【新文速递】2024年7月26日复合材料SCI期刊最新文章

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今日更新：Composite Structures 2 篇，Composites Part B: Engineering 1 篇，Composites Science and Technology 1 篇

Composite Structures

Active vibration control effect of 3D printed cruciform honeycomb laminates based on fiber-reinforced shape memory polymer

Peilei Xu, Xin Lan, Chengjun Zeng, Jinsong Leng, Yanju Liu

doi:10.1016/j.compstruct.2024.118415

基于纤维增强形状记忆聚合物的3D打印十字形蜂窝层压板的主动振动控制效果

Honeycomb structures offer the benefits of being lightweight and having high out-of-face compressive stiffness, making them a popular choice for aerostructures. The present study delineates the design and active vibration control effect for fiber-reinforced cruciform honeycomb laminates (CHLs) characterized by variable parameters. Employing a continuous fiber 3D printer, carbon fiber filament and shape memory polymers (SMPs) were utilized in the fabrication of the specimens. Differential equations of motion for CHLs were deduced from Kirchhoff plate theory. To ascertain their frequency response, these laminates were subjected to a sinusoidal swept frequency excitation. Subsequently, the classical proportional integral derivative (PID) program was employed to scrutinize the efficacy of closed-loop active vibration control on CHLs. The investigation extended to analyzing the impact of active vibration control across laminates with disparate parameters, including an examination of the convergence speed during vibration control procedures. A comparative analysis of simulated versus experimental data revealed a substantial consonance between the two, thereby corroborating the accuracy of the experimental findings. This study offers crucial insights and reference value for the utilization of CHLs in the aerospace industry.

蜂窝结构具有重量轻，抗压刚度高的优点，使其成为航空结构的热门选择。本文研究了变参数纤维增强十字形蜂窝层合板的设计及其振动主动控制效果。采用连续纤维3D打印机，碳纤维长丝和形状记忆聚合物(SMPs)用于样品的制造。利用基尔霍夫板理论推导了chl的运动微分方程。为了确定其频率响应，对这些层合板进行了正弦扫频激励。随后，采用经典的比例积分导数(PID)程序考察了闭环振动主动控制对CHLs的效果。研究扩展到分析具有不同参数的层压板的主动振动控制的影响，包括检查振动控制过程中的收敛速度。模拟数据与实验数据的对比分析揭示了两者之间的一致性，从而证实了实验结果的准确性。本研究为CHLs在航空航天工业中的应用提供了重要的见解和参考价值。

Mechanical characteristics of Si/SiC graded ceramic lattice structures with a triply periodic minimal surface fabricated by laser powder bed fusion

Siqi Wu, Guanglin Sha, Lei Yang, Changshun Wang, Qing Duan, Chunze Yan, Yusheng Shi

doi:10.1016/j.compstruct.2024.118417

激光粉末床熔合制备具有三周期最小表面的Si/SiC梯度陶瓷晶格结构的力学特性

SiC graded ceramic lattice structures (GCLSs) have attracted rising attention owing to outperformed merits including ultra-lightweight and excellent specific strength compared with uniform ceramic lattice structures (UCLSs). In this study, Si/SiC Gyroid GCLSs with variable relative densities (35 % and 45 %) and different gradient directions were designed and fabricated via laser powder bed fusion combined with liquid silicon infiltration techniques. 35 % and 45 % UCLSs were also prepared as a reference. The manufacturing precision and mechanical responses of these CLSs were systematically investigated through compressive tests and micro-computed tomography analysis. The mechanical performances of 35 % GCLSs are lower than that of 35 % UCLSs. The weaker load-bearing capacity in the upper portion and the stress concentration in the inclined load-bearing surface lead to the knockdown of mechanical properties for 35 % GCLSs. The nonlinear superposition of mechanical properties in 45 % GCLSs is the main reason for the superior mechanical performance of 45 % GCLSs compared to 45 % UCLSs. Besides, various theoretical models and finite element simulations were implemented to evaluate the mechanical properties of SiC CLSs. The comparison of compressive strength with other ceramic porous structures emphasized the exceptional mechanical properties (16.07 MPa for 35 % UCLSs and 22.91 MPa for 45 % GCLSs) of Si/SiC CLSs.

SiC梯度陶瓷晶格结构(GCLSs)由于其超轻、比强度优异等优点而受到越来越多的关注。本研究采用激光粉末床熔融结合液态硅渗透技术，设计并制备了相对密度(35 %和45 %)不同梯度方向的Si/SiC Gyroid gcls。制备了35 %和45 %的UCLSs作为参考。通过压缩试验和微计算机断层扫描分析，系统地研究了这些cls的制造精度和力学响应。35% % gcls的力学性能低于35% % UCLSs。35% % gcls的上部承载能力较弱和倾斜承载面应力集中导致其力学性能下降。45 % gcls力学性能的非线性叠加是45 % gcls力学性能优于45 % ucls的主要原因。此外，采用各种理论模型和有限元模拟方法对SiC类材料的力学性能进行了评价。与其他陶瓷多孔结构的抗压强度比较，突出了Si/SiC多孔结构优异的力学性能(35 % ucls为16.07 MPa, 45 % gcls为22.91 MPa)。

Composites Part B: Engineering

Exploring thermal and in-situ mechanical properties of flexible 2D tungsten disulfide foam-polymer composite for thermal management

Kazue Orikasa, Ambreen Nisar, Preyojon Dey, Luiza Benedetti, Tyler Dolmetsch, Tony Thomas, Arvind Agarwal

doi:10.1016/j.compositesb.2024.111743

用于热管理的柔性二维二硫化钨泡沫-聚合物复合材料的热性能和原位力学性能研究

In the realm of thermal management applications, there is a growing need for flexible materials that can efficiently dissipate heat. Polymer composites incorporating two-dimensional (2D) materials offer promising solutions due to their superior thermal and mechanical properties. Tungsten disulfide (WS2) is an excellent filler candidate for polymer composites due to its superior thermal conductivity, mechanical strength, and electrical properties. Unlike graphene, WS2 has a tunable bandgap, exhibits higher thermal resistance in inert atmospheres, is an effective lubricant over a wide temperature range of −190°C to over 800°C, and offers superior gamma radiation shielding. However, high-density 2D material polymer composite fabrication faces challenges due to the agglomeration tendency and sedimentation of heavy nanomaterials within the polymer matrix. This poor dispersion stability negatively impacts the performance and reliability of the composite. We developed a flexible WS2 foam-polydimethylsiloxane (PDMS) composite via freeze drying and vacuum-assisted infiltration, which not only overcomes fabrication challenges but also enables unique filler reinforcement foam designs. The thermal conductivity of WS2-PDMS foam was 1.57 times higher than that of neat PDMS. These thermal properties were modeled using the Lewis-Nielsen model. In-situ tensile tests were conducted to understand the mechanical reinforcing behavior and failure mechanisms of WS2 foam, which were further studied using the Gibson and Ashby model. The addition of WS2 into PDMS resulted in an elastic modulus 1.56 times higher than that of neat PDMS. The composite's mechanical properties were analyzed using the Halpin-Tsai model. These findings highlight the potential of WS2-PDMS composites for flexible thermal management applications.

在热管理应用领域，人们越来越需要能够有效散热的柔性材料。含有二维（2D）材料的聚合物复合材料因其卓越的热性能和机械性能，为我们提供了前景广阔的解决方案。二硫化钨（WS2）具有优异的导热性、机械强度和电气性能，是聚合物复合材料的理想填充物。与石墨烯不同，WS2 具有可调带隙，在惰性气氛中表现出更高的耐热性，在 -190°C 至 800°C 的宽温度范围内是一种有效的润滑剂，并具有优异的伽马辐射屏蔽性能。然而，高密度二维材料聚合物复合材料的制造面临着挑战，原因是重纳米材料在聚合物基质中容易团聚和沉淀。分散稳定性差会对复合材料的性能和可靠性产生负面影响。我们通过冷冻干燥和真空辅助浸润技术开发了一种柔性 WS2 泡沫-聚二甲基硅氧烷（PDMS）复合材料，不仅克服了制造难题，还实现了独特的填充增强泡沫设计。WS2-PDMS 泡沫的热导率是纯 PDMS 的 1.57 倍。这些热性能是通过 Lewis-Nielsen 模型模拟出来的。为了了解 WS2 泡沫的机械增强行为和破坏机制，我们进行了原位拉伸试验，并使用 Gibson 和 Ashby 模型对其进行了进一步研究。在 PDMS 中添加 WS2 后，其弹性模量是纯 PDMS 的 1.56 倍。使用 Halpin-Tsai 模型分析了复合材料的机械性能。这些发现凸显了 WS2-PDMS 复合材料在柔性热管理应用方面的潜力。

Composites Science and Technology

Environmental-friendly and fast production of ultra-strong phenolic aerogel composite with superior thermal insulation and ablative-resistance

Can Wu, Lumeng Wang, Xiaojie Yan, He Huang, Yiwu Pan, Hebing Wang, Wei Wang, Shuai Yuan, Jiahui Fan, Xiangyu Jin, Changqing Hong, Xinghong Zhang

doi:10.1016/j.compscitech.2024.110776

环保、快速生产具有优异保温、耐烧蚀性能的超强酚醛气凝胶复合材料

There is an urgent need for developing “low-carbon” synthesis technology to prepare aerogel composites with both high mechanical strength and efficient thermal insulation for applications of modern aerospace and energy saving. Herein, we propose a strategy for fabricating lightweight phenolic aerogel composites with thick-united connected nano-structure and good aerogel-fiber interfacial compatibility. The specific micro-nano structure and optimized material synergism endow the aerogel composites with an ultrahigh tensile strength (12.84±0.64 MPa), bending strength (24.69±1.96 MPa) and compressive strength (1.7±0.053 MPa under 5% strain), as well as low thermal conductivity (0.0541±0.0003 W/(m·K)). The aerogel composites behave excellent ablation-resistance under the flame of 1200 °C within 30 min and maintain a cold-side temperature of 56.07 °C without any shape change. The rigid-flexible comminated aerogel composites open up a new technical track for developing lightweight thermal protective composites with high strength, toughness, and efficient thermal insulation demanded in extreme environments.

迫切需要发展“低碳”合成技术，制备既具有高机械强度又具有高效保温性能的气凝胶复合材料，以满足现代航空航天和节能应用的需要。在此，我们提出了一种具有厚连接纳米结构和良好的气凝胶-纤维界面相容性的轻质酚醛气凝胶复合材料的制备策略。特殊的微纳结构和优化的材料协同作用使气凝胶复合材料具有超高的抗拉强度(12.84±0.64 MPa)、抗弯强度(24.69±1.96 MPa)和抗压强度(5%应变下1.7±0.053 MPa)和低导热系数(0.0541±0.0003 W/(m·K))。该气凝胶复合材料在1200℃火焰下30 min内具有优异的耐烧蚀性能，冷侧温度为56.07℃时无任何形状变化。刚柔混合气凝胶复合材料为开发具有高强度、高韧性和高效绝热的轻质热防护复合材料开辟了一条新的技术道路。

来源：复合材料力学仿真Composites FEM

【新文速递】2024年7月31日固体力学SCI期刊最新文章

今日更新：Thin-Walled Structures 4 篇Thin-Walled StructuresDESIGN OF COLD FORMED C SECTION BEAMS WITH ELONGATED CIRCULAR OPENINGS BASED ON TESTSR M Lawson, M Stergiopoulos, M Rowelldoi:10.1016/j.tws.2024.112256基于试验的细长圆孔冷弯c截面梁设计A design method to determine the shear resistance of elongated web openings in cold formed C sections is presented, that is based on Vierendeel bending in the web-flange Tee sections. The results of 6 tests on pairs of C section beams with stiffened and unstiffened openings of 155mm depth and 220mm length are presented. The tests also included a beam with closely spaced elongated openings and a comparative test on a plain C section. The tests showed that the bending resistance of the beam with stiffened openings was close to that of the plain C section.The design method is based on a derived formula for the normal stresses acting on radial planes around the circular part of the elongated opening. The results are compared to the stresses at an equivalent rectangular opening. It is proposed that in Vierendeel bending, buckling at the unstiffened openings may be represented as an equivalent ‘strut’ with an effective length of 0.3 x opening depth. The post-buckling resistance may take account of the redistribution of moments around the elongated openings. It was also found that for the tested beams, the additional shear and bending deflection due to each elongated opening was approximately 3% of the plain beam deflection.提出了一种确定冷弯C型钢腹板开孔抗剪能力的设计方法，该方法基于腹板法兰三通截面的纵向弯曲。给出了6组开孔加筋和开孔不加筋的C型钢对梁的试验结果，开孔深度为155mm，开孔长度为220mm。测试还包括一个具有紧密间隔的细长开口的梁和在普通C截面上的比较测试。试验结果表明，加筋开孔梁的抗弯性能与普通C截面接近。设计方法是基于作用在细长开口圆形部分周围径向平面上的法向应力的推导公式。结果与等效矩形开口下的应力进行了比较。有人提出，在Vierendeel弯曲中，未加筋开口处的屈曲可以表示为等效的“支柱”，其有效长度为0.3 x开口深度。后屈曲阻力可以考虑弯矩在细长开口周围的重新分布。还发现，对于测试梁，由于每个拉长开口的额外剪切和弯曲挠度约为普通梁挠度的3%。Development of a novel full-scaled self-centering brace with notched steel tubesGuozu Zheng, Jianping Han, Dawei Li, Yan Shidoi:10.1016/j.tws.2024.112269新型全尺寸缺口钢管自定心支撑的研制A novel self-centering brace with a notched steel tube (SCB-NST) was developed and experimentally studied. The proposed SCB-NST consists of a novel notched steel tube (NST) for energy dissipation and disc springs for self-centering, respectively. Three full-scaled specimens were tested to investigate the hysteresis behavior under cyclic loading. These specimens include a brace with NST only, a brace with disc spring only, and an SCB-NST. The first two tests were specifically conducted to obtain the contributions of the NST and disc springs alone, respectively. The test results illustrate that the first proposed NST displays excellent energy dissipation and deformation capabilities. The proposed SCB-NST exhibits a stable flag-shaped hysteresis behavior, distinguished self-centering, and significant energy dissipation capacity without residual displacement. Furthermore, experimental findings reveal that the disc spring functions as a secondary defensive line of the SCB-NST system upon sudden failure of the NST. The cyclic test of the brace with disc spring only shows that the friction between the disc springs should not be neglected, especially when quantities of large-diameter disc springs are stacked. The modular design of the proposed SCB-NST facilitates the replacement of energy-dissipating components, allowing for efficient maintenance and ultimately achieving the design objective of promoting reusability and resource conservation. The SCB-NST equipped with two different ultimate displacements has been confirmed through finite element analysis to have three defense lines, which improves the reliability and redundancy of the SCB-NST system. The parametric finite element analysis results reveal that the thickness of the energy-dissipation ring has the most significant influence on the load-bearing capacity and energy-dissipation capability of the SCB-NST. Concurrently, the pre-pressed force of the disc spring is crucial for eliminating the residual displacement of the SCB-NST.研制了一种新型缺口钢管自定心支撑，并进行了实验研究。所提出的SCB-NST由一种新型的缺口钢管(NST)和碟形弹簧组成，分别用于耗能和自定心。试验研究了3个试件在循环荷载作用下的滞回特性。这些样品包括仅带NST的支架，仅带碟形弹簧的支架和SCB-NST。前两个测试是专门进行的，分别获得了NST和碟形弹簧单独的贡献。试验结果表明，所提出的NST具有良好的耗能和变形能力。所提出的SCB-NST具有稳定的旗形迟滞行为、显著的自定心和显著的无残余位移的能量耗散能力。此外，实验结果表明，在NST突然失效时，碟形弹簧可作为SCB-NST系统的次级防线。盘形弹簧支撑的循环试验表明，盘形弹簧之间的摩擦不可忽视，特别是当大量大直径盘形弹簧堆叠时。拟议的SCB-NST的模块化设计便于更换耗能组件，从而实现高效维护，最终实现促进可重复使用和节约资源的设计目标。采用两种不同极限位移的SCB-NST，通过有限元分析确定其具有三道防线，提高了SCB-NST系统的可靠性和冗余性。参数化有限元分析结果表明，消能环的厚度对SCB-NST的承载能力和消能能力的影响最为显著。同时，碟形弹簧的预压力对于消除SCB-NST的残余位移至关重要。Peridynamic formulations for planar arbitrarily curved beams with Euler-Bernoulli beam modelZwe Yan Aung, Duy Vo, Pana Suttakul, Elena Atroshchenko, Tinh Quoc Bui, Jaroon Rungamornratdoi:10.1016/j.tws.2024.112278基于欧拉-伯努利梁模型的平面任意弯曲梁的周动力表达式This study presents two peridynamic formulations for analysis of planar arbitrarily curved beams using kinematic assumptions of Euler-Bernoulli beam model. Only displacement components of the beam axis are considered as kinematic unknowns. The principle of virtual work is used to derive equilibrium equations and boundary conditions. The equilibrium equations are presented in two forms, i.e., one in terms of cross-sectional stress resultants and one in terms of displacement components of the beam axis. Then, two peridynamic formulations are developed respectively from two forms of equilibrium equations by employing peridynamic functions, which are constructed with the concept of peridynamic differential operators. Several examples are presented to elucidate the performance of the proposed formulations in some regards, i.e., numerical precision, convergence properties, and robustness with respect to the membrane locking effect.本文利用欧拉-伯努利梁模型的运动学假设，提出了两种平面任意弯曲梁的周动力分析公式。只有梁轴的位移分量被认为是运动学未知数。利用虚功原理推导了平衡方程和边界条件。平衡方程有两种形式，即一种是截面应力结果的形式，另一种是梁轴位移分量的形式。在此基础上，利用周期动力学微分算子的概念构造了周期动力学函数，由两种形式的平衡方程分别推导出两个周期动力学表达式。提出了几个例子来阐明所提出的配方在某些方面的性能，即，数值精度，收敛特性和关于膜锁定效应的鲁棒性。Global buckling of S35657 austenitic stainless steel welded box- and I-section long columns under axial compressionShengjie Duan, Yiwen Wu, Shenggang Fan, Ganping Shu, Xianyun Shi, Jingzhong Tongdoi:10.1016/j.tws.2024.112281S35657奥氏体不锈钢焊接箱式和工字截面长柱在轴压作用下的整体屈曲Due to its remarkable combination of high yield strength and cost-effectiveness, S35657 austenitic stainless steel has gained increasing attention in the field of construction engineering. This paper delves into the global stability performance of S35657 stainless steel welded long columns. Leveraging test results from 13 welded long columns, consisting of 4 welded box-section columns and 9 welded I-section columns, a numerical simulation analysis was conducted to scrutinize the bearing capacity and failure modes of each specimen. Utilizing validated numerical models, a parametric analysis was undertaken, exploring factors such as cross-sectional classification, slenderness ratio and initial imperfection. Subsequently, the buckling curves for S35657 austenitic stainless steel welded box-section and I-section long columns, both around the major and minor axes, were evaluated using existing test results and numerical outcomes. Through data fitting and reliability analysis, buckling curves tailored to S35657 austenitic stainless steel welded box-section and I-section long columns for global buckling were proposed for the first time, providing guidance for relevant designs based on the European code (prEN 1993-1-4), the American code (SEI/ASCE 8-22) and the Chinese specification (CECS 410: 2015).由于其高屈服强度和成本效益的显著结合，S35657奥氏体不锈钢在建筑工程领域得到了越来越多的关注。本文研究了S35657不锈钢焊接长柱的整体稳定性能。利用13根焊接长柱(其中4根焊接箱形截面柱和9根焊接工字截面柱)的试验结果，对各试件的承载力和破坏模式进行了数值模拟分析。利用验证的数值模型，对截面分类、长细比和初始缺陷等因素进行了参数化分析。随后，利用已有的试验结果和数值结果，对S35657奥氏体不锈钢焊接的箱形截面和工字截面长柱在主轴和小轴周围的屈曲曲线进行了评估。通过数据拟合和可靠性分析，首次提出了适合S35657奥氏体不锈钢焊接箱形截面和工字截面长柱整体屈曲的屈曲曲线，为基于欧洲规范(prEN 1993-1-4)、美国规范(SEI/ASCE 8-22)和中国规范(CECS 410: 2015)的相关设计提供了指导。来源：复合材料力学仿真Composites FEM