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【新文速递】2023年9月30日复合材料SCI期刊最新文章

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

Composites Part A: Applied Science and Manufacturing

Hydrogel with dual networks making reduced GO connection and orientation for a bi-directional thermal conductive film

Zhang Jianyu, Zhang Yintao, Yang Cheng, Jiang Xueliang, Tian Wensheng, Li Yanyu, Liu Runlu, Chen Zhixin, Pan Hui, Zhu Shenmin

doi:10.1016/j.compositesa.2023.107816

具有双网络的水凝胶可减少 GO 的连接和定向,从而形成双向导热膜

With the rapid development of modern electronic devices, materials having high thermal conductivities (TCs) both in in-plane and through-plane directions are specially needed for thermal management. Whereas, the construction of efficient thermal-conductive pathways in bi-directions is still a challenge. Herein, a facile gel-drying approach is developed, achieving the formation of bi-directional pathways with the assistance of a dual-network structure. During the process, cellulose nanocrystal (CNC) with a high intrinsic TC was mixed with gellable cellulose (CNF) to form CNF/2CNC dispersion which was then used as a matrix. Reduced graphene oxide (RGO) foam with a network structure was used as a filler. The RGO network was tightly wrapped by the formed CNF/2CNC cross-linking network, resulting in a hydrogel with a dual-network structure. After drying, the resultant RGO-foam-CNF/2CNC film not only has a long-range orientation path in the horizontal direction, but also maintained a connected path in the vertical direction. The resultant film with 18.5 wt % RGO exhibited high TCs of 14.06 W·m-1·K-1 and 2.47 W·m-1·K-1 simultaneous for in-plane and through-plane directions, which is 21.6 times and 9.88 times higher than those of a typical CNF film, respectively. This strategy offers a new avenue for the designs of soft, cuttable, environmentally friendly polymer composite films with high TCs in bi-directions.

随着现代电子设备的飞速发展,热管理特别需要在面内和面外都具有高导热率(TC)的材料。然而,在双向构建高效导热通道仍是一项挑战。在此,我们开发了一种简便的凝胶干燥方法,在双网络结构的辅助下形成双向导热通道。在此过程中,具有高固有热导率的纤维素纳米晶(CNC)与可凝胶纤维素(CNF)混合,形成 CNF/2CNC 分散体,然后用作基质。具有网络结构的还原氧化石墨烯(RGO)泡沫被用作填料。RGO 网络被形成的 CNF/2CNC 交联网络紧紧包裹,从而形成具有双网络结构的水凝胶。干燥后,得到的 RGO- 泡沫-CNF/2CNC 薄膜不仅在水平方向上具有长程取向路径,而且在垂直方向上也保持了连接路径。RGO 含量为 18.5 wt % 的薄膜在平面内和平面外同时表现出 14.06 W-m-1-K-1 和 2.47 W-m-1-K-1 的高 TC 值,分别是典型 CNF 薄膜的 21.6 倍和 9.88 倍。这种策略为设计具有双向高 TCs 的柔软、可切割、环保型聚合物复合薄膜提供了一条新途径。


Composites Part B: Engineering

New strategy for enhancing interfacial adhesion between carbon fiber and epoxy by using mussel-inspired polydopamine-Fe complex nanospheres

Wu Qing, Xiao Bolin, Liu Qianli, Deng Hao, Ye Ziyi, Li Yating, Yao Renjie, Zhu Jianfeng

doi:10.1016/j.compositesb.2023.111032

利用贻贝启发的聚多巴胺-铁复合纳米球增强碳纤维与环氧树脂界面粘附力的新策略

The liable interfacial delamination of carbon fiber composites is a long-lasting problem that restricts its widely application. One promising route is to hybridize fiber with nano-particles on account of their prominent mechanical properties and huge specific surface area, while trial using biobased nanoparticles are in its infancy. Mussel adhered firmly to the reef relies on its bushy byssal threads, which correlates with chelation of ferric ions with catechol-containing proteins. Inspired by this, we deposited synergistic bio-based polydopamine (PDA)-Fe complex nanospheres and silane coupling agent on carbon fiber by simply impregnation, which delivers increment of 56.4% in interfacial shear strength (IFSS) in epoxy matrix relative to untreated fiber composites. Results suggest that the improved epoxy wetting behavior that imparts full infiltration, the excellent adhesivity that eliminates weak interface layer, as well as strong but reversible PDA-Fe chelate crosslinks that advance tress transfer and energy dissipation, which are critical to IFSS growth. This work provides a new and attractive bio-nanomaterial of PDA-Fe in interfacial engineering of composites.

碳纤维复合材料易发生界面分层是一个长期存在的问题,限制了其广泛应用。由于纳米颗粒具有突出的机械性能和巨大的比表面积,将纤维与纳米颗粒杂化是一条很有前景的途径,而使用生物基纳米颗粒的试验还处于起步阶段。贻贝能牢固地附着在礁石上,靠的是其茂密的鳍丝,这与含儿茶酚的蛋白质螯合铁离子有关。受此启发,我们通过简单的浸渍法将生物基多多巴胺(PDA)-铁复合物纳米球和硅烷偶联剂协同沉积在碳纤维上,与未经处理的纤维复合材料相比,环氧基体的界面剪切强度(IFSS)提高了 56.4%。研究结果表明,环氧树脂润湿性能的改善使其能够充分浸润,出色的粘合性消除了薄弱的界面层,强韧但可逆的 PDA-Fe 螯合交联促进了应力传递和能量消耗,而这对 IFSS 的增长至关重要。这项工作为复合材料的界面工程提供了一种新的、有吸引力的 PDA-Fe 生物纳米材料。




来源:复合材料力学仿真Composites FEM
ACTMechanicalInspire复合材料电子ADSUG材料试验
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首次发布时间:2024-11-03
最近编辑:1月前
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【新文速递】2023年9月22日固体力学SCI期刊最新文章

International Journal of Solids and StructuresGraphic statics and symmetrySchulze Bernd, Millar Camerondoi:10.1016/j.ijsolstr.2023.112492图形静力学和对称性Reciprocal diagrams are a geometric construction dating back to Maxwell and Cremona in which a self-stressed plane framework with a planar graph is paired with another self-stressed reciprocal framework on the dual graph. Either one of the reciprocal frameworks is the form diagram of a self-stressable structure and the other is the force diagram of the corresponding axial forces. This geometric technique offers insights into the self-stresses and infinitesimal motions (mechanisms) of both frameworks in the reciprocal pair. For a symmetric framework with a fully-symmetric self-stress, we obtain an equi-symmetric reciprocal pair of plane frameworks, as well as the associated symmetric discrete dual Airy stress function polyhedra. In this paper we exploit symmetry to refine the Maxwell-Cremona correspondence by considering the decomposition of the self-stress and motion spaces into invariant subspaces corresponding to the irreducible representations of the symmetry group. As such, the familiar s = m∗ + 1 relationship for the number of self-stresses of a framework, s, and the number of mechanisms of the reciprocal,m*, is reworked into a symmetry adapted version which provides greater insights into the properties of the reciprocal framework pair. We also show how the quotient graph of a symmetric framework and its reciprocal can be used to efficiently detect infinitesimal motions, self-stresses and polyhedral liftings of different symmetry types. This allows for symmetry-adapted simplified structural analyses of symmetric structures.互易图是一种几何结构,可追溯到麦克斯韦和克雷莫纳,其中平面图上的自应力平面框架与对偶图上的另一个自应力互易框架配对。其中任何一个互易框架都是自应力结构的形式图,而另一个互易框架则是相应轴向力的力图。通过这种几何技术,可以深入了解互对框架中两个框架的自应力和无限小运动(机制)。对于具有完全对称自应力的对称框架,我们可以得到等对称互对平面框架,以及相关的对称离散双 Airy 应力函数多面体。在本文中,我们考虑将自应力和运动空间分解为对应于对称群不可还原表示的不变子空间,从而利用对称性来完善麦克斯韦-克雷莫纳对应关系。因此,我们所熟悉的s = m∗ + 1框架自应力的数量关系、s与倒数的机制数之间的 + 1 关系、m*的商图被重新制作成一个对称性适应版本,该版本能让我们更深入地了解互易框架对的特性。我们还展示了如何利用对称框架及其倒数的商图来有效检测不同对称类型的无限小运动、自应力和多面体提升。这样就可以对对称结构进行对称适配的简化结构分析。International Journal of PlasticityThe Mechanism for Li-addition Induced Homogeneous Deformation in Mg-4.5 wt. % Li AlloyXu Jing, Guan Bo, Xin Yunchang, Li Xiao, Wu Peidong, Huang Xiaoxu, Liu Qingdoi:10.1016/j.ijplas.2023.103763镁-4.5 wt%锂合金中锂离子添加诱导均匀变形的机理The mechanism by which Li additions induce a more homogeneous deformation was systematically investigated in this study by comparing the deformation behavior of pure Mg and Mg-4.5 wt. % Li using experiments, crystal plasticity simulations, and theoretical calculations. The results of the digital image correlation measurements showed that under tension along the transverse direction (TD), strong localized deformation bands with an angle of approximately 20° with respect to the TD were observed in pure Mg, but were absent in Mg-4.5 wt. % Li. Slip trace analyses indicated that basal slip was the predominant deformation mode for pure Mg, whereas that for Mg-4.5 wt. % Li was prismatic slip. A high relative activity of pyramidal slip, approximately 17%, was observed in Mg-4.5 wt. % Li at a high strain of 10%. Contraction or double twins were hardly detected during the entire tension process. Crystal plasticity simulations revealed that the 4.5 wt. % Li addition dramatically reduced the critical resolved shear stress (CRSS) ratio of pyramidal slip: prismatic slip: basal slip, which was 31.5:21:1 for pure Mg and 4.3:1.3:1 for Mg-4.5 wt. % Li. Theoretical calculations using the CRSS ratios determined by simulations revealed that easy and uniform deformation propagation induced by a dramatically reduced CRSS ratio of prismatic slip to basal slip played a more important role in improving the deformation homogeneity, in addition to the enhanced activity of pyramidal slip. The mechanisms for how Li additions improve the ductility of Mg are also revisited in this paper.本研究通过实验、晶体塑性模拟和理论计算,比较了纯镁和 Mg-4.5 wt. % Li 的变形行为,系统地研究了锂添加物诱导更均匀变形的机制。数字图像相关测量的结果表明,在沿横向(TD)拉伸的情况下,在纯镁中观察到与 TD 成约 20° 角的强局部变形带,但在 Mg-4.5 wt.滑移痕量分析表明,基底滑移是纯镁的主要变形模式,而镁-4.5 wt.在 10%的高应变下,Mg-4.5 wt. % Li 中的金字塔滑移相对活跃度较高,约为 17%。在整个拉伸过程中几乎检测不到收缩或双孪晶。晶体塑性模拟显示,4.5 wt. % Li 的添加大大降低了金字塔滑移:棱柱滑移:基底滑移的临界解析剪切应力(CRSS)比,纯 Mg 为 31.5:21:1,而 Mg-4.5 wt. % Li 为 4.3:1.3:1。利用模拟确定的 CRSS 比进行的理论计算显示,棱柱滑移与基底滑移的 CRSS 比急剧下降所引起的易于均匀变形传播,除了增强金字塔 滑移的活性外,在改善变形均匀性方面发挥了更重要的作用。本文还重新探讨了添加锂如何改善镁的延展性的机制。来源:复合材料力学仿真Composites FEM

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