vibration mechanis ms of rotating pre-twisted TC4 blades, and provides valuable guidance for the design, optimization and vibration control of compressor blades.

钛合金Ti-6Al-4V （TC4）因其优异的力学性能和重量轻而广泛应用于航空发动机领域。本文对压气机TC4预扭叶片的非线性振动进行了研究。将旋转预扭TC4叶片简化为旋转预扭悬臂板。利用经典板理论、冯·卡门几何非线性、拉格朗日形式和模态振型函数推导了非线性运动控制方程。在这些方程中考虑了稳态转速和周期扰动。建立了耦合的二自由度非线性常微分控制方程，分析了横向和轴向联合激励下的系统动力学。结合动力学建模、有限元分析和振动试验，对TC4预扭叶片的非线性振动进行了综合评价。验证了模型的准确性。采用龙格-库塔积分法进行了综合非线性动力分析。这些揭示了关键特征，包括幅频响应曲线、波形、庞加莱图、2D和3D分岔图、最大李亚普诺夫指数和相位肖像。重要的是，研究结果揭示了在横向和轴向联合激励下复杂非线性行为的演变，包括幅频响应曲线的硬化弹簧特征以及周期运动和混沌运动之间的转变。本研究为理解TC4预扭叶片旋转非线性振动机理建立了系统的理论框架，为压气机叶片的设计、优化和振动控制提供了有价值的指导。

Geometrically nonlinear thermo-electro-mechanical an alysis of flexoelectric composite microscale plates with surrogate-assisted parametric evaluation

Guibin GONG, Chuancai CHEN, Mu FAN, Zhongmin XIAO

doi:10.1016/j.tws.2026.115114

柔电复合材料微尺度板几何非线性热-电-力分析及辅助参数评价

Localized electric field gradients generated by an atomic force microscopy (AFM) probe induce highly non-uniform flexoelectric stresses in layered composite microscale plates. When combined with thermal gradients through the thickness, the resulting deformation may enter a regime of moderate or large deflection in which geometrically nonlinear membrane forces emerge and alter the effective stiffness governing both static and dynamic response. However, the role of membrane forces generated by geometric nonlinearity under increasing loading in coupled thermo-electro-mechanical behavior has not been systematically quantified. This study develops a nonlinear formulation for a flexoelectric layered composite micro-plate subjected to localized electrostatic actuation and a linear temperature gradient. The flexoelectric and thermal effects are consistently integrated into a von Kármán plate framework by reducing them to resultant forces and moments, referenced to the mechanical neutral axis. The nonlinear equilibrium establishes a membrane stress field that varies with loading and enters the vibration an alysis through an equivalent force representation consistent with the vibration mode. The results demonstrate that membrane forces induced by geometric nonlinearity progressively govern the effective structural stiffness under increasing electro-thermal loading, and thus control both static and dynamic responses. The surrogate-assisted framework enables efficient exploration of the coupled design space and shows that optimal performance is achieved through a balance between flexoelectric localization and structural stiffness.

原子力显微镜（AFM）探针产生的局部电场梯度在层状复合材料微尺度板中引起高度不均匀的挠曲电应力。当通过厚度与热梯度相结合时，产生的变形可能会进入中等或大挠度的状态，在这种状态下，几何非线性膜力会出现，并改变控制静态和动态响应的有效刚度。然而，在载荷增加的情况下，几何非线性所产生的膜力在热-电-机械耦合行为中的作用尚未得到系统的量化。本文研究了受局部静电驱动和线性温度梯度作用的柔性电层状复合微板的非线性公式。柔性电和热效应始终集成到一个von Kármán板框架通过减少他们的合力和力矩，参考机械中性轴。非线性平衡建立了随载荷变化的膜应力场，并通过与振动模态一致的等效力表示进入振动分析。结果表明，在不断增加的电热载荷下，几何非线性引起的膜力逐渐控制结构的有效刚度，从而控制结构的静态和动态响应。代理辅助框架能够有效地探索耦合设计空间，并表明通过柔电定位和结构刚度之间的平衡来实现最佳性能。

An explicit phase field shell particle method for modeling dynamic fracture and fragmentation of thin shells

Jiannan Chao, Jiasheng Li, Zhixin Zeng, Xiong Zhang

doi:10.1016/j.tws.2026.115102

一种显式相场壳粒法模拟薄壳的动态断裂和破碎

This paper proposes an explicit phase field shell particle method (PFSPM) for simulating dynamic fracture and fragmentation in thin shell structures. The core innovation lies in seamlessly integrating phase field fracture theory into a locking-free shell particle formulation, thereby creating a method that is both accurate for shell kinematics and robust for complex crack evolution. A novel phase field-guided adaptive particle conversion algorithm is introduced to automatically transform critically damaged shell particles into standard MPM particles. This approach effectively eliminates mesh distortion issues while preserving mass and momentum conservation, enabling the robust simulation of complex fragmentation. The method is validated through dynamic crack branching, Kalthoff-Winkler experiments at different impact velocities, ductile tearing of pre-cracked plates, and fracture in cylindrical shells under various loading conditions, showing excellent agreement with experimental data and reference solutions. Furthermore, high-velocity steel sphere penetration simulations of aluminum plates demonstrate PFSPM’s capability in handling extreme deformation and fragmentation scenarios with complex multi-stage impact processes, confirming the method’s accuracy and potential for engineering applications involving severe shell fracture phenomena.

本文提出了一种显式相场壳粒法（PFSPM）来模拟薄壳结构的动态断裂和破碎。其核心创新在于将相场断裂理论无缝地整合到无锁壳粒子公式中，从而创造了一种既能准确计算壳运动学又能对复杂裂纹演化具有鲁棒性的方法。提出了一种相场引导的自适应粒子转换算法，将严重损伤的壳粒子自动转换为标准粒子。这种方法有效地消除了网格畸变问题，同时保持了质量和动量守恒，实现了复杂碎片的鲁棒模拟。通过动态裂纹分支、不同冲击速度下的Kalthoff-Winkler实验、预裂板的韧性撕裂、不同载荷条件下圆柱壳的断裂等实验验证了该方法的有效性，结果与实验数据和参考解吻合良好。此外，高速钢球对铝板的侵彻模拟表明，PFSPM能够处理复杂的多阶段冲击过程中的极端变形和破碎情况，证实了该方法的准确性和在涉及严重壳体断裂现象的工程应用中的潜力。

I-beam-to-SHS-column joints using passing-through plates subjected to anti-symmetric bending moments

Mouad Madhouni, Maël Couchaux, Mohammed Hjiaj, Alper Kanyilmaz

doi:10.1016/j.tws.2026.115103

工字钢- shs柱节点采用受反对称弯矩作用的贯通板

The design of rigid or semi-rigid I-beam to HSS column joints presents critical challenges. Joints using passing through plates may be a solution that has been recently studied for I-beam-to-CHS columns joints. The case of I-beam-to-SHS column joints using passing plates has been investigated only in presence of symmetric bending moments. The objective of the present paper is to extend the study of this type of joints by investigating their behaviour when subjected to anti-symmetric bending moments. Firstly, the results of 5 experimental tests are presented. The loading was introduced either monotonically or cyclically varying the tube-wall thickness and the welding technique. The results are then compared to a previous experimental campaign conducted on equivalent I-beam-to-CHS column joints using passing plates. The behaviour of I-beam-to-SHS joints is substantially improved comparatively to CHS ones. A finite element model was next developed with ANSYS APDL using solid and contact elements. The FE results show good agreement with the experimental findings. The force distribution is investigated numerically and experimentally through strain gauges among the different components, namely for the passing web/flange plates and the tube-wall in transverse tension/compression or shear. Based on these observations, a novel a nalytical model is proposed to predict the bending resistance of these joints.

刚性或半刚性工字梁与高速钢柱节点的设计提出了严峻的挑战。采用贯通板的节点可能是一种解决方案，最近已研究的工字梁- chs柱节点。仅在对称弯矩存在的情况下，对使用过板的工字梁- shs柱节点进行了研究。本文的目的是通过研究这种类型的节点在遭受反对称弯矩时的行为来扩展对它们的研究。首先，给出了5个试验的结果。通过对管壁厚度和焊接工艺的单调变化和循环变化来引入载荷。然后将结果与先前使用传递板对等效工字钢- chs柱节点进行的实验活动进行比较。工字梁- shs节点的性能较CHS节点有明显改善。利用ANSYS APDL建立了实体单元和接触单元的有限元模型。有限元计算结果与实验结果吻合较好。通过应变片对不同构件（即通过腹板/法兰板和管壁）在横向拉伸/压缩或剪切作用下的受力分布进行了数值和实验研究。基于这些观察结果，提出了一种新的分析模型来预测这些节点的抗弯能力。

Recent advances in energy field-assisted spinning for hard-to-deform materials: process, deformation characteristics, and simulation

Yawen Ouyang, Yixi Zhao, Xuan Cheng, Zhongqi Yu

doi:10.1016/j.tws.2026.115101

难变形材料的能量场辅助纺丝的最新进展：工艺、变形特性和模拟

Driven by the increasing demand for lightweight and extreme performance of the thin-walled structures, the application of hard-to-deform materials (HDMs) (such as high-strength aluminum alloys, titanium alloys, magnesium alloys, etc.) has become increasingly widespread. However, these materials face severe challenges during conventional spinning, including high deformation resistance, poor plasticity and difficult control of springback. Energy field-assisted spinning (EFAS), which significantly improves material flow behavior by introducing external energy, serves as a critical pathway for achieving high-performance forming of the thin-walled structures. This study comprehensively reviews the latest research advances in the energy field-assisted spinning for hard-to-deform materials. Firstly, the technical characteristics of spinning processes assisted by various energy fields are systematically summarized, including thermal fields (such as flame, electromagnetic induction, laser, and friction heating methods), ultrasonic field, and current field. Secondly, the paper focuses on an alyzing the effect of different energy fields on the deformation characteristics of HDMs, revealing the influences of energy fields on dynamic recrystallization, dislocation motion, and texture evolution. Furthermore, the current research status of the numerical simulation method in the three aspects of constitutive model, boundary conditions, and process optimization has also been discussed. Finally, addressing current bottlenecks such as the incomplete clarification of multi-energy field coupling mechanis ms and the insufficient level of intelligent process control, this paper outlines future development trends for the energy field-assisted spinning. Key focus directions include the construction of high-precision constitutive models, the development of high-efficiency computational strategies, and the advancement of process digitalization and equipment intelligence.

在薄壁结构轻量化和极致性能需求日益增长的驱动下，难变形材料（如高强度铝合金、钛合金、镁合金等）的应用日益广泛。然而，这些材料在常规纺丝过程中面临着变形抗力高、塑性差、回弹控制困难等严峻挑战。能量场辅助旋压（EFAS）是实现薄壁结构高性能成形的重要途径，它通过引入外部能量来显著改善材料的流动行为。本文综述了难变形材料能量场辅助纺丝的最新研究进展。首先系统总结了各种能量场辅助纺丝工艺的技术特点，包括热场（如火焰、电磁感应、激光、摩擦加热等）、超声场、电流场等。其次，重点分析了不同能量场对HDMs变形特性的影响，揭示了能量场对动态再结晶、位错运动和织构演化的影响。此外，还讨论了数值模拟方法在本构模型、边界条件和工艺优化三个方面的研究现状。最后，针对当前多能场耦合机理不明确、过程智能控制水平不足等瓶颈，提出了能量场辅助纺丝的未来发展趋势。重点关注的方向包括高精度本构模型的构建、高效计算策略的开发以及过程数字化和装备智能化的推进。

Programmable Multistable Mechanical Metamaterials with Multiple Dynamic Response Mechanis ms

Yuxi Wang, Sheng Shang, Haozhe Wang, Anfeng Yu, Junhai Li

doi:10.1016/j.tws.2026.115093

具有多动态响应机制的可编程多稳定机械超材料

Existing protective metamaterials typically rely on a single dynamic response mechanis m and lack the ability to adaptively switch between different protection modes under complex blast loading. To address this limitation, this study designs and systematically investigates a multistable spring-linkage mechanical metamaterial unit (MSLU). By adjusting the spring stiffness, the MSLU enables in-situ tunability of protective performance and active switching between two distinct protection modes, namely self-locking energy absorption and oscillatory dissipation. A theoretical model is established to predict the mechanical properties and steady-state transition characteristics of the structure, which is validated by quasi-static experiments and finite element simulations. Blast experiments demonstrate that under low-stiffness settings, the structure reduces the peak acceleration response from 1500g to 500g through rapid self-locking; under high-stiffness settings, it mitigates impact effects through reciprocating vibration and achieves a minimum trans missibility of −33dB at 20Hz. Finite element an alysis further confirms that the critical stiffness for mode switching is strongly correlated with the energy and impulse of the specific load. Additionally, the structure maintains stable performance after multiple impact cycles without obvious degradation. This study offers a new approach for the development of protective structures capable of adapting to complex dynamic load environments.

现有的保护材料通常依赖于单一的动态响应机制，缺乏在复杂爆炸载荷下自适应切换不同保护模式的能力。为了解决这一限制，本研究设计并系统地研究了一种多稳态弹簧连杆机械超材料单元（MSLU）。通过调整弹簧刚度，MSLU可以实现保护性能的原位可调，并在两种不同的保护模式（即自锁能量吸收和振荡耗散）之间主动切换。建立了预测结构力学性能和稳态过渡特性的理论模型，并通过准静态实验和有限元仿真验证了理论模型的正确性。爆炸实验表明，在低刚度设置下，结构通过快速自锁将峰值加速度响应从1500g降低到500g；在高刚度设置下，它通过往复振动减轻冲击影响，在20Hz时达到- 33dB的最小传输率。有限元分析进一步证实了模式切换的临界刚度与比载荷的能量和冲量密切相关。在多次冲击循环后，结构性能保持稳定，无明显退化。该研究为开发适应复杂动荷载环境的防护结构提供了一条新的途径。

An alysis of size effects and resonance characteristics of axially moving piezoelectric semiconductor microplates under multi-physical field coupling

Zhe Li, Jie Wang, Yuda Hu, Haobo Wang

doi:10.1016/j.tws.2026.115089

多物理场耦合下轴向移动压电半导体微板尺寸效应及共振特性分析

This study conducts theoretical an alysis on the size effect and resonance characteristics of axially moving piezoelectric semiconductor rectangular microplates in a multi-physical field environment. Based on the higher-order strain gradient theory and von Karman large deformation theory, the transverse vibration control equation under multi-physical field coupling is derived through the Hamilton principle, and the dimensionless vibration equation is discretized by the Galerkin method. This paper combines the incremental harmonic balance method with the pseudo-arclength method to plot the amplitude–frequency characteristic curves of the main resonance region of the system under high-frequency excitation. The cell mapping method is used to construct the attraction domain of the system, and the phase diagrams, time history curves and Poincaré mapping diagrams corresponding to each steady state are plotted. Through numerical simulation, the influence law of different strain theories on the vibration characteristics of the system is an alyzed. Finally, the superharmonic resonance region of the system is studied. The results show that in the main resonance region under high-frequency excitation, there exist complex multi-stable behaviors, and the responses exhibit asymmetry. There are significant differences in vibration responses under different strain theories. In the superharmonic resonance region, complex bifurcation behaviors are observed, as well as the collision phenomena between unstable solutions and chaotic attractors.

本研究对多物理场环境下轴向运动压电半导体矩形微板的尺寸效应和共振特性进行了理论分析。基于高阶应变梯度理论和von Karman大变形理论，通过Hamilton原理推导了多物理场耦合下的横向振动控制方程，并采用Galerkin方法将无量纲振动方程离散化。本文将增量谐波平衡法与伪弧长法相结合，绘制了高频激励下系统主共振区的幅频特性曲线。采用单元映射法构造了系统的吸引域，绘制了各稳态对应的相图、时程曲线和庞卡罗映射图。通过数值模拟，分析了不同应变理论对系统振动特性的影响规律。最后，对系统的超谐波谐振区域进行了研究。结果表明：在高频激励下，在主共振区存在复杂的多稳定行为，且响应表现出不对称性；不同应变理论下的振动响应有显著差异。在超谐波共振区，观察到复杂的分岔行为，以及不稳定解与混沌吸引子之间的碰撞现象。

A Comprehensive Methodology for Defining Service Temperatures in Composite Structures under Environmental Conditions with Self-Shadowing Considerations

Marco Abreu Filho, João Miguel Pereira, José Sena-Cruz, Miguel Azenha

doi:10.1016/j.tws.2026.115075

考虑自遮蔽因素的复合材料结构环境条件下使用温度的综合定义方法

Hybrid concrete/fibre-reinforced polymer (FRP) composite structural systems are increasingly used in civil engineering, yet current design provisions do not define procedures for determining the maximum and minimum service temperatures required to account for temperature-dependent material properties. This study presents a methodology for predicting service temperature ranges and thermal gradients through a synthetic thermal load that integrates geographical location, structural orientation, an alytical solar-radiation formulations and geometric self-shadowing. The method condenses environmental variability into representative exposure patterns within numerical modelling frameworks, enabling estimation of temperature limits for FRP and hybrid systems under service conditions. The methodology is developed and assessed based on calibrated numerical models of a hybrid sandwich panel system composed of glass fibre-reinforced polymer (GFRP) box profiles, a polyurethane foam core and a steel fibre-reinforced self-compacting concrete (SFRSCC) topping, complemented by a parametric investigation across different European locations. A pedestrian footbridge formed by GFRP I-profiles and an SFRSCC deck is an alysed as an application example to illustrate the use of the proposed approach in practice, highlighting the influence of solar-exposure asymmetry and the role of self-shadowing in predicting realistic thermal states. Results indicate that the synthetic thermal load provides a robust estimate of maximum temperatures and thermal gradients without leading to over-design, while minimum-temperature predictions depend more strongly on the adopted air-temperature limits. The findings support the ability of the methodology to capture thermal extremes and annual thermal evolution within the investigated framework, offering an efficient approach to define service temperature ranges in FRP composites, including hybrid concrete–FRP structures.

混合混凝土/纤维增强聚合物（FRP）复合结构系统在土木工程中的应用越来越多，但目前的设计规定并没有定义计算温度相关材料特性所需的最高和最低使用温度的程序。本研究提出了一种通过综合地理位置、结构方向、分析太阳辐射公式和几何自阴影的综合热负荷来预测使用温度范围和热梯度的方法。该方法在数值模拟框架内将环境可变性浓缩为具有代表性的暴露模式，从而能够估计FRP和混合系统在使用条件下的温度极限。该方法是基于由玻璃纤维增强聚合物（GFRP）箱体轮廓、聚氨酯泡沫芯和钢纤维增强自密实混凝土（SFRSCC）浇头组成的混合夹层板系统的校准数值模型开发和评估的，并辅以欧洲不同地区的参数调查。本文以一座由GFRP i型型材和SFRSCC桥面组成的人行天桥为例进行了分析，以说明所提出的方法在实践中的应用，强调了太阳照射不对称的影响和自遮蔽在预测实际热状态中的作用。结果表明，合成热负荷提供了最高温度和热梯度的可靠估计，而不会导致过度设计，而最低温度预测更强烈地依赖于所采用的空气温度限制。研究结果支持了该方法在研究框架内捕获极端温度和年度热演变的能力，提供了一种有效的方法来定义FRP复合材料（包括混凝土- FRP混合结构）的使用温度范围。

A Meta-Learning-Enhanced Physics-Informed Neural Network for Predicting the Deflection of CFRP Laminated Plates

Zi-han Lin, Gui-hua XIE, Hongyun Xia, Shuai Xu, Shuyang Wang

doi:10.1016/j.tws.2026.115042

基于元学习增强的物理信息神经网络预测CFRP叠合板挠度

Carbon fiber-reinforced polymer (CFRP) laminated plates exhibit pronounced anisotropy and stacking-sequence-dependent bending behavior, posing challenges for accurate and efficient prediction across varying ply orientations. Each layup configuration corresponds to a distinct bending system governed by different stiffness matrices, making conventional numerical or data-driven approaches computationally expensive when exploring the laminate design space. In this study, a Meta-Learning-enhanced physics-informed neural network (Meta-PINN) framework is proposed to predict the deflection behavior of CFRP laminated plates under transverse loading. By embedding the governing plate equations into the learning process and introducing Meta-Learning across multiple ply-angle configurations, the proposed approach learns shared mechanical representations among a family of laminated systems rather than treating each stacking sequence independently. As a result, the model can rapidly adapt to previously unseen layup configurations using only a few additional optimization steps. Numerical results demonstrate that the Meta-PINN accurately predicts deflection responses over a wide range of ply orientations and stacking sequences. Comparisons with finite element solutions and an alytical benchmarks confirm high accuracy in both global deflection distributions and characteristic response trends. Compared with conventional physics-informed and purely data-driven models, the proposed framework achieves improved computational efficiency while maintaining robust predictive performance under layup variations and perturbed loading conditions.

碳纤维增强聚合物（CFRP）层合板具有明显的各向异性和堆叠顺序相关的弯曲行为，这对不同厚度方向的准确和有效预测提出了挑战。每个层合结构对应于由不同刚度矩阵控制的不同弯曲系统，这使得传统的数值或数据驱动方法在探索层合设计空间时计算成本高昂。在这项研究中，提出了一个元学习增强的物理信息神经网络（Meta-PINN）框架来预测CFRP叠合板在横向荷载下的挠度行为。通过将控制板方程嵌入到学习过程中，并在多个角度配置中引入元学习，所提出的方法可以在一系列层压系统中学习共享的机械表示，而不是独立处理每个堆叠序列。因此，该模型只需使用几个额外的优化步骤，即可快速适应以前未见过的分层配置。数值结果表明，Meta-PINN能准确预测大范围铺装方向和铺装顺序下的挠度响应。与有限元解和分析基准的比较证实了全球挠度分布和特征响应趋势的高精度。与传统的物理信息模型和纯数据驱动模型相比，该框架提高了计算效率，同时在铺层变化和扰动加载条件下保持了稳健的预测性能。