【新文速递】2024年4月28日固体力学SCI期刊最新文章

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今日更新：International Journal of Solids and Structures 1 篇，Thin-Walled Structures 4 篇

International Journal of Solids and Structures

In-situ measurements of contact evolution for fractal rough surfaces under normal compression

Shaoqi Huang, Deheng Wei, Wenwen Han, Hengxu Song, Siyang Song, Yixiang Gan, Chongpu Zhai, Minglong Xu

doi:10.1016/j.ijsolstr.2024.112841

法向压缩下分形粗糙表面接触演化的原位测量

The contact interface plays a key role in the overall functionality and stability of structures. Understanding the evolution of the contact interface over time and its dependency on materials and load is crucial for functional integrity and operational safety assessment. In this study, we employ in-situ three-dimensional X-ray computed tomography (3DXRCT) to examine the creep behavior of 3D-printed surfaces exhibiting various roughness under constant normal compression. We observe that the overall contact area enlargement during the contact creep decreases with roughness amplitude and fractal dimension. The variation of interfacial separation distance is found to increase with roughness amplitude and decrease with fractal dimension. Correlation analysis reveals that the microcontact size played a more important role than the asperity shape in determining the microcontact enlargement. By examining the calculated interfacial strains extracted from XRCT measurements, significant deformations are found to occur at the non-contacting zones, indicating strong asperity interactions. This study offers high-resolution experimental measurements and unravels the asperity micromechanics for contact creep on rough surfaces, providing insights into understanding and optimizing the performance of rough interfaces.

接触界面对结构的整体功能和稳定性起着关键作用。了解接触界面随时间的演变及其对材料和载荷的依赖对于功能完整性和操作安全性评估至关重要。在这项研究中，我们使用原位三维x射线计算机断层扫描(3DXRCT)来检查在恒定的法向压缩下具有不同粗糙度的3d打印表面的蠕变行为。在接触蠕变过程中，整体接触面积随粗糙度和分形维数的增加而减小。界面分离距离随粗糙度的增大而增大，随分形维数的减小而减小。相关分析表明，微接触尺寸对微接触增大的影响比凹凸不平形状更大。通过检查从XRCT测量中提取的计算界面应变，发现在非接触区域发生了显着变形，表明强烈的粗糙相互作用。本研究提供了高分辨率的实验测量，揭示了粗糙表面接触蠕变的粗糙微观力学，为理解和优化粗糙界面的性能提供了见解。

Thin-Walled Structures

Fire test and simulation of circular steel tube confined steel-reinforced concrete columns

Fengqin Wang, Faqi Liu, Kang Hai Tan, Hua Yang, Kang Peng

doi:10.1016/j.tws.2024.111942

圆钢管约束钢筋混凝土柱的火灾试验与模拟

Steel tube confined steel-reinforced concrete (STCSRC) columns are novel steel-concrete composite columns where the steel tubes are disconnected at beam-column connections. Few researches have been conducted on the fire behaviour of STCSRC columns by now, though there are some relevant studies on the fire performance of steel-reinforced concrete-filled steel tubular (SR-CFST) columns. However, the mechanical behaviour of STCSRC columns under fire exposure differs from that of SR-CFST columns due to the discontinuous external steel tube. It is essential to carry out a study on the fire performance of STCSRC columns. The fire tests of four axially loaded STCSRC columns were carried out in this paper, and the failure mode, distribution of cross-sectional temperature, fire resistance, and lateral deflection were discussed. A finite element model was developed and validated with test results, and then a parametric analysis of the STCSRC stub and slender columns under fire exposure was performed. The load ratio, steel tube strength, the area ratio of steel tube to concrete, and slenderness ratio have an adverse effect on the fire resistance of STCSRC columns, whereas cross-sectional dimension, area ratio of steel section to concrete, and strength of steel section have a favourable impact. Concrete strength has a different influence on the fire resistance of STCSRC stub and slender columns. Finally, based on the specifications JGJ/T 471-2019 and EN 1994-1-2, simplified calculation methods for assessing the fire resistance of STCSRC columns were proposed.

钢管约束钢-钢筋混凝土柱是一种新型的钢-混凝土组合柱，在梁柱连接处将钢管断开。尽管对钢管混凝土(SR-CFST)柱的防火性能进行了相关研究，但目前对钢管混凝土柱的防火性能研究较少。然而，由于外部钢管的不连续，STCSRC柱在火灾暴露下的力学行为与SR-CFST柱不同。对STCSRC柱的防火性能进行研究是十分必要的。本文对4根轴向加载STCSRC柱进行了火灾试验，讨论了柱的破坏模式、截面温度分布、耐火性能和侧向挠度。建立了有限元模型，并与试验结果进行了验证，对STCSRC短柱和细长柱在火灾下进行了参数化分析。荷载比、钢管强度、钢管与混凝土面积比和长细比对STCSRC柱的耐火性能有不利影响，而截面尺寸、钢截面与混凝土面积比和钢截面强度有有利影响。混凝土强度对STCSRC短柱和细长柱的耐火性能有不同的影响。最后，根据JGJ/T 471-2019和EN 1994-1-2规范，提出了STCSRC柱耐火评定的简化计算方法。

B-Spline Subdomain Method for static calculations of Double-Curved Arch structures

Zhang Youhua, Yuan Bo, Shi Minjie, XU Zijie, Zheng Shiyu

doi:10.1016/j.tws.2024.111931

双曲拱结构静力计算的b样条子域法

A static computational study of a new type of Doubly-Curved Arch (DCA) structure using the Spline Subdomain Method (SSM) has been conducted and a new subdomain and generalized model for the static analysis of compression DCA structures have been developed. The equations for the numerical calculations by SSM are derived. The model is based on the SSM for the subdomain division of DCA. For the discretization of the flat shell subdomain, two sets of uniformly distributed spline nodes are used along the neighboring edges of the rectangular projection of the shallow shell subdomain. The linear combination of the product of these two specially designed cubic B-spline interpolation functions is the displacement field. This model generates its overall structural stiffness matrix and load vector of the DCA by direct assembly following the discretization of the spline in the shallow shell subdomain. This method is characterized by high modeling efficiency, low computational cost, and a wide range of applications for the analysis of irregular shell structures. Abaqus software is used to verify the performance of the suggested method through numerical examples. The findings demonstrate that non-regular DCA structures subjected to static compression can have their mechanical properties analyzed using the suggested method.

采用样条子域法对一种新型双曲拱结构进行了静力计算研究，建立了一种新的双曲拱压缩结构静力分析的子域和广义模型。推导了用SSM进行数值计算的方程。该模型是基于SSM的DCA子域划分模型。对于平壳子域的离散化，在浅壳子域矩形投影的相邻边缘上使用了两组均匀分布的样条节点。这两个特别设计的三次b样条插值函数的乘积的线性组合就是位移场。该模型在浅壳子域对样条曲线进行离散化后，通过直接装配的方式生成DCA的整体结构刚度矩阵和载荷向量。该方法具有建模效率高、计算成本低的特点，在不规则壳结构分析中具有广泛的应用前景。利用Abaqus软件，通过数值算例验证了所提方法的有效性。研究结果表明，非规则DCA结构在静压缩作用下的力学性能可以用该方法进行分析。

A FINITE STRAIN THEORY FOR INCOMPRESSIBLE RUBBER-LIKE CIRCULAR ARCHES WITH AN APPLICATION

R. Faruk Yükseler

doi:10.1016/j.tws.2024.111939

不可压缩类橡胶圆拱的有限应变理论及其应用

A theory for incompressible rubber-like circular arches, undergoing finite strains and rotations, with an application to the stability of Mooney-Rivlin, doubly fixed, thin beams having initially small circular imperfections under uniformly distributed radial loads, is presented. The essence of considering transverse normal strain is emphasized for an incompressible rubber-like material. The effects of the thickness, initial curvature, and perturbation terms of the pseudo strain components on the buckling loads and central deflections are investigated. The thresholds of buckling are observed to depend on the values of the curvature of the initially imperfect beam for the chosen nonlinear material.

提出了一种不可压缩的橡胶类圆拱理论，在有限应变和旋转作用下，应用于均匀分布径向载荷下具有初始小圆缺陷的Mooney-Rivlin双固定薄梁的稳定性。强调了不可压缩类橡胶材料考虑横向法向应变的本质。研究了拟应变分量的厚度、初始曲率和扰动项对屈曲载荷和中心挠度的影响。观察到屈曲的阈值取决于所选非线性材料的初始不完美梁的曲率值。

Modeling and vibro-acoustic behavior analysis of a plate-cavity coupling system equipped with a nonlinear energy sink

Yilin Chen, Jingtao Du, Yuhao Zhao, Yang Liu

doi:10.1016/j.tws.2024.111940

含非线性能量汇的板腔耦合系统建模及振声特性分析

This study establishes a three-dimensional model of a local NES-plate-acoustic cavity coupling system and investigates the nonlinear vibro-acoustic response of the NES-equipped plate coupled with the acoustic cavity and the control effect of the NES on the plate-cavity coupling system. Using the energy method to construct the governing equation of the coupled system, the vibro-acoustic behavior of the system is solved by the harmonic average approach and numerical integration method. The correctness of the results is proved through the comparison with the reference and mutual verification between different methods. On this basis, the control effect of NES on the vibration response and sound pressure response of the plate-cavity coupling system is investigated. It is found that NES exhibits a good control effect on the higher plate-controlled (PC) modal response peak, while showing a limited control effect on the lower PC modal response peak and the cavity-controlled (CC) modal peak. Due to the installation of the NES, various complex dynamic behaviors are generated in the unstable response area of the plate and cavity. At this time, the vibration state of sound pressure in the cavity is consistent with the vibration state of the plate, but the frequency distribution is different. The targeted energy transfer (TET) phenomenon between the NES and plate occurs at some frequencies. Furthermore, the nonlinear stiffness and concentrated mass of NES have a great influence on the response of the coupled system, and the damping effect of NES plays a major role in higher-order resonance response. When the damping and nonlinear stiffness are constant, an optimal value for the mass of NES exists to minimize the peak response. Finally, the comparison of vibro-acoustic characteristics of the plate-cavity coupling system equipped with the NES and TMD are investigated.

本文建立了局域NES-板-声腔耦合系统的三维模型，研究了安装NES的板与声腔耦合的非线性振声响应，以及NES对板-腔耦合系统的控制效果。利用能量法建立耦合系统的控制方程，采用谐波平均法和数值积分法求解系统的振声特性。通过与参考文献的比较和不同方法之间的相互验证，证明了结果的正确性。在此基础上，研究了NES对板腔耦合系统振动响应和声压响应的控制效果。研究发现，NES对较高的板控(PC)模态响应峰具有良好的控制效果，而对较低的板控(PC)模态响应峰和腔控(CC)模态响应峰的控制效果有限。由于NES的安装，在板腔的不稳定响应区产生了各种复杂的动力行为。此时腔内声压的振动状态与板的振动状态一致，但频率分布不同。靶能量传递(TET)现象在某些频率下发生。此外，网元的非线性刚度和集中质量对耦合系统的响应有很大影响，网元的阻尼效应在高阶共振响应中起主要作用。当阻尼和非线性刚度一定时，存在一个能使峰值响应最小的最优质量值。最后，比较了安装了NES和TMD的板腔耦合系统的振声特性。

来源：复合材料力学仿真Composites FEM

【新文速递】2024年4月12日复合材料SCI期刊最新文章

今日更新：Composite Structures 2 篇，Composites Part B: Engineering 1 篇，Composites Science and Technology 2 篇Composite StructuresFailure mechanism analysis and tensile constitutive model of basalt fiber concrete-rock interface based on fiber surface modificationJianxing Chen, Zheming Zhu, Lei Zhou, Leijun Ma, Haohan Wang, Meng Wangdoi:10.1016/j.compstruct.2024.118110基于纤维表面改性的玄武岩纤维混凝土-岩石界面破坏机理分析及拉伸本构模型This study investigates the tensile failure mechanism at the concrete-rock interface and proposes a concrete-rock interface tensile mechanical constitutive model considering the degree of rock surface indentation and surface morphology. The Brazilian disc splitting test results demonstrate that the depth and width of rock surface indentations collectively characterize the indentation angle θ, thereby influencing the tensile strength of the interface. Specifically, when 0° ≤ θ < 45°, the concrete-rock interface exhibits a tension-shear stress state, where cracks propagate along the interface leading to the debonding of the rock and concrete. When 45° ≤ θ ≤ 90°, the concrete-rock interface adopts a compression-shear state, with cracks gradually transitioning from the interface to the concrete interior. The latter scenario enables the higher tensile performance of the concrete-rock interface compared to interface fracture. Excessive indentation depth compromises the tensile strength of the interface by inducing bending moments. A mechanical model for the tensile behaviour of the concrete-rock interface is proposed, which effectively predicts the tensile strength of the interface and its evolutionary process.研究了混凝土-岩石界面的拉伸破坏机制，提出了考虑岩石表面压痕程度和表面形貌的混凝土-岩石界面拉伸力学本构模型。巴西盘劈裂试验结果表明，岩石表面压痕的深度和宽度共同表征压痕角θ，从而影响界面的抗拉强度。其中，当0° ≤ θ < 45°时，混凝土-岩石界面呈现拉剪应力状态，裂缝沿界面扩展，导致岩石与混凝土脱粘。当45° ≤ θ ≤ 90°时，混凝土-岩石界面处于压剪状态，裂缝逐渐从界面向混凝土内部过渡。后一种情况下，与界面断裂相比，混凝土-岩石界面具有更高的抗拉性能。过大的压痕深度会引起弯矩，从而影响界面的抗拉强度。提出了混凝土-岩石界面抗拉特性的力学模型，该模型能有效地预测界面抗拉强度及其演化过程。The Q4γs plate finite element for three-layer FGM sandwich plates in deflection, stresses, vibration, and thermal buckling analysisIrwan Katili, Jean-Louis Batoz, Susilo Widyatmoko, Hakim Naceurdoi:10.1016/j.compstruct.2024.118098用于三层 FGM 夹层板挠度、应力、振动和热屈曲分析的 Q4γs 板有限元This work adapts the Q4γs quadrilateral element to analyse three-layer FGM sandwich plates. Two types of FGM sandwich configurations are employed to assess the element performance in conducting static, free vibration, and thermal buckling analysis. The first configuration is a homogeneous core and FGM outer layers, while the second involves homogeneous top and bottom layers and an FGM core. Various problems have been run, and the results are compared with references to assess the accuracy of the element. Numerical results on the deflection, stresses, frequencies, and thermal buckling of symmetrical and non-symmetrical FGM sandwich plates are examined to evaluate the effectiveness of the current model. Furthermore, the influence of the power-law index and the length-to-thickness ratio on the analyses is also investigated.本研究采用 Q4γs 四边形单元分析三层 FGM 夹层板。在进行静态、自由振动和热屈曲分析时，采用了两种类型的 FGM 夹层结构来评估单元性能。第一种配置是均质核心和 FGM 外层，第二种配置是均质顶层和底层以及 FGM 核心。已运行了各种问题，并将结果与参考文献进行了比较，以评估该单元的准确性。研究了对称和非对称 FGM 夹层板的挠度、应力、频率和热屈曲的数值结果，以评估当前模型的有效性。此外，还研究了幂律指数和长厚比对分析的影响。Composites Part B: EngineeringReview of Porous Vegetation Eco-concrete (PVEC) Technology: From Engineering Requirements to Material DesignChaowei Zheng, Zuhua Zhang, Ziye Huang, Dongyu Wang, Wenjing Zhang, Zhengning Zhou, Yingcan Zhu, Dongmin Wang, Hao Wang, Zhengwu Jiangdoi:10.1016/j.compositesb.2024.111442多孔植被生态混凝土(PVEC)技术综述:从工程要求到材料设计Porous vegetation eco-concretes (PVEC) meet the initial growth needs of plants due to the fillers in pores containing soil and nutrients. The much higher permeability and biocompatibility than traditional compact concrete endow them as ecological material with wide applicability, and of course the performance requirements differ in different application scenarios. This review paper starts from the perspective of application requirements and delves into the relationship between material design and performance of PVEC, such as porosity, mechanical strength, alkalinity, durability, and plant growth performance. It gives a comprehensive understanding and the state-of-the-art research progress of PVEC, providing the guidance for future raw materials selection, structural design and application.多孔植被生态混凝土(PVEC)通过在孔隙中填充含有土壤和养分的填充物来满足植物的初始生长需要。与传统密实混凝土相比，密实混凝土具有更高的渗透性和生物相容性，作为生态材料具有广泛的适用性，当然在不同的应用场景下，其性能要求也有所不同。本文从应用需求的角度出发，深入探讨了PVEC材料设计与孔隙度、机械强度、碱度、耐久性、植物生长性能等性能之间的关系。全面了解PVEC的最新研究进展，为今后的原材料选择、结构设计和应用提供指导。Composites Science and TechnologySynergistically improving the edge-on impact damage resistance of composite laminates using multi-scale CNF/Z-pin tougheningGuozhi Zhao, Mengjia Li, Ziang Zhang, Jiajia Zheng, Ye Zhang, Yuan Zhao, Zhonglue Hu, Puhui Chendoi:10.1016/j.compscitech.2024.110586 采用多尺度CNF/Z-pin增韧协同提高复合材料层合板的抗边缘冲击损伤能力Edge-on impact damage of composite structures has drawn significant attention from the engineering and academic communities because of the much more notorious damage caused than that by out-of-plane impacts. However, research focusing on improving the edge-on impact resistance of these structures has been limited. This paper proposed a synergistic toughening approach involving multi-scale carbon nanofiber (CNF) and Z-pin to improve the composite laminates' edge-on impact damage resistance. Through analysis of mechanical response, C-scan, optical and Scanning electron microscopy (SEM) photographs of unreinforced, CNF-reinforced, Z-pin-reinforced and CNF/Z-pin-reinforced laminates, the failure mechanisms of the four types of laminates and the synergistic toughening mechanism of CNF/Z-pin were revealed. The results show that the synergistic toughening of CNF/Z-pin could weaken the negative effects caused by Z-pin implantation and that CNF has the potential to increase the damage initiation energy threshold of the laminate. Furthermore, the toughening effect of Z-pin was significantly greater than that of CNF in damage propagation. Specifically, at 50 J impact energy, the damage area of CNF/Z-pin, Z-pin and CNF-reinforced laminates was reduced by 50.5 %, 39.8 %, and 8.3 %, respectively, compared to unreinforced laminates.复合材料结构的侧向冲击损伤因其比面外冲击损伤更为严重而受到工程界和学术界的广泛关注。然而，关于提高这些结构的抗冲击能力的研究还很有限。为了提高复合材料层合板的抗冲击损伤性能，提出了一种采用多尺度纳米碳纤维和z销协同增韧的方法。通过对未增强、CNF增强、Z-pin增强和CNF/Z-pin增强层合板的力学响应、c扫描、光学和扫描电镜(SEM)分析，揭示了四种层合板的破坏机理和CNF/Z-pin的协同增韧机理。结果表明，CNF/Z-pin的协同增韧可以减弱Z-pin注入带来的负面影响，CNF有可能提高层合板的损伤起爆能阈值。在损伤扩展过程中，Z-pin的增韧效果明显大于CNF。具体来说，在50 J的冲击能量下，CNF/Z-pin、Z-pin和CNF增强复合材料的损伤面积分别比未增强复合材料减少了50.5 %、39.8 %和8.3 %。UiO-66 uniformly assembled foldable polyimide films with high transmittance and excellent ultraviolet resistanceHong Chen, Wei Ou, Yu Huang, Hongchang Huang, Junlan Li, Juncheng Liudoi:10.1016/j.compscitech.2024.110590 UiO-66均匀组装可折叠聚酰亚胺薄膜，具有高透光率和优异的抗紫外线性能As a protective layer for the flexible solar cell, a flexible protective material should be of high transmittance, excellent ultraviolet (UV) resistance and mechanical property. Herein, a foldable transparent polyimide (PI) composite film assembled with the zirconium-based metal-organic frameworks (UiO-66-X, X=H, NH2, NO2) is presented, prepared by the direct dispersion or in-situ growth methods. The results show that the transmittances of UiO-66-X@PI films (U@PI, NU@PI and OU@PI) prepared with the in-situ growth are higher than those of UiO-66-X/PI films prepared with the direct dispersion, and the former’s mechanical properties are also better than those of the latter. This may be because that the UiO-66-X in the former are embedded into the PI matrix to construct multipoint bonding network. The U@PI exhibits stronger UV-resistance than the Pristine PI, NU@PI and OU@PI after 5000 equivalent sun hours (ESHs) UV irradiation. The attenuations of average transmittance and tensile strength for U@PI are 2.19% and 18.68%, respectively, which are only one half and one-third of those for the Pristine PI (4.59% and 56.58%), respectively. And the average transmittance of U@PI has been over that of the Pristine PI after 5000 ESHs UV irradiation. This may be because that the porous UiO-66 increases the UV transmission path and the electron-hole recombination center, thereby inhibits the destructive effect of UV.作为柔性太阳能电池的保护层，柔性保护材料应具有高透光率、优异的抗紫外线性能和力学性能。本文采用直接分散法和原位生长法制备了一种由锆基金属-有机骨架(UiO-66-X, X=H, NH2, NO2)组装而成的可折叠透明聚酰亚胺(PI)复合薄膜。结果表明:原位生长法制备的UiO-66-X@PI薄膜(U@PI、NU@PI和OU@PI)的透光率均高于直接分散法制备的UiO-66-X/PI薄膜，前者的力学性能也优于后者。这可能是因为前者中的UiO-66-X被嵌入到PI矩阵中来构建多点键合网络。在5000等效太阳小时(ESHs)的紫外线照射下，U@PI比纯净PI、NU@PI和OU@PI具有更强的抗紫外线能力。U@PI的平均透过率和抗拉强度衰减分别为2.19%和18.68%，仅为原始PI(4.59%和56.58%)的1 / 2和1 / 3。经过5000 ESHs紫外线照射后，U@PI的平均透过率已经超过了原始PI。这可能是因为多孔的UiO-66增加了UV的透射路径和电子-空穴复合中心，从而抑制了UV的破坏作用。来源：复合材料力学仿真Composites FEM