【新文速递】2023年10月10日固体力学SCI期刊最新文章

今日更新：Composite Structures 5 篇，Composites Part A: Applied Science and Manufacturing 1 篇，Composites Science and Technology 1 篇Composite StructuresTransverse curvature characterization of rectangular bistable CFRP laminates with a satellite capturing continuum robotic applicationNelon Christopher, Shepard Aaron, Walker Ian, Myers Oliverdoi:10.1016/j.compstruct.2023.117565应用卫星捕捉连续机器人的矩形双稳态 CFRP 层压材料的横向曲率特性分析The geometry of a bistable unsymmetric cross-ply carbon fiber reinforced polymer (CFRP) laminate impacts the observed stable configuration curvature. Continuum robotic systems can leverage the multi-stable nature of bistable CFRPs to contort to resemble continuous-bodied appendages observed in nature. The compliance of continuum robots facilitates grasping and manipulating objects such as non-cooperative, tumbling targets encountered in an on-orbit servicing operation. This work investigates large-scale bistable CFRP rectangular laminates previously unexplored in the literature to demonstrate the feasibility of scaling the laminates to meet the needs of potential applications. A numerical parametric study explored the relationship between aspect ratio, thickness, and stable configuration curvature. Non-dimensional parameters enabled the creation of a bifurcation diagram to characterize the stable shapes and bistability. Polynomial regression and machine learning delivered curvature prediction tools. Experiments using an air-bearing zero gravity spacecraft simulator evaluated the feasibility of incorporating rectangular bistable CFRP laminates in an on-orbit servicing continuum robotic system. The initial system resembled a crab claw to grasp target boxes, and the orientation and size of the target significantly contributed to the capture success rate. Future investigations of bistable CFRPs, especially from an application perspective, can benefit from predictive tools like ML to quantify the bistable characteristics.双稳态非对称交叉层碳纤维增强聚合物（CFRP）层压板的几何形状会影响观察到的稳定配置曲率。连续机器人系统可以利用双稳态碳纤维增强塑料的多稳态特性进行变形，使其类似于自然界中观察到的连续体附属物。连续机器人的顺应性有助于抓取和操纵物体，例如在轨道服务操作中遇到的不合作、翻滚的目标。这项研究调查了以前在文献中未曾探索过的大规模双稳态 CFRP 矩形层压板，以证明扩展层压板以满足潜在应用需求的可行性。数值参数研究探讨了长宽比、厚度和稳定配置曲率之间的关系。通过非维度参数创建了分岔图，以描述稳定形状和双稳态性。多项式回归和机器学习提供了曲率预测工具。使用空气承载零重力航天器模拟器进行的实验评估了将矩形双稳态 CFRP 层压材料纳入在轨服务连续机器人系统的可行性。最初的系统类似于螃蟹的爪子来抓取目标盒，目标的方向和大小对抓取成功率有很大影响。未来对双稳态 CFRP 的研究，尤其是从应用的角度来看，可以从量化双稳态特性的预测工具（如 ML）中获益。An efficient and high-volume fraction 3D mesoscale modeling framework for concrete and cementitious composite materialsBai Fengtao, Li Yishuo, Liu Libao, Li Xiaomin, Liu Wenxiudoi:10.1016/j.compstruct.2023.117576混凝土和水泥基复合材料的高效、高体积分数三维中尺度建模框架To address the cumbersome nature of mesoscale models for concrete as well as other similar materials, this paper presents an efficient and high-volume fraction mesoscale modeling framework with a novel aggregate surface tracking algorithm as well as an aggregate-cement interface interaction model to replace the interface transition zone (ITZ) in the three-dimensional space. This model could also be used in composite materials such as Fiber-reinforced polymer concrete. In this study, results are compared with the traditional 3 phases concrete models, uniaxial tension and compression models, and triaxial compression models for validation. The results show that the three-dimensional mesoscopic model can capture the detailed process of mesoscopic damage and the macroscopic behavior under different stress states while showing good agreement with the experimental results. It is demonstrated that compared with traditional methods, the new model can save up to 84% of the preprocessing and computation time and provides a more convenient and efficient scheme for the three-dimensional mesoscopic modeling of concrete alike composite materials with good accuracy. This paper also presents several 3D mesoscale models of Fiber-reinforced polymer concrete.为解决混凝土和其他类似材料中尺度模型的繁琐问题，本文提出了一种高效的高体积分数中尺度建模框架，该框架采用了一种新颖的骨料表面跟踪算法以及骨料-水泥界面相互作用模型，以取代三维空间中的界面过渡区（ITZ）。该模型还可用于纤维增强聚合物混凝土等复合材料。本研究将结果与传统的三相混凝土模型、单轴拉伸和压缩模型以及三轴压缩模型进行了比较，以进行验证。结果表明，三维中观模型可以捕捉到不同应力状态下中观损伤的详细过程和宏观行为，同时与实验结果有很好的一致性。结果表明，与传统方法相比，新模型可节省高达 84% 的预处理和计算时间，为混凝土异种复合材料的三维介观建模提供了更便捷、更高效、精度更高的方案。本文还介绍了几种纤维增强聚合物混凝土的三维中尺度模型。Modeling of Frontal Polymerization of Carbon Fiber and Dicyclopentadiene Woven Composites with Stochastic Material UncertaintyMohammad Sharifi Ahmadreza, Kwon Dong-Jun, Shah S.Z.H., Lee Juhyeongdoi:10.1016/j.compstruct.2023.117582具有随机材料不确定性的碳纤维和双环戊二烯编织复合材料正面聚合建模A novel finite element modeling framework is proposed for simulating dicyclopentadiene (DCPD) frontal polymerization in carbon fiber (CF) woven composites. A mesoscale CF/DCPD representative volume element (RVE) model was developed with two triggering directions, resulting out-of-plane and in-plane DCPD polymerization. The Arrhenius equation coupled with a modified Prout-Tompkins autocatalytic model was used to evaluate the dynamic DCPD polymerization process. The rate and degree of DCPD cure were calculated by the material property uncertainties of DCPD with and without random void inclusions (3% used as a reference in this work). The DCPD frontal polymerization in CF/DCPD composite was strongly influenced by triggering direction. In the RVE model considered in this work, DCFP frontal polymerization was slightly faster in the in-plane (warp/weft yarn) directions than the out-of-plane (thickness) direction; polymerization occurs first in DCPD resin and is followed by CF/DCPD interface. Material property uncertainty and void inclusion had significant effects on both out-of-plane and in-plane DCPD polymerization. A large variation in DCPD material properties and the presence of void inclusions significantly delayed the rate and degree of DCPD frontal polymerization. This work provides the preliminary estimation of the frontal polymerization of DCPD-based composites and guides the structural applications of these materials.本文提出了一种新型有限元建模框架，用于模拟碳纤维（CF）编织复合材料中的双环戊二烯（DCPD）正面聚合。开发了一种中尺度 CF/DCPD 代表体积元素 (RVE) 模型，该模型有两个触发方向，分别导致面外和面内 DCPD 聚合。阿伦尼斯方程与改进的 Prout-Tompkins 自催化模型相结合，用于评估动态 DCPD 聚合过程。DCPD 的固化速率和固化程度是通过有随机空隙夹杂物和无随机空隙夹杂物的 DCPD 的材料特性不确定性计算得出的（本工作中以 3% 作为参考）。CF/DCPD 复合材料中的 DCPD 正面聚合受触发方向的影响很大。在本文考虑的 RVE 模型中，DCFP 正面聚合在平面内（经纱/纬纱）方向比平面外（厚度）方向稍快；聚合首先发生在 DCPD 树脂中，其次是 CF/DCPD 界面。材料特性的不确定性和空隙夹杂对平面外和平面内的 DCPD 聚合都有显著影响。DCPD 材料特性的巨大差异和空隙夹杂物的存在大大延迟了 DCPD 正面聚合的速度和程度。这项研究对基于 DCPD 的复合材料的正面聚合进行了初步估算，为这些材料的结构应用提供了指导。Sound-absorption and mechanical properties of multisheet Gyroid lattice structures by StereolithographyZhang Junfang, Chen Xiaohong, Sun Yuanxi, Wang Yanmiao, Bai Longdoi:10.1016/j.compstruct.2023.117589通过立体光刻技术实现多片 Gyroid 晶格结构的吸音和机械特性Sound-absorbing materials with high load-bearing capacities are particularly important in many engineering applications. However, the low load-bearing capacity of conventional sound-absorbing materials limits their engineering applications. In this study, a multisheet parallel design concept is employed to design multisheet sound-absorbing and load-bearing lattice structures. Results show that the multisheet structure outperform the single-sheet lattice structure. The former exhibits a maximum absorption coefficient of 1, a 1x increase in the maximum average absorption coefficient, and a 127x increase in the maximum frequency compared with the latter. Under compression, the multisheet structure exhibits elastic modulus and yield strength values that are 0.43 and 0.52 times those of the single-sheet structure, respectively. Compared with different sound-absorbing structures, the multisheet structure exhibits remarkably high peak absorption coefficients and significant sound-absorbing performance advantages in specific frequency bands. This study presents a new design approach for creating multifunctional structures with sound-absorbing and load-bearing capabilities.在许多工程应用中，具有高承载能力的吸音材料尤为重要。然而，传统吸音材料的低承载能力限制了其工程应用。本研究采用多层平行设计理念来设计多层吸音和承重晶格结构。结果表明，多层结构优于单层晶格结构。前者与后者相比，最大吸声系数为 1，最大平均吸声系数提高了 1 倍，最大频率提高了 127 倍。在压缩条件下，多层结构的弹性模量和屈服强度值分别是单层结构的 0.43 倍和 0.52 倍。与不同的吸声结构相比，多片式结构的峰值吸声系数非常高，在特定频段具有显著的吸声性能优势。这项研究为创造具有吸音和承重能力的多功能结构提供了一种新的设计方法。Compression property and energy absorption capacity of 4D-printed deformable honeycomb structurePeng Xiang, Liu Guoao, Li Jiquan, Wu Huaping, Jia Weiqiang, Jiang Shaofeidoi:10.1016/j.compstruct.2023.1175914D 打印可变形蜂窝结构的压缩性能和能量吸收能力Honeycomb structures exhibit outstanding mechanical properties with specific unit cell configurations. We introduce a novel honeycomb structure that can enhance the compression property and energy absorption capacity by utilizing four-dimensional (4D) printing technology with polylactic acid (PLA) materials. In the designed honeycomb structure, the walls of the adjacent unit cells are independent, and the shape of the unit cells can be transformed between a hexagon and triangle under external loading and temperature stimulus. 4D printing technology is employed to prepare the honeycomb specimens, and the deformation processes of the innovative honeycombs are implemented. Structure I (a novel hexagonal honeycomb structure) and Structure II (a semi-triangular honeycomb structure) can be transformed into each other. Uniaxial quasi-static compression and impact tests are conducted to investigate the compression property and energy absorption capacity of the designed honeycomb structures. The results indicate that the novel honeycomb had a high compression property with Structure II, and had high energy absorption capacity with Structure I; thus, the developed honeycomb structures have broad application prospects for the multifunctional applications of honeycomb structures in the future.蜂窝结构通过特定的单胞结构表现出卓越的机械性能。我们利用聚乳酸（PLA）材料的四维（4D）打印技术，介绍了一种可增强压缩性能和能量吸收能力的新型蜂窝结构。在所设计的蜂窝结构中，相邻单元的壁是独立的，单元的形状可以在外部负载和温度刺 激下在六边形和三角形之间变换。利用 4D 打印技术制备了蜂窝试样，并实现了创新蜂窝的变形过程。结构 I（一种新型六边形蜂窝结构）和结构 II（一种半三角形蜂窝结构）可以相互转化。通过单轴准静态压缩和冲击试验，研究了所设计蜂窝结构的压缩性能和能量吸收能力。结果表明，结构 II 的新型蜂窝具有较高的压缩性能，结构 I 的新型蜂窝具有较高的能量吸收能力；因此，所开发的蜂窝结构在未来蜂窝结构的多功能应用方面具有广阔的应用前景。Composites Part A: Applied Science and ManufacturingEnhanced vibration damping and viscoelastic properties of flax/epoxy composites and their carbon fibre hybrid laminatesHosseinpour Dashatan Saeid, Sit Moumita, Zhang Zhongyi, Grossmann Erwan, Millot Jérémy, Huang Ya, Nath Dhakal Homdoi:10.1016/j.compositesa.2023.107819增强亚麻/环氧复合材料及其碳纤维混合层压板的减振和粘弹性能The damping and viscoelastic properties of flax/epoxy composites and their carbon fibre hybrid laminates are investigated. For this purpose, four different types of composite laminates using varied stacking sequences were fabricated by vacuum infusion process. The influence of various parameters on the vibration damping behaviour of flax and flax/carbon hybrid systems is investigated by using two techniques:shaker system utilising half-power bandwidth and dynamic mechanical analysis. In order to show the correlations between damping and mechanical properties, three-point bending tests are used to determine the bending stiffness of each stacking sequence. The results indicate that the location and number of flax plies contribute to the damping behaviour while the bending stiffness is mainly governed by location of carbon plies. Results show that the damping ratio varies for each vibration mode. Specimen type D, which contains the fewest number of carbon plies, exhibits higher values for both flexural stiffness and damping ratio compared to configuration B, which has the highest number of carbon layers. When comparing configurations B and C, it is observed that by trading off 8.1% of flexural stiffness, a substantial 34% increase in damping ratio was achieved in the second vibration mode.研究了亚麻/环氧复合材料及其碳纤维混合层压板的阻尼和粘弹性能。为此，采用不同的堆叠顺序，通过真空灌注工艺制作了四种不同类型的复合材料层压板。采用两种技术研究了各种参数对亚麻和亚麻/碳混合系统振动阻尼行为的影响：利用半功率带宽的振动台系统和动态机械分析。为了显示阻尼和机械性能之间的相关性，采用了三点弯曲试验来确定每个堆叠序列的弯曲刚度。结果表明，亚麻层的位置和数量对阻尼行为有影响，而弯曲刚度主要受碳层位置的影响。结果表明，每种振动模式的阻尼比都不同。与碳层数量最多的配置 B 相比，碳层数量最少的 D 型试样显示出更高的弯曲刚度和阻尼比值。在比较配置 B 和配置 C 时，可以发现通过牺牲 8.1% 的挠曲刚度，第二振动模式下的阻尼比大幅提高了 34%。Composites Science and TechnologyReinforcement of mica on phthalonitrile resin and composites: Curing, thermal, mechanical and dielectric propertiesZhao Dingxuan, Hu Jiqiang, Wang Dongqing, Yang Jinchuan, Zhang Hanqi, Wang Bingdoi:10.1016/j.compscitech.2023.110289在邻苯二腈树脂和复合材料上添加云母：固化、热、机械和介电特性High performance composites not only pursue high strength, light weight, but also need to have multifunctional characteristics. To further improve curing efficiency and mechanical properties of phthalonitrile resin (PN75) and give full play to its excellent thermal and dielectric properties, mica as reinforcement was introduced into PN75 to form particle-filled resin (Mica/PN75) and CFRP (Mica/PN75/CF) composites. The introduction of mica reduced the curing temperature of PN75 and improved the curing efficiency. The thermal stability of resin and composites was further improved. The bending strength of the two groups of mica reinforced resin increased by 44.87% and 55.97%, and the dielectric constant decreased from 3.3 to 2.7 and 2.5, respectively. The bending strength of the composites was increased by up to 19.9%, and the glass transition temperature of composites was increased by up to 26 °C after reinforcement. The multidirectional reinforcement of PN75 by mica was studied and analyzed in this work.高性能复合材料不仅要追求高强度、轻重量，还需要具备多功能特性。为了进一步提高邻苯二腈树脂（PN75）的固化效率和机械性能，充分发挥其优异的热性能和介电性能，在 PN75 中引入云母作为增强体，形成颗粒填充树脂（云母/PN75）和 CFRP（云母/PN75/CF）复合材料。云母的引入降低了 PN75 的固化温度，提高了固化效率。树脂和复合材料的热稳定性也得到了进一步提高。两组云母增强树脂的弯曲强度分别提高了 44.87% 和 55.97%，介电常数分别从 3.3 降至 2.7 和 2.5。增强后，复合材料的抗弯强度提高了 19.9%，复合材料的玻璃化转变温度提高了 26 ℃。本研究分析了云母对 PN75 的多向增强。来源：复合材料力学仿真Composites FEM