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Analyzing the Sound of Materials: Application of Acoustic Emission Technique for Monitoring Material Behavior 分析材料的声音:应用声发射技术监测材料行为
Pub Date : 2024-03-22 DOI: 10.4028/p-hk3qly
C. R. Ríos-Soberanis, Takenobu Sakai, S. Wakayama
During the last years, some concerns have arisen in relation to the outcome of mechanisms of failure in composite materials according to its mechanical behavior. Such interest resulted in the development of new complex structures in order to enhance its mechanical resistance and the controlling of damage processes. Nevertheless, it is imperative to understand the degree of mechanical performance that these materials can achieve when under external stresses. In this regard, applying Acoustic Emission (AE) technique is widely known as a very effective technology for identifying and monitoring damage progression on different kind of materials and structures providing valuable information. AE is a non-destructive technique (NDT) capable of detecting micro damage initiation and propagation along several types of failure modes such as reinforcement/matrix interfacial debonding, matrix cracking, delamination, fracture, etc. This paper examines applications of AE regarding to composite materials where fracture processes are generally more complex and data interpretation is correspondingly more difficult. Finally, in order to continuously improve the reliability of this technique, several researches have advanced its trustworthiness through innovations in AE technology. Some perspectives are discussed.
在过去的几年里,人们开始关注复合材料根据其机械行为所产生的破坏机制。这种关注导致了新型复合结构的开发,以增强其机械阻力并控制破坏过程。然而,当务之急是了解这些材料在外部应力作用下的机械性能。在这方面,应用声发射(AE)技术是众所周知的一种非常有效的技术,可以识别和监测不同类型材料和结构的损坏过程,并提供有价值的信息。声发射是一种非破坏性技术(NDT),能够检测微小损伤的发生和传播,以及几种类型的破坏模式,如加固/基体界面脱胶、基体开裂、分层、断裂等。本文探讨了 AE 在复合材料中的应用,复合材料的断裂过程通常更为复杂,数据解读也相应更为困难。最后,为了不断提高该技术的可靠性,一些研究通过 AE 技术的创新提高了其可信度。本文讨论了一些观点。
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引用次数: 0
Materials and Technologies of Textile Production 纺织品生产材料与技术
Pub Date : 2024-03-19 DOI: 10.4028/b-dh044z
Li Jing Wang
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引用次数: 0
Development of a Process to Continuously Mercerise Loose-Stock Cotton 开发连续丝光棉加工工艺
Pub Date : 2024-03-19 DOI: 10.4028/p-ph2mr9
Lyndon Arnold, R. Padhye
Cotton has traditionally been mercerised as hanks of yarn or as open-width fabrics, but commercial methods to mercerise loose stock directly after ginning have been limited. Arnold and Rippon [1,2] produced continuous lengths of fully mercerised sliver with increased fibre strength, enhanced dye-uptake, improved surface lustre, without fibre shrinkage. Not only did the method prevent shrinkage, but fibres could be stretched by as much as 4% and then stably set. The disadvantage of this method was that fibre had to be fully processed to sliver form.An improved prototype machine has now been successfully developed to continuously mercerise ginned loose stock. Testing has confirmed that the output fibres are mercerised along their full lengths and have higher tenacity compared with the un-mercerised Control. Fibre lengths have also been maintained, indicating that the shrinkage normally caused by slack mercerising has been prevented. Fibre dyeability is comparable with that of slack-mercerised samples but better than the un-mercerised Control. The improved lustre expected for fibre mercerised under tension has also been confirmed. The production rate of the process can be readily improved, and the prototype expanded in size to increase output.
传统上,棉花是作为纱束或开幅织物进行丝光处理的,但在轧棉后直接丝光处理散棉的商业方法非常有限。阿诺德和里彭[1,2]生产出了连续长度的全丝光棉条,纤维强度提高,吸染能力增强,表面光泽改善,且无纤维收缩。这种方法不仅能防止收缩,还能将纤维拉伸多达 4%,然后稳定定型。这种方法的缺点是纤维必须完全加工成棉条状。现在,我们已成功开发出一种改进型原型机,可对轧花散浆进行连续丝光处理。测试结果表明,产出的纤维全长都经过丝光处理,与未丝光处理的对照组相比,韧性更高。纤维长度也得到了保持,这表明丝光松弛通常会导致的收缩已被避免。纤维的染色性与松弛丝光处理的样品相当,但优于未丝光处理的对照组。在张力下丝光处理的纤维的光泽也得到了改善。该工艺的生产率可随时提高,原型的尺寸也可扩大,以增加产量。
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引用次数: 0
Ag Doping and rGO Coupling of TiO2 within Polysiloxane Matrix for the Ecofriendly Development of High-Performance Cotton Fabric 聚硅氧烷基质中二氧化钛的银掺杂和 rGO 耦合用于高性能棉织物的生态友好开发
Pub Date : 2024-03-19 DOI: 10.4028/p-r24xao
Mohammad Mamunur Rashid, M. Zorc, B. Simončič, Ivan Jerman, B. Tomšič
In this work, TiO2 was applied to cotton fabric by a sol–gel-hydrothermal process. A combination of 3-(trihydroxysilyl) propyl methylphosphonate monosodium salt solution (TPMP) and (3-aminopropyl)triethoxysilane (APTES) was used as a matrix to enhance the interfacial interaction between TiO2 and surface of the cotton fibres. During the hydrothermal treatment, silver nitrate (AgNO3) or reduced graphene oxide (rGO) were added to produce Ag-doped TiO2- or rGO-coupled TiO2-coated textiles. The successful application of all investigated components on cotton fabric was confirmed by the analysis of SEM and EDS. The results of UPF determination and self-cleaning activity showed excellent performance of both studied nanocomposite coatings, whereas the use of rGO proved to be better than Ag.
在这项工作中,采用溶胶-凝胶-水热工艺将二氧化钛应用于棉织物。3-(三羟基硅基)丙基甲基膦酸单钠盐溶液(TPMP)和(3-氨丙基)三乙氧基硅烷(APTES)被用作基质,以增强 TiO2 与棉纤维表面的界面相互作用。在水热处理过程中,加入硝酸银(AgNO3)或还原氧化石墨烯(rGO),制备出掺银 TiO2 或 rGO 耦合 TiO2 涂层纺织品。扫描电子显微镜(SEM)和电致发光(EDS)分析证实了所有研究成分在棉织物上的成功应用。UPF测定和自清洁活性的结果表明,所研究的两种纳米复合涂层都具有优异的性能,而使用rGO的效果优于Ag。
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引用次数: 0
Computational Evaluation of Weaving Process on Mechanical Stiffness of Plain Weave Fabric 织造工艺对平纹织物机械刚度的计算评估
Pub Date : 2024-03-19 DOI: 10.4028/p-7qdn38
Yue Zhang, Hikaru Miyaki, Jianliang Zhang, Atsushi Sakuma
Inherent structural stress in a plain weave is induced during the formation process of fabrics, and its evaluation is useful for estimating the mechanical stiffness of weaves. In this study, the effect of inherent stress distributed in a weave fabric was investigated to estimate its mechanical stiffness. Here, a numerical simulation method that imitates the fabrication process of fabrics is proposed to evaluate stiffness. A diagram illustrating the weaving process is defined in this evaluation method. For computational analysis, a unit cell model used in homogenization was developed based on the structural periodicity of the plain weave structure using the finite element method. The weaving state was accomplished by simulating the weaving behavior in this model. The weaving state included the geometric shape and stress/strain data. Subsequently, a model was built to estimate the mechanical stiffness based on the weaving state data. Finally, a uniaxial tensile simulation was conducted using the numerical model. Using this evaluation method, the effect of inherent stress on the mechanical stiffness of weaves was quantified, which indicated that the tensile stiffness improved in a small strain range. The effect gradually decreased as the tension progressed.
平纹织物中的固有结构应力是在织物形成过程中产生的,对其进行评估有助于估算织物的机械刚度。在本研究中,研究了平纹织物中分布的固有应力对估算其机械刚度的影响。在此,我们提出了一种模仿织物编织过程的数值模拟方法来评估刚度。该评估方法定义了一个说明编织过程的图表。在计算分析中,根据平纹织物结构的周期性,使用有限元方法建立了用于均质化的单元格模型。织造状态是通过模拟该模型中的织造行为来实现的。织造状态包括几何形状和应力/应变数据。随后,根据编织状态数据建立了一个模型来估算机械刚度。最后,利用数值模型进行了单轴拉伸模拟。通过这种评估方法,量化了固有应力对织物机械刚度的影响。随着张力的增加,这种影响逐渐减弱。
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引用次数: 0
Novel Knit Structure with Adjustable Tensile Behaviour Based on Combined Weft/Warp Technology 基于纬纱/经纱组合技术的拉伸性能可调的新型针织结构
Pub Date : 2024-03-19 DOI: 10.4028/p-pzvte0
Sven Hellmann, Carmen Sachse, E. Häntzsche, C. Cherif
Weft-knitted fabrics are used in a wide range of applications. The tensile behaviour, the geometric diversity and the materials to be used are essential structural parameters that are also economically important. To improve this behaviour, the new approach is to integrate warp-stitch threads into a weft-knitted fabric using conventional weft-knitting machine technology, thus significantly increasing the range of binding possibilities for the adjustment of elasticity in wale direction. The characteristics that can be achieved in this way open up new areas of application, for example in compression textiles.
纬编织物应用广泛。拉伸性能、几何多样性和使用的材料是重要的结构参数,同时也具有重要的经济意义。为了改善这种性能,新的方法是使用传统的纬编机技术将经线缝合到纬编织物中,从而大大增加了调整经向弹性的缝合范围。通过这种方法可以实现的特性开辟了新的应用领域,例如压缩纺织品。
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引用次数: 0
Silica-Containing Phosphorus-Based Sol-Gel Finishing to Improve Flame Retardant Performance of Cotton Fabrics 含硅的磷基溶胶-凝胶整理改善棉织物的阻燃性能
Pub Date : 2024-03-19 DOI: 10.4028/p-usqr8l
V. Trovato, Giuseppina Iacono, G. Malucelli, G. Rosace
In this paper, the sol-gel technique was used to design hybrid phosphorus-doped silica structures for improving the thermal stability and flame retardancy of cotton fabrics. To this aim, diethylphosphatoethyltriethoxysilane (DPTS) was employed as phosphate alkoxysilane in a multistep procedure that involved multiple layers (from 1 to 6) depositions. The multi-layer coatings were applied by padding using sols containing appropriate molar ratios of the precursor, anhydrous ethanol, catalyst, and hydrochloric acid. Moreover, the synergism P-N on flame retardancy of cotton was assessed by introducing 3-aminopropyltriethoxysilane (APTES) as an N-donor precursor in DPTS sols. The effects of the catalyst during the alkoxide reaction and the silica amount applied by sol-gel treatment on the thermo-oxidative behavior of the treated fabrics were deeply studied. The creation of the silica skeleton on the cotton surface and the interactions between the cellulosic fibres and the doped layer were investigated using FT-IR ATR spectroscopy. Moreover, thermal and thermo-oxidative stability, flammability properties, and combustion behavior of the sol-gel treated cotton fabrics were also studied, proving the effectiveness of the sol-gel coating in the fire protection of the cellulosic substrate.
本文利用溶胶-凝胶技术设计了掺磷混合二氧化硅结构,以提高棉织物的热稳定性和阻燃性。为此,采用了二乙基磷乙基三乙氧基硅烷(DPTS)作为磷酸烷氧基硅烷,通过多步程序进行多层(1 至 6 层)沉积。多层涂层是使用含有适当摩尔比的前驱体、无水乙醇、催化剂和盐酸的溶胶进行研磨的。此外,还通过在 DPTS 溶剂中引入 3-aminopropyltriethoxysilane (APTES) 作为 N-供体前体,评估了 P-N 对棉花阻燃性的协同作用。深入研究了烷氧基反应过程中的催化剂和溶胶-凝胶处理中的二氧化硅用量对处理后织物热氧化行为的影响。使用 FT-IR ATR 光谱法研究了棉表面二氧化硅骨架的形成以及纤维素纤维与掺杂层之间的相互作用。此外,还研究了经溶胶-凝胶处理的棉织物的热氧化稳定性、可燃性和燃烧行为,证明了溶胶-凝胶涂层在纤维素基材防火方面的有效性。
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引用次数: 0
Micromechanical Modelling of the Deformation Mechanisms Friction-Spun Yarn from Recycled Carbon Fibres 再生碳纤维摩擦纺纱变形机理的微观力学建模
Pub Date : 2024-03-19 DOI: 10.4028/p-atiih0
Tobias Georg Lang, Mmb Hasan, A. Abdkader, C. Cherif, T. Gereke
The growing use of carbon fibre-reinforced polymers (CFRP) results in an increased amount of CF waste from offcuts or end-of-life components. A promising method to reuse the waste fibre materials in a structural component with excellent mechanical properties is the processing of recycled CF (rCF) and thermoplastic fibres into hybrid yarns. Spinning of friction spun yarns consisting of more than 90% rCF and containing almost no thermoplastic fibres that are suitable for thermoset composites, currently leads to high fibre damage and low yarn quality and is, therefore, addressed in this project. The technology is reported in another paper. One of the limiting factors for drapability of textiles is the stretchability of continuous fibres and draping of the semi-finished textile products for complex geometries is still error-prone. Friction spun yarns exhibit significantly higher yarn elongations due to sliding mechanisms between the fibres. The deformation properties of friction spun yarns are significantly influenced by fibre-fibre interactions and depend on a variety of process and material parameters. In the following, micromechanical finite element models of the spun yarns are created by using beam elements. Monte Carlo method is used to model local variabilities in the yarns. The models are then used to simulate yarn behaviour under deformation and to investigate the influence of various process parameters.
随着碳纤维增强聚合物(CFRP)的使用日益增多,从下脚料或报废部件中产生的碳纤维废料也越来越多。将回收的碳纤维(rCF)和热塑性纤维加工成混合纱线,是在具有优异机械性能的结构部件中重复使用废纤维材料的一种可行方法。目前,由 90% 以上的 rCF 组成的摩擦纺纱几乎不含适用于热固性复合材料的热塑性纤维,这种纺纱会导致纤维损坏率高、纱线质量低,因此本项目将解决这一问题。有关该技术的报告见另一篇论文。纺织品悬垂性的限制因素之一是连续纤维的伸展性,而且复杂几何形状的半成品纺织品的悬垂性仍然容易出错。由于纤维之间的滑动机制,摩擦纺纱的纱线伸长率明显更高。摩擦纺纱的变形特性受到纤维间相互作用的显著影响,并取决于各种工艺和材料参数。下文将使用梁元素创建纺纱的微机械有限元模型。蒙特卡洛法用于模拟纱线的局部变化。然后使用这些模型模拟纱线在变形时的行为,并研究各种工艺参数的影响。
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引用次数: 0
Analysis of the Influence of Fiber Orientations in Carbon Fiber Reinforced Composites on their Structural Properties Based on Eddy Current Measurements 基于涡流测量的碳纤维增强复合材料中纤维方向对其结构特性的影响分析
Pub Date : 2024-03-19 DOI: 10.4028/p-euwyi2
Johannes Mersch, T. Gereke, A. Nocke, C. Cherif
Fiber-reinforced plastics (FRP) are a type of composite material consisting of a reinforcing structure and a plastic matrix. When compared to traditional construction materials, FRP has higher strength and stiffness due to the high mechanical properties of reinforcing fibers such as carbon or glass. However, the properties of FRP are dependent on the alignment of fibers within the composite, with deviations leading to reduced strength and stiffness. Eddy current testing is a non-destructive technique used to visualize carbon fibers in the composite and assess the impact of local fiber orientation on the structural properties of FRP. This study aims to understand the influence of local fiber orientation on tensile strength and elastic modulus by producing composites with defined fiber orientations, analyzing them with eddy current testing, and assessing their mechanical properties through tensile tests. The measured fiber orientations are then used to validate a finite element model, in which the actual, measured fiber orientation is applied to the simulation and correlated with the mechanical properties. In contrast to previous published studies measured fiber orientation is used, which as shown in this work, differs from the theoretically implemented fiber orientation.
纤维增强塑料(FRP)是一种由增强结构和塑料基体组成的复合材料。与传统建筑材料相比,由于碳或玻璃等增强纤维具有较高的机械性能,玻璃纤维增强塑料具有更高的强度和刚度。然而,玻璃钢的性能取决于复合材料中纤维的排列,如果出现偏差,强度和刚度就会降低。涡流测试是一种非破坏性技术,用于观察复合材料中的碳纤维,并评估局部纤维取向对玻璃钢结构性能的影响。本研究旨在通过生产具有确定纤维取向的复合材料,利用涡流测试对其进行分析,并通过拉伸试验评估其机械性能,从而了解局部纤维取向对拉伸强度和弹性模量的影响。测得的纤维取向随后被用于验证有限元模型,其中实际测得的纤维取向被应用到模拟中,并与机械性能相关联。与以往已发表的研究不同的是,本研究采用的是实测纤维取向,如本研究所示,它与理论上实现的纤维取向不同。
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引用次数: 0
Characterization of Nanoporous Poly(Lactic Acid) Microfibers Using a Simplified Centrifugal Spinning Method 用简化离心纺丝法表征纳米多孔聚(乳酸)微纤维
Pub Date : 2024-03-19 DOI: 10.4028/p-fho6e7
Kazushi Yamada, C. Narita
In recent years, great attention has been paid to the development of porous materials with excellent reactivity and absorbency. The poly(lactic acid) (PLA) microfibers with uniform nanopores were successfully prepared by rotary centrifugal spinning using PLA/chloroform solution. Previous research showed that PLA microfibers have extremely high oil absorbing capacity. In this study, the changes in fiber diameter and nanopore diameter of nanoporous PLA microfibers under different fabrication conditions and the adsorption capacity of Prussian blue nanoparticles were systematically evaluated. The results showed that the fiber diameter increased with increasing PLA/chloroform solution concentration. Furthermore, it was found that the amount of adsorbed Prussian blue nanoparticles increased with the increase in fiber diameter. Prussian blue nanoparticles are known to adsorb radioactive materials such as cesium, and are expected to be applied to the recovery of cesium diffused in the atmosphere and ocean.
近年来,人们对具有优异反应性和吸附性的多孔材料的开发给予了极大关注。利用聚乳酸/氯仿溶液,通过旋转离心纺丝法成功制备了具有均匀纳米孔的聚乳酸(PLA)微纤维。以往的研究表明,聚乳酸微纤维具有极高的吸油能力。本研究系统评价了不同制备条件下纳米多孔聚乳酸微纤维的纤维直径和纳米孔径的变化以及对普鲁士蓝纳米颗粒的吸附能力。结果表明,纤维直径随聚乳酸/氯仿溶液浓度的增加而增大。此外,还发现吸附的普鲁士蓝纳米粒子的数量随着纤维直径的增加而增加。众所周知,普鲁士蓝纳米粒子可吸附铯等放射性物质,有望应用于大气和海洋中扩散的铯的回收。
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引用次数: 0
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