【新文速递】2024年4月11日复合材料SCI期刊最新文章

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

Composite Structures

Optimization of multi-layered composites against ballistic impact: A mesoscale approach

Shashwat Kapoor, Sonalisa Ray, Jagdish Prasad Sahoo, Yugal Kishor Joshi

doi:10.1016/j.compstruct.2024.118097

多层复合材料抗弹道冲击优化:中尺度方法

There has been an urgent need to develop and analyse multi-layered composite structures with varying material properties to withstand projectile impact. The proposed study focuses on the optimization of the multi-layer composite to achieve maximum resistance/energy dissipation. This study investigates the mechanical performance of the proposed multi-layered composite configuration under high strain rate loading through a computational approach. The proposed multi-layered structure incorporates layers of reinforced concrete, boulders, an elastomer layer, an ultra-high-performance concrete panel, and a layer of steel plate. A mesoscale-based approach has been developed for the layer comprising boulders and mortar. A total of six different configurations have been considered to arrive at the most efficient one against projectile impact. Optimization of the proposed configurations has been done by utilizing the concepts of specific energy absorption and shock impedance. Additionally, the fracture and damage characteristics of each configuration are also studied. Ductile hole enlargement in the sandy soil layer, fragmentation failure in the boulders, petaling failure in the steel plate, and spalling failure in the concrete layer have been observed. Based on the specific energy absorption and shock impedance approaches, the optimum laying sequence for the ballistic impact of each material is suggested.

迫切需要开发和分析具有不同材料性能的多层复合结构以承受弹丸冲击。本研究的重点是优化多层复合材料，以达到最大的阻力/能量耗散。本研究通过计算方法研究了所提出的多层复合材料结构在高应变率载荷下的力学性能。提议的多层结构包括钢筋混凝土层、巨石层、弹性体层、超高性能混凝土板和一层钢板。一种基于中尺度的方法已被开发用于包含巨石和砂浆的层。总共考虑了六种不同的配置，以达到对抗弹丸冲击的最有效配置。利用比能量吸收和冲击阻抗的概念对所提出的结构进行了优化。此外，还研究了每种结构的断裂和损伤特征。观察到砂土层韧性孔扩大、巨石碎裂破坏、钢板花瓣破坏、混凝土层剥落破坏。基于比能吸收法和冲击阻抗法，提出了各种材料在弹道冲击下的最佳敷设顺序。

Composites Part A: Applied Science and Manufacturing

Influence of carbon black surface characteristics on CB-NR interfacial interaction: Molecular simulation and experimental study

Jihai Xiao, Ziyuan Zhang, Yajie Luan, Sizhu Wu, Youping Wu

doi:10.1016/j.compositesa.2024.108198

炭黑表面特性对CB-NR界面相互作用的影响:分子模拟与实验研究

Carbon black (CB) is the most widely used reinforcing filler in rubber industry, but the effects of CB surface characteristics on interfacial interaction of CB-filled rubber composites are still not fully described. Combined the experimental and molecular simulation techniques, the aim of this study is to individually investigate the influence of various CB surface characteristics, such as surface area, surface crystallite size, roughness and surface energy, on CB-natural rubber (NR) interfacial interaction to obtain a deep interpretation on the properties of rubber composites. Experimental results showed that the specific surface area is the primary factor affecting overall CB-NR interaction, followed by filler network. Meanwhile, CB surface model with different roughness based on experimental parameters were constructed, and the simulation results revealed that CB-NR interfacial interaction mainly occurred at the interface 2–3 nm. The binding energy distribution on CB surface was analyzed, and rough region is weaker than crystal region and amorphous region. The strongest binding sites are located at the junction of rough region and amorphous region. The results in this study are expected to provide a theoretic guide for optimizing the CB characteristics and developing new rubber-grade CB.

炭黑是橡胶工业中应用最广泛的补强填料，但炭黑表面特性对炭黑填充橡胶复合材料界面相互作用的影响尚未得到充分的研究。本研究将实验技术与分子模拟技术相结合，分别研究CB-天然橡胶(NR)的表面表面积、表面晶粒尺寸、粗糙度和表面能等不同表面特征对CB-天然橡胶(NR)界面相互作用的影响，从而对橡胶复合材料的性能进行深入的解释。实验结果表明，比表面积是影响CB-NR整体相互作用的主要因素，其次是填料网络。同时，基于实验参数构建了不同粗糙度的CB表面模型，仿真结果表明CB- nr界面相互作用主要发生在2 ~ 3 nm界面处。分析了炭黑表面的结合能分布，发现粗糙区比结晶区和非晶态区弱。最强的结合位点位于粗糙区和非晶态区交界处。研究结果可为优化丁基橡胶性能和开发新型橡胶级丁基橡胶提供理论指导。

Composites Part B: Engineering

Additive manufacturing and microstructure effects on thermal and mechanical properties of ply-hybrid carbon and glass fiber composites

Cristina Pascual-González, Jesús García-Moreno Caraballo, Iker Lizarralde, David Garoz Gómez, Juan P. Fernández-Blázquez

doi:10.1016/j.compositesb.2024.111446

增材制造及微观结构对复合材料热力学性能的影响

The fiber hybridization in high-strength composites is one of the most researched strategies to enhance their limited toughness. In this work, hybrid composites at laminate level by stacking together plies of carbon and glass fiber were prepared using fused filament fabrication (FFF) technique. The large void content and the poor adhesion between layers attributed to this technology are overcome by the addition of an optimized thermo-pressurized treatment. The analysis of post-processing temperature effects on the microstructural, thermal and interlaminar properties of additive manufactured hybrid composites, revealed a progressive porosity reduction preserving the dimensional accuracy. The enhancement of mechanical properties is due to different contributions that occurred during post-processing: (i) drying effect, which reduces the plasticization of the composites; (ii) improvement of interface adhesion due to the miscibility of polymers; and (iii) significant porosity reduction (below 1%). This work opens a wider space of possibilities, since FFF allows more complex designs than traditional composite manufacturing, and additionally provides an approach to promote molecular diffusion at the interface, which is the most critical region of FFF parts.

高强度复合材料中纤维杂化是提高其极限韧性的研究热点之一。本文采用熔融长丝制造技术(FFF)制备了碳纤维和玻璃纤维层状复合材料。由于该技术导致的空隙含量大和层间粘结力差的问题通过添加优化的热压处理得以克服。分析了后处理温度对复合材料显微组织、热学和层间性能的影响，结果表明，复合材料的孔隙率呈递进式降低趋势，同时保持了尺寸精度。机械性能的增强是由于后处理过程中发生的不同贡献:(1)干燥效应，它降低了复合材料的塑化;(ii)由于聚合物的混相性，界面附着力得到改善;(iii)孔隙率显著降低(低于1%)。这项工作开辟了更广阔的可能性空间，因为FFF允许比传统复合材料制造更复杂的设计，并且还提供了一种促进界面分子扩散的方法，这是FFF零件最关键的区域。

Alternative Inner Filling and Outer Surface Coating of BNNT by Tungsten(VI) Oxide for Supercapacitor Electrode

Honggu Kim, Chandan Kumar Maity, Sada Venkateswarlu, Myung Jong Kim

doi:10.1016/j.compositesb.2024.111436

超级电容器电极用氧化钨(VI)内填充和外涂BNNT的替代方法

The motivation behind this research is to address the need for advanced energy storage materials by exploring the selective filling and coating of boron nitride nanotube (BNNT) with tungsten(VI) oxide (WO3) to enhance the pseudocapacitive performance. In this study, we present a novel synthesis method that allows precise control over the extent of filling and coating, aiming to create tailored hybrid structures. Morphological and structural analysis confirm the filling and coating of BNNT by WO3. Inner filling and outer surface coating of BNNT by WO3 significantly impact on the electrochemical properties. The filling of WO3 within the BNNT can enhance the stability of the system, whereas outer surface coating of BNNT by WO3 improves the capacitive performances. The role of BNNT influences both these phenomena by acting as electrolyte transportation channel as well as stabilizing the WO3. In three electrode study, WO3 coated BNNT showed the maximum specific capacitance of 856 F/g at 1 A/g. An asymmetric supercapacitor device using WO3 coated BNNT as positive electrode revealed the maximum specific capacitance of 137 F/g at 2 A/g current density with an improved energy density of 52 W h/kg. The WO3 coated BNNT-based asymmetric supercapacitor device also showed ∼81% specific capacitance retention after the completion of 10000 GCD cycles, whereas WO3 filled BNNT-based supercapacitor device demonstrated better stability (∼94% specific capacitance retention) due to the filling and stabilization of pseudocapacitive WO3 by BNNT.

本研究的动机是通过探索氮化硼纳米管(BNNT)的选择性填充和氧化钨(WO3)涂层来提高其赝电容性能，以满足对先进储能材料的需求。在这项研究中，我们提出了一种新的合成方法，可以精确控制填充和涂层的程度，旨在创建定制的混合结构。形貌和结构分析证实了WO3对BNNT的填充和包覆。WO3内填充和外表面涂覆对BNNT的电化学性能有显著影响。在BNNT内部填充WO3可以提高体系的稳定性，而在BNNT外表面涂覆WO3则可以提高BNNT的电容性能。BNNT通过作为电解质运输通道和稳定WO3来影响这两种现象。在三电极研究中，WO3涂层的BNNT在1 A/g下的最大比电容为856 F/g。采用WO3包覆BNNT作为正极的非对称超级电容器器件在2 A/g电流密度下的最大比电容为137 F/g，能量密度提高到52 W h/kg。在完成10000次GCD循环后，WO3涂层的BNNT基非对称超级电容器器件也显示出~ 81%的比电容保留率，而WO3填充的BNNT基超级电容器器件由于BNNT填充和稳定了伪电容WO3，表现出更好的稳定性(~ 94%的比电容保留率)。

Composites Science and Technology

Constructing a special interface structure of starch/PBAT composites with a novel “many-to-many” strategy

Qiangxian Wu, Yunguo Liu, Kui Jian, Sike Jiang, Fangqing Weng, Chengyue Wu

doi:10.1016/j.compscitech.2024.110593

采用新型“多对多”策略构建淀粉/PBAT复合材料的特殊界面结构

It is a challenge to achieve a high reaction ratio of compatibilizers for improving the compatibility of the composites due to high melt viscosity and short residence time during melt processing. Inspired by the fact that xanthium seeds in nature are easy to combine with animal fur efficiently, a new "many-to-many" melting chemical reaction strategy was proposed to greatly improve the reaction ratio of compatibilizers. In this work, a polycaprolactone-based polyurethane prepolymer (PCLPU) was used to prepare compatible starch/poly(butyleneadipate-co-terephthalate) (PBAT) composites. Polyurethane nanoparticles containing a lot of -NCO groups were prepared and then reacted with tapioca starch with a lot of -OH groups in an intensive mixer to obtain starch/PBAT composite material with a special interface structure. Compared with the biocomposites without PCLPU, the PCLPU-modified biocomposites exhibited compatible morphology and excellent mechanical properties, and the reaction ratio of the PCLPU was as high as 99.2%. The special polyurethane prepolymer interface formed in the composite interacted with the hydrophilic starch granules through urethane linkages and with hydrophobic PBAT through physical PBAT-PBAT linkages. Therefore, the novel strategy used to achieve a special interface structure for improving the mechanical properties of a composite was a simple, efficient, and environmentally friendly method.

在熔体加工过程中，由于熔体粘度高、停留时间短，为提高复合材料的相容性，需要提高相容剂的反应比。利用自然界苍耳种子易于与动物皮毛有效结合的特点，提出了一种新的“多对多”熔融化学反应策略，大大提高了相容剂的反应比例。本文采用聚己内酯基聚氨酯预聚物(PCLPU)制备了相容性淀粉/聚己二酸丁酯-对苯二甲酸酯(PBAT)复合材料。制备了含有大量-NCO基团的聚氨酯纳米颗粒，并与含有大量-OH基团的木薯淀粉在强力混合器中反应，得到具有特殊界面结构的淀粉/PBAT复合材料。与未添加PCLPU的生物复合材料相比，PCLPU改性的生物复合材料具有良好的形态相容性和力学性能，PCLPU的反应率高达99.2%。复合材料中形成的特殊聚氨酯预聚物界面通过聚氨酯键与亲水性淀粉颗粒相互作用，通过物理PBAT-PBAT键与疏水性PBAT相互作用。因此，采用新的策略来实现特殊的界面结构以提高复合材料的力学性能是一种简单、高效和环保的方法。

来源：复合材料力学仿真Composites FEM

【新文速递】2024年4月1日固体力学SCI期刊最新文章

今日更新：International Journal of Solids and Structures 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 2 篇International Journal of Solids and StructuresA comprehensive investigation of the lattice structure mechanical properties based on schwarz primitive triply periodic minimal surface: Elastic modulus, yield strength, and maximum bearing force in the elastic regionAmin Dadashi, Gholamhossein Rahimidoi:10.1016/j.ijsolstr.2024.112776 基于施瓦茨基元三周期极小面的晶格结构力学特性综合研究：弹性区域的弹性模量、屈服强度和最大承载力Due to ongoing investigations, the potential for using triply periodic minimal surface (TPMS) lattice structures in various industries has been increased. The analytical relationships that determine the mechanical properties of these structures make cost-effective designs achievable for designers. In this study, a comprehensive investigation that includes analytical, numerical, and experimental approaches to determine the mechanical properties of the Primitive triply periodic minimal surface (P-TPMS) lattice structure under unidirectional loading was performed. The innovation of this paper is the derivation of analytical relationships of mechanical properties, including elastic modulus, yield strength, and maximum load-bearing force in the elastic region in terms of geometrical parameters of Primitive unit cell and properties of the constituent materials. These mechanical properties were obtained using the energy method and Euler-Bernoulli beam theory for relative densities in the range of 0.24–0.76. Relative density was determined based on the geometric parameter of the surface size (m). In addition, the lattice structures were fabricated additively manufactured, and compressive test experiments were conducted. The mechanical properties of P-TPMS lattice structures vary dramatically with varying surface size values, according to the study's findings. The P-TPMS lattice structure's elastic modulus and yield strength at m=0.35 are more than 11 and 32 times larger, respectively than the yield stress and elastic modulus at m=0.65. The unit cell's length has no bearing on the elastic modulus or yield strength.随着研究的不断深入，三重周期性最小表面（TPMS）晶格结构在各行各业的应用潜力不断增加。确定这些结构机械性能的分析关系使得设计人员可以进行经济有效的设计。本研究通过分析、数值和实验等方法对原始三周期极小面（P-TPMS）晶格结构在单向载荷下的力学性能进行了全面研究。本文的创新之处在于根据原始单元格的几何参数和组成材料的特性，推导出机械特性的分析关系，包括弹性模量、屈服强度和弹性区域的最大承载力。这些力学性能是在相对密度为 0.24-0.76 的范围内，利用能量法和欧拉-伯努利梁理论获得的。相对密度是根据表面尺寸（m）的几何参数确定的。此外，还采用添加法制造了晶格结构，并进行了抗压测试实验。研究结果表明，随着表面尺寸值的变化，P-TPMS 晶格结构的机械性能也会发生显著变化。m=0.35 时，P-TPMS 晶格结构的弹性模量和屈服强度分别比 m=0.65 时的屈服应力和弹性模量大 11 倍和 32 倍以上。单元格的长度对弹性模量和屈服强度没有影响。International Journal of PlasticityExceptional ductility through interface-constrained grain growth for the ultrafine-scale Ni/Ni-W layered compositesFei Liang, Zhe-Xuan Wang, Mei-Yue Li, Bin Zhang, Xue-Mei Luo, Xiao-Fei Zhu, Guang-Ping Zhangdoi:10.1016/j.ijplas.2024.103959 通过界面约束晶粒生长实现超细镍/镍-钨层状复合材料的优异延展性Enhancing the strength of metallic laminates through decreasing the constituent layer thickness from micrometer to nanometer scale is usually accompanied by the degradation of ductility because plastic instability characterized by fatal shear bands inevitably occurs in the early stage of deformation. To overcome the strength-ductility trade-off dilemma, we designed a kind of metallic layered composites (LCs) consisting of nano-grained Ni (grain size: 21-37 nm) and ultrafine nano-grained Ni-W (grain size: 8 nm) constituent layers with layer thickness ranging from microns to tens of nanometers. We found that the strength and ductility of Ni/Ni-W LCs can be simultaneously enhanced by decreasing the layer thickness. Interface-constrained grain growth in the Ni layers with an initial layer thickness of less than 1 μm enhances strain hardening ability. Thus, strain delocalization characterized by the formation of rectangular strain zones instead of crossed micro shear bands appears in the LCs. Based on the above mechanism, we obtained the optimum ratio of the layer thickness to the grain size for the nano-grained Ni layers as about 15:1, which corresponds to Ni0.25/Ni-W0.025 LCs with the highest tensile strength (1.9 GPa) and elongation to failure (5.5%). These findings may provide a new path for the design principle of metallic LCs with multi-level microstructural and geometrical scales.通过将组成层的厚度从微米级减小到纳米级来提高金属层压材料的强度，通常会伴随着延展性的降低，因为在变形早期不可避免地会出现以致命剪切带为特征的塑性不稳定性。为了克服强度-延展性权衡的难题，我们设计了一种由纳米级镍（晶粒尺寸：21-37 纳米）和超细纳米级镍-钨（晶粒尺寸：8 纳米）组成的金属层状复合材料（LCs），层厚从微米到数十纳米不等。我们发现，通过减小层厚度，Ni/Ni-W LCs 的强度和延展性可同时得到提高。初始层厚小于 1 μm 的镍层中的界面约束晶粒生长可增强应变硬化能力。因此，低密度层中出现了以形成矩形应变区而不是交叉微剪切带为特征的应变分散。根据上述机理，我们得到了纳米晶粒镍层的最佳层厚与晶粒大小比约为 15:1，对应于具有最高拉伸强度（1.9 GPa）和破坏伸长率（5.5%）的 Ni0.25/Ni-W0.025 LCs。这些发现可能会为具有多级微结构和几何尺度的金属 LCs 的设计原理提供一条新的途径。Thin-Walled StructuresWELDED BEAM-TO-COLUMN STEEL JOINTS: ASSESSMENT OF EUROPEAN DESIGN RULESJorge Conde, Fernando Freire, Filip Ljubinković, Martin Vild, Luís Simões da Silvadoi:10.1016/j.tws.2024.111844梁与柱的焊接钢接头：欧洲设计规则评估Properly validated high-quality Finite Element (FE) models with experimental tests permit an accurate description of the load-deformation path and stress state of steel joints and are nowadays accepted as “experimental results”. Changes to the design of welded joints in Eurocode 3 are currently proposed that affect the resistance and stiffness of the components associated with the column web panel. This paper presents an assessment of the design formulations included in the current Eurocode 3, part 1-8, and its forthcoming update in terms of stiffness and moment resistance, compared against a large parametric study of strong-axis beam-column welded joints for open sections carried out using validated sophisticated FE models. The results show that both the old and new Eurocode formulations provide a large scatter and no big differences between both methods. Additionally, the presence of axial force in the column shows a clear increase in the ratio between design resistance vs numerical resistance that, particularly in the case of transversally stiffened joints, may be unconservative.经过适当验证的高质量有限元 (FE) 模型与实验测试可以准确描述钢接头的载荷变形路径和应力状态，如今已被公认为 "实验结果"。目前，欧洲规范 3 对焊接接头的设计提出了修改建议，这将影响与柱腹板相关部件的阻力和刚度。本文介绍了对现行 Eurocode 3 第 1-8 部分及其即将更新的刚度和抗弯矩设计方案的评估，并与使用经过验证的复杂 FE 模型对开放截面的强轴梁-柱焊接接头进行的大型参数研究进行了比较。研究结果表明，新旧欧洲规范的计算方法存在较大差异，两种方法之间没有明显区别。此外，柱中轴向力的存在明显增加了设计阻力与数值阻力之间的比率，特别是在横向加固接头的情况下，这可能是不可靠的。Experimental and numerical investigation of through-diaphragm in H-shaped steel beam to CFST column connectionsYongHyun Cho, Fangying Wang, SooYeon Seo, KangSeok Lee, TaeSoo Kimdoi:10.1016/j.tws.2024.111852H 型钢梁与 CFST 柱连接中贯穿隔膜的实验和数值研究This research proposes a cruciform through-diaphragm (CTD) for an H-shaped steel beam to concrete-filled steel tubular (CFST) column and investigates its seismic performance experimentally and numerically. The proposed connection consists of through-plates passing through the aligned slots in the panel zone and end plates directly welded to an H-shaped steel beam. This connection eliminates welding inside the steel tube for installation of the diaphragm, while providing a reliable load path from the steel beam to the CFST column. The experimental program examined the connection hysteretic behaviors, including the moment-rotation response, ductility, initial stiffness, and energy dissipation capacity. The proposed connection shows stable hysteric behavior and good energy dissipation up to a story drift up to 4% and satisfies the AISC seismic provisions criteria for special moment connection. A finite element (FE) model was established and verified against the experimental results. The effects of concrete infill, steel tube column thickness, axial load ratio, and through-plate thickness on the hysteretic behavior of the proposed connection were investigated through parametric analysis of 24 FE models. This study provides the information on the optimized design parameters that ensures the stable seismic performance of the proposed connection that could be used in structural engineering practice.本研究提出了一种用于 H 型钢梁与混凝土填充钢管（CFST）柱的十字形贯穿隔膜（CTD），并对其抗震性能进行了实验和数值研究。拟议的连接由穿过面板区对齐槽的通板和直接焊接到 H 型钢梁上的端板组成。这种连接方式省去了在钢管内焊接安装隔膜的工序，同时提供了从钢梁到 CFST 柱的可靠载荷路径。实验程序检查了连接的滞后行为，包括力矩旋转响应、延展性、初始刚度和耗能能力。拟议的连接显示出稳定的滞回行为和良好的消能能力，可承受高达 4% 的楼层漂移，并满足 AISC 抗震规定中关于特殊弯矩连接的标准。建立了一个有限元（FE）模型，并根据实验结果进行了验证。通过对 24 个有限元模型进行参数分析，研究了混凝土填充、钢管柱厚度、轴向荷载比和通板厚度对拟议连接滞回行为的影响。这项研究提供了优化设计参数的信息，以确保所提连接具有稳定的抗震性能，可用于结构工程实践。来源：复合材料力学仿真Composites FEM