【新文速递】2024年6月15日复合材料SCI期刊最新文章

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今日更新：Composite Structures 3 篇，Composites Part A: Applied Science and Manufacturing 1 篇，Composites Part B: Engineering 1 篇，Composites Science and Technology 1 篇

Composite Structures

Photo-responsive platelet vesicles-iron oxide nanoparticles-bioglass composite for orthopedic bioengineering

Andrew E.-Y. Chuang, Pei-Wei Weng, Chia-Hung Liu, Pei-Ru Jheng, Lekshmi Rethi, Hieu Trung Nguyen, Hsien-Tsung Lu

doi:10.1016/j.compstruct.2024.118263

用于骨科生物工程的光响应血小板囊泡-氧化铁纳米颗粒-生物玻璃复合材料

In our study, we present an innovative approach to precisely modulate cellular activity and facilitate bone regeneration through non-invasive, remote stimuli application. Our methodology involves the creation of a composite material, namely platelet vesicles, iron oxide nanoparticles, and 45 s5 Bioglass (PLTV-IO NPs/BG), designed to establish a photoelectric and photothermal (PET/PTT) environment around an implant. Under near-infrared (NIR) light, the PLTV-IO NPs/BG composite demonstrates mild-hyperthermic and photoelectric responsive effects. Notably, this application enhances the mechanical strength of the hydrogel F127 and encourages sequential cell management. These observed effects collectively indicate the material’s potential in tissue engineering, specifically for bone regeneration. Our research introduces a biological therapeutic strategy that achieves remote and non-invasive regulation of cellular progression behaviors within phototherapeutic microenvironments, effectively harnessing the power of NIR light. This multidimensional approach holds promise for advancing the field of biomedical research and therapeutic applications.

在我们的研究中，我们提出了一种创新方法，通过非侵入性的远程刺激应用，精确调节细胞活性并促进骨再生。我们的方法包括创建一种复合材料，即血小板囊泡、氧化铁纳米颗粒和 45 s5 生物玻璃（PLTV-IO NPs/BG），用于在植入物周围建立光电和光热（PET/PTT）环境。在近红外（NIR）光下，PLTV-IO NPs/BG 复合材料显示出温和的超热和光电响应效应。值得注意的是，这种应用增强了水凝胶 F127 的机械强度，并促进了细胞的连续管理。这些观察到的效应共同表明了这种材料在组织工程，特别是骨再生方面的潜力。我们的研究引入了一种生物治疗策略，可在光疗微环境中实现对细胞进展行为的远程非侵入性调节，有效利用了近红外光的力量。这种多维方法有望推动生物医学研究和治疗应用领域的发展。

Enabling multi-stage high-temperature strength evolution prediction of ceramizable composites using a novel multi-field coupled model

Zheng Gong, Huanfang Wang, Chao Zhang

doi:10.1016/j.compstruct.2024.118279

利用新型多场耦合模型实现可陶瓷化复合材料的多阶段高温强度演化预测

Strength varies significantly under high-temperature environment, due to the inherent thermomechanical behavior of the ceramizable material and its coupling with possible chemical reactions. The complexity amplifies for composite materials, considering their multi-phase and multi-scale features, and more importantly, their complicated chemical reactions under high-temperature service conditions. This study proposes an innovative multi-field coupling theory framework for predicting the multi-stage evolution behavior of high-temperature mechanical properties of a ceramizable composite, through incorporating an extended chemical kinetics method, coupled deformation, mass diffusion and heat conduction. The developed model enables direct coupling and simultaneous solving of physical, chemical and thermal variables. It captures well the degradation of mechanical properties for the initial stage and the increase of strength for the later stage, along with the increasing of temperature. The validated model also enables well prediction of time-dependent mechanical properties at high service temperature, with an average error of 8.67% against experimental measured results. The developed method can serve as a general method for the prediction of high-temperature mechanical property of thermal protection composites and structures.

由于可陶瓷材料固有的热机械行为及其与可能发生的化学反应的耦合，高温环境下的强度变化很大。考虑到复合材料的多相和多尺度特征，更重要的是考虑到其在高温服役条件下的复杂化学反应，复合材料的复杂性会进一步增加。本研究提出了一种创新的多场耦合理论框架，通过结合扩展的化学动力学方法、耦合变形、质量扩散和热传导，预测可陶瓷化复合材料高温力学性能的多阶段演化行为。所开发的模型可直接耦合并同时求解物理、化学和热变量。它能很好地捕捉到随着温度的升高，初期阶段机械性能的下降和后期阶段强度的提高。经过验证的模型还能很好地预测高使用温度下随时间变化的机械性能，与实验测量结果的平均误差为 8.67%。所开发的方法可作为热防护复合材料和结构高温力学性能预测的通用方法。

Evaluation of fatigue damage of woven GFRP laminate by dynamic properties

Ruixi Xu, Akihiko Sato, Yasuo Kitane, Kunitomo Sugiura

doi:10.1016/j.compstruct.2024.118280

通过动态特性评估 GFRP 编织层压板的疲劳损伤

As Glass Fiber Reinforced Polymers (GFRP) have increasingly been used in civil infrastructures construction, their mechanical properties have received more and more attention. Although its performance under static loading has been studied widely, experimental and analytical research on its dynamic response is still insufficient. In particular, the relationship between fatigue damage occurring in woven cloth GFRP and its dynamic properties has not been quantitatively evaluated. Therefore, by carrying out impact and fatigue loading tests, investigated in this study is the variation of dynamic properties on GFRP orthogonal laminate with fatigue damage. The experiments revealed that the damping ratio of GFRP laminates with both 0/90 degrees fibers and ± 45 degrees fibers showed an increasing trend with the number of loading cycles, while the natural frequency showed a decreasing trend. Based on this trend, this study proposed a method to monitor fatigue damage progression of the material through the variation of natural frequencies. The decreasing trend of natural frequency could be simulated well by the theoretical model proposed in this study. Furthermore, based on previous studies and the experimental results of this study, a new frequency-based damage index to monitor GFRP’s fatigue life was proposed.

随着玻璃纤维增强聚合物（GFRP）越来越多地应用于民用基础设施建设，其机械性能也受到越来越多的关注。尽管对其在静态负载下的性能进行了广泛的研究，但对其动态响应的实验和分析研究仍然不足。特别是对编织布 GFRP 发生的疲劳损伤与其动态性能之间的关系还没有进行定量评估。因此，本研究通过冲击和疲劳加载试验，研究了疲劳损伤对 GFRP 正交层压板动态特性的影响。实验结果表明，具有 0/90 度纤维和 ±45 度纤维的 GFRP 层压板的阻尼比随加载循环次数的增加呈上升趋势，而固有频率则呈下降趋势。基于这一趋势，本研究提出了一种通过固有频率的变化来监测材料疲劳损伤进展的方法。本研究提出的理论模型可以很好地模拟固有频率的下降趋势。此外，根据以往的研究和本研究的实验结果，提出了一种新的基于频率的损伤指数来监测 GFRP 的疲劳寿命。

Composites Part A: Applied Science and Manufacturing

A novel approach to design structural natural fiber composites from sustainable CO 2 -derived polyhydroxyurethane thermosets with outstanding properties and circular features

Guillem Seychal, Pierre Nickmilder, Vincent Lemaur, Connie Ocando, Bruno Grignard, Philippe Leclère, Christophe Detrembleur, Roberto Lazzaroni, Haritz Sardon, Nora Aranburu, Jean-Marie Raquez

doi:10.1016/j.compositesa.2024.108311

利用可持续的二氧化碳衍生聚羟基聚氨酯热固性材料设计具有出色性能和循环特性的天然纤维结构复合材料的新方法

We herein propose capitalizing on strong hydrogen bonding from novel bio-CO 2 -derived dynamic thermosets to achieve high-performance natural fiber composites (NFC) with circular features. CO 2 - and biomass-derived polyhydroxyurethane (PHU) thermosets were selected, for the first time of our knowledge, as matrices for their ability to make strong H-bond, resulting in outstanding mechanical properties for NFC. Exploiting this H-bond key feature, exceptional interface bonding between flax and PHU was confirmed by atomic force microscopy and rationalized by atomistic simulation. Without any treatment, an increase of 30% of stiffness and strength was unveiled compared to an epoxy benchmark, reaching 35 GPa and 440 MPa respectively. Related to the thermoreversible nature of hydroxyurethane moieties, cured flax-PHU were successfully self-welded and displayed promising properties, together with recyclability features. This opens advanced opportunities that cannot be reached with epoxy-based composites. Implementing CO 2 -derived thermosets in NFC could lead to more circular materials, critical for achieving sustainability goals.

在此，我们提议利用新型生物-CO 2-衍生动态热固性材料的强氢键来实现具有圆形特征的高性能天然纤维复合材料（NFC）。据我们所知，二氧化碳和生物质衍生的聚羟基氨基甲酸酯（PHU）热固性塑料首次被选为基材，因为它们能够产生强大的氢键，从而为 NFC 带来出色的机械性能。利用这种 H 键的关键特性，亚麻和 PHU 之间特殊的界面键合得到了原子力显微镜的证实，并通过原子模拟得到了合理的解释。与环氧基准相比，在不做任何处理的情况下，刚度和强度提高了 30%，分别达到 35 GPa 和 440 MPa。由于羟基聚氨酯分子具有热可逆性，固化后的亚麻-PHU 可成功实现自焊接，并显示出良好的性能和可回收性。这开创了环氧基复合材料无法达到的先进技术。在 NFC 中使用二氧化碳衍生热固性材料可以生产出更多的循环材料，这对实现可持续发展目标至关重要。

Composites Part B: Engineering

Effect of temperature on binding process of calcium carbonate concrete through aragonite crystals precipitation

Ngoc Kien Bui, Ryo Kurihara, Manabu Kanematsu, Hikotsugu Hyodo, Takafumi Noguchi, Ippei Maruyama

doi:10.1016/j.compositesb.2024.111625

温度对文石晶体析出碳酸钙混凝土结合过程的影响

This study investigated the impact of temperature on the strength development of calcium carbonate concrete (CCC) comprising calcium carbonate and concrete waste. CCC exhibited its highest compressive strength when manufactured at temperatures between 60–70 °C, thereby demonstrating strengths 1.5 and 2.7 times greater than those achieved at 40 and 90 °C, respectively. At this temperature range (60–70 °C), CCC showed the highest amount of precipitated aragonite with large acicular aragonite crystals, which decreased the porosity of CCC. This temperature range governed the homogeneous distribution of calcium carbonate deposition within the CCC specimen. Moreover, the carbonated cement paste particles within the CCC continuously underwent aqueous carbonation, thereby providing an additional Ca source for calcium carbonate precipitation in CCC. At high temperatures, this process promotes the precipitation of Ca ions as needle-like aragonite crystals during reprecipitation, thereby accelerating the transformation of calcium carbonate polymorphs. The CCC strength arose from the deposition of calcium carbonate from input calcium bicarbonate solution and the reprecipitation of calcium carbonate during aqueous carbonation. The calcium carbonate precipitation from aqueous carbonation accounts for 30% of the total calcium carbonate precipitation of CCC. Needle-like aragonite crystals functioned as interlocking bridges between the particles and frame connections, thereby effectively strengthening the CCC composite.

本研究探讨了温度对由碳酸钙和混凝土废料组成的碳酸钙混凝土（CCC）强度发展的影响。碳酸钙混凝土在 60-70 °C之间的温度下生产时抗压强度最高，分别是在 40 °C和90 °C温度下强度的 1.5 倍和 2.7 倍。在这一温度范围（60-70 °C）内，CCC 中析出的文石数量最多，且析出了大量针状文石晶体，从而降低了 CCC 的孔隙率。这一温度范围决定了碳酸钙沉积在 CCC 试样中的均匀分布。此外，CCC 中的碳化水泥浆颗粒不断发生水碳化，从而为 CCC 中碳酸钙的沉淀提供了额外的钙源。在高温条件下，这一过程会促进 Ca 离子在再沉淀过程中析出针状文石晶体，从而加速碳酸钙多晶体的转变。CCC 的强度来自碳酸氢钙输入溶液中碳酸钙的沉淀和水碳化过程中碳酸钙的再沉淀。水碳酸化过程中析出的碳酸钙占 CCC 碳酸钙析出总量的 30%。针状文石晶体在颗粒和框架连接之间起到了连锁桥梁的作用，从而有效地强化了 CCC 复合材料。

Composites Science and Technology

GPC filler with dual functions of physical barrier and corrosion inhibition for corrosion protection enhancement of electrophoretic deposited epoxy coating

Rui Gou, Shihong Zhang, Yi He, Changhua Li, Dan Sun, Yiling He, Hongjie Li, Khavkin Aleksandr, Xiao Guo, Hua Xiang

doi:10.1016/j.compscitech.2024.110711

具有物理屏障和缓蚀双重功能的 GPC 填料，用于增强电泳沉积环氧涂层的防腐性能

In this work, the synergistic effect of polyaniline (PANI) and Ce cations was utilized to develop a graphene oxide (GO) electrophoretic deposition (EPD) green epoxy (EP) coating with a physical barrier and corrosion inhibition. PANI and Ce cation not only form a protective layer with inhibition but also convert the negative charge of GO to a positive charge, thus satisfying the conditions of cathodic electrophoretic deposition (C-EPD). Anti-corrosion test results showed that the GO/PANI/Ce(NO3)3 (GPC) /EP composite coating has the highest impedance, with the impedance modulus at day 35 three orders of magnitude higher than that of the neat EP coating. The passivation film generated by the GPC inhibits large corrosion extensions; it produces a significant self-healing effect, as evidenced by the corrosion morphology, the XPS analysis, and the stable value of the impedance modulus. This work provides a new strategy for manufacturing high-performance electrophoretic epoxy coatings with self-healing properties.

本研究利用聚苯胺（PANI）和Ce阳离子的协同效应，开发了一种具有物理屏障和缓蚀作用的氧化石墨烯（GO）电泳沉积（EPD）绿色环氧树脂（EP）涂层。PANI 和 Ce 阳离子不仅能形成具有抑制作用的保护层，还能将 GO 的负电荷转化为正电荷，从而满足阴极电泳沉积（C-EPD）的条件。防腐蚀测试结果表明，GO/PANI/Ce(NO3)3 (GPC) /EP 复合涂层的阻抗最高，第 35 天时的阻抗模量比纯 EP 涂层高三个数量级。由 GPC 生成的钝化膜可抑制大的腐蚀扩展；从腐蚀形态、XPS 分析和稳定的阻抗模量值可以看出，它产生了显著的自修复效果。这项工作为制造具有自修复特性的高性能电泳环氧涂层提供了一种新策略。

来源：复合材料力学仿真Composites FEM

【新文速递】2024年6月17日复合材料SCI期刊最新文章

今日更新：Composite Structures 1 篇，Composites Part A: Applied Science and Manufacturing 1 篇，Composites Part B: Engineering 1 篇，Composites Science and Technology 1 篇Composite StructuresNovel interaction effects enhance specific energy absorption in foam-filled CFRP tapered tubesXinmei Xiang, Chenkun Xiao, Guoxing Lu, Yi Min Xie, Haiyang Yang, Jing Zhang, Ngoc San Hadoi:10.1016/j.compstruct.2024.118288新颖的相互作用效应增强了泡沫填充 CFRP 锥形管的比能量吸收能力This study unveils a novel interaction effect in the foam-filled CFRP tapered tubes that enhances their specific energy absorption (SEA), challenging the conventional understanding that foam fillers decrease the SEA of structures like foam-filled CFRP straight tubes and foam-filled metal tapered tubes. Quasi-static axial compression tests were conducted on foam-filled CFRP tubes with varying taper angles (0°, 5°, 10°, 15°) to confirm and quantify this newfound interaction effect. The energy absorption characteristics and interaction effect due to the foam filler in the foam-filled CFRP tapered tubes were thoroughly evaluated and compared to 3D-printed 316L stainless steel tubes and unfilled CFRP counterparts. Contrary to expectations, our results indicate that the foam-filled CFRP tubes consistently outperform both steel and unfilled CFRP tubes in energy absorption. Intriguingly, the CFRP foam-filled tapered tubes in this study demonstrated higher SEA compared to CFRP tubes without foam filler, underscoring the remarkable effectiveness of CFRP materials in foam-filled tapered tube applications. Our comprehensive interaction effect analysis highlights the substantial contribution of the unique synergy between the foam filler and the debris of the CFRP tapered tube to this increased SEA. Additionally, we propose a novel hybrid design that integrates straight and tapered CFRP tubes with foam fillers, leveraging the newfound interaction effect to further enhance the energy absorption of tapered tubes. This research not only emphasizes the advantages of foam fillers in enhancing CFRP tapered structures but also introduces innovative possibilities for energy absorption applications across various industries.本研究揭示了泡沫填充 CFRP 锥形管中的新型相互作用效应，这种效应可增强其比能量吸收（SEA），从而挑战了泡沫填充物会降低泡沫填充 CFRP 直管和泡沫填充金属锥形管等结构的 SEA 的传统认识。我们对不同锥角（0°、5°、10°、15°）的泡沫填充 CFRP 管进行了准静态轴向压缩试验，以确认和量化这种新发现的相互作用效应。对泡沫填充的 CFRP 锥形管的能量吸收特性和泡沫填充物的相互作用效应进行了全面评估，并与 3D 打印的 316L 不锈钢管和未填充的 CFRP 管进行了比较。与预期相反，我们的结果表明，填充泡沫的 CFRP 管在能量吸收方面始终优于钢管和未填充的 CFRP 管。耐人寻味的是，与未填充泡沫的 CFRP 管相比，本研究中填充泡沫的 CFRP 锥形管具有更高的 SEA 值，这表明 CFRP 材料在填充泡沫的锥形管应用中效果显著。我们进行了全面的相互作用效应分析，结果表明，泡沫填充物与 CFRP 锥形管碎片之间的独特协同作用对 SEA 的提高做出了重大贡献。此外，我们还提出了一种新型混合设计，将带有泡沫填料的直管和锥形 CFRP 管整合在一起，利用新发现的相互作用效应进一步提高锥形管的能量吸收能力。这项研究不仅强调了泡沫填料在增强 CFRP 锥形结构方面的优势，还为各行各业的能量吸收应用带来了创新的可能性。Composites Part A: Applied Science and ManufacturingAdvances in bulk TiB2-based composites: Densification and tougheningZhennan Cao, Jialin Sun, Keguo Zhang, Wenbin Ji, Kunlong Cai, Bin Li, Bo Liu, Chengqiang Fandoi:10.1016/j.compositesa.2024.108318块状 TiB2 基复合材料的进展：致密化和增韧TiB2 based materials have attracted extensive attention due to its considerable hardness and elastic modulus, excellent wear/ corrosion resistance as well as exceptional electrical/ thermal conductivity. The potential structural and functional applications of TiB2 based materials include reentry vehicles, cutting tools, thermal insulation boards, new energy batteries, ballistic protection high temperature nuclear reactors. However, the poor densification together with inferior fracture toughness dramatically limited the practical application of TiB2. Herein, we critically survey, summarize, and discuss the recent advances on preparation and mechanical properties of TiB2-based materials, focusing on the current understanding of densification and toughening strategies and mechanisms. Borrowing the concept of cemented carbide, cemented TiB2 is proposed in this review, highlighting the different binder phase on improving the densification of TiB2, including metal, intermetallic, ceramic and high entropy alloy. Subsequently, through discussing the factors influencing the efficiency of toughening TiB2, we determine and compare various toughening approaches on TiB2. Furthermore, the challenges and prospects of high performance TiB2 for future scientific researches and practical possibilities are also briefly summarized. We believe a thorough summary of the densification and toughening mechanisms will significantly contribute to the development of dense, strong and tough TiB2 materials in a much more efficient way, advancing them for further wide applications.由于 TiB2 具有相当高的硬度和弹性模量、出色的耐磨性/耐腐蚀性以及优异的导电性/导热性，它已引起了广泛的关注。基于 TiB2 的材料在结构和功能方面的潜在应用包括重返大气层飞行器、切削工具、隔热板、新能源电池、防弹高温核反应堆。然而，较差的致密性和较差的断裂韧性极大地限制了 TiB2 的实际应用。在此，我们对基于 TiB2 的材料的制备和机械性能的最新进展进行了批判性的调查、总结和讨论，重点是目前对致密化和增韧策略及机制的理解。借用硬质合金的概念，本综述提出了硬质合金 TiB2，强调了不同粘结相对改善 TiB2 变质的作用，包括金属、金属间、陶瓷和高熵合金。随后，通过讨论影响 TiB2 增韧效率的因素，我们确定并比较了 TiB2 的各种增韧方法。此外，我们还简要总结了高性能 TiB2 在未来科学研究和实用可能性方面所面临的挑战和前景。我们相信，对致密化和增韧机理的全面总结将极大地促进以更高效的方式开发致密、高强度和高韧性的 TiB2 材料，推动其进一步广泛应用。Composites Part B: EngineeringRational structure design of metal-based cathode for high-rate and long-cycling sodium nickel chloride batteriesGuowei Xiong, Xiangwei Wu, Zhaoyin Wendoi:10.1016/j.compositesb.2024.111636用于高倍率和长循环氯化钠镍电池的金属基正极的合理结构设计High-temperature sodium-nickel chloride (Na-NiCl2) batteries represented as an advanced energy storage technology show impressive advantages including abundant raw materials, high safety and long-cycling life. Nevertheless, their large-scale application is still hindered by the poor stability and rate capability of the cathode. In this work, we designed a three-dimensional cross-linked network composed of NiFe alloy nanowires via a magnetic-field assisted method. The as-prepared NiFe nanowires (NiFe NWs) are mixed with NaCl as the composite cathode of sodium-metal chloride batteries, delivering exceptionally enhanced rate performance (150.3 mAh/g@0.88 C) and superior cycling stability (84.3% capacity retention after 500 cycles). The properties are superior to those of the cathode based on the pristine Ni nanowires or the NiFe nanoparticles, which is ascribe to the existence of active Fe metal and the continuous conductive network, as confirmed by kinetics analysis. After experiencing a long-term cycling at large current density (∼0.88 C), no obvious coarsening of NiFe NWs and NaCl particles occurs. Moreover, the large-size Na-NiCl2 battery with capacity of 229 mAh reaches a practical energy density of 265.65 Wh kg−1 (∼0.3 C) with energy efficiency of 88.6%. Therefore, our work provides a guide for rational design of cathode structure, thereby improving rate and cycling performance of Na-NiCl2 batteries.高温氯化钠镍（Na-NiCl2）电池作为一种先进的储能技术，具有原料丰富、安全性高、循环寿命长等显著优势。然而，其大规模应用仍然受到阴极稳定性和速率能力差的阻碍。在这项研究中，我们通过磁场辅助方法设计了一种由镍铁合金纳米线组成的三维交联网络。制备的镍铁合金纳米线（NiFe NWs）与氯化钠（NaCl）混合后用作氯化钠金属电池的复合阴极，可显著提高速率性能（150.3 mAh/g@0.88 C）和循环稳定性（500 次循环后容量保持率为 84.3%）。其性能优于基于原始镍纳米线或镍铁纳米颗粒的阴极，这归功于活性铁金属的存在和连续的导电网络，这一点已通过动力学分析得到证实。在大电流密度（∼0.88 C）下长期循环后，镍铁纳米线和氯化钠颗粒没有发生明显的粗化现象。此外，容量为 229 mAh 的大尺寸 Na-NiCl2 电池的实用能量密度达到 265.65 Wh kg-1 （∼0.3 C），能量效率为 88.6%。因此，我们的工作为合理设计正极结构提供了指导，从而提高了 Na-NiCl2 电池的速率和循环性能。Composites Science and TechnologyExperimental and numerical evaluation of the influence of voids on sound absorption behaviors of 3D printed continuous flax fiber reinforced PLA compositesZhixiong Bi, Qian Li, Zhen Zhang, Zhongsen Zhang, Weidong Yang, Yan Lidoi:10.1016/j.compscitech.2024.110720 空隙对 3D 打印连续亚麻纤维增强聚乳酸复合材料吸声行为影响的实验和数值评估This study aims to quantitatively analyze the effects of voids on sound absorption properties of 3D printed continuous flax fiber reinforced PLA composites (CFFRCs). Three kinds of flax yarns with different linear density were employed to prepare CFFRCs via 3D printing technology. The sound absorption performances of these composites were measured using the impedance tube based on the two-microphone transfer function method. The microstructure morphologies including cross-sections of flax yarns, voids shape and distributions of the composites were observed via ultra-depth microscope and micro-computed tomography to reconstruct the exact structures in simulation. Mercury intrusion porosimetry was applied to measure the voids dimensions of CFFRCs. The influence of voids on sound absorption mechanisms of CFFRCs were revealed based on thermoviscous acoustics theory by conducting the simulation in COMSOL software. The experimental results demonstrated that CFFRCs exhibited excellent sound absorption coefficients (close to 1) within the frequency range of 150 to 350 Hz and 350 to 550 Hz, resulting from the voids inside and between the flax yarns respectively. With the increase of linear density (diameter of the yarn), the contents of voids inside and between the flax yarns both increased. The dimensions of voids inside the flax yarns improved while those between flax yarns remained unchanged. The existence of the voids between the flax yarns resulted in a decrease in the sound absorption coefficient of CFFRCs, while more voids inside flax yarns led to the increase of the sound absorption frequency. Numerical results indicated that voids between the flax yarns contributed to a more uniform change in sound speed, reducing sound absorption performance. Whereas, voids inside the flax yarns could improve viscous friction of soundwaves due to narrow structures, enhancing sound absorption capabilities. This study is anticipated to provide a guidance for the design of integration of structure and function of 3D printed CFFRCs.本研究旨在定量分析空隙对三维打印连续亚麻纤维增强聚乳酸复合材料（CFFRC）吸声性能的影响。研究采用三种不同线密度的亚麻纱线，通过三维打印技术制备 CFFRC。利用基于双传声器传递函数法的阻抗管测量了这些复合材料的吸声性能。通过超深显微镜和微型计算机断层扫描观察了复合材料的微观结构形态，包括亚麻纱的横截面、空隙形状和分布，从而在模拟中重建了确切的结构。汞侵入孔隙模拟法用于测量 CFFRC 的空隙尺寸。通过在 COMSOL 软件中进行模拟，基于热粘声学理论揭示了空隙对 CFFRC 吸声机制的影响。实验结果表明，CFFRC 在 150 至 350 Hz 和 350 至 550 Hz 频率范围内表现出优异的吸声系数（接近 1），这分别是由于亚麻纱内部和亚麻纱之间的空隙造成的。随着线性密度（纱线直径）的增加，亚麻纱线内部和纱线之间的空隙含量都有所增加。亚麻纱内部空隙的尺寸有所改善，而亚麻纱之间空隙的尺寸保持不变。亚麻纱之间空隙的存在导致 CFFRC 的吸声系数降低，而亚麻纱内部空隙的增加则导致吸声频率增加。数值结果表明，亚麻纱之间的空隙会使声速变化更加均匀，从而降低吸音性能。而亚麻纱线内部的空隙由于结构狭窄，可以改善声波的粘性摩擦，从而提高吸音能力。这项研究有望为三维打印 CFFRC 的结构与功能一体化设计提供指导。来源：复合材料力学仿真Composites FEM