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Impact of sand feed rate on the damage of railway wheel steels 给砂率对铁路车轮钢损伤的影响
Pub Date : 2024-05-01 DOI: 10.1088/1757-899x/1306/1/012036
N Zani, K Shu, L Ghidini, C Petrogalli, A Mazzù
The global railway industry plays a pivotal role in economic development, offering efficient transportation solutions. However, railways operating in desert environments face unique challenges due to windblown sand. This study investigates the influence of sand feed rates on wheel-rail wear in desert conditions. Experimental tests were conducted using a bidisc apparatus to simulate sand feed rates. Results indicate that low feed rates lead to spalling and pitting, while high rates increase abrasive and fatigue wear. A critical transition point at 0.4 g/min suggests sand-induced abrasion of wheel surfaces. Moreover, the research highlights the crucial role of sand feed rates not only in wear but also in surface roughness, further emphasizing the complex interplay between sand transport rates, adhesion, and wear mechanisms. These insights provide valuable guidance for mitigating wear-related challenges in desert railway operations and optimizing maintenance strategies.
全球铁路行业在经济发展中发挥着举足轻重的作用,提供高效的运输解决方案。然而,在沙漠环境中运行的铁路却面临着风沙带来的独特挑战。本研究探讨了沙漠条件下进沙量对轮轨磨损的影响。实验测试使用双盘设备模拟进沙率。结果表明,低进给率会导致剥落和点蚀,而高进给率则会增加磨料磨损和疲劳磨损。0.4 g/min 时的临界过渡点表明砂粒会导致砂轮表面磨损。此外,研究还强调了进砂率不仅对磨损,而且对表面粗糙度的关键作用,进一步强调了砂输送率、附着力和磨损机制之间复杂的相互作用。这些见解为减轻沙漠铁路运营中与磨损相关的挑战和优化维护策略提供了宝贵的指导。
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引用次数: 0
Ultimate Tensile Strengths and Elastic Moduli at 20 K of Additively Manufactured PA840-GSL, A6061-RAM2, and AlSi10Mg 加成法制造的 PA840-GSL、A6061-RAM2 和 AlSi10Mg 在 20 K 时的极限拉伸强度和弹性模量
Pub Date : 2024-05-01 DOI: 10.1088/1757-899x/1302/1/012006
R Adams, G Rinauro, J Leachman
The additive manufacturing (AM) of polymer matrix composites (PMCs) and metal matrix composites (MMC) systems presents novel opportunities for reducing the mass of aerospace vehicles. These solutions also have the potential to reduce the cost of terrestrial applications where cryogenic temperatures are present. To address this need, this paper explores the mechanical characterization of three AM materials at 20 K: a nylon-based PMC PA840-GSL, and two aluminum-based MMCs A6061-RAM2 and AlSi10Mg. A Cryogenic Accelerated Fatigue Tester (CRAFT) used for the mechanical testing is first detailed. Next, ultimate tensile strengths and elastic moduli of the additively manufactured AlSi10Mg alloy and A6061-RAM2 are obtained. Third, the mechanical performance of an additively manufactured PMC liquid hydrogen tank constituent is collected in addition to an analysis on the effect the processing parameters, such as scan spacing, have on the mechanical behavior. A6061-RAM2 exhibited superior mechanical performance and is recommended for structural applications. Variation of PA840-GSL scan spacing resulted in decreased mechanical performance.
聚合物基复合材料(PMC)和金属基复合材料(MMC)系统的增材制造(AM)为降低航空航天飞行器的质量提供了新的机遇。这些解决方案还有可能降低低温地面应用的成本。为了满足这一需求,本文探讨了三种 AM 材料在 20 K 温度下的机械特性:尼龙基 PMC PA840-GSL,以及两种铝基 MMC A6061-RAM2 和 AlSi10Mg。首先详细介绍了用于机械测试的低温加速疲劳试验机(CRAFT)。其次,得出了添加制造的 AlSi10Mg 合金和 A6061-RAM2 的极限拉伸强度和弹性模量。第三,除了分析扫描间距等加工参数对机械性能的影响外,还收集了添加制造的 PMC 液氢罐成分的机械性能。A6061-RAM2 表现出优异的机械性能,建议用于结构应用。PA840-GSL 扫描间距的变化导致机械性能下降。
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引用次数: 0
Oxidized structure and Compositional properties of 1144 phase FBS by analytical electron microscopy 利用分析电子显微镜观察 1144 相 FBS 的氧化结构和成分特性
Pub Date : 2024-05-01 DOI: 10.1088/1757-899x/1302/1/012035
Z-H Sung, A Masi, JY Lee, A Duchenko, X Hu, A G Kim, G Celentano
The 1144 phase (Ae1A1Fe4As4) shows a strong advantage of engineering fabrication among Fe (Iron)-based superconductor (FBS) family due to the robustness of its superconducting properties with respect to chemical inhomogeneities, granted by its uniform crystalline-layered structure. This regularity is furthermore associated to crystalline defects capable of acting as efficient pinning centers, from which high critical currents can achieved at high fields. Like other FBS phases, its lossless current-carrying capability can be remarkably degraded by distractions at grain boundaries (GBs). GB oxidation is an issue of upmost importance to the realization of the practical FBS application for high field (> 20T) magnet. In this study, we explore oxidized grain boundary and intrinsic grain structural properties of 1144 polycrystalline samples by applying analytical electron microscopy such as atomic resolution scanning transmission electron microscopy and atom probe tomography. These structural properties of samples produced by a mechanochemically assisted synthesis are evaluated following the degradation of superconducting properties due to oxidation. We observe a strong correlation between the contamination at grain boundaries and the decrease of transport properties of the bulk sample, while the crystallin structure seems to be not affected by the oxidation.
1144 相(Ae1A1Fe4As4)在铁(铁)基超导体(FBS)家族中显示出强大的工程制造优势,因为其均匀的晶体层状结构使其超导特性不受化学不均匀性的影响。此外,这种规则性还与晶体缺陷有关,晶体缺陷可作为有效的钉扎中心,在高磁场下可产生高临界电流。与其他 FBS 相一样,它的无损载流能力也会因晶界(GB)的干扰而明显降低。晶界氧化是实现高磁场(> 20T)磁体实际应用 FBS 的一个最重要问题。在这项研究中,我们应用分析电子显微镜,如原子分辨率扫描透射电子显微镜和原子探针断层扫描,探索了 1144 多晶样品的氧化晶界和内在晶粒结构特性。在氧化导致超导性能退化之后,我们对机械化学辅助合成样品的这些结构特性进行了评估。我们观察到,晶界污染与块状样品传输特性的下降之间存在很强的相关性,而晶体结构似乎不受氧化的影响。
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引用次数: 0
Airplane motors employing superconducting DC field windings and conventional conductor AC windings 采用超导直流场绕组和传统导体交流绕组的飞机发动机
Pub Date : 2024-05-01 DOI: 10.1088/1757-899x/1302/1/012017
S S Kalsi, J G Storey, G Lumsden, R A Badcock
Many organizations are developing compact lightweight highly efficient rotating machines for airplane applications. These machines include permanent magnets for excitation and an iron-core with and without superconducting windings. Air-core (no magnetic iron) machines have the potential to be the most lightweight and efficient. Such machines can use superconductors for both DC excitation field coils and AC armature coils, which need conductors under development, like MgB2 and Bi2212. If liquid-hydrogen (LH2) is available on a plane and can be used as a coolant, it becomes feasible to develop machines with AC armature coils made from conventional conductors like copper, aluminium, and high-conductivity aluminium.This paper describes conceptual designs for a 3 MW, 4,500 RPM motor employing REBCO CORC conductor for the DC field coils and conventional conductor Litz cable for the AC armature coils cooled by LH2 available on the plane. Both rotor and stator coils are contained in separate cryostats. The DC excitation coils on the rotor are operated at 40 K to work successfully with a brushless flux pump exciter. Likewise, stator AC coils are cooled with available LH2 to take advantage of the lower resistivity of conventional conductors at cryogenic temperatures. Motor size, mass and losses are compared for stator windings employing copper, aluminium, and high-conductivity aluminium (Hyper-Al). Compared with copper and aluminium machines, the machine employing Hyper-Al has smaller size, mass and total losses.
许多机构都在为飞机应用开发结构紧凑、重量轻的高效旋转机器。这些机器包括用于励磁的永久磁铁和带或不带超导绕组的铁芯。空芯(无磁铁)机器有可能成为最轻便、最高效的机器。这种机器可以在直流励磁磁场线圈和交流电枢线圈中使用超导体,这需要正在开发的导体,如 MgB2 和 Bi2212。如果飞机上有液氢 (LH2) 并可用作冷却剂,那么就可以开发使用传统导体(如铜、铝和高导电率铝)制成的交流电枢线圈的机器。本文介绍了一种 3 兆瓦、转速为 4,500 RPM 的电机的概念设计,该电机的直流励磁磁场线圈使用 REBCO CORC 导体,交流电枢线圈使用传统导体 Litz 电缆,由飞机上的 LH2 冷却。转子和定子线圈都装在单独的低温恒温器中。转子上的直流励磁线圈在 40 K 的温度下运行,以便与无刷磁通泵励磁机成功配合。同样,定子交流线圈使用可用的 LH2 进行冷却,以利用传统导体在低温下电阻率较低的优势。比较了采用铜、铝和高导电率铝(Hyper-Al)定子绕组的电机尺寸、质量和损耗。与铜制和铝制机器相比,采用 Hyper-Al 的机器在尺寸、质量和总损耗方面都更小。
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引用次数: 0
Thermal conductivity and mechanical properties of polymeric aerogels for cryogenic insulation applications 用于低温绝热应用的聚合物气凝胶的导热性和机械性能
Pub Date : 2024-05-01 DOI: 10.1088/1757-899x/1302/1/012007
G Churu, J A Demko, K Kimminau, D Lantz, H McGuire, G Van der Weil, M Field, S Malakooti, S L Vivod
Non-vacuum insulation systems are frequently applied in the thermal management of low temperature systems as well as for the use and storage of cryogens. Aerogels are known for their low density, high mesoporosity, high surface areas, low thermal conductivity and high acoustic impedance. This study focuses on polymeric aerogels that can be mass produced as large monoliths while maintaining the low thermal conductivity over a wide temperature range. The manufacturing flexibility of polymeric aerogels allows fabrication of monolithic blocks and sheets that can be applied in various configurations to insulate cryogenic and superconducting devices. To measure the thermal conductivity, an immersion calorimeter was developed and has been operated at different cold boundary temperatures. The calorimeter heats a hollow cylinder of insulating material on the inside surface and the surrounding bath maintains a cold boundary. This calorimeter was used to measure the thermal conductivity of commercially available FoamGlass and a hollow cylinder of a polymeric aerogel machined from a cast cylinder. The thermal conductivity of the FoamGlass and the polymeric aerogel are compared at room temperature (290 K), ice bath (273 K), and at liquid nitrogen (80 K) cold boundary temperatures. Room temperature measurements of the modulus of elasticity and yield strength using an optical technique are also reported for flat specimens of the aerogel made from the same stock as the cylindrical specimens tested for thermal conductivity. Mechanical properties of aerogels are also reported under compression and both at room temperature and at cryogenic temperature (Liquid nitrogen).
非真空隔热系统经常用于低温系统的热管理以及低温物质的使用和储存。气凝胶以其低密度、高介孔度、高表面积、低导热性和高声阻抗而著称。本研究的重点是聚合气凝胶,这种气凝胶可作为大型单体进行批量生产,同时在较宽的温度范围内保持较低的热导率。聚合物气凝胶的制造灵活性使其可以制成单片块体和薄片,以各种配置应用于低温和超导设备的绝缘。为了测量热导率,开发了一种浸入式量热计,并在不同的冷边界温度下运行。量热计加热内表面绝缘材料的空心圆柱体,周围的浴槽保持冷边界。该量热器用于测量市售泡沫玻璃和由铸造圆柱体加工而成的聚合物气凝胶空心圆柱体的热导率。比较了泡沫玻璃和聚合物气凝胶在室温(290 K)、冰浴(273 K)和液氮(80 K)冷边界温度下的导热率。此外,还报告了使用光学技术对气凝胶平面试样进行室温弹性模量和屈服强度测量的结果,气凝胶平面试样与导热性能测试的圆柱形试样采用了相同的材料。此外,还报告了气凝胶在压缩、室温和低温(液氮)条件下的机械性能。
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引用次数: 0
Experimental Measurement of the Stress Gradient in a Bent Sheet 弯曲板材应力梯度的实验测量
Pub Date : 2024-05-01 DOI: 10.1088/1757-899x/1307/1/012041
Audrie Corral, Eric Colllie, Zhaojun Lu, Grayson Womble, Chester J. Van Tyne
Stress gradients were experimentally measured in a 316 stainless steel sheet after bending with a press brake. Two different tool radii and three different bend angles were used to produce plastically bent sheets. Microhardness tests were performed across the thickness of the bent sheet, and a correlation between microhardness and strength was experimentally determined and was used to obtain the stress gradient. The position of the experimentally determined neutral plane correlated well with theory. Theoretical calculations of the stress gradient were made using a power law constitutive equation along with a simple mechanics analysis of plastic bending. Four of the six bending experimental conditions had reasonable correlation with the theoretical calculations. Ideas for improving this experimental method are discussed.
实验测量了用压力制动器弯曲 316 不锈钢板后的应力梯度。使用了两种不同的工具半径和三种不同的弯曲角度来生产塑性弯曲板材。对弯曲板材的整个厚度进行了显微硬度测试,通过实验确定了显微硬度和强度之间的相关性,并利用该相关性获得了应力梯度。实验确定的中性面位置与理论相关性良好。应力梯度的理论计算采用了幂律构成方程和塑性弯曲的简单力学分析。在六种弯曲实验条件中,有四种与理论计算结果具有合理的相关性。讨论了改进这种实验方法的思路。
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引用次数: 0
Inline Monitoring of the Geometry of Free-form Bent Components 自由曲面弯曲组件几何形状的在线监测
Pub Date : 2024-05-01 DOI: 10.1088/1757-899x/1307/1/012036
Lorenzo Scandola, Daniel Maier, Johannes Meier, Wolfram Volk
The free-form bending process shows a high potential for the manufacturing of bent structural components. Especially in the automotive sector, the process can be employed for the production of arbitrary geometries evolving in the 3D-space, reducing tooling costs and production times. In addition, it is characterised by an outstanding flexibility, and allows the manufacturing of variants of a single component just with the adaption of the tool kinematics. Nevertheless, the reproducibility of the process is a challenging task, and a process monitoring approach is required. In this contribution, an inline-measurement strategy for evaluating the resulting geometry of free-form bent parts is developed. First, a review of the actual measurement system is given. Successively, the inline measurement of the bending radius using a laser displacement sensor, as well as of the bending angle by means of an IR-camera are presented. The obtained inline signals are then processed to retrieve the geometry of the obtained part, and the strategy is validated by comparison with the offline measurement results. The developed inline-system represents the first step towards the development and the monitoring of the free-form bending process.
自由曲面折弯工艺在折弯结构件的制造方面显示出巨大的潜力。特别是在汽车领域,该工艺可用于生产在三维空间中不断变化的任意几何形状,从而降低模具成本并缩短生产时间。此外,该工艺还具有出色的灵活性,只需调整工具的运动学特性,就能制造出单个部件的各种变体。然而,工艺的可重复性是一项具有挑战性的任务,因此需要一种工艺监控方法。在本文中,我们开发了一种在线测量策略,用于评估自由形态弯曲部件的几何形状。首先,对实际测量系统进行了回顾。随后,介绍了使用激光位移传感器在线测量弯曲半径以及使用红外摄像机在线测量弯曲角度的方法。然后对所获得的在线信号进行处理,以检索所获得部件的几何形状,并通过与离线测量结果的比较对该策略进行验证。所开发的在线系统是开发和监控自由形态弯曲过程的第一步。
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引用次数: 0
Optimizing Reverse-Engineered Finite Element Models for Accurate Predictions of Experimental Measurements 优化逆向工程有限元模型,准确预测实验测量结果
Pub Date : 2024-05-01 DOI: 10.1088/1757-899x/1307/1/012040
A R Chezan, T Dhawale, E H Atzema, A Barlo, O Aeddula, J Pilthammar, M Sigvant, N A J Langerak
This study investigates the challenges of reverse engineering in finite element modelling of sheet metal forming, specifically for the Volvo XC90 front door inner component. Advanced models incorporating anisotropic behaviour of steel and non-linear friction are compared against actual real-world measurements. The methodology involves simplifying complex continuous parameters into more manageable representative data sets and assessing model accuracy under both uniform and varied blank holder force settings, guided by measured contact pressure distributions. Although the results indicate an improvement in accuracy, they underscore the need for additional methodological improvements and more accurate replication of tooling effects to enhance the fidelity and effectiveness of these models.
本研究探讨了在钣金成型有限元建模中逆向工程所面临的挑战,特别是沃尔沃 XC90 前门内侧部件。将包含钢的各向异性和非线性摩擦的先进模型与实际测量结果进行了比较。该方法包括将复杂的连续参数简化为更易于管理的代表性数据集,并以测量的接触压力分布为指导,评估模型在均匀和不同坯料夹持力设置下的准确性。尽管结果表明准确性有所提高,但仍强调需要进一步改进方法,更准确地复制工具效应,以提高这些模型的保真度和有效性。
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引用次数: 0
Can process intensification of liquefaction technology for LNG and LH2 accelerate adoption for transportation use? 液化天然气(LNG)和液化氢(LH2)液化技术的工艺强化能否加速运输用途的采用?
Pub Date : 2024-05-01 DOI: 10.1088/1757-899x/1302/1/012025
J A Barclay, C C Archipley
One of the reasons gaseous fuels, methane, and hydrogen, are renewable and sustainable replacements for traditional liquid hydrocarbon-based transportation fuels is their small carbon footprint. Global awareness of the immediate need to address impacts of emissions from transportation energy use has emphasized urgency of changes from business as usual. However, the transition from existing fuels to new fuels is complex because fuel usage is huge, and so many variables influence the rate of adoption. When one reads excellent energy outlooks of major energy companies, data driven reports of international and national energy agencies, along with thoughtful studies of the water, energy, food nexus, the systemic complexities are daunting. Marchetti’s insightful numerical modeling of the rate of transition among different energy sources over the past two centuries with credible validation from recorded usage data shows the time scale for appreciable changes among energy systems is several decades. A further important observation of Marchetti’s work is that transitions among energy sources were and are driven by substitution of superior technology rather than by depletion of prevalent sources. These observations incentivize developments of more efficient, less expensive, robust, scalable methods of production, liquefaction, storage, transport, delivery, and dispensing of hydrogen and natural gas to accelerate adoption by transportation customers. This paper presents a few examples of process intensification in advanced liquefiers for LNG and LH2 at the same location could reduce capital costs, energy costs, and footprints of different sized liquefiers. These combinations could help address gaps in existing technology for several essential needs such as liquefiers for heavy-duty vehicle refueling stations or marine vessel bunkering systems, or refrigerators for storage tank boil-off management systems. Modular, containerized liquefiers plants with several tonne/day capacity could be scaled by interconnecting multiple units to make small industrial plants that match localized fuel demands from distributed mobile users.
气体燃料、甲烷和氢气是传统液态碳氢化合物运输燃料的可再生和可持续替代品,原因之一是它们的碳足迹小。全球都意识到急需解决交通能源使用所产生的排放影响,这强调了改变现状的紧迫性。然而,从现有燃料过渡到新燃料的过程非常复杂,因为燃料用量巨大,而且影响采用率的变量众多。当我们阅读主要能源公司出色的能源展望报告、国际和国家能源机构的数据驱动报告,以及对水、能源、食品关系的深入研究时,系统的复杂性令人生畏。马切蒂对过去两个世纪不同能源之间的转变速度进行了深入的数字建模,并从记录的使用数据中进行了可靠的验证,结果表明能源系统之间发生明显变化的时间尺度为几十年。Marchetti 工作中的另一个重要发现是,能源之间的过渡过去和现在都是由先进技术的替代而不是普遍能源的枯竭所驱动的。这些观察结果鼓励开发更高效、更低成本、更稳健、可扩展的氢气和天然气生产、液化、存储、运输、交付和分配方法,以加快运输客户的采用。本文举例说明了在同一地点生产液化天然气和液化氢的先进液化装置的工艺集约化,可降低不同规模液化装置的资本成本、能源成本和占地面积。这些组合可帮助解决现有技术在满足一些基本需求方面存在的差距,例如重型车辆加气站或海船加油系统的液化器,或储罐沸腾管理系统的制冷器。模块化、集装箱式液化器工厂每天可提供数吨的产能,可通过将多个装置相互连接,形成小型工业工厂,以满足分布式移动用户的本地化燃料需求。
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引用次数: 0
Magnetic Laminates for Motor Slot Wedges and Other Applications 用于电机槽楔和其他应用的磁性层压板
Pub Date : 2024-05-01 DOI: 10.1088/1757-899x/1302/1/012004
A. Krzak, G. Matula, A.J Nowak, C. Ebbing, T. Haugan, M. Sumption
We have examined the properties of G-10-Fe, a commercially manufactured fiber-reinforced epoxy with a 70 wt% inclusion of Fe powder, and the advantages of this material in motor slot wedges are presented. The microstructure of G-10-Fe was observed by SEM/EDS and its magnetic properties were measured in terms of magnetization, saturation magnetization and AC loss. The saturation magnetization was 150 Am2/kg, as determined by vibrating sample magnetometry (VSM). Core losses were measured by spinning magnet calorimetry (SMC). In loss measurements made at applied field frequencies of 10 to 120 Hz essentially only hysteretic loss was present, the per cycle loss was ≅ 19 mJ/cm3. The absence of eddy current loss made G-10-Fe more suitable than bulk Fe for use as motor slot wedge material.
我们研究了 G-10-Fe(一种含有 70 wt% 铁粉的商用纤维增强环氧树脂)的特性,并介绍了这种材料在电机槽楔中的优势。通过 SEM/EDS 观察了 G-10-Fe 的微观结构,并通过磁化、饱和磁化和交流损耗测量了其磁性能。通过振动样品磁力计(VSM)测定的饱和磁化率为 150 Am2/kg。磁芯损耗是通过旋转磁体量热法(SMC)测量的。在外加磁场频率为 10 至 120 Hz 时进行的损耗测量中,基本上只存在滞后损耗,每个周期的损耗为 ≅ 19 mJ/cm3。由于不存在涡流损耗,G-10-Fe 比块铁更适合用作电机槽楔材料。
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引用次数: 0
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IOP Conference Series: Materials Science and Engineering
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