【新文速递】2024年12月16日固体力学SCI期刊最新文章

今日更新：Composite Structures 7 篇，Composites Part A: Applied Science and Manufacturing 2 篇，Composites Part B: Engineering 2 篇，Composites Science and Technology 1 篇Composite StructuresEffect of thermal and electric coupling on the multifield response of laminated shell structures employing higher -order theoriesFrancesco Tornabene, Matteo Viscoti, Rossana Dimitridoi:10.1016/j.compstruct.2024.118801热电耦合对层合壳结构多场响应的影响The paper introduces a refined formulation, based on higher-order theories, for the thermo-electro-elastic analysis of laminated shell structures made of smart materials. The formulation employs a generalized higher-order model to describe the configuration variables, following the Equivalent Single Layer and Equivalent-Layer-Wise approaches. After presenting an effective homogenization procedure for thermo-electro-elastic smart composites, the fundamental equations are derived in curvilinear principal coordinates, taking into account the coupling effects among mechanical elasticity, electricity, and heat conduction. A semi-analytical solution is then obtained using Navier’s method. Furthermore, the three-dimensional response of the panel is determined through a recovery procedure that applies the Generalized Differential Quadrature (GDQ) numerical method. Numerical examples are provided, where the formulation is applied to both straight and curved panels subjected to various surface actions. These examples point out the coupling effect between different physical phenomena on the multifield three-dimensional response. Furthermore, the numerical results based on the proposed formulation are verified to be consistent with predictions from finite-element-based models, despite the reduced computational cost. The manuscript enables in a simple way the study of physical couplings between different fields that are not considered in most commercial software. As a result, this formulation offers a valuable tool for designing doubly-curved laminated panels made of innovative smart materials for novel engineering applications本文介绍了一种基于高阶理论的精细公式，用于智能材料层合壳结构的热电弹性分析。该公式采用广义的高阶模型来描述配置变量，遵循等效单层和等效分层方法。在给出热-电弹性智能复合材料的有效均匀化过程后，在考虑机械弹性、电学和热传导耦合效应的曲线主坐标下推导了基本方程。然后用纳维耶方法得到了半解析解。此外，通过应用广义微分正交（GDQ）数值方法的恢复程序确定面板的三维响应。 给出了数值例子，其中该公式适用于受各种表面作用的直线和弯曲面板。这些例子指出了不同物理现象之间的耦合效应对多场三维响应的影响。此外，尽管降低了计算成本，但基于该公式的数值结果与基于有限元模型的预测结果一致。 该手稿能够以一种简单的方式研究在大多数商业软件中没有考虑到的不同领域之间的物理耦合。因此，该配方为设计用于新型工程应用的创新智能材料制成的双弯曲层压板提供了有价值的工具Defect formation mechanism in the shear section of GH4099 superalloy honeycomb under milling with ice fixation clampingShaowei Jiang, Daomian Sun, Haibo Liu, Yueshuai Zuo, Yang Wang, Jianming Li, Kuo Liu, Yongqing Wangdoi:10.1016/j.compstruct.2024.118812冰固夹铣削下GH4099高温合金蜂窝剪切断面缺陷形成机理Superalloy honeycomb cores excel in corrosion, high temperature, and impact resistance. They are used in key aircraft structures under extreme conditions. To reduce the application difficulty of honeycomb core materials, cutting the samples is essential. Fracture zones or burrs on machined walls weaken welding strength. Based on shear fracture theory, the fracture form of honeycomb wall was determined to be shear fracture. A single factor cutting experiment with controlled cutting state of single tooth was designed. The Johnson-Cook model and a finite element simulation were established. The effect of cutting state parameters on stress distribution and morphology was explained, and the defect formation mechanism under ice fixation clamping milling was revealed. The research results show that the cutting-in angle and single-tooth cutting width significantly impact the stress distribution and morphology of the honeycomb wall shear section. At a 30° cutting-in angle, Y and Z direction tensile stress is lower. The shear section quality is satisfactory, with 95 % shear zone height and 24.77 μm cut-out burr height. At a 0.01 mm single-tooth width, overall stress on the honeycomb wall is minimal, at only 1.892GPa. The shear section quality is better, with 80 % shear zone height and 20.61 μm cut-out burr height. Shear zone height first decreases then increases with the cutting-in angle and is inversely proportional to single-tooth cutting width, while fracture zone height shows the opposite trend. Cut-out burr height is proportional to the cutting-in angle, single-tooth cutting width, and cutting depth. Cutting speed has a minimal effect on section quality. The shearing section quality of honeycomb wall can be improved by using smaller single-tooth cutting width, cutting-in angle and cutting depth and moderately increasing cutting speed.高温合金蜂窝芯具有优异的耐腐蚀、耐高温和抗冲击性能。它们用于极端条件下的关键飞机结构。为了降低蜂窝芯材料的应用难度，对样品进行切割是必不可少的。加工壁面上的断裂带或毛刺会削弱焊接强度。基于剪切断裂理论，确定蜂窝壁的断裂形式为剪切断裂。设计了单齿受控切削状态下的单因素切削实验。建立了Johnson-Cook模型并进行了有限元仿真。分析了切削状态参数对应力分布和形貌的影响，揭示了冰固夹铣削缺陷形成机理。研究结果表明：切削角度和单齿切削宽度对蜂窝壁剪切截面的应力分布和形貌有显著影响；当切削角为30°时，Y和Z方向的拉应力较低。剪切断面质量较好，剪切带高度为95% %，剪切毛刺高度为24.77 μm。当单齿宽度为0.01 mm时，蜂窝壁上的总应力最小，仅为1.892GPa。剪切断面质量较好，剪切带高度为80 %，剪切毛刺高度为20.61 μm。剪切带高度随切入角先减小后增大，与单齿切入宽度成反比，而断裂带高度则相反。切出毛刺高度与进刀角度、单齿切刀宽度、切刀深度成正比。切削速度对断面质量的影响很小。减小单齿切削宽度、切削入角和切削深度，适当提高切削速度，可提高蜂窝壁剪切断面质量。Design, experiment, and finite element analysis of bio-inspired novel 3D woven tubular compositesFangfang Wen, Yongfang Qian, Yuan Gao, Xinghai Zhou, Lihua Lyudoi:10.1016/j.compstruct.2024.118813仿生新型三维编织管状复合材料的设计、实验和有限元分析3D textile-structured tubular composites currently suffer from problems with single cross-sectional shapes and low energy absorption efficiency. To address the above problems, this study proposes a novel tubular structure inspired by the bamboo structure, characterized by a concentric nested structure of “double tubes & double ribs.” Bio-inspired novel 3D woven tubular composites (3D-WBBTC) with the above structures were prepared using the VARTM process, aiming to enhance the energy absorption of 3D woven tubular composites. The axial compression performance and energy absorption performance of 3D-WBBTC were studied using quasi-static axial compression tests and finite element numerical simulations. The results show that the specific energy absorption ranges from 7.41 to 11.59 J·g−1 and compression force efficiency ranges between 0.50 and 0.75, significantly improved compared to traditional 3D woven tubular composites. The damage mode of 3D-WBBTC is a hybrid damage mode of “local buckling of the tube wall & partial folding of the ribs,” which includes debonding of the fiber-resin interface, different forms of fiber breakage, and peeling, shedding, and cracking of the resin. It provides a new approach to the innovative design of 3D woven tubular composites.目前，三维纺织结构管状复合材料存在截面形状单一、吸能效率低等问题。为了解决上述问题，本研究提出了一种受竹结构启发的新型管状结构，其特点是“双管双肋”的同心嵌套结构。采用VARTM工艺制备了具有上述结构的仿生新型三维编织管状复合材料（3D- wbbtc），旨在提高三维编织管状复合材料的吸能能力。采用准静态轴压试验和有限元数值模拟相结合的方法研究了3D-WBBTC的轴压性能和吸能性能。结果表明：该复合材料的比能吸收范围为7.41 ~ 11.59 J·g−1，压缩力效率范围为0.50 ~ 0.75，与传统的三维编织管状复合材料相比有显著提高；3D-WBBTC的损伤模式为“管壁局部屈曲+肋部部分折叠”的混合损伤模式，包括纤维-树脂界面的脱粘、不同形式的纤维断裂以及树脂的剥落、脱落和开裂。为三维编织管状复合材料的创新设计提供了新的途径。Inverse design of triply periodic minimal surfaces structure based on point cloud generation networkYuanlong Wang, Qi Jin, Chenlong Zhang, Siyu Huang, Siyu Li, Guan Zhou, Chunyan Wang, Wanzhong Zhaodoi:10.1016/j.compstruct.2024.118814基于点云生成网络的三周期最小曲面结构反设计Nature-inspired materials, especially those derived from triply periodic minimal surfaces (TPMS), have garnered significant attention in the engineering field due to their unique topological properties. However, their applications are limited by the complexities of the design process. With the development of deep learning in the design of metamaterials, this study aims to address the issue of insufficient datasets related to metamaterials by constructing a point cloud dataset of TPMS cells and their equivalent elastic modulus. This dataset is used to train an improved Warping Generative Adversarial Networks (GAN) to learn the mapping relationship between the equivalent elastic modulus and structure. Subsequently, the generated TPMS cells are reconstructed, and their performance is validated through experiments and relevant evaluation metrics. This approach differs from traditional 2D and 3D dimensionality-reduction inverse design methods, as it allows for the retrieval of structures from the network outputs through simple point cloud reconstruction, thereby avoiding a complex modeling process. The introduced 3D structural inverse design method enables the generation of complex and realistic 3D structures, potentially advancing the development of metamaterials design.受自然启发的材料，特别是那些来自三周期最小表面（TPMS）的材料，由于其独特的拓扑特性，在工程领域受到了极大的关注。然而，它们的应用受到设计过程复杂性的限制。随着深度学习在超材料设计中的发展，本研究旨在通过构建TPMS单元及其等效弹性模量的点云数据集来解决与超材料相关的数据集不足的问题。该数据集用于训练改进的翘曲生成对抗网络（GAN）来学习等效弹性模量与结构之间的映射关系。随后，对生成的TPMS细胞进行重构，并通过实验和相关评价指标对其性能进行验证。这种方法不同于传统的2D和3D降维逆设计方法，因为它允许通过简单的点云重建从网络输出中检索结构，从而避免了复杂的建模过程。所介绍的三维结构逆设计方法能够生成复杂逼真的三维结构，有可能推动超材料设计的发展。Shear stiffness model for an innovative Y-shaped connector with UHPC grout in composite structuresYulong Ni, Menghan Hu, Zhenlei Jia, Qiang Handoi:10.1016/j.compstruct.2024.118817新型超高性能混凝土灌浆y形接头复合结构抗剪刚度模型Precast concrete deck panels (PCDPs) with shear pockets offer several advantages to accelerate bridge construction. In this paper, a Y-shaped connector was proposed, which was placed intermittently in the ultra-high-performance concrete (UHPC) shear pockets of PCDPs in composite structures. To assess the shear behavior of the Y-shaped connector, push-out tests were performed by varying plate width and thickness, diameter of the penetrating rebar and perfobond hole, and type of grout. The load-slip curves, failure modes, strain analysis, and shear behaviors were investigated. Then, validated finite element (FE) models were established to investigate the relationship between the shear stiffness and number of perfobond holes. Finally, the shear stiffness model of the Y-shaped connector considering the end-bearing resistance of the UHPC was proposed. The test results show that the Y-shaped connector with UHPC grout has excellent shear performance compared to the specimen with normal concrete (NC) grout. The shear stiffness of the Y-shaped connector is greatly influenced by the effective width of the perfobond plate. The shear stiffness of the Y-shaped connector increases significantly with the number of perfobond holes. The analytical model has a precise prediction for the shear stiffness of the Y-shaped connector.带有剪切袋的预制混凝土桥面板（pcdp）具有加速桥梁施工的几个优点。本文提出了一种y形接头，将其间歇放置在组合结构中pcdp的超高性能混凝土剪切孔中。为了评估y形接头的抗剪性能，通过改变板的宽度和厚度、穿透钢筋和穿孔的直径以及灌浆类型进行了推出试验。研究了荷载-滑移曲线、破坏模式、应变分析和剪切行为。然后，建立了验证的有限元模型，研究了剪切刚度与孔数之间的关系。最后，建立了考虑端部承载阻力的y形接头抗剪刚度模型。试验结果表明，与普通混凝土（NC）灌浆试件相比，UHPC灌浆y型接头具有优良的抗剪性能。y型连接器的抗剪刚度受穿孔板有效宽度的影响较大。随着孔数的增加，y型连接器的剪切刚度显著增加。该解析模型对y型连接件的剪切刚度有较精确的预测。A novel digital unit cell library generation framework for topology optimization of multi-morphology lattice structuresJinlong Liu, Zhiqiang Zou, Kang Gao, Jie Yang, Siyuan He, Zhangming Wudoi:10.1016/j.compstruct.2024.118824 一种用于多形态点阵结构拓扑优化的新型数字单元库生成框架Although single-unit cell lattice structures are commonly used in engineering, multi-morphology composite lattice structures offer enhanced mechanical properties and diverse functionalities by tailoring their microstructures. This study presents a novel framework for generating a digital unit cell library to optimize the design of multi-morphology lattice structures. The framework involves creating the library using modular encoding and an adjacency matrix while addressing connectivity constraints. A voxel model is employed to streamline the homogenization process of the various unit cells in the library. This homogenization dataset trains a Radial Basis Function Neural Network (RBFNN) to evaluate the elasticity tensor of the unit cells. The compliance of the multi-morphology lattice structure is minimized by identifying optimal unit cell volume fractions and types through topology optimization and 0–1 integer programming. The former utilizes sensitivity analysis via RBFNN to determine the optimal volume fractions, while the latter focuses on minimizing the element strain energy and considers constraints that satisfy the optimal volume fractions of unit cells. The effectiveness and feasibility of this method are demonstrated through three benchmark numerical examples. Experimental results from additive manufacturing samples show that the proposed multi-morphology lattice structures achieve a 44.24% increase in initial stiffness and a 47.70% increase in ultimate strength compared to single-unit cell lattice structures.虽然单单元晶格结构通常用于工程中，但多形态复合晶格结构通过调整其微观结构提供了增强的机械性能和多种功能。本研究提出了一种新的框架来生成数字单元胞库，以优化多形态晶格结构的设计。该框架涉及使用模块化编码和邻接矩阵创建库，同时解决连接约束。采用体素模型简化库中各单元细胞的均匀化过程。该均质化数据集训练径向基函数神经网络（RBFNN）来评估单元格的弹性张量。通过拓扑优化和0-1整数规划，确定最优的单位胞体积分数和类型，使多形态点阵结构的遵从性最小化。前者利用RBFNN的灵敏度分析来确定最优体积分数，而后者侧重于最小化单元应变能，并考虑满足单元胞最优体积分数的约束。通过三个基准算例验证了该方法的有效性和可行性。增材制造样品的实验结果表明，与单单元晶格结构相比，多形态晶格结构的初始刚度提高了44.24%，极限强度提高了47.70%。Rectangular seawater sea-sand concrete columns using steel-FRP composite bars and closed-type winding FRP ties: Axial behavior and confinement modelGang Xiao, Wei Tan, Shiwen Han, Peirong Mai, Jinping Oudoi:10.1016/j.compstruct.2024.118826采用钢-FRP复合筋和封闭式缠绕FRP筋的矩形海水海砂混凝土柱：轴向性能及约束模型Seawater sea-sand concrete (SWSSC) columns reinforced with steel-fiber reinforced polymer (FRP) composite bars (SFCBs) and closed-type winding FRP ties (CWFTs) are highly suitable for marine environments. However, due to limited research, the axial performance and confinement model of the columns have not been fully clarified. Therefore, axial compression tests of the columns in the study reveal that larger volumetric stirrup ratios and appropriate tie configurations can significantly enhance column ductility. Specifically, compared to columns with a 1.75% stirrup ratio, the strain ductility coefficients of columns with ratios of 3.44% and 4.55% increase by 54% and 195%, respectively. The coefficient of columns with B-configuration ties is 2.86 to 4.34 times that of columns with A-configuration ties. The impact of stirrups’ cross-sectional area and spacing on axial behavior is similar, and the effect of stirrups’ width-to-thickness ratio is minimal. Compared to steel-tie columns, CWFT columns with various tie configurations and volumetric stirrup ratios exhibit similar load–strain curves before the peak load and lower axial capacity. With the same stirrup ratio, steel-tie columns demonstrate better ductility than CWFT columns with A-configuration ties, but for B-configuration ties, the ductility coefficient of CWFT columns is 2.23 times that of steel-tie columns. Factors influencing the stress–strain curve of CWFT-confined concrete include the strength in the bent section, stirrup configuration, spacing, volumetric ratio, and elastic modulus of stirrups. Peak stress and strain are associated with the latter four factors, and the first four coefficients influence ultimate stress and strain. Formulas for calculating the axial capacity and confinement model have been derived and show good agreement with the experimental results. The bearing capacity, ductility and complete stress–strain curves of the columns under axial compression can be predicted, promoting the development of marine civil engineering.采用钢纤维增强聚合物（FRP）复合筋（sfcb）和封闭式缠绕FRP绑扎（CWFTs）加固海水海砂混凝土（SWSSC）柱非常适合海洋环境。然而，由于研究有限，对柱的轴向性能和约束模型尚未完全阐明。因此，本研究中柱的轴压试验表明，较大的体积箍筋比和适当的箍筋配置可以显著提高柱的延性。与配箍率为1.75%的柱相比，配箍率为3.44%和4.55%的柱的应变延性系数分别提高了54%和195%。b型系柱的系数是a型系柱的2.86 ~ 4.34倍。马镫横截面积和间距对轴向性能的影响相似，而马镫宽厚比的影响最小。与钢系柱相比，不同系箍结构和体积箍箍比的CWFT柱在峰值荷载前表现出相似的荷载-应变曲线，轴向承载力较低。在配箍比相同的情况下，钢系柱的延性优于a系CWFT柱，而b系CWFT柱的延性系数是钢系CWFT柱的2.23倍。影响cwft约束混凝土应力-应变曲线的因素包括弯曲截面强度、箍筋配置、间距、体积比和箍筋弹性模量。峰值应力和应变与后4个系数相关，前4个系数影响极限应力和应变。推导了轴向承载力的计算公式和约束模型，与实验结果吻合较好。可以预测柱在轴压作用下的承载力、延性和完整应力-应变曲线，促进海洋土木工程的发展。Composites Part A: Applied Science and ManufacturingCharacterising pore networks and their interrelation with the fibre architecture in unidirectional compositesS. Gomarasca, D.M.J. Peeters, B. Atli-Veltin, T. Slange, G. Ratouit, C. Dransfelddoi:10.1016/j.compositesa.2024.108669 表征孔隙网络及其与单向复合材料纤维结构的相互关系This work proposes a methodology for the characterisation of complex pore features in unidirectional composite prepregs, and provides insights into the interaction between fibre architecture and pores. The method showcased allows to compare spatial distributions at a three-dimensional level, highlighting in the tape analysed a significant correspondence between regions of elevated tortuosity and increased pore fractions. Regions associated with highly tortuous meandering fibres exhibit a pronounced association with porosity located both in the bulk and at the tape surface, suggesting a strong interaction between non-collective fibre displacement and the probability of pore location. Furthermore, our study quantifies the length scale of feature propagation, shedding light on the spatial extent of microstructural pore occurrence within the composite. These findings have significant implications from a characterisation perspective to aid modelling approaches and manufacturing processes for high-performance composite prepregs tapes.这项工作提出了一种在单向复合预浸料中表征复杂孔隙特征的方法，并提供了对纤维结构和孔隙之间相互作用的见解。所展示的方法可以在三维水平上比较空间分布，在磁带中突出显示了扭曲度升高和孔隙分数增加的区域之间的显著对应关系。与高度弯曲的弯曲纤维相关的区域显示出与体积和胶带表面孔隙率的明显关联，这表明非集体纤维位移与孔隙位置概率之间存在强烈的相互作用。此外，我们的研究量化了特征传播的长度尺度，揭示了复合材料中微观结构孔隙分布的空间范围。这些发现对高性能复合预浸料胶带的建模方法和制造工艺具有重要意义。Impact damage and low temperature effects on carbon fiber/epoxy joints: A comparative study of hybrid bolted/bonded and bolted configurations with cross-ply and angle-ply laminatesMahsa Seyednourani, Sercan Akgun, Hasan Ulus, Mehmet Yildiz, Hatice S. Sasdoi:10.1016/j.compositesa.2024.108677碳纤维/环氧树脂接头的冲击损伤和低温效应：交叉层合板和角层合板混合螺栓/粘结和螺栓配置的对比研究This study investigates the tensile and tensile after impact (TAI) performance of hybrid bolted/bonded (HBB) and only bolted (OB) carbon fiber/epoxy composite joints with cross-ply (CP) and angle-ply (AP) stacking sequences under low-temperature (LT) conditions. The focus is on the behavior of these joints under low temperatures with barely visible impact damage (BVID), relevant to aerospace and high-performance industries. In situ acoustic emission (AE) analysis and fractographic examinations synergistically evaluate the effects of LT (−55 °C) and BVID (10 J energy level) on these joints. Results indicate that HBB-CP intact joints exhibit higher load-bearing capacity at LT due to increased adhesive and matrix stiffness but demonstrate more brittle responses. The combined impact of low temperature and impact loading significantly affects impacted CP joints, leading to notable damage and reduced load-bearing capacity. Although HBB-CP joints are more susceptible to BVID than OB-CP joints, they still outperform overall. AE and fractographic analyses reveal fiber-related failures in CP laminates and matrix/interface failures in AP laminates, with increased matrix cracking at low temperatures. This research provides a comprehensive analysis of the interplay between impact dynamics, temperature variations, and stacking sequence configurations on hybrid and bolted composite joints.本文研究了交叉铺层（CP）和角铺层（AP）复合碳纤维/环氧复合材料接头在低温（LT）条件下的拉伸和冲击后拉伸（TAI）性能。重点是研究这些接头在低温下几乎不可见的冲击损伤（BVID）的行为，这与航空航天和高性能行业相关。现场声发射（AE）分析和断口学检查协同评估了低温（- 55 °C）和BVID（10 J能级）对这些节理的影响。结果表明，HBB-CP完整接头由于黏合剂和基体刚度的增加，在LT时表现出更高的承载能力，但表现出更多的脆性响应。低温和冲击载荷的联合作用对冲击CP节点影响显著，导致CP节点损伤显著，承载能力降低。尽管HBB-CP关节比OB-CP关节更容易受到BVID的影响，但它们的总体表现仍优于OB-CP关节。声发射和断口分析表明，CP层压板的纤维相关失效和AP层压板的基体/界面失效，在低温下基体开裂增加。该研究全面分析了混合和螺栓复合材料接头的冲击动力学、温度变化和堆叠顺序构型之间的相互作用。Composites Part B: EngineeringThermo-mechanical analysis of extreme thermal loads on a flax fiber composite sandwich footbridgeMarco Manconi, Ali Shahmirzaloo, S.P.G. Faas Moonendoi:10.1016/j.compositesb.2024.112084亚麻纤维复合材料夹层人行桥极端热载荷热力学分析In this study, a framework is proposed to perform a thermo-mechanical analysis under an extreme thermal weather event. The objective is to evaluate the temperature-induced responses as they represent a critical factor in the durability and safety of bridges. The 15m flax fiber composite sandwich footbridge case study used for validation is instrumented with 82 fiber Bragg grating (FBG) sensors and 8 thermocouples, and it is located in Almere, the Netherlands. The structural response is evaluated under an extreme weather condition obtained through an extreme value analysis (EVA) on an hourly 18-year dataset of solar radiation and air temperature. A peak-over-threshold (POT) strategy is adopted to extract extreme values. The extremes are fitted by a generalized Pareto distribution (GPD) to obtain the 50-year temperature and global solar radiation. The framework combines environmental data, point-by-point solar radiation analysis with sun sheltering, 3D transient heat transfer, and a sequentially coupled (one-way) mechanical analysis in Abaqus. The thermal simulation accuracy is first verified against in-situ measurements. Subsequently, the extreme thermal load is applied and quantified. The results prove that the resultant stresses are significant (up to 26%) concerning the compressive, tensile, and shear characteristic strength of the lamina.在本研究中，提出了在极端热天气事件下进行热力学分析的框架。目的是评估温度引起的反应，因为它们代表了桥梁耐久性和安全性的关键因素。用于验证的15米亚麻纤维复合材料夹层人行桥案例研究位于荷兰阿尔米尔，配备了82个光纤布拉格光栅（FBG）传感器和8个热电偶。通过对每小时18年太阳辐射和气温数据集的极值分析（EVA），在极端天气条件下评估结构响应。采用峰值超过阈值（POT）策略提取极值。用广义帕累托分布（GPD）拟合极值，得到50年的温度和全球太阳辐射。该框架结合了环境数据、逐点太阳辐射分析和遮阳、3D瞬态传热以及Abaqus中的顺序耦合（单向）力学分析。首先通过现场测量验证了热模拟的精度。随后，对极端热负荷进行了应用和量化。结果表明，复合应力对试件的抗压、抗拉、抗剪特征强度影响较大（达26%）。Lightweight composite meta-lattice structures with inertial amplification design for broadband low-frequency vibration mitigationLanhe Xu, Zhou Yang, Zhilin Zhang, Eric Li, Jie Zhou, Bing Lidoi:10.1016/j.compositesb.2024.112091 具有惯性放大设计的轻型复合元晶格结构用于宽带低频振动抑制Designing lightweight structures with superior low-frequency vibration attenuation and high mechanical properties remains a significant challenge. Here, we propose a novel design strategy for lightweight meta-lattice sandwich structures that not only exhibit enhanced low-frequency vibration attenuation but also maintain optimal load-bearing performance. By introducing an inertial amplification mechanism, we achieve a broadening effect on the low-frequency bandgap. We develop analytical models based on the Rayleigh-energy method and cantilever-beam equivalence to theoretically predict the dynamic properties. Glass fiber reinforced (GFR) nylon composite meta-lattice sandwich panels are fabricated via selective laser sintering (SLS) 3D printing. A self-developed, fully automated laser-vibration-measurement platform is employed to confirm the significant improvement in broadband low-frequency vibration-reduction performance of the proposed meta-lattice structures. The practical application of a meta-lattice sandwich tube demonstrates its effectiveness in providing low-frequency broadband vibration attenuation and high load-bearing capacity, while maintaining a lightweight design.设计具有优异的低频振动衰减和高机械性能的轻量化结构仍然是一个重大挑战。在这里，我们提出了一种新的设计策略，轻质元晶格夹层结构不仅具有增强的低频振动衰减，而且保持最佳的承载性能。通过引入惯性放大机制，实现了低频带隙的展宽效应。我们建立了基于瑞利能量法和悬臂梁等效的解析模型，从理论上预测了结构的动力特性。采用选择性激光烧结（SLS） 3D打印技术制备了玻璃纤维增强（GFR）尼龙复合元晶格夹层板。采用自主开发的全自动激光振动测量平台，证实了所提出的元晶格结构在宽带低频减振性能方面的显著改善。元晶格夹层管的实际应用表明，在保持轻量化设计的同时，它可以有效地提供低频宽带振动衰减和高承载能力。Composites Science and TechnologyA Flexible Metamaterial Based on CNTs/Cellulose Aerogels for Broadband and Ultra-lightweight Microwave AbsorbersLifei Du, Yuekun Li, Qian Zhou, Tiantian Shi, Liangqing Zhang, Jiong Wang, Xinlei Wang, Xiaomeng Fandoi:10.1016/j.compscitech.2024.111024 基于碳纳米管/纤维素气凝胶的宽带和超轻量微波吸收材料Lightweight aerogel composites derived from biomass represent a promising candidate for electromagnetic wave absorption. In this study, the CNTs/cellulose aerogels three-dimensional (3D) sheet-networks were prepared via the homogenous freezing method, and a two layered meta-structure with periodic square resin shells was designed and optimized to further improve the absorbing properties of the CNTs/cellulose aerogels. The metamaterial absorber with the prepared CNTs/cellulose aerogel filling into the shells achieved ultra-broadband electromagnetic wave absorption in the frequency range of 4.36-40 GHz with a thickness of 8.5 mm (The relative bandwidth of the fabricated metamaterial absorber reaches 160.7%). Particularly, the radar cross-section properties of the curved CNTs/cellulose aerogel metamaterial absorber were investigated, revealing its application potential for conformal absorption devices, which would provide a new strategy for the design of ultra-lightweight conformal materials with broadband electromagnetic absorption materials.生物质制备的轻质气凝胶复合材料是一种很有前途的电磁波吸收材料。本研究通过均相冷冻法制备了CNTs/纤维素气凝胶三维（3D）片网，并对具有周期性方形树脂壳的两层元结构进行了设计和优化，进一步提高了CNTs/纤维素气凝胶的吸波性能。将制备的CNTs/纤维素气凝胶填充到壳体中，实现了频率为4.36-40 GHz、厚度为8.5 mm的超宽带电磁波吸收（制备的超材料吸波器的相对带宽达到160.7%）。研究了弯曲型CNTs/纤维素气凝胶超材料吸收体的雷达截面特性，揭示了其在保形吸收器件中的应用潜力，为设计具有宽带电磁吸收材料的超轻质保形材料提供了新策略。 来源：复合材料力学仿真Composites FEM