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【新文速递】2023年9月22日复合材料SCI期刊最新文章

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Composite Structures

Concurrent optimization method of principal stress orientation interpolated continuous fiber angle (PSO-CFAO) and structural topology

Ye Hongling, Dong Yongjia, Yang Jiaxi, Wang Weiwei, Cheng Ming

doi:10.1016/j.compstruct.2023.117572

主应力取向插值连续纤维角 (PSO-CFAO) 与结构拓扑的并行优化方法

Continuous fiber-reinforced polymers (CFRPs) have been widely applied in aerospace and other fields due to their excellent mechanical properties, which highly depends on the material distribution and fiber orientations. The designability of CFRP structures and fiber distributions provides an opportunity for achieving better physical properties through optimization. However, local optima and the dependence of initial fiber angle variables make the concurrent optimization of fiber orientation and topology a challenging problem. In this paper, the principal stress orientation interpolated continuous fiber angle optimization (PSO-CFAO) method combined with the independent continuous mapping (ICM) method is proposed to realize the design of CFRP structures with a clear macroscopic topology and microscopic fiber distribution. A sigmoid function is applied to interpolate the fiber angle variables by the principal stress orientation. The fiber angle variables are modified and a continuous fiber design is obtained during the iteration process, which reduces the possibility of a local optimum. Several examples are provided to prove the effectiveness and stability of the proposed method, and the expected results are acquired for different initial fiber angles, material parameters and mesh densities. The proposed method provides guidance for the design of CFRP structures and the planning of fiber laying paths.

连续纤维增强聚合物(CFRP)因其优异的机械性能而被广泛应用于航空航天和其他领域,而机械性能在很大程度上取决于材料分布和纤维取向。CFRP 结构和纤维分布的可设计性为通过优化获得更好的物理特性提供了机会。然而,局部最优化和初始纤维角度变量的依赖性使得同时优化纤维取向和拓扑结构成为一个具有挑战性的问题。本文提出了结合独立连续映射(ICM)方法的主应力取向插值连续纤维角度优化(PSO-CFAO)方法,以实现具有清晰宏观拓扑和微观纤维分布的 CFRP 结构设计。通过主应力取向应用 sigmoid 函数对纤维角度变量进行插值。在迭代过程中修改纤维角度变量并获得连续纤维设计,从而减少局部最优的可能性。我们提供了几个实例来证明所提方法的有效性和稳定性,并在不同的初始纤维角度、材料参数和网格密度下获得了预期结果。所提出的方法为 CFRP 结构的设计和纤维铺设路径的规划提供了指导。


Composites Part A: Applied Science and Manufacturing

A novel Multisource Energy Harvester with Enhanced Thermal Conductivity for Efficient Energy Harvesting and Superior EMI Shielding

Yang Yabi, Liu Shuang, Jin Liang, Li Guo, Quan Bingqing, Chen Qiufei, Tang Xiangying, Ji Xiaofan, Wu Hao, Lu Xiang, Qu Jinping

doi:10.1016/j.compositesa.2023.107803

一种新型多源能量收集器,具有增强的热传导性,可实现高效能量收集和出色的电磁干扰屏蔽

With the rapid growth of industries, renewable energy sources like wind and solar have emerged as prominent alternatives. However, their inherent intermittency demands the development of efficient energy harvester technologies. Conventional energy harvesters are limited to capturing a single energy type, resulting in compromised storage capabilities. Moreover, the detrimental effects of electromagnetic interference (EMI) on equipment necessitate immediate attention. To address these challenges, we present the development of a novel phase change composite, CMW@PEG, which possesses remarkable enhancements in thermal conductivity (1.26 W/m∙K), electrical conductivity (71.9 S/cm), and UV absorption capacity (close to 1). Notably, this composite exhibits an outstanding EMI shielding capability of 49.36 dB, safeguarding equipment operations effectively. Furthermore, it showcases impressive solar-thermal (87.9%) and electric-thermal (93.3%) conversion efficiencies. The unique properties of CMW@PEG offer a pioneering strategy for harnessing and utilizing renewable energy efficiently and hold tremendous promise in advancing the sustainable energy landscape.

随着工业的快速发展,风能和太阳能等可再生能源已成为重要的替代能源。然而,它们固有的间歇性要求开发高效的能量收集器技术。传统的能量收集器仅限于捕捉单一类型的能量,导致存储能力大打折扣。此外,电磁干扰(EMI)对设备的有害影响也需要立即引起重视。为了应对这些挑战,我们开发了一种新型相变复合材料 CMW@PEG,它在导热性(1.26 W/m∙K)、导电性(71.9 S/cm)和紫外线吸收能力(接近 1)方面都有显著提高。值得注意的是,这种复合材料的电磁干扰屏蔽能力高达 49.36 dB,可有效保护设备运行。此外,它还具有出色的太阳-热转换效率(87.9%)和电-热转换效率(93.3%)。CMW@PEG 的独特性能为高效利用可再生能源提供了一种开创性的策略,在推动可持续能源领域的发展方面前景广阔。


Composites Part B: Engineering

The oxide-layer configuration alteration and pseudo-ductile crack propagation mechanisms in composites induced by different relative thicknesses of CVI HfC-SiC multiphase matrix

Shi Xinhao, Feng Tao, Hou Wanbo, Ding Jiahui, Liu Xianglei, Lin Hongjiao, Tong Mingde

doi:10.1016/j.compositesb.2023.111012

不同相对厚度的 CVI HfC-SiC 多相基体诱导复合材料中氧化层构型的改变和伪电导裂纹扩展机制

Carbon fiber-reinforced HfC-SiC ceramic matrix composites (Cf/HfC-SiC) with different HfC-SiC matrix thicknesses were prepared by the chemical vapor infiltration method. The microstructure, ablation, and pseudo-ductile fracture behaviors of the composites were studied. The results proved that with the change of the HfC-SiC layer relative thickness, the oxide-layer configuration changed to promote its densification, which improved the ablative protection and mechanical properties of Cf/HfC-SiC composites. After ablation, when the relative volume proportion of the HfC-SiC matrix was the utmost (24.7/15.5), the composites had the best ablation resistance due to the tubular lamination configuration HfO2 layer. This caused the composite to have the highest residual bending strength (215.8MPa) and strength retention rate (79.7%). In addition, a pseudo-ductile crack propagation model was established to determine the influence of the induction of residual stress and the relative HfC-SiC layer thickness on the fracture behavior in the composites. Results suggested that in the real crack deflection mechanism, due to the induction of residual stress, the stress state in the HfC-SiC matrix with the increase of the HfC layer thickness changed to form more ring deflection cracks at the HfC/SiC interface. It provides a way to study the pseudo-ductility behavior of multiphase matrix composites and explain the improvement of its predictability and failure.

采用化学气相渗透法制备了不同 HfC-SiC 基体厚度的碳纤维增强 HfC-SiC 陶瓷基复合材料(Cf/HfC-SiC)。研究了复合材料的微观结构、烧蚀和假韧性断裂行为。结果证明,随着 HfC-SiC 层相对厚度的变化,氧化物层的构型也发生了变化,从而促进了其致密化,提高了 Cf/HfC-SiC 复合材料的烧蚀保护性能和力学性能。烧蚀后,当 HfC-SiC 基体的相对体积比例最大(24.7/15.5)时,由于 HfO2 层呈管状层叠构造,复合材料的抗烧蚀性能最好。这使得复合材料具有最高的残余弯曲强度(215.8MPa)和强度保持率(79.7%)。此外,还建立了一个假导裂纹扩展模型,以确定残余应力的诱导和 HfC-SiC 层的相对厚度对复合材料断裂行为的影响。结果表明,在真实的裂纹偏转机制中,由于残余应力的诱导,HfC-SiC 基体中的应力状态随着 HfC 层厚度的增加而改变,在 HfC/SiC 界面形成更多的环形偏转裂纹。这为研究多相基复合材料的假韧性行为提供了一种方法,并解释了如何提高其可预测性和失效性。


Herbaceous lignin valorization through integrated copper-catalyzed hydrogenolysis and chemical functionalization

Yin Wen-Zheng, Xiao Ling-Ping, Wang Qiang, Lv Yi-Hui, Zou Shuang-Lin, Wei Zhiyong, Sun Run-Cang

doi:10.1016/j.compositesb.2023.111013

通过铜催化综合氢解和化学功能化实现草本木质素的价值化

Lignin is an important biomass resource to replace petrochemical industry for carbon neutrality. However, it is challenged by unyielding the trade-off between activity and selectivity owing to the chemical complexity and inherent heterogeneity of lignin biomacromolecule. Herein, we report that copper nanomaterial (CuO/C) derived from metal-organic framework (HKUST-1) could effectively catalytic hydrogenolysis of herbaceous plants into monomeric phenols (up to 29.5 wt%) through a lignin-first strategy, affording methyl 3-(4-hydroxyphenyl) propionate (1-H) and methyl 3-(4-hydroxy-3-methoxyphenyl) propionate (2-G) as the main monophenols with high selectivity of 31.9% and 17.3%. Moreover, we proposed two synthetic routes based on the purification and functionalization of those two compounds (1-H and 2-G) to synthesis 3-(4-carboxyphenyl) propionic acid and functional polyesters. Subsequent studies revealed that the temperature of 50% mass loss of the two polyesters reached 430–440 °C, indicating their robust thermal stability; while the DSC curves showed the difference between the two polymers in glass conversion temperature (Tg) and crystallization. In brief, this work opens a new avenue for the production of lignin-derived chemicals and materials.

木质素是一种重要的生物质资源,可替代石化工业实现碳中和。然而,由于木质素生物大分子的化学复杂性和内在异质性,它面临着活性和选择性之间难以权衡的挑战。在此,我们报告了源自金属有机框架(HKUST-1)的纳米铜材料(CuO/C)可通过木质素优先策略有效地催化草本植物氢解为单体酚(高达 29.5 wt%),得到 3-(4-羟基苯基)丙酸甲酯(1-H)和 3-(4-羟基-3-甲氧基苯基)丙酸甲酯(2-G)作为主要的单体酚,其选择性高达 31.9% 和 17.3%。此外,我们还提出了基于这两种化合物(1-H 和 2-G)的纯化和功能化的两条合成路线,以合成 3-(4-羧基苯基)丙酸和功能性聚酯。随后的研究发现,这两种聚酯的 50% 质量损失温度达到了 430-440 ℃,表明它们具有很强的热稳定性;而 DSC 曲线则显示了两种聚合物在玻璃转化温度 (Tg) 和结晶方面的差异。简而言之,这项工作为生产木质素衍生化学品和材料开辟了一条新途径。


Construction of C/SiC–Cu3Si–Cu interpenetrating composites for long-duration thermal protection at 2500 °C by cooperative active-passive cooling

Wu Yue, Zhao Rida, Liang Bin, Pang Shengyang, Hu Chenglong, Li Jian, Cheng Hui–Ming, Tang Sufang

doi:10.1016/j.compositesb.2023.111015

通过主动-被动协同冷却构建用于 2500 ℃ 长时间热保护的 C/SiC-Cu3SiCu 互穿复合材料

Developing materials which can resist long-term ablation at ultra-high temperatures above 2200 °C in oxygen-containing environments is of prime importance for the thermal protection of aerospace vehicles, but remains a great challenge. C/SiC composites are attractive candidates for long-term use, but they are often severely ablated above 1650 °C due to the damage of protective oxide scale. Here, C/SiC–Cu3Si–Cu interpenetrating composites with interconnected ceramic and metal matrixes are developed by the selective ceramization of carbon-fiber reinforced carbon aerogel preforms. The heat radiation of C/SiC–Cu3Si–Cu, transpiration of Cu2O, evaporation of SiO2, as well as inhibition of oxygen diffusion in the glassy scale, jointly lead to the cooperative active-passive cooling during ablation. Resultantly, their surface temperatures are 150 °C, 450 °C and 750 °C lower than those for C/SiC (1900 °C, 2200 °C and 2500 °C) with a duration of 600 s ablation, respectively. They also exhibit remarkably low mass and linear ablation rates with respective 0.054–0.064 mg cm−2 s−1 and -0.157–0.018 μm s−1. Additionally, the composites can endure 1160 s ablation with a surface temperature of 1750 °C under the ablation condition where the surface temperature of C/SiC is 2200 °C. The developed C/SiC–Cu3Si–Cu interpenetrating composites are so far the only known light-weight (<3.0 g cm−3), non-ablation materials which can offer long-duration (≥600 s) thermal protection at 2200–2500 °C in high-enthalpy-flow and oxidizing environments.

开发能够在含氧环境中抵抗 2200 °C 以上超高温长期烧蚀的材料对于航空航天飞行器的热保护至关重要,但这仍然是一项巨大的挑战。C/SiC 复合材料是长期使用的理想材料,但由于保护性氧化物鳞片的破坏,它们在 1650 ℃ 以上通常会发生严重烧蚀。在这里,通过对碳纤维增强碳气凝胶预制件进行选择性陶瓷化,开发出了陶瓷和金属基体相互连接的 C/SiC-Cu3Si-Cu 互穿复合材料。在烧蚀过程中,C/SiC-Cu3Si-Cu 的热辐射、Cu2O 的蒸发、SiO2 的蒸发以及玻璃鳞片对氧扩散的抑制共同导致了主动-被动冷却。因此,在 600 秒的烧蚀持续时间内,它们的表面温度分别比 C/SiC 低 150 ℃、450 ℃ 和 750 ℃(1900 ℃、2200 ℃ 和 2500 ℃)。它们还表现出极低的质量和线性烧蚀率,分别为 0.054-0.064 mg cm-2 s-1 和 -0.157-0.018 μm s-1。此外,在 C/SiC 表面温度为 2200 ℃ 的烧蚀条件下,复合材料可承受 1160 秒的烧蚀,表面温度为 1750 ℃。所开发的 C/SiC-Cu3Si-Cu 互穿复合材料是迄今为止已知的唯一一种轻质(<3.0 g cm-3)、非烧蚀材料,可在 2200-2500 ℃ 的高焓流和氧化环境中提供长时间(≥600 秒)的热保护。


Insight into tuning of ZrO2 distribution and mechanical properties of directionally solidified Al2O3/(5Re0.2)AG/ZrO2 eutectic ceramic composites

Zhong Yujie, Li Zhe, Wang Xu

doi:10.1016/j.compositesb.2023.111016

定向凝固 Al2O3/(5Re0.2)AG/ZrO2 共晶陶瓷复合材料的 ZrO2 分布和力学性能调控透视

A novel Al2O3/(Y0.2Er0.2Yb0.2Ho0.2Lu0.2)3Al5O12((5Re0.2)AG)/ZrO2 eutectic high entropy oxide ceramic composites (HEOCs) was prepared by the directional solidification technique. The Al2O3/(5Re0.2)AG/ZrO2 eutectic HEOCs had a refined microstructure and different crystallographic orientation relationships of <10-10>Al2O3 || <103>(5Re0.2)AG || <100>ZrO2, {11–20}Al2O3 || {100}(5Re0.2)AG || {100}ZrO2, {0001} Al2O3 || {103}(5Re0.2)AG || {100}ZrO2 compared to Al2O3/YAG/ZrO2 eutectic ceramic composites. ZrO2 was distributed more uniformly and dispersedly in Al2O3/(5Re0.2)AG/ZrO2 eutectic HEOCs than in Al2O3/YAG/ZrO2 due to the similar volume strain of Al2O3/(5Re0.2)AG, (5Re0.2)AG/ZrO2 and Al2O3/ZrO2. As a result, mechanical performance including hardness, elastic modulus, and fracture toughness had been greatly improved because of the refined microstructure, tailored interfacial structure, and homogeneous distribution of ZrO2 caused by the introduction of the high entropy (5Re0.2)AG.

通过定向凝固技术制备了新型 Al2O3/(Y0.2Er0.2Yb0.2Ho0.2Lu0.2)3Al5O12((5Re0.2)AG)/ZrO2 共晶高熵氧化物陶瓷复合材料(HEOCs)。Al2O3/(5Re0.2)AG/ZrO2共晶高熵氧化物陶瓷复合材料具有精细的微观结构和不同的晶体取向关系:<10-10>Al2O3 || <103>(5Re0.2)AG||<100>ZrO2、{11-20}Al2O3 ||{100}(5Re0.2)AG ||{100}ZrO2 、{0001}Al2O3 ||{103}(5Re0.2)AG ||{100}ZrO2 与 Al2O3/YAG/ZrO2 共晶陶瓷复合材料相比。由于 Al2O3/(5Re0.2)AG、(5Re0.2)AG/ZrO2 和 Al2O3/ZrO2 的体积应变相似,因此与 Al2O3/YAG/ZrO2 相比,ZrO2 在 Al2O3/(5Re0.2)AG/ZrO2 共晶 HEOC 中的分布更加均匀和分散。因此,由于引入了高熵 (5Re0.2)AG 使微观结构更精细、界面结构更合理、ZrO2 分布更均匀,包括硬度、弹性模量和断裂韧性在内的机械性能得到了极大改善。


Recent advances on stimuli-responsive biopolymer-based nanocomposites for drug delivery

Xiao Renhua, Zhou Guangying, Wen Yuming, Ye Junhu, Li Xiaoyun, Wang Xiaoying

doi:10.1016/j.compositesb.2023.111018

用于给药的刺 激响应型生物聚合物基纳米复合材料的最新进展

Drug delivery plays a crucial part in medical therapy, where stimuli-responsive nanocarriers exhibit high delivery efficacy through changing their physicochemical properties in response to in vivo or external stimuli. In particular, biopolymer-based nanocomposites have attracted great attention as drug carriers due to their good biocompatibility, biodegradation, easy modification, low immunogenicity, and so on. They can be designed to transform size, charge and/or stability to prolong the blood circulation, accumulate at the diseased site, penetrate in tissues, internalize to target cells, and finally deliver and control drug release on demand under endogenous stimuli (e.g., acidic pH, enzymes and GSH), exogenous stimuli (e.g., temperature, light, magnetic field, and ultrasound), and both endogenous and exogenous stimuli. Different from the reviews on stimuli-responsive nanocomposites based on single biopolymer or general ideas of biopolymer-based nanocomposites, this paper summarizes strategies and recent progress of stimuli-responsive nanocomposites based on biopolymers such as polysaccharides (chitosan, hyaluronic acid, alginate, cyclodextrin, starch and cellulose) and proteins (gelatin, silk fibroin and collagen), and details their fabrication and application in drug delivery. Furthermore, this review provides evidence and ideas for designing stimuli-responsive nanocomposites for drug delivery.

药物输送在医学治疗中起着至关重要的作用,刺 激响应型纳米载体通过改变其物理化学特性来响应体内或外部刺  激,从而表现出较高的输送效果。其中,生物聚合物基纳米复合材料因其良好的生物相容性、生物降解性、易修饰性、低免疫原性等特点,作为药物载体备受关注。在内源性刺 激(如酸性 pH 值、酶和 GSH)、外源性刺 激(如温度、光、磁场和超声波)以及内源性和外源性刺 激的作用下,纳米复合材料可以通过改变尺寸、电荷和/或稳定性来延长血液循环、在病变部位积聚、穿透组织、内化为靶细胞,并最终按需递送和控制药物释放。与基于单一生物聚合物的刺 激响应纳米复合材料的综述或基于生物聚合物的纳米复合材料的一般观点不同,本文总结了基于多糖(壳聚糖、透明质酸、海藻酸、环糊精、淀粉和纤维素)和蛋白质(明胶、蚕丝纤维素和胶原蛋白)等生物聚合物的刺 激响应纳米复合材料的策略和最新进展,并详细介绍了其制备和在药物输送中的应用。此外,本综述还为设计用于给药的刺 激响应型纳米复合材料提供了证据和思路。


Additive Manufacturing of Polyaryletherketone (PAEK) polymers and their composites

Yap Timothy, Heathman Nathaniel, Phillips Tim, Beaman Joseph, Tehrani Mehran

doi:10.1016/j.compositesb.2023.111019

聚芳醚酮 (PAEK) 聚合物及其复合材料的增材制造

Polyaryletherketone (PAEK) polymers are unique thermoplastics certified for aerospace and biomedical applications, demonstrating exceptional thermo-mechanical characteristics and superior chemical resistance. They are adaptable to material extrusion (ME) and laser powder bed fusion (L-PBF) additive manufacturing systems. While various PAEK grades for additive manufacturing (AM) exist, their printing suitability, especially inter-layer strength, is not well-understood. Adding small amounts of short carbon fibers to PAEKs enhances their stiffness and service temperature but modifies their processing, structure, and properties. This study examines the effects of the AM method (L-PBF and ME) and carbon fiber addition on the structure, mechanical properties, and crystallinity of three different PAEK polymers. We characterize and correlate tensile properties, fracture modes, degree of crystallinity, fiber length and orientations, and porosity of the samples. Our findings aim to refine AM processes and feedstock materials for semi-crystalline polymers and their composites, offering insights for designing robust, economical AM parts.

聚芳醚酮(PAEK)聚合物是一种独特的热塑性塑料,经认证可用于航空航天和生物医学领域,具有优异的热机械特性和出色的耐化学性。它们适用于材料挤压(ME)和激光粉末床熔融(L-PBF)增材制造系统。虽然有各种用于增材制造(AM)的 PAEK 牌号,但它们的打印适用性,尤其是层间强度,还没有得到很好的了解。在 PAEK 中添加少量短碳纤维可提高其刚度和使用温度,但会改变其加工、结构和性能。本研究探讨了 AM 方法(L-PBF 和 ME)和碳纤维添加对三种不同 PAEK 聚合物的结构、机械性能和结晶度的影响。我们对样品的拉伸性能、断裂模式、结晶度、纤维长度和取向以及孔隙率进行了表征和关联分析。我们的研究结果旨在完善半结晶聚合物及其复合材料的 AM 工艺和原料材料,为设计坚固、经济的 AM 部件提供启示。


EGCG modified small intestine submucosa promotes wound healing through immunomodulation

Nie Rong, Zhang Qing-Yi, Tan Jie, Feng Zi-Yuan, Huang Kai, Sheng Ning, Jiang Yan-Lin, Song Yu-Ting, Zou Chen-Yu, Zhao Long-Mei, Li He-Xi, Wang Rui, Zhou Xing-Li, Hu Juan-Juan, Wu Chen-Yu, Li-Ling Jesse, Xie Hui-Qi

doi:10.1016/j.compositesb.2023.111005

经 EGCG 修饰的小肠黏膜下层通过免疫调节促进伤口愈合

Decellularized porcine small intestinal submucosa (SIS) has shown promising therapeutic efficacy as a functional wound dressing. Nevertheless, its limited anti-oxidative and immunomodulatory capacities have restricted its application for the treatment of complex skin wounds. Herein, epigallocatechin gallate (EGCG), a polyphenolic compound, was employed for the modification of the SIS to overcome such shortcomings. The EGCG-modified SIS (E-SIS) has shown excellent biocompatibility and improved hydrophilicity for cell adhesion. Notably, in vitro studies showed that the E-SIS could effectively alleviate oxidative stress and facilitate the M1-to-M2 phenotype transition of macrophages, thereby creating a favorable immune microenvironment for cell proliferation, migration, collagen synthesis as well as angiogenesis. A full-thickness skin defect model, combined with macrophage depletion, has further confirmed that the E-SIS could accelerate skin wound repair through immunomodulation in vivo. This suggested that the EGCG modification could provide a facile yet effective method to broaden the applications of the SIS for skin wound management.

脱细胞猪小肠粘膜下层(SIS)作为一种功能性伤口敷料已显示出良好的治疗效果。然而,由于其抗氧化和免疫调节能力有限,限制了其在治疗复杂皮肤伤口方面的应用。本文采用表没食子儿茶素没食子酸酯(EGCG)这种多酚化合物对 SIS 进行改性,以克服这些缺点。表没食子儿茶素没食子酸酯修饰的 SIS(E-SIS)具有良好的生物相容性,并改善了细胞粘附的亲水性。值得注意的是,体外研究表明,E-SIS 能有效缓解氧化应激,促进巨噬细胞的 M1-M2 表型转化,从而为细胞增殖、迁移、胶原蛋白合成和血管生成创造有利的免疫微环境。全厚皮肤缺损模型结合巨噬细胞耗竭进一步证实,E-SIS 可通过体内免疫调节加速皮肤伤口修复。这表明,对 EGCG 进行改性可以提供一种简便而有效的方法,扩大 SIS 在皮肤伤口管理方面的应用。


Composites Science and Technology

Controllable deformation design for 4D-printed active composite structure: Optimization, simulation, and experimental verification

Peng Xiang, Liu Guoao, Wang Jun, Li Jiquan, Wu Huaping, Jiang Shaofei, Yi Bing

doi:10.1016/j.compscitech.2023.110265

4D 打印活性复合材料结构的可控变形设计:优化、模拟和实验验证

Through integrating active composites and 4D printing techniques, active composites can achieve the pre-designed complex deformations. However, the tremendous design space of multiple materials brings the challenges of finding the optimum material distributions accurately, and the consistencies between simulated optimum results and actual experimental structures. Therefore, the controllable deformation design framework is proposed to guide the inverse design of 4D-printed active composite structure. The material properties of polylactic acid (PLA) and thermoplastic polyurethane (TPU) are tested and integrated into forward deformation analysis to improve the prediction accuracy of finite element analysis (FEA). An optimization integration framework with genetic algorithm is developed to optimize the material distribution and external displacement simultaneously to achieve the target deformation. Several voxelized beams and flower structures are used as engineering cases. The simulated and experimental deformation shapes and recovery shapes for the optimum structures are consistent with the target deformations. The mean squared errors (MSEs) of experimental shape and simulation shape are 0.62 mm and 0.27 mm for flower structures. These results show that the proposed methodology can obtain target deformation in simulation and experimental tests simultaneously, which can be applied into the flexible deformation design of complex active composite structures in the future.

通过将活性复合材料与 4D 打印技术相结合,活性复合材料可以实现预先设计的复杂变形。然而,多种材料的巨大设计空间带来了如何准确找到最佳材料分布以及模拟最佳结果与实际实验结构之间一致性的挑战。因此,本文提出了可控变形设计框架来指导 4D 打印活性复合材料结构的逆向设计。测试了聚乳酸(PLA)和热塑性聚氨酯(TPU)的材料特性,并将其纳入正向变形分析,以提高有限元分析(FEA)的预测精度。利用遗传算法开发了一个优化集成框架,可同时优化材料分布和外部位移,以实现目标变形。多个体素化梁和花结构被用作工程案例。优化结构的模拟和实验变形形状和恢复形状与目标变形一致。花朵结构的实验形状和模拟形状的均方误差(MSE)分别为 0.62 毫米和 0.27 毫米。这些结果表明,所提出的方法可以在模拟和实验测试中同时获得目标变形,未来可应用于复杂主动复合材料结构的柔性变形设计。


A strength based thermo-mechanical coupled cohesive zone model for simulating heat flux induced interface debonding

Shi Tianxiang, Zhang Yongqiang, Zhang Xin, Wang Yangyang, Zheng Kehong

doi:10.1016/j.compscitech.2023.110255

基于强度的热机械耦合内聚区模型,用于模拟热通量诱导的界面剥离

A thermo-mechanical strength based cohesive zone model is proposed to simulate the behaviour of an imperfect interface. In this model, the load transfer behaviour is described by the strength model rather than the traditional traction-separation law, and the heat transfer behaviour is delineated by the interface conductance including the bonding conductance, the air conductance and the contact conductance. A new damage state variable is introduced in the derivation, which needs to be updated even during the elastic stage. A reasonable assumption is made to reduce the dimension of the failure surface to simplify the model. The proposed model is validated by the comparison of the simulating results and experimental data. It is concluded that the thermo-mechanical strength based cohesive zone model provides the interaction mechanism between interface load and heat transfer and can effectively simulate the interface behaviour at various temperatures.

本文提出了一种基于热机械强度的内聚区模型,用于模拟不完全界面的行为。在该模型中,载荷传递行为由强度模型而非传统的牵引分离定律来描述,热传递行为由界面电导(包括结合电导、空气电导和接触电导)来描述。在推导过程中引入了一个新的损伤状态变量,即使在弹性阶段也需要更新。为了简化模型,我们合理地假设减小了破坏面的尺寸。模拟结果与实验数据的对比验证了所提出的模型。结论是基于热机械强度的内聚区模型提供了界面载荷和热传递之间的相互作用机制,可以有效模拟不同温度下的界面行为。


Novel fabrication of hydrophobic poly(p-phenylene terephthalamide) paper with superior tear strength and high dielectric breakdown strength

Li Na, Song Shubin, Yu Junrong, Wang Yan, Hu Zuming

doi:10.1016/j.compscitech.2023.110266

具有优异撕裂强度和高介电击穿强度的新型疏水性聚(对苯二甲酰对苯二胺)纸的制造方法

Complicated manufacture of poly(p-phenylene terephthalamide) (PPTA) paper limits its wider application. In this study, the facile gelation process was proposed to fabricate PPTA paper by injecting spontaneous-gelling low molecular weight PPTA (LMW-PPTA) solution onto the surface of non-woven PPTA fabric composed of chopped PPTA fibers. Subsequently, the PPTA papers and hydrophobic poly(vinylidene fluoride) (PVDF) doped PPTA paper were eventually obtained by gelation, washing and pressing. The mechanical properties, electric insulation property and hydrophobicity of PPTA papers were apparently affected by the ratio of chopped PPTA fibers to LMW-PPTA polymers and the content of PVDF in the paper. Significantly, the facile-process and low-cost composite PPTA papers were proved with high tear strength, preeminent dielectric breakdown strength, great thermal stability and superior hydrophobicity, which shed light on a promising direction for developing high-performance insulating materials and honeycomb materials.

聚对苯二甲酰对苯二胺(PPTA)纸制造工艺复杂,限制了其广泛应用。本研究提出了一种简便的凝胶化工艺,将自发凝胶化的低分子量聚对苯二甲酰对苯二胺(LMW-PPTA)溶液注入由切碎的聚对苯二甲酰对苯二胺(PPTA)纤维组成的非织造聚对苯二甲酰对苯二胺(PPTA)织物表面,从而制成聚对苯二甲酰对苯二胺(PPTA)纸。随后,通过凝胶化、洗涤和压制,最终得到 PPTA 纸和掺杂疏水性聚偏二氟乙烯(PVDF)的 PPTA 纸。PPTA 纸的机械性能、电绝缘性能和憎水性明显受到切碎的 PPTA 纤维与 LMW-PPTA 聚合物的比例以及纸中 PVDF 含量的影响。结果表明,这种工艺简便、成本低廉的 PPTA 复合纸具有很高的撕裂强度、优异的介电击穿强度、良好的热稳定性和优异的憎水性,为开发高性能绝缘材料和蜂窝材料指明了方向。



来源:复合材料力学仿真Composites FEM
ACTMechanicalAdditiveSystemFlux断裂复合材料化学航空航天增材制药风能裂纹材料控制
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【新文速递】2023年9月25日固体力学SCI期刊最新文章

今日更新:Journal of the Mechanics and Physics of Solids 2 篇,International Journal of Plasticity 1 篇,Thin-Walled Structures 2 篇Journal of the Mechanics and Physics of SolidsDynamic homogenization of heterogeneous piezoelectric media: A polarization approach using infinite-body Green’s functionLee Jeong-Ho, Zhang Zhizhou, Gu Grace X.doi:10.1016/j.jmps.2023.105442异质压电介质的动态均质化:使用无限体格林函数的极化方法Dynamic homogenization theories are powerful tools for describing and understanding the behavior of heterogeneous media such as composites and metamaterials. However, a major challenge in the homogenization theory is determining Green’s function of these media, which makes it difficult to predict their effective constitutive relations, particularly for the finite-size and/or non-periodic media in real-world applications. In this paper, we present a formulation for finding the elastodynamic effective constitutive relations for general heterogeneous media, including finite-size and non-periodic ones, via a polarization approach based on the Hashin–Shtrikman principle along with Green’s identities. Our proposed formulation relies on the infinite-body Green’s function of a homogeneous reference medium, making it free from the difficulty of determining Green’s function even for the homogenization of finite-size and/or non-periodic media. Additionally, we demonstrate the universal applicability of this formulation for both random and deterministic heterogeneous media. This work contributes to a better understanding of the homogenization theory and the design of next-generation metamaterials that require the accurate prediction of effective material characteristics for dynamic wave manipulation under desired operating environments.动态均质化理论是描述和理解复合材料和超材料等异质介质行为的有力工具。然而,均质化理论的一个主要挑战是确定这些介质的格林函数,这使得预测它们的有效构成关系变得十分困难,特别是对于实际应用中的有限尺寸和/或非周期介质。在本文中,我们根据哈申-施特里克曼原理和格林常数,通过极化方法提出了一种计算方法,用于计算一般异质介质(包括有限尺寸和非周期性介质)的弹性动力有效构成关系。我们提出的公式依赖于均质参考介质的无穷体格林函数,因此即使是有限尺寸和/或非周期介质的均质化,也能摆脱确定格林函数的困难。此外,我们还证明了这一公式对随机和确定性异质介质的普遍适用性。这项工作有助于更好地理解均质化理论和设计下一代超材料,这些超材料需要准确预测有效材料特性,以便在所需的工作环境下进行动态波操纵。Modeling heterogeneity and permeability evolution in a compaction band using a phase-field approachIp Sabrina C.Y., Borja Ronaldo I.doi:10.1016/j.jmps.2023.105441利用相场方法模拟压实带中的异质性和渗透性演变Compaction bands are tabular zones of localized compressive deformation associated with porosity and permeability reduction. Depending on their orientation, compaction bands can act as barriers to fluid flow, and can be detrimental to fluid production in oil and gas reservoirs, as well as in CO2sequestration. The process of permeability reduction and the development of excess pore pressures during compaction band formation in a heterogeneous rock mass are not fully understood. Furthermore, few studies have modeled compaction band formation considering coupled hydromechanical processes. In this study, we propose a coupled hydromechanical, phase-field approach for capturing the formation and propagation of compaction bands in heterogeneous porous media. Breakage mechanics is adopted to characterize the free energy function in the intact and damaged material. The resulting phase-field variable provides a measure of the degree of grain crushing. Permeability reduction in the zone of compaction localization is modeled using the Kozeny-Carman equation accounting for microstructural evolution. Numerical simulations demonstrate the ability of the model to capture compaction band formation, porosity reduction, and permeability evolution under drained and undrained conditions. The results highlight the role of effective confining pressure, drainage conditions, and material parameters on the styles of compaction bands that form.压实带是与孔隙度和渗透率降低有关的局部压缩变形的片状区域。根据其走向,压实带可成为流体流动的障碍,不利于油气藏以及二氧化碳储层的流体生产封存。人们对异质岩体中压实带形成过程中渗透率降低和孔隙压力过大的过程还不完全了解。此外,很少有研究在模拟压实带形成时考虑耦合的水文机械过程。在本研究中,我们提出了一种耦合水力学相场方法,用于捕捉异质多孔介质中压实带的形成和传播。采用破裂力学来描述完整和受损材料中的自由能函数。由此产生的相场变量提供了晶粒破碎程度的度量。压实局部区域的渗透性降低采用 Kozeny-Carman 方程建模,该方程考虑了微结构演变。数值模拟证明了该模型能够捕捉到排水和非排水条件下的压实带形成、孔隙度降低和渗透性演变。结果凸显了有效约束压力、排水条件和材料参数对压实带形成方式的作用。International Journal of PlasticityModeling a sample size-dependency of martensitic phase transformation using a mesoscale frameworkVasoya Manish, Lagoudas Dimitris C.doi:10.1016/j.ijplas.2023.103760利用中尺度框架模拟马氏体相变的样品尺寸依赖性Predicting a sample size-dependency of the constitutive response of any material system when it is being used in nano- and micro-scale devices, such as NEMS and MEMS, is very crucial for their design process. This also includes the shape memory alloys (SMAs), where predicting a sample size-dependency of the phase transformation process is the key aspect. Many experimental studies with micropillar compression tests showed an increase in critical stress to transformation and an increase in transformation hardening as the sample size decreases below a critical size. In this work, we have employed and extended a recently developed mesoscale framework to model such size effects in SMAs. A plane strain tensile SMA strip of finite width is analyzed within a small deformation framework. The martensitic transformation regions are modeled as Eshelby inclusions in an austenite phase matrix. Circular potential nucleation sites are considered with a square packing for their spatial locations and with nucleation stress assigned to each site from a Gaussian distribution. The combination of the Gaussian distribution of nucleation stress and the size of the nucleation site represents the underlying SMA material microstructure. Our numerical analysis, with varying values of the aspect ratio between the strip width and the nucleation site size, provides a critical value of the aspect ratio characterizing a transitioning length scale between a bulk vs. a sample size-dependent phase transformation behavior. At the transition, the critical stress to phase transformation and the transformation hardening increase drastically as the aspect ratio decreases below its critical value. The limitations of these predictions are discussed with existing literature on experimental observations, and some perspectives to improve the model are stated.当任何材料系统用于纳米和微米尺度设备(如 NEMS 和 MEMS)时,预测其构成响应的样品尺寸依赖性对其设计过程至关重要。这也包括形状记忆合金(SMA),其中预测相变过程的样品尺寸依赖性是关键环节。许多微柱压缩试验研究表明,当样品尺寸减小到临界尺寸以下时,转变的临界应力会增加,转变硬化也会增加。在这项工作中,我们采用并扩展了最近开发的中尺度框架,以模拟 SMA 中的这种尺寸效应。在小变形框架内分析了有限宽度的平面应变拉伸 SMA 带。马氏体转变区域被模拟为奥氏体相基体中的埃舍尔比夹杂物。考虑了圆形潜在成核点,其空间位置采用正方形包装,每个成核点的成核应力采用高斯分布。成核应力的高斯分布与成核点大小的组合代表了 SMA 材料的基本微观结构。我们的数值分析采用了条带宽度与成核点尺寸之间不同的纵横比值,从而得出了纵横比的临界值,该值表征了体积与样品尺寸相关相变行为之间的过渡长度尺度。在过渡阶段,当纵横比减小到临界值以下时,相变的临界应力和转变硬化会急剧增加。我们结合现有的实验观察文献讨论了这些预测的局限性,并提出了一些改进模型的观点。Thin-Walled StructuresNumerical and theoretical prediction of foreign object damage on AM355 simulated blade validated by ballistic impact testsZhang Hongbo, Hu Dayong, Ye Xubin, Chen Xin, He Yuhuaidoi:10.1016/j.tws.2023.111230通过弹道冲击试验验证 AM355 模拟叶片上异物损伤的数值和理论预测Foreign object damage (FOD) of aeroengine blade was a critical concern in aeroengine maintenance due to its potential impact on airworthiness. This study investigated FOD of simulated blades made of high-strength steel AM355 through a combination of experiments, finite element (FE) simulations, and theoretical analysis. Firstly, mechanical tests were conducted, including the quasi-static tensile tests at different triaxialities and temperatures, as well as Split-Hopkinson pressure bar (SHPB) tests. Experimental results showed that AM355 was sensitive to strain rate, with a 30.7% increase in yield strength observed at a strain rate of 3864 s−1. Then, a Johnson–Cook (J-C) model with failure criterion was developed and validated through FE analysis. The mechanical performance of AM355 was compared to that of TC4. Lastly, FOD tests accompanied by corresponding numerical simulations were conducted via the laboratory air gun device and the developed J-C model. The predicted notch morphologies and sizes agreed well with experimental observations, with the notch depth linearly increased with the increase of the projectile velocity. Finally, a FOD theory prediction model was developed through a spring-mass model based on Winkler&#39;s elastic-plastic foundation. The theoretical predictions were in good agreement with the numerical and experimental results, providing valuable insights for FOD assessment of real aeroengine blades.航空发动机叶片的异物损伤(FOD)对适航性有潜在影响,是航空发动机维护中的一个重要问题。本研究通过实验、有限元(FE)模拟和理论分析相结合的方法,对高强度钢 AM355 制成的模拟叶片的 FOD 进行了研究。首先,进行了机械试验,包括不同三轴度和温度下的准静态拉伸试验,以及斯普利特-霍普金森压力棒(SHPB)试验。实验结果表明,AM355 对应变速率很敏感,在应变速率为 3864 s-1 时,屈服强度提高了 30.7%。随后,通过有限元分析建立并验证了具有失效准则的约翰逊-库克(J-C)模型。将 AM355 的机械性能与 TC4 进行了比较。最后,通过实验室气 枪装置和所开发的 J-C 模型进行了 FOD 测试和相应的数值模拟。预测的缺口形态和大小与实验观察结果非常吻合,缺口深度随射弹速度的增加而线性增加。最后,通过基于温克勒弹塑性基础的弹簧-质量模型,建立了 FOD 理论预测模型。理论预测结果与数值和实验结果十分吻合,为实际航空发动机叶片的 FOD 评估提供了宝贵的见解。Effect of evolutionary anisotropic hardening on the prediction of deformation and forming load in incremental sheet forming simulationLee Hyung-Rim, Lee Myoung-Gyu, Park Namsudoi:10.1016/j.tws.2023.111231进化各向异性硬化对增量板材成形模拟中变形和成形载荷预测的影响The incremental sheet forming (ISF) process typically accompanies large plastic strain without fracture exceeding uniform elongation or ultimate tensile strength (UTS) in the uniaxial tensile test. Therefore, ISF features improved formability compared to the conventional stamping process. Meanwhile, numerous studies have focused on modeling and simulation of formability in ISF where anisotropic yield function is one of the key constitutive laws for predicting sheet deformation. However, the conventional yield function is defined based on anisotropy of initial yielding, while the ISF modeling requires the deformation behavior at large strains beyond the UTS. In this study, an evolutionary anisotropic plasticity model is investigated based on Hill&#39;s 48 yield function combined with the non-associated flow rule; i.e., e-NAFR Hill&#39;s 48. The e-NAFR Hill&#39;s 48 model is implemented to the vectorized user-defined material subroutine in the commercial finite element software ABAQUS/Explicit. Then, the proposed FE model is applied to the forming of truncated cone, pyramid, and clover shaped single point incremental forming (SPIF) of an aluminum alloy 6014-T4 sheet. The simulated part profile, thickness variation, and forming force are compared with those of experiments. The evolutionary constitutive model shows an average accuracy of 99.15% in thickness prediction and 94.22% accuracy in forming force, demonstrating the importance of evolutionary sheet anisotropy in the SPIF process.增量板材成形(ISF)工艺通常会产生较大的塑性应变,但不会在单轴拉伸试验中出现超过均匀伸长率或极限拉伸强度(UTS)的断裂。因此,与传统冲压工艺相比,ISF 具有更好的成形性。同时,许多研究都集中在 ISF 成型性的建模和模拟上,其中各向异性屈服函数是预测板材变形的关键构成法则之一。然而,传统的屈服函数是基于初始屈服的各向异性来定义的,而 ISF 建模则需要超出 UTS 的大应变变形行为。在本研究中,研究了基于希尔 48 屈服函数与非关联流动规则相结合的进化各向异性塑性模型,即 e-NAFR 希尔 48。e-NAFR Hill&#39;s 48 模型在商业有限元软件 ABAQUS/Explicit 的矢量化用户定义材料子程序中实现。然后,将所提出的有限元模型应用于铝合金 6014-T4 板材的截顶锥形、金字塔形和四叶草形单点增量成形(SPIF)。模拟的零件轮廓、厚度变化和成形力与实验结果进行了比较。进化构成模型在厚度预测方面的平均准确率为 99.15%,在成形力方面的平均准确率为 94.22%,证明了板材各向异性进化在 SPIF 过程中的重要性。来源:复合材料力学仿真Composites FEM

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