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Varying strain rates and elevated temperatures effects on the mechanical properties of AZ31B magnesium alloy 不同应变率和高温对 AZ31B 镁合金机械性能的影响
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-19 DOI: 10.1177/09544089241271882
Raj Kumar, Mohammad Mursaleen, G.A. Harmain
This study investigates the monotonic tensile behavior of magnesium (Mg) alloy AZ31B across a temperature range from ambient (25 °C) to elevated (up to 300 °C) with varying strain rates (SR) (1.5 × 10−2 to 1.5 × 10−4 s−1). Mechanical properties such as ultimate tensile strength ( σu), tensile yield strength ( σy), strain to failure ( εf), plastic anisotropy ( r-value), strain rate sensitivity ( m) and strain hardening exponent ( n) were investigated in this study for these strain rates. As the temperature increased from 25 to 300 °C, the following changes in mechanical properties were observed: the yield strength ( σy) decreased by 84.50%, the ultimate tensile strength ( σu) decreased by 87%, the modulus of elasticity ( E) decreased by 63.0%, and the elongation increased by 72.0%. The reduction factors (RF) were proposed for the above-mentioned mechanical properties for varying temperature ranges. The impact of varying temperatures and strain rates on fracture surfaces was investigated using field emission scanning electron microscopy (FE-SEM). The results revealed the presence of tenacity nets, cleavage patterns, and an increasing number of dimples as temperatures increased.
本研究调查了镁(Mg)合金 AZ31B 在不同应变率(SR)(1.5 × 10-2 至 1.5 × 10-4 s-1)下,从环境温度(25 °C)到高温(最高 300 °C)范围内的单调拉伸行为。本研究调查了这些应变速率下的机械性能,如极限拉伸强度(σu)、拉伸屈服强度(σy)、破坏应变(εf)、塑性各向异性(r 值)、应变速率敏感性(m)和应变硬化指数(n)。随着温度从 25 ℃ 升至 300 ℃,观察到机械性能发生了以下变化:屈服强度(σy)降低了 84.50%,极限抗拉强度(σu)降低了 87%,弹性模量(E)降低了 63.0%,伸长率增加了 72.0%。针对上述机械性能提出了不同温度范围下的降低系数(RF)。利用场发射扫描电子显微镜(FE-SEM)研究了不同温度和应变率对断裂表面的影响。结果显示,随着温度的升高,出现了韧性网、裂纹和越来越多的凹陷。
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引用次数: 0
Computational study of pulse current and thermal stress on thermoelectric cooler 热电冷却器脉冲电流和热应力的计算研究
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-19 DOI: 10.1177/09544089241271825
N Vijay Krishna, S Manikandan
The thermal performance of a Peltier thermoelectric cooler (TEC) can be enhanced by multi-staging, modifying the geometry of the thermoelement, and using new material with improved thermoelectric properties. This study utilizes COMSOL multiphysics to simulate thermomechanical analyses of various geometries of thermoelectric coolers under pulse current conditions. This investigation explores the influence of pulse current parameters, such as pulse width, pulse ratio, and hot-side convective heat transfer coefficient, on a thermoelectric cooler with different leg geometries. Additionally, the impact of the TEC cold-side temperature, hot-side temperature, and thermal stress on both sides is discussed. The results indicate that TEC leg shapes, such as pin and trapezoid, exhibit the minimum cold-side temperature. Increasing the pulse ratio leads to a decrease in the cold-side temperature and an increase in the hot-side temperature. A notable improvement in the cold-side temperature is also observed with higher pulse ratios, with the pin geometry achieving a minimum cold-side temperature of 276 K. Furthermore, the cooling load affects the temperature on both sides of the TEC. These findings provide valuable insights for optimizing thermoelectric coolers for electronic cooling applications using pulse current methods.
珀尔帖热电半导体制冷片(TEC)的热性能可以通过多级分段、改变热元件的几何形状以及使用热电特性更好的新材料来提高。本研究利用 COMSOL 多物理场模拟脉冲电流条件下各种几何形状的热电半导体制冷片的热力学分析。本研究探讨了脉冲电流参数(如脉冲宽度、脉冲比和热侧对流传热系数)对不同支脚几何形状的热电冷却器的影响。此外,还讨论了 TEC 冷侧温度、热侧温度和两侧热应力的影响。结果表明,针形和梯形等 TEC 脚形状的冷端温度最低。增加脉冲比会导致冷端温度降低,热端温度升高。此外,冷却负荷也会影响 TEC 两侧的温度。这些发现为利用脉冲电流方法优化电子冷却应用中的热电半导体制冷片提供了宝贵的见解。
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引用次数: 0
Optimal configuration selection in reconfigurable manufacturing system considering variable production rate 考虑可变生产率的可重构制造系统中的最佳配置选择
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-19 DOI: 10.1177/09544089241271822
Kamal Kumar Mittal, Alok Vardhan
Various manufacturing companies produce different components, parts, or entire products based on market demands. These needs are met by a variety of manufacturing systems. However, in today's dynamic environment where production capacities and company capabilities are subject to change, reconfigurable manufacturing systems (RMS) have emerged as crucial resources. At the heart of RMS lies the reconfigurable machine tool (RMT), which is designed with modular components to adapt to varying requirements. Evaluating the performance of RMS requires an index. This paper employs weighted sum theory to map various characteristics of RMS and develop a cumulative reconfigurability index. To illustrate the applicability of this methodology, a case study is presented, examining both machine and system levels. There are four configurations having eight RMTs arranged in different manner. The cumulative reconfigurability index is calculated for each configuration and the optimal configuration is selected. From this research, it has been observed that the reconfigurability index of system (d) is the highest, with system (a) having a value close to that of system (d).
各种制造公司根据市场需求生产不同的部件、零件或整个产品。这些需求由各种制造系统来满足。然而,在当今生产能力和公司实力不断变化的动态环境中,可重构制造系统(RMS)已成为至关重要的资源。可重构制造系统的核心是可重构机床(RMT),它采用模块化组件设计,可适应不同的要求。评估 RMS 的性能需要一个指标。本文采用加权和理论来映射 RMS 的各种特性,并开发了累积可重构性指数。为了说明这种方法的适用性,本文介绍了一个案例研究,同时考察了机器和系统两个层面。四个配置有八个以不同方式排列的 RMT。计算每种配置的累积可重构性指数,并选出最优配置。研究发现,系统(d)的可重构性指数最高,系统(a)的可重构性指数与系统(d)接近。
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引用次数: 0
Drilling performance analysis on super duplex stainless steel (AISI 2507) using scalable pulse power plasma TiSiN- and AlTiN-coated tools and optimizing machining parameters through Taguchi–Fuzzy approach 使用可扩展脉冲功率等离子体 TiSiN 和 AlTiN 涂层刀具对超级双相不锈钢(AISI 2507)进行钻孔性能分析,并通过田口-模糊法优化加工参数
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-16 DOI: 10.1177/09544089241270849
Prajwal Agrawal, Shivam Kenche, T Sampath Kumar
In recent years, super duplex stainless steel (SDSS) has gained a lot of importance due to its strength and excellent resistance to corrosion cracking for applications in marine and chemical processing industries, etc. In spite of various progress in the field, the drilling of SDSS leads to the formation of chips that are very strong and abrasive, which makes it challenging to have proper drilling. To overcome this issue by utilizing suitable parameters such as drill bit coating, environmental conditions and parameters for drilling. The SDSS machining output results were compared for both dry and minimum quantity lubrication (MQL) conditions using coated and uncoated drill bits. A scalable pulse power plasma (S3P) technique was utilized to deposit the titanium silicon nitride (TiSiN) and aluminum titanium nitride (AlTiN) coatings on solid carbide drill bits. In the experiments, three levels of drilling parameters have been chosen, including spindle speed (550, 700, 850 rpm), feed rate (0.035, 0.045, 0.060 m/min), and drill bit types. The experiment was designed using Taguchi's orthogonal L9 array. The influence of machining parameters such as cutting force, surface roughness, and circularity error were examined using variance analysis (ANOVA) and signal-to-noise (S/N) ratios. To enhance the drilling process parameters through a single comprehensive output measure, the obtained results were taken as an input to the fuzzy logic networks using multi-factor analysis. At the L7 trial, the least cutting force was observed at 525.7 N for dry conditions and 227.6 N for MQL conditions and gave cone-spiral and continuous chips. In order to analyze the signal-to-noise ratio effectively, high value correspond to better-quality characteristics. In accordance with ANOVA results pertaining to cutting force, a percentage contribution variance of 48.92% was obtained for the feed rate, which contributed to cutting force to a greater extent, followed by 36.82% for spindle speed and 14.19% for the type of drill bit.
近年来,超级双相不锈钢(SDSS)因其高强度和优异的抗腐蚀开裂性能,在船舶和化学加工等行业的应用中得到了广泛重视。尽管在这一领域取得了各种进展,但在对 SDSS 进行钻孔时,仍会形成非常坚固且易磨损的切屑,这给正确钻孔带来了挑战。为了克服这一问题,需要利用合适的参数,如钻头涂层、环境条件和钻孔参数。在使用有涂层和无涂层钻头时,比较了干润滑和最小量润滑(MQL)条件下的 SDSS 加工输出结果。利用可扩展脉冲功率等离子体(S3P)技术在整体硬质合金钻头上沉积氮化钛硅(TiSiN)和氮化铝钛(AlTiN)涂层。实验选择了三个钻孔参数,包括主轴转速(550、700、850 rpm)、进给速度(0.035、0.045、0.060 m/min)和钻头类型。实验采用田口 L9 正交阵列进行设计。利用方差分析(ANOVA)和信噪比(S/N)检验了切削力、表面粗糙度和圆度误差等加工参数的影响。为了通过单一的综合输出指标来提高钻孔工艺参数,利用多因素分析法将获得的结果作为模糊逻辑网络的输入。在 L7 试验中,干式条件下的最小切削力为 525.7 N,MQL 条件下的最小切削力为 227.6 N,并产生了锥螺旋和连续切屑。为了有效分析信噪比,高值对应于更好的质量特性。与切削力相关的方差分析结果显示,进给速率对切削力的贡献率为 48.92%,其次是主轴转速和钻头类型,分别为 36.82%和 14.19%。
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引用次数: 0
Microstructure quantification and phased array ultrasonic inspection of GH3535 alloy weld GH3535 合金焊缝的微观结构量化和相控阵超声波检测
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-02 DOI: 10.1177/09544089241264173
Yuan Xiaodan, Yu Kun, Li Zhijun, Wang Jinlong, Zhang Yuan
The critical problem in accurately characterising the defects in nickel-based alloy weld is the skewing of the ultrasonic beam due to the heterogeneity. This article aims to address this problem by utilising microstructure analysis and mode techniques to account for the skewing of the ultrasonic beam and the formation of root signals in the weld. The macroscopic and microscopic metallography of the weld is quantitatively described, focusing on the GH3535 alloy weld. The mean grain size of the base metal and the weld are 60 and 400 μm, respectively. The local crystal orientation map of the weld is obtained using the electron backscatter diffraction technique, revealing a preferred orientation of the grains in the <100> direction. The propagation of the ultrasonic beam in GH3535 alloy weld was visualised by CIVA software. The beam's degree of skewing and splitting is related to the grain's angle of orientation difference. Phased array ultrasonic tests were conducted using a 64 L linear array probe with a centre frequency of 2.25 MHz to inspect the weld and side-drilled holes with a diameter of 3 mm. The echo signals from side-drilled holes in different depths were analysed in both the simulation and tests. The quantitative deviation of depth at the centre and lower end of the weld is 2.6% and 6%. The signal–noise ratio of the side-drilled holes in the weld in the test is 12.5–15.8 dB. The root signals were observed in the weld but not in the base metal. The forming mechanism of the root signal was elucidated by analysing the vertical orientation of the grains.
准确表征镍基合金焊缝缺陷的关键问题是异质性导致的超声波束偏斜。本文旨在利用微观结构分析和模式技术来解释超声波束的偏斜和焊缝中根信号的形成,从而解决这一问题。本文以 GH3535 合金焊缝为重点,对焊缝的宏观和微观金相进行了定量描述。母材和焊缝的平均晶粒尺寸分别为 60 和 400 μm。利用电子反向散射衍射技术获得了焊缝的局部晶体取向图,显示了晶粒在 <100>方向上的优先取向。CIVA 软件对 GH3535 合金焊缝中超声波束的传播进行了可视化处理。光束的偏斜和分裂程度与晶粒的取向角差异有关。使用中心频率为 2.25 MHz 的 64 L 线性阵列探头对焊缝和直径为 3 mm 的侧钻孔进行了相控阵超声波测试。模拟和测试均分析了不同深度侧钻孔的回波信号。焊缝中心和下端的深度定量偏差分别为 2.6% 和 6%。测试中焊缝侧钻孔的信噪比为 12.5-15.8 dB。在焊缝中观察到了根部信号,但在母材中没有观察到。通过分析晶粒的垂直取向,阐明了根信号的形成机制。
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引用次数: 0
Detecting and classifying defects on the surface of water heaters: Development of an automated system 对热水器表面的缺陷进行检测和分类:开发自动化系统
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-02 DOI: 10.1177/09544089241262945
Ângela Semitela, André Ferreira, António Completo, Nuno Lau, José P Santos
Seeking a total automation of the existing industrial processes, manual product quality control systems have been gradually replaced by automated ones, to significantly improve efficiency and speed, and ultimately, increase industrial productivity. In this regard, an automated inspection system was developed in this work to detect and classify defects on the painted surfaces of Bosch Thermotechnology water heaters. This system comprised a deflectometry-based image acquisition module, two light deep learning models built and trained from scratch for defect detection and classification in the painted surfaces and a visual interface. The experimental results confirmed that: (1) deflectometry techniques were crucial for an accurate defect detection; (2) the two lightweight models – for detection and classification – rapidly achieved high accuracies, even in the testing stage, demonstrating their high performance regardless of their small size; (3) the developed system was able to correctly and quickly predict the status of a painted surface, and then successfully send this status information to a user-friendly visual interface, validating its suitability for an industrial setting. Overall, this system demonstrated great potential as a suitable alternative to the existing manual inspection of the painted surfaces of Bosch Thermotechnology water heaters.
为了实现现有工业流程的全面自动化,人工产品质量控制系统逐渐被自动化系统所取代,以显著提高效率和速度,最终提高工业生产力。为此,我们开发了一套自动检测系统,用于检测博世热力技术热水器喷漆表面的缺陷并对其进行分类。该系统由一个基于偏转测量的图像采集模块、两个从零开始建立和训练的轻型深度学习模型(用于检测和分类涂漆表面的缺陷)和一个可视化界面组成。实验结果证实(1) 偏转测量技术对于准确检测缺陷至关重要;(2) 用于检测和分类的两个轻量级模型即使在测试阶段也能迅速达到很高的准确度,这证明了它们的高性能,尽管它们的体积很小;(3) 所开发的系统能够正确、快速地预测油漆表面的状态,然后成功地将这些状态信息发送到用户友好的可视化界面,验证了其在工业环境中的适用性。总之,该系统作为博世热力技术热水器油漆表面现有人工检测的合适替代方案,显示出巨大的潜力。
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引用次数: 0
On electrochemical machining with an interelectrode slit for a partially insulating cathode 关于部分绝缘阴极带电极间狭缝的电化学加工技术
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-02 DOI: 10.1177/09544089241264186
Gurwinder Singh, Rupinder Singh, P Sudhakar Rao
Electrochemical machining is an established non-conventional machining process in which material removal during electrolysis relies on the quantity of electricity passed through the electrolyte. The amount of electricity passed further depends on several factors, such as electrochemical reactivity/dissolution, penetration rate, tool properties (profile, surface area, and material), electrical conductivity, chemical composition, temperature sensitivity, crystal structure, and initial surface roughness (Ra) of workpiece material, voltage, feed rate, electrolyte selection/concentration, etc. As per reported studies, a thermoplastic inter-electrode slit of rectangular/square profile between the tool and workpiece in modified electrochemical machining helps to generate the cavity with a better aspect (h/d) ratio without changing the tool profile. However, little has been reported on the effect of variation in interelectrode slit thickness on material removal rate/penetration rate. In this study, the results of experimental investigations for material removal rate/penetration rate with modified electrochemical machining using a square inter-electrode slit of variable thickness between the cathode (circular tool) and anode (workpiece) with 03 different materials (Al, Cu, and Ti) have been presented. Taguchi L18, orthogonal array-based design of experiments, has been used in parametric optimization of the modified electrochemical machining process. Overall, the best settings for material removal rate in modified electrochemical machining are electrolyte concentration 150 g/L, voltage 21 V, tool material Cu, workpiece Al, interelectrode slit thickness 1.5 mm, and tool feed rate 132 µm/min. The outcomes have been braced by scanning electron microscopy, energy dispersive spectroscopy, and Ra analysis.
电化学加工是一种成熟的非常规加工工艺,电解过程中材料的去除取决于通过电解液的电量。通过的电量取决于多个因素,如电化学反应/溶解、穿透率、工具特性(轮廓、表面积和材料)、导电性、化学成分、温度敏感性、晶体结构和工件材料的初始表面粗糙度 (Ra)、电压、进给速度、电解液选择/浓度等。根据已报道的研究,在改良电化学加工中,刀具和工件之间的矩形/方形热塑性电极间缝有助于在不改变刀具轮廓的情况下产生具有更好纵横比(h/d)的空腔。然而,有关电极间狭缝厚度变化对材料去除率/穿透率影响的报道却很少。在本研究中,介绍了使用阴极(圆形工具)和阳极(工件)之间厚度可变的方形电极间缝隙,对 03 种不同材料(Al、Cu 和 Ti)进行改良电化学加工的材料去除率/穿透率的实验研究结果。改良电化学加工工艺的参数优化采用了基于正交阵列的 Taguchi L18 实验设计。总体而言,改良电化学加工中材料去除率的最佳设置为电解液浓度 150 g/L、电压 21 V、刀具材料 Cu、工件 Al、电极间缝隙厚度 1.5 mm 和刀具进给速度 132 µm/min。研究结果通过扫描电子显微镜、能量色散光谱和 Ra 分析进行了验证。
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引用次数: 0
Influencing the optimum AWJM key factors on drilling quality of biochar-interlaced glass fibre-reinforced epoxy composites: Multi-response optimisation approach 影响生物炭夹层玻璃纤维增强环氧树脂复合材料钻孔质量的最佳 AWJM 关键因素:多响应优化方法
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-02 DOI: 10.1177/09544089241267130
KG Saravanan, S Gokulraj, M Rajesh, S Ram Prakash
In recent years, the inclusion of biochar fillers in the polymer matrix has been used to enhance the mechanical, dielectric and dynamic properties of the composite. High-performance structural components are often made using polymer composites. This work focuses on the development of glass fibre interleaved almond biochar filler (ABC-5, 10 and 15%) reinforced polymer composites through a hand layup process. The machinability of the composite was then investigated in abrasive water jet machining by considering the biochar filler quantity, water pressure (WP), traverse speed (TS) and standoff distance (SOD). The kerf angle (KA) and surface roughness (SR) were used to assess the machining performance. The addition of a biochar filler in the composite increases the SR and KA quality. The machining performance of the biochar-filled composite is better when there is an increase in water pressure and a decrease in SOD and TS. Analysis of Variance (ANOVA) reveals that the ABC% significantly influence the SR and KA trialed by JP. The combination of WP 200 MPa with ABC10% composite laminate results in decreased values of KA (1.09o) and SR (2.754 µm). The ideal parameters for achieving lower SR and KA are TS of 20 mm/min, 3 mm of SOD, 200 bar of WP and 10% biochar composite in combination. Moreover, scanning electron microscopic (SEM) images ensure the smoothness of the surface texture at high water pressure (WP) with 10% almond biochar composite laminate, cutting and finishing are smooth. The biochar fillers reinforced in hybrid composites exhibited good surface quality, free of pullouts and fibre delamination.
近年来,在聚合物基体中加入生物炭填料已被用于提高复合材料的机械、介电和动态性能。高性能结构组件通常采用聚合物复合材料制造。这项工作的重点是通过手糊工艺开发玻璃纤维交错杏仁生物炭填料(ABC-5,10% 和 15%)增强聚合物复合材料。然后,通过考虑生物炭填料的数量、水压 (WP)、横移速度 (TS) 和间距 (SOD),研究了复合材料在加砂水射流加工中的可加工性。切口角 (KA) 和表面粗糙度 (SR) 用于评估加工性能。在复合材料中添加生物炭填料可提高 SR 和 KA 质量。当水压增加、SOD 和 TS 下降时,生物炭填充复合材料的加工性能更好。方差分析(ANOVA)表明,ABC% 对 JP 试验的 SR 和 KA 有显著影响。WP 200 MPa 与 ABC10% 复合层压板的组合导致 KA 值(1.09o)和 SR 值(2.754 µm)降低。达到较低 SR 和 KA 值的理想参数是 20 毫米/分钟的 TS、3 毫米的 SOD、200 巴的 WP 和 10%的生物炭复合材料。此外,扫描电子显微镜(SEM)图像确保了 10%杏仁生物炭复合材料层压板在高水压(WP)下表面纹理的平滑性,切削和抛光都很顺畅。在混合复合材料中增强的生物炭填料显示出良好的表面质量,没有拉丝和纤维分层现象。
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引用次数: 0
Investigation of the influence of the rivet geometry on joint formation for a versatile self-piercing riveting process 研究铆钉几何形状对多功能自冲铆接工艺接头形成的影响
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-02 DOI: 10.1177/09544089241263141
Fabian Kappe, Mathias Bobbert, Gerson Meschut
Climate change has led to a large number of countries deciding to reduce carbon dioxide (CO2) emissions significantly. As the mobility sector is a major contributor to CO2, various strategies are being pursued to achieve the climate targets set. An increasingly applied lightweight design method is the use of multi-material constructions. To join these structures, mechanical joining technologies such as self-pierce riveting are being used. As a result of the currently rigid tool systems, which cannot react to changing boundary conditions, a large number of rivet–die combinations is required to join the rising number of materials as well as material thickness combinations. Thus, new, versatile joining technologies are needed that can react to the described changes. The versatile self-piercing riveting (V-SPR) process is one possible approach. In this process, different material thicknesses can be joined by using a multi-range capable rivet which is set by a joining system with extended actuator technology. In this study, the V-SPR joining process is analysed numerically according to the influence of the geometrical rivet parameters on the joints characteristics as well as the resulting material flow. The investigations showed that the shank geometry has a decisive influence on the expansion of the rivet. Furthermore, the rivet length could be proven to be an influencing factor. By changing the head radii and the protrusion height, the forming behaviour of the rivet head onto the punch-sided joining part could be improved and thus the formation of air pockets was prevented. Based on the numerical investigations, a novel rivet geometry was developed and produced by machining. Subsequently, experimentally produced joints were analysed according to their joint formation and load-bearing capacity.
气候变化导致许多国家决定大幅减少二氧化碳(CO2)排放量。由于汽车行业是二氧化碳的主要排放源,因此各国正在采取各种策略来实现既定的气候目标。一种应用日益广泛的轻质设计方法是使用多材料结构。为了连接这些结构,目前正在使用自冲铆接等机械连接技术。由于目前的工具系统比较僵硬,无法对不断变化的边界条件做出反应,因此需要大量的铆钉-模具组合来连接不断增加的材料和材料厚度组合。因此,需要能够应对上述变化的新型多功能连接技术。多功能自冲铆接(V-SPR)工艺就是一种可行的方法。在这种工艺中,不同厚度的材料可以通过使用多范围铆钉进行连接,而这种铆钉是由采用扩展致动器技术的连接系统设置的。在本研究中,根据铆钉几何参数对接头特性以及由此产生的材料流动的影响,对 V-SPR 连接工艺进行了数值分析。研究表明,铆钉柄的几何形状对铆钉的膨胀有决定性影响。此外,铆钉长度也是一个影响因素。通过改变铆钉头的半径和突出高度,可以改善铆钉头在冲压连接部件上的成型性能,从而防止气穴的形成。在数值研究的基础上,开发了一种新型铆钉几何形状,并通过机械加工生产出来。随后,根据铆接成型和承载能力对实验生产的接头进行了分析。
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引用次数: 0
Impact of varying injection pressure on CI engine characteristics fuelled with Ceiba pentandra biodiesel and NOx reduction strategy 不同喷射压力对以五味子生物柴油为燃料的 CI 发动机特性的影响以及氮氧化物减排策略
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-02 DOI: 10.1177/09544089241263754
B Saravanan, MA Asokan
The novelty of the present work deals with the experimental investigation on the effects of varying injection pressure (IP) on CI engine characteristics using a novel Ceiba pentandra biodiesel at 20% by volume (B20). The key objective of this study is to enhance the engine characteristics by increasing the IP of the fuel blends without any major engine modifications This strategy could improve the performance of the engine as higher IP resulted in improved atomization and better air-fuel mixing. From the experimentation it was found that combined strategy of biodiesel blend (B20) and higher IP (260 bar) resulted in increased BTE (9%), CP (8.5%), HRR (2%) and reduced BSFC (9%), CO (14%), HC (16%), and Smoke (16%) than diesel (B0) at a standard IP of 200 bar. To overcome the challenges of higher NOx emission at higher IP, exhaust gas recirculation (EGR) technique is also implemented at lower rates. With the effect of 15% EGR, there was a subsequent 29% reduction in NOx emission achieved without affecting other emissions trade-offs.
本研究的新颖之处在于使用体积分数为 20% (B20)的新型 Ceiba pentandra 生物柴油,对不同喷射压力(IP)对 CI 发动机特性的影响进行了实验研究。这项研究的主要目的是在不对发动机进行任何重大改动的情况下,通过提高混合燃料的 IP 值来增强发动机的性能。实验发现,生物柴油混合燃料(B20)和更高的 IP 值(260 巴)的组合策略比标准 IP 值为 200 巴的柴油(B0)提高了 BTE(9%)、CP(8.5%)、HRR(2%),降低了 BSFC(9%)、CO(14%)、HC(16%)和烟尘(16%)。为了克服较高 IP 值下氮氧化物排放量较高的难题,还采用了废气再循环(EGR)技术,但废气再循环率较低。在 15%的 EGR 作用下,氮氧化物排放量随后减少了 29%,而不会影响其他排放权衡。
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引用次数: 0
期刊
Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
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