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【新文速递】2023年11月17日复合材料SCI期刊最新文章

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今日更新:Composites Part B: Engineering 1 篇

Composites Part B: Engineering

Unleashing the power of SAN: Innovative in situ fibrillation and moisture-crosslinking techniques yield stronger, tougher, and Greener material than ABS

Monfared Ali Reza, Rezaei Sasan, Rahman Saadman Sakib, Nakamura Yu, Zaoui Aniss, Omranpour Hosseinali, Lee Patrick C., Park Chul B.

doi:10.1016/j.compositesb.2023.111103

 

释放 SAN 的力量:创新的原位纤维化和水分交联技术产生了比 ABS 更强、更韧、更环保的材料

Styrene-acrylonitrile (SAN) is widely used in various applications due to its excellent properties, including thermal stability, dimensional stability, and chemical resistance. However, poor toughness has limited its applications. In this study, an innovative in-situ fibrillation technique was employed to create nanofibers of thermoplastic polyurethane (TPU) in the SAN matrix. Silane was initially grafted onto TPU, followed by the development of nanofibril TPU, and lastly, post-crosslinking was conducted to retain the nanofibril structure. The grafting reaction was analyzed using Fourier Transform Infrared Spectroscopy (FTIR) and Proton Nuclear Magnetic Resonance Spectroscopy (1H NMR). FTIR and NMR data were used in conjunction with the gel content test to confirm the involved grafting, hydrolysis, and crosslinking reactions. Observations with a Scanning Electron Microscope (SEM) revealed the formation of nanoscale TPU fibers ranging from 90 to 360 nm for various TPU contents. Because of nanofibril TPU's high aspect ratio and the effective SAN-TPU interaction, the required TPU decreased to 1 wt%. Due to the minimal use of rubber, SAN's stiffness was not compromised and compared to pure SAN and a spherical structure with the same concentration, tensile toughness increased by 350% and 200%, respectively. The fracture mechanism was investigated for both the short and long timeframes of deformation, and several potential hypotheses were proposed. Finally, this novel toughened SAN was compared with one of the most effective toughened acrylonitrile butadiene styrene (ABS) materials that contain 40 wt% spherical butadiene rubber (BR) domains.

苯乙烯-丙烯腈(SAN)具有热稳定性、尺寸稳定性和耐化学性等优良特性,因此被广泛应用于各种领域。然而,较差的韧性限制了它的应用。在本研究中,采用了一种创新的原位纤维化技术,在 SAN 基体中生成热塑性聚氨酯(TPU)纳米纤维。首先在热塑性聚氨酯上接枝硅烷,然后形成纳米纤维热塑性聚氨酯,最后进行后交联以保留纳米纤维结构。接枝反应采用傅立叶变换红外光谱(FTIR)和质子核磁共振光谱(1H NMR)进行分析。傅立叶变换红外光谱和核磁共振数据与凝胶含量测试结合使用,以确认所涉及的接枝、水解和交联反应。扫描电子显微镜(SEM)的观察结果表明,在不同的热塑性聚氨酯含量下,形成的纳米级热塑性聚氨酯纤维从 90 纳米到 360 纳米不等。由于纳米纤维热塑性聚氨酯的高纵横比和 SAN-TPU 的有效相互作用,所需的热塑性聚氨酯降至 1 wt%。与纯 SAN 和相同浓度的球形结构相比,拉伸韧性分别提高了 350% 和 200%。研究人员对短时间和长时间变形的断裂机制进行了研究,并提出了几种可能的假设。最后,将这种新型增韧 SAN 与含有 40 wt% 球形丁二烯橡胶 (BR) 域的最有效增韧丙烯腈-丁二烯-苯乙烯 (ABS) 材料进行了比较。



来源:复合材料力学仿真Composites FEM
ACTMAGNETDeform断裂复合材料化学电子UG材料Fourier Transform
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首次发布时间:2024-11-03
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【新文速递】2023年11月4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 Science and Technology 1 篇Composite StructuresHole quality improvement in CFRP/Ti6Al4V stacks using optimised flow rates for LCO2 and MQL sustainable cooling/lubricationRodriguez I., Arrazola P.J., Cuesta M., Pušavec F.doi:10.1016/j.compstruct.2023.117687利用 LCO2 和 MQL 可持续冷却/润滑的优化流速提高 CFRP/Ti6Al4V 叠层的孔质量Carbon fibre reinforced polymer/titanium stacks (CFRP/Ti6Al4V) are employed in aeronautics due to their excellent weight-to-strength ratio and corrosion properties. However, these same material properties present challenges for hole making which cannot be solved using conventional water-based metalworking fluids (MWFs), as they cause degradation of the composite. Moreover, environmental and health concerns require exploration of alternative cooling/lubrication solutions. In this study, a controlled mixture of liquid carbon dioxide (LCO2) and minimum quantity lubrication (MQL) was supplied through the drilling tool. The effect of varying LCO2 and MQL flow rates was evaluated on cutting forces, temperatures, and several hole quality outputs. The optimal flow rates were then determined through multi-objective optimisation. The results show that the cooling/lubrication flow rate greatly affects the measured outputs, and that supplying LCO2+MQL with optimised flow rates helps achieve superior quality holes in CFRP, Ti6Al4V and CFRP/Ti6Al4V stacks.碳纤维增强聚合物/钛复合材料(CFRP/Ti6Al4V)因其优异的重量强度比和耐腐蚀性能而被广泛应用于航空领域。然而,这些材料特性也给孔加工带来了挑战,传统的水基金属加工液(MWF)无法解决这些问题,因为它们会导致复合材料降解。此外,出于对环境和健康的考虑,需要探索其他冷却/润滑解决方案。在这项研究中,受控的液态二氧化碳(LCO2)和最小量润滑油(MQL)混合物通过钻具供应。评估了不同的 LCO2 和 MQL 流速对切削力、温度和几种孔质量输出的影响。然后通过多目标优化确定了最佳流速。结果表明,冷却/润滑流速对测量结果有很大影响,以优化流速提供 LCO2+MQL 有助于在 CFRP、Ti6Al4V 和 CFRP/Ti6Al4V 叠层中获得优质孔。Composites Part A: Applied Science and ManufacturingExperimental Characterization of Compression Failure Mechanism Initiation and Growth in Notched Carbon Fiber Reinforced Composite SpecimensClay Stephen, Ault Wesley, Faupel Alex, Oskay Caglar, Knoth Philip, Shemesh Noam N.Y., Haj-Ali Rami, Breiman Uri, Meshi Ido, Shor Ofirdoi:10.1016/j.compositesa.2023.107865缺口碳纤维增强复合材料试样压缩失效机理起始和增长的实验表征This paper describes an experimental investigation to evaluate the compression failure mechanisms of kink banding, splitting, and delaminations under non-standard quasi-static loading of laminated carbon fiber reinforced composites. Tests were performed on double-edge notch compression (DENC) specimens to observe microscopic compressive damage initiation and progression. Acoustic emission results from specimens loaded to failure were used to define ranges of static stress associated with different forms of damage. Subsequent tests were interrupted at these stress intervals and results obtained from multiple inspection techniques provide quantified characterization of failure mechanism initiation and growth as a function of applied load level. Optical images of the exterior surfaces, micrographs of the laminate thickness generated via a grind/polish procedure, and postmortem X-ray computed tomographs provide detailed information on the 3D morphology and evolution of failure mechanisms in the laminate. Key failure characteristics include interior kink bands, surface ply splitting, and delaminations at two different types of interfaces. Kink bands are only present near ultimate failure while splitting and delamination initiate at approximately 50% lower stress levels. The experimental observations provide insight into the critical and subcritical nature of these failure mechanisms and their possible interactions in a multidirectional laminate under compression loading.本文介绍了一项实验研究,旨在评估层状碳纤维增强复合材料在非标准准静态加载条件下的压缩破坏机制,包括扭结带、劈裂和分层。测试在双刃缺口压缩(DENC)试样上进行,以观察微观压缩损伤的发生和发展。加载至破坏的试样的声发射结果被用来定义与不同形式的损坏相关的静态应力范围。随后的测试在这些应力区间内中断,多种检测技术得出的结果提供了失效机制开始和发展的量化特征,与施加的载荷水平成函数关系。外表面的光学图像、通过研磨/抛光程序生成的层压板厚度显微照片以及死后 X 射线计算机断层扫描图提供了有关层压板三维形态和失效机制演变的详细信息。主要的失效特征包括内部扭结带、表面层裂和两种不同类型界面的脱层。扭结带仅在接近极限失效时出现,而分裂和分层则在应力水平降低约 50%时开始。通过实验观察,我们可以深入了解这些失效机制的临界和次临界性质,以及它们在压缩荷载下的多向层压板中可能产生的相互作用。Composites Science and TechnologyA novel pultrusion method and axial compression behavior of 3-D braiding-winding-pultrusion composite tubes at different temperaturesLiu Xi, Shen Wei, Fu Jincun, Natsuki Toshiaki, Zhu Lvtaodoi:10.1016/j.compscitech.2023.110340 新型拉挤方法和三维编织-缠绕-拉挤复合管在不同温度下的轴向压缩行为The 3-D carbon fiber reinforced resin matrix composite tubes were designed and formed via a type of novel braiding-winding-pultrusion processing technique. The effects of temperature environments (lower, normal and high temperature) on the axial compressive mechanical responses and damage behaviors of novel 3-D braiding-winding-pultrusion composite (BWPC) tubes were investigated. It was found that the BWPC tubes combined with three forming process features has a complex compression failure mode. The CT image was show that the fiber damage methods of braiding, winding and pultrusion layer were different, and the structural design of the tubes directly affects the axial bearing capacity. The axial quasi-static compression failures of tubes were the flowering failure of petals at one end. The fiber fracture and fiber block falling off was more apparent when under the lower temperature environment. The research also indicated that, when the temperature exceeds 180 °C, the resin softening and stratification will be destroyed.通过一种新型编织-缠绕-拉挤加工技术,设计并形成了三维碳纤维增强树脂基复合材料管。研究了温度环境(低温、常温和高温)对新型三维编织-缠绕-拉挤复合材料(BWPC)管轴向压缩力学响应和损伤行为的影响。研究发现,具有三种成型工艺特征的 BWPC 管具有复杂的压缩失效模式。CT 图像显示,编织层、缠绕层和拉挤层的纤维破坏方式不同,管材的结构设计直接影响其轴向承载能力。管材的轴向准静压失效为一端花瓣的开花失效。在较低温度环境下,纤维断裂和纤维块脱落现象更为明显。研究还表明,当温度超过 180 ℃ 时,树脂软化和分层将被破坏。来源:复合材料力学仿真Composites FEM

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