【新文速递】2024年8月17日固体力学SCI期刊最新文章

今日更新：Composites Part A: Applied Science and Manufacturing 4 篇，Composites Part B: Engineering 2 篇Composites Part A: Applied Science and ManufacturingExcellent flame-retardant polycarbonate composites with improved notched impact toughness via introducing imine-functionalized polysiloxaneYue Zhu, Ronghua Yu, Jiangan You, Senhao Lei, Li Ma, Jie Liu, Tao Tangdoi:10.1016/j.compositesa.2024.108416 通过引入亚胺功能化聚硅氧烷，制备了具有缺口冲击韧性的优异阻燃聚碳酸酯复合材料Polycarbonate (PC) is known to suffer from damage over time, particularly in low-temperature settings besides its inherent flammability, where it can develop notches and lose its impact toughness. To address these issues, we synthesized schiff-based polysiloxane containing the benzene substituted with methoxy (referred to as PSOMe-X, X being the number of methoxy substitution on the benzene ring). Interestingly, by merely increasing the number of methoxy substitutions in PSOMe-X, the PC/PSOMe-X composites demonstrated significantly improved comprehensive performance. The PC/PSOMe-3 composite successfully passed the UL-94 (vertical burning test for Flammability of Plastic Materials for Parts in Devices and Appliances developed by Underwriters Laboratories) V-0 rating, and the limiting oxygen index (LOI) was increased to 29.9 %. This improvement was accompanied by a notable reduction in the peak heat release rate (PHRR) by 64 % and total smoke generation (TSP) by 18 %. Meanwhile the notched impact strength of the PC/PSOMe-3 composite was improved by 190 % at room temperature and 72 % at −25 °C. The mechanism for improved flame retardancy and impact tougheness for PC/PSOMe-X composites were unveiled.众所周知，随着时间的推移，聚碳酸酯(PC)会受到损害，特别是在低温环境下，除了其固有的可燃性之外，它还会产生缺口并失去其冲击韧性。为了解决这些问题，我们合成了含有甲氧基取代苯的席夫基聚硅氧烷(称为PSOMe-X, X是苯环上的甲氧基取代数)。有趣的是，通过增加PSOMe-X中甲氧基取代的数量，PC/PSOMe-X复合材料的综合性能得到了显著提高。PC/ psome3复合材料成功通过UL-94 (Underwriters Laboratories开发的设备和电器部件塑料材料可燃性垂直燃烧测试)V-0等级，极限氧指数(LOI)提高到29.9 %。与此同时，峰值热释放率(PHRR)显著降低了64% %，总烟雾生成率(TSP)显著降低了18% %。同时，PC/ psome3复合材料的缺口冲击强度在室温下提高了190 %，在- 25 ℃下提高了72 %。揭示了PC/PSOMe-X复合材料阻燃性和冲击韧性提高的机理。A facile route to fabricate transparent and mechanically robust glass-fabric reinforced composites via refractive index matching and tow-spreading techniqueLin Jiang, Tianqi Ji, Shuai Cao, Jie Sheng, Zhengqiang Huang, Jiquan Li, Tie Geng, Haihong Wudoi:10.1016/j.compositesa.2024.108418 通过折射率匹配和拖曳扩散技术制造透明和机械坚固的玻璃纤维增强复合材料的简单途径There are challenges to fabricate GFRPs with high optical clarity and mechanical performance due to the inevitable chromatic dispersion and yarn crimp in the fabric. Herein, a facile route to fabricate transparent glass-fabric reinforced composites is reported using refractive index matching and tow-spreading technique. By introducing different amount of BMA, the epoxy matrix could match the refractive index of glass fibers at different wavelength. The fabricated composites exhibit intriguing pale blue/blue, dark blue/ purple, purple-pink/pink chromatic dispersion, respectively. Among them, the 0.2 mm-thick GFRP with 4 % BMA (fiber volume fraction ≈ 50.4 %) exhibits the highest total transmittance (89.5 %) and lowest haze (3.4 %). Compared with commercial standard-tow fabric, composites with spread-tow fabrics exhibits less chromatic dispersion and transparency loss. Moreover, simultaneously reinforcing and toughening effect could be observed in the composites with BMA modified matrix. The optimized composites possess tensile strength of 289 MPa and flexural strength of 416 MPa.由于织物中不可避免的色散和纱线卷曲，制造具有高光学清晰度和机械性能的gfrp是一项挑战。本文报道了一种利用折射率匹配和拖曳扩散技术制备透明玻璃纤维增强复合材料的简便方法。通过引入不同量的BMA，环氧树脂基体可以匹配不同波长玻璃纤维的折射率。制备的复合材料分别呈现出迷人的淡蓝色/蓝色、深蓝色/紫色、紫粉色/粉色 色散。其中，BMA为4 %(纤维体积分数≈50.4 %)的0.2 mm厚GFRP的总透过率最高(89.5 %)，雾度最低(3.4 %)。与商用标准束织物相比，扩展束织物的复合材料具有较小的色散和透明度损失。BMA改性后的复合材料具有增强和增韧的双重作用。复合材料的抗拉强度为289 MPa，抗折强度为416 MPa。Interlaminar tensile strength of Alumina-Based Oxide/Oxide ceramic matrix composite at room temperature and 1200 °C using diametral compression test methodVinh Tung Le, Nicholas Parolini, Chunghao Shih, Abhendra Singhdoi:10.1016/j.compositesa.2024.108420氧化铝基氧化物/氧化物陶瓷基复合材料在室温和1200 ℃下的层间拉伸强度的直径压缩试验方法The diametral compression test method on circular disks is used in this study to determine the interlaminar tensile strength of an alumina-based Oxide/Oxide ceramic matrix composite at room temperature, 1200 °C, and at room temperature after being thermally aged for 150 h at 1200 °C. Digital image correlation was used in all the tests to measure the full-field strain and observe the progression of interlaminar failure. Post-test fractography was performed to identify the fracture characteristics. All the specimens failed along the disk diameter that coincided with the line of loading, proving the reliability and repeatability of the test method. The thermally aged specimens showed the stiffest response and the highest interlaminar tensile strength. This is attributed to further densification of the matrix due to the thermal aging, confirmed by microstructural characterization. The path of fracture at catastrophic failure traversed the matrix in both the inter-ply and intra-ply regions.本研究采用圆盘直径压缩试验方法，测定了氧化铝基氧化物/氧化物陶瓷基复合材料在室温、1200 °C和1200 °C热老化150 h后的室温层间拉伸强度。所有试验均采用数字图像相关法测量全场应变，观察层间破坏的进展情况。测试后进行断口分析以确定断裂特征。所有试件沿与加载线一致的盘径破坏，证明了试验方法的可靠性和可重复性。热时效试样的刚度响应最大，层间抗拉强度最高。显微组织表征证实，这是由于热老化导致基体进一步致密化所致。突变破坏时的断裂路径在层间和层内都穿过基体。Deep neural network homogenization of multiphysics behavior for periodic piezoelectric compositesQiang Chen, Ce Xiao, Zhibo Yang, Jonathan Tabet, Xuefeng Chendoi:10.1016/j.compositesa.2024.108421周期性压电复合材料多物理场行为的深度神经网络均匀化We present a physically informed deep neural network homogenization theory for identifying homogenized moduli and local electromechanical fields of periodic piezoelectric composites. The theory employs a multi-network model to represent solutions to stress equilibrium and electrostatic partial differential equations in the inclusion and the matrix phases, leading to a more accurate depiction of field variables. Satisfaction of periodicity conditions for hexagonal and cubic symmetries are efficiently tackled using a series of sinusoidal functions with known periods and adjustable parameters. Additionally, the theory applies fully trainable weights to the collocation points. These trainable weights, trained concurrently with the neural network weights, compel the neural networks to enhance their performance when faced with large local stress/deformation gradients. The predictive capability of the proposed theory is illustrated by comparison with finite-element solutions for composites reinforced with unidirectional fiber, spherical particle, or weakened by an ellipsoidal cavity over a wide range of volume fractions.提出了一种基于物理信息的深度神经网络均匀化理论，用于识别周期性压电复合材料的均匀化模量和局部机电场。该理论采用多网络模型来表示夹杂物和基体相中的应力平衡和静电偏微分方程的解，从而更准确地描述场变量。利用一系列周期已知、参数可调的正弦函数，有效地解决了六边形对称和立方对称的周期满足条件。此外，该理论对并置点应用了完全可训练的权值。这些可训练权值与神经网络权值同时训练，迫使神经网络在面对较大的局部应力/变形梯度时提高其性能。通过与单向纤维增强复合材料、球形颗粒增强复合材料或在大体积分数范围内被椭球腔削弱复合材料的有限元解进行比较，说明了所提出理论的预测能力。Composites Part B: EngineeringExperimental analysis of the forming behavior of uni- and bidirectional non-crimp fabrics for different geometriesBastian Schäfer, Ruochen Zheng, Julien Colmars, Auriane Platzer, Naim Naouar, Philippe Boisse, Luise Kärgerdoi:10.1016/j.compositesb.2024.111765不同几何形状单向和双向无卷曲织物成形行为的实验分析For efficient large-series production and improved process design, a profound understanding of a textile’s forming behavior is crucial to ensure adequate drapability and defect-free components. Woven fabrics have often been the focus of research due to their easier formability, while non-crimp fabrics (NCFs) have been investigated much less despite their higher lightweight potential, resulting in a limited experimental basis for the validation of numerical models. Therefore, forming experiments of a unidirectional and a bidirectional NCF are conducted for different configurations and punch shapes, including hemisphere, tetrahedron, and square box. The macroscopic strains are captured throughout the entire process using digital image correlation (DIC) and comprehensively analyzed in combination with the outer contour and resulting defects. Fundamental differences in the deformation behavior of both textiles are identified. For the balanced Biax-NCF, the tricot stitching couples the deformation of both fiber layers and the fabric mainly deforms under symmetrical shear with limited yarn slippage or defects. For the highly unbalanced UD-NCF, the lack of a second fiber direction results in an asymmetrical deformation behavior. The UD-NCF deforms due to shear parallel to the fiber yarns superimposed with transverse tensile and compressive strains in different deformation modes. The data generated in this study is freely available at https://doi.org/10.5281/zenodo.12516898.对于高效的大批量生产和改进的工艺设计，对纺织品成型行为的深刻理解对于确保足够的可垂性和无缺陷部件至关重要。机织织物由于其易于成型而成为研究的焦点，而无卷曲织物(nfc)尽管具有更高的轻量化潜力，但研究较少，导致数值模型验证的实验基础有限。因此，本文针对半球、四面体、方盒等不同构型和冲孔形状进行了单向和双向NCF的成形实验。采用数字图像相关(DIC)技术捕获整个过程的宏观应变，并结合外轮廓和产生的缺陷进行综合分析。确定了两种纺织品变形行为的根本差异。对于平衡型Biax-NCF，纬编针脚将两层纤维的变形耦合在一起，织物主要在对称剪切下变形，纱线滑移或疵点有限。对于高度不平衡的UD-NCF，缺乏第二纤维方向导致不对称变形行为。在不同的变形模式下，UD-NCF的变形是由于平行于纤维纱的剪切作用，并叠加了横向拉伸和压缩应变。本研究生成的数据可在https://doi.org/10.5281/zenodo.12516898免费获取。Self-adaptive bioactive scaffolds orchestrate diabetic microenvironment remodeling and vascularized bone regenerationYali Cai, Xin Sun, Qian Feng, Bing Li, Xiaojun Li, Shuo Chen, Xiaojun Zhou, Chuanglong Hedoi:10.1016/j.compositesb.2024.111771 自适应生物活性支架协调糖尿病微环境重塑和血管化骨再生The repair of diabetic bone defects is still challenging as the innate healing process is impaired by adverse microenvironments such as excessive reactive oxygen species (ROS) and insufficient angiogenesis and osteogenesis. Herein, a self-adaptive biocomposite scaffold that can orchestrate sequential regulation of diabetic microenvironment and vascularized bone regeneration was developed for efficient diabetic bone defect repair. The therapeutic scaffold system was meticulously constructed through the incorporation of hydrogel and 3D-printed architecture. In response to the multiple diabetic microenvironment (high level of glucose and ROS), the hydrogel consisting of Vitamin C-loaded phenylboric acid-grafted poly (glutamic acid)/poly(vinyl alcohol) showed adaptive degradation and antioxidative properties by scavenging the intracellular ROS, as well as promoting M2 polarization of macrophages. Furthermore, the copper-doped bioactive glass-contained 3D-printed polycaprolactone within the scaffold system was demonstrated to enhance the mechanical strength and stimulate the in vitro angiogenic and osteogenic performance by releasing copper and silicon ions. Moreover, in a diabetic rat femoral defect model, the biocomposite scaffold showed better angiogenesis and bone regeneration by following diabetic microenvironment remodeling. Therefore, the designed self-adaptive biocomposite scaffold can promote diabetic bone regeneration by sequentially regulating pathological and regenerative cues. This study offers vital insight into the design of a self-adaptive bioactive scaffold for the treatment of diabetic bone defects.糖尿病骨缺损的修复仍然具有挑战性，因为先天愈合过程受到不良微环境的损害，如过多的活性氧(ROS)和血管生成和成骨不足。本研究开发了一种自适应生物复合支架，该支架可以协调糖尿病微环境的顺序调节和血管化骨再生，用于有效的糖尿病骨缺损修复。治疗支架系统是通过结合水凝胶和3d打印结构精心构建的。针对糖尿病多发微环境(高水平葡萄糖和ROS)，负载维生素c的苯硼酸接枝聚谷氨酸/聚乙烯醇组成的水凝胶通过清除细胞内ROS表现出适应性降解和抗氧化特性，并促进巨噬细胞M2极化。此外，在支架系统中掺杂铜的含生物活性玻璃的3d打印聚己内酯被证明可以通过释放铜和硅离子来提高机械强度并刺 激体外血管生成和成骨性能。此外，在糖尿病大鼠股骨缺损模型中，生物复合材料支架在糖尿病微环境重塑后表现出更好的血管生成和骨再生。因此，设计的自适应生物复合支架可以通过顺序调节病理和再生信号来促进糖尿病骨再生。这项研究为设计一种自适应生物活性支架治疗糖尿病性骨缺损提供了重要的见解。来源：复合材料力学仿真Composites FEM