Article
Engineering, Mechanical
Axel Bjerke, Andrii Hrechuk, Filip Lenrick, Andreas Markstrom, Henrik Larsson, Susanne Norgren, Rachid M'Saoubi, Thomas Bjork, Volodymyr Bushlya
Summary: This study investigates the interactions between tool, coating, workpiece, coolant and atmospheric oxygen to predict reaction products that retard tool wear. The established modeling framework enables better control over tool life in machining by predicting phase composition and protective interaction products. Validation of the model through cutting tests shows promise for future applications in predicting tool wear and formation of tool protection layers.
Article
Engineering, Mechanical
Axel Bjerke, Andrii Hrechuk, Filip Lenrick, Rachid M'Saoubi, Henrik Larsson, Andreas Markstrom, Thomas Bjork, Susanne Norgren, Jan-Eric Stahl, Volodymyr Bushlya
Summary: The ability to control the shape, distribution, and composition of non-metallic inclusions plays a critical role in steel making, particularly in enhancing machinability. This study focuses on the anomalous wear of Al2O3 coatings when turning soft Ca-treated steels, and identifies chemical interactions between the alumina coating and non-metallic inclusions such as calcium aluminates and alumina-magnesia spinel. High cutting temperatures and the presence of oxygen affect the reaction between CaO, MgO, and Al2O3. The study suggests potential improvements in machinability by controlling the chemical interaction between Ca and Mg based inclusions and alumina coatings.
Article
Engineering, Electrical & Electronic
Jan Melichercik, Jozef Krilek, Jan Kovac, Tomas Kuvik, Marian Kucera
Summary: This research focuses on evaluating the wear of delimbing knife's cutting edge using contactless methods. The study found that the blade angle and wood diameter significantly affect the amount of wear on the cutting edge, which in turn increases the cutting force. Furthermore, improving the efficiency and reducing energy consumption of the harvester machine is crucial for economic benefits.
Article
Engineering, Mechanical
Sebastian Krauss, Armin Seynstahl, Stephan Tremmel, Bernd Meyer, Erik Bitzek, Mathias Goken, Tadahiro Yokosawa, Benjamin Apeleo Zubiri, Erdmann Spiecker, Benoit Merle
Summary: Industrial upscaling often leads to a different coating microstructure compared to laboratory prototypes. In this study, we observed a crystallographic reorientation towards a basal texture in physical vapor deposited MoS2 coatings after wear testing. This favorable reorientation can improve the friction properties of the coatings, making them comparable to ideal chemical vapor deposited MoS2 single crystals.
Review
Chemistry, Physical
Sergey N. Grigoriev, Thet Naing Soe, Khaled Hamdy, Yuri Pristinskiy, Alexander Malakhinsky, Islamutdin Makhadilov, Vadim Romanov, Ekaterina Kuznetsova, Pavel Podrabinnik, Alexandra Yu Kurmysheva, Anton Smirnov, Nestor Washington Solis Pinargote
Summary: This paper reviews the studies carried out to date on the texturing of ceramic and superhard cutting tools, summarizes the most common methods for creating textures on different materials, and describes the parameters generally used in surface texturing. It also proposes a classification method for the texture surfaces of cutting tools based on their geometric parameters. The paper focuses on the effect of ceramic and superhard textured cutting tools in improving the machining performance of difficult-to-cut materials.
Article
Materials Science, Ceramics
Kaishuo Chang, Yujuan Dong, Guangming Zheng, Xiuli Jiang, Xianhai Yang, Xiang Cheng, Huanbao Liu, Guangxi Zhao
Summary: This study investigates the influence of surface integrity on the high-speed sliding wear and cutting performance of coated tools. The results show that low surface roughness effectively reduces the friction coefficient, while high surface hardness and compressive residual stress minimize fluctuations in the friction coefficient. The cutting performance of coated tools is primarily influenced by surface hardness and residual stress.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Thomas Childerhouse, Rachid M'Saoubi, Luiz F. P. Franca, Pete Crawforth, Martin Jackson
Summary: Polycrystalline diamond (PCD) is being developed as a new cutting tool material for titanium alloy machining. The high temperature hardness of PCD can improve productivity by enabling higher cutting speeds. This study examines the performance of different PCD tool grades in milling Ti-54M, and finds that smaller grain size offers better tool life due to superior fracture toughness. The study also compares the surface integrity of PCD and carbide machining, and shows that PCD results in lower microstructural damage and cutting forces.
Article
Materials Science, Ceramics
A. Sezer cam, T. Oguzhan Erguder, Guerkan Kaya, Fatih Yildiz
Summary: In this study, bilayer TiAlN/TiSiN and monolayer AlCrSiN ceramic films were grown on carbide cutting tool material to improve the structural/tribological properties and milling performances. The coated materials' properties were evaluated and the actual working performance of the coated cutting tools was determined by machining experiments. The results showed that the bilayer TiAlN/TiSiN coating had higher hardness and adhesion compared to the monolayer AlCrSiN coating, resulting in lower wear rate and mass loss after machining.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Manufacturing
Shubhashree Mohapatra, Hrushikesh Sarangi, Upendra Kumar Mohanty
Summary: Single-point cutting tools were developed using a novel technique of centrifugal casting with scrapped tools, showing comparable cutting ability to traditional high-speed steel tools when cutting mild steel workpieces. The cost-effective method yielded tools with similar performance to those available in the market. The centrifugal casting process presents a viable alternative for developing single-point cutting tools.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Ceramics
Sheng-Jin He, Si-Chun Luo, Wei-Ming Guo, Wan-Xin Wei, Hua-Tay Lin
Summary: The cutting performances of Si3N4 ceramic cutting tools with and without boride additive were investigated. The addition of 2.5 vol% ZrB2 or TiB2 improved the hardness and toughness of Si3N4 ceramics. The boride-containing Si3N4 ceramic cutting tools showed higher cutting lengths compared to monolithic Si3N4 ceramic. This improvement indicates the potential use of boride-containing Si3N4 ceramics in the field of ceramic cutting tools.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Polymer Science
Francois Ducobu, Eloise Melice, Edouard Riviere-Lorphevre, Thomas Beuscart, Oihan Aizpuru, Aurelie Granjon, Paulo Flores, Denis Soriano, Mikel Cuesta, Pedro-Jose Arrazola
Summary: This study aims to investigate the influence of different tool geometries on the milling of GFRP composites. The results indicate that PCD tools with straight edge and inclined peripheral tooth shape perform the best in terms of reducing delamination and cutting forces.
Review
Energy & Fuels
Lukasz Boloz, Witold Bialy
Summary: Mechanical mining is a widely used method for separating materials and constructing underground structures. The effectiveness of the mining process is influenced by the mechanical properties and abrasiveness of the rocks. This article reviews methods and stands for testing mining tools, but finds a lack of appropriate methods for testing the wear rate of materials intended for these tools.
Article
Chemistry, Physical
Qimin Hou, Xuefeng Yang, Dan Li, Jian Cheng, Shouren Wang, Jupeng Xiao, Wanyang Li
Summary: The use of femtosecond laser micro/nano-texturing and fluoridization on cutting tools improves their tribological performance and machining quality, enhancing anti-adhesion, anti-friction, and wear resistance capabilities.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Mechanical
Munish Kumar Gupta, Qinghua Song, Zhanqiang Liu, Rupinder Singh, Murat Sarikaya, Navneet Khanna
Summary: The research study involved the fabrication and use of textured tools for machining under different cooling conditions, with nanofluids combined with textured tools showing superior results. This establishes textured tools as a sustainable alternative to existing cutting tool technology in the manufacturing industry.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Julien Witte, Daniela Huebler, Dirk Schroepfer, Andreas Boerner, Thomas Kannengiesser
Summary: Currently, niobium resources exceed tungsten resources by a significant margin. Brazil is the largest global producer of niobium, accounting for 92% of the market share. Niobium carbides (NbC) offer a sustainable and economic alternative to conventional cutting materials, such as tungsten carbides (WC). This study aims to explore the potential of NbC tools for milling applications through experiments and analyses.
Article
Materials Science, Multidisciplinary
Ahmad Chaim, Heba Abunahla, Baker Mohammad, Nahla Alamoodi, Anas Alazzam
Summary: The development of flexible memristor devices using paper-based graphene oxide has great potential for wearable electronics. The PrMem device, made of cellulose and reduced graphene oxide, demonstrates resistive switching properties and eliminates the need for additional pumping structures due to its hydrophilic nature. The research opens up new possibilities for using paper-based memristor devices in various applications.
Article
Green & Sustainable Science & Technology
Kotturu V. V. Chnadra Mouli, L. Syam Sundar, A. M. Alklaibi, Zafar Said, K. V. Sharma, V. Punnaiah, Antonio C. M. Sousa
Summary: This paper experimentally analyzed the thermal efficiency, Nusselt number, exergy efficiency, thermal entropy generation, and frictional entropy generation of natural circulation of water-based multi-walled carbon nanotubes nanofluids flow in a flat plate collector. The results showed that the heat transfer coefficient, Nusselt number, and exergy efficiency increased gradually from 09:00 hr to a maximum value at 13:00 hr and then decreased gradually until the end of the test at 16:30 hr. Regression equations were developed for Nusselt number and friction factor for two time durations. At the peak value of 13:00 hr, the thermal and exergy efficiencies increased significantly compared to water.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Chemistry, Multidisciplinary
Heba N. Abunahla, Humaira Zafar, Dalaver H. Anjum, Anas Alazzam, Baker Mohammad
Summary: The study presents a novel fabrication method for graphene oxide (GO)-based memristor devices on an active/shrinkable substrate. The devices are fabricated using standard lithography process on a polymer substrate that can shrink at a certain temperature. The results demonstrate that the shrunk devices maintain their switching ability with improved electrical parameters, while the deposited GO film on the active substrate shows enhanced properties after shrinking. This novel approach offers insights into scaling thin-film electronics postfabrication and enables the realization of GO-based electronic devices with improved electrical properties.
Article
Chemistry, Multidisciplinary
Yawar Abbas, Sumayya M. Ansari, Inas Taha, Heba Abunahla, Muhammad Umair Khan, Moh'd Rezeq, Haila M. Aldosari, Baker Mohammad
Summary: Recently, phase change chalcogenides, particularly monochalcogenides, have shown potential as switching materials for conduction-bridge-based memristors. However, previous studies have mainly focused on the formation and rupture of an Ag filament during the SET and RESET processes, disregarding the contributions of the phase change phenomenon and the distribution and re-distribution of germanium vacancies defects. In this study, GeTe-based devices with different thicknesses were investigated, revealing the effectiveness of phase loops and defect loops for future applications in neuromorphic computing. The electrical characteristics of the devices were examined, and it was found that a 100 nm-thick GeTe device exhibited highly reproducible phase change and defect-based characteristics, while 70 nm and 200 nm-thick devices were not suitable for reliable memory performance. Further analysis of the 100 nm-thick GeTe device revealed a state-of-the-art dependency of phase loops and defect loops on the starting and stopping voltage sweeps applied on the top Ag electrode, providing a deeper understanding of the switching mechanism of monochalcogenide-based conduction-bridge memristors.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Environmental
Shoaib Anwer, Muhammad Umair Khan, Baker Mohammad, Moh 'd Rezeq, Wesley Cantwell, Dongming Gan, Lianxi Zheng
Summary: This article focuses on developing a durable triboelectric nanogenerator (TENG) with high-power density and improved cycling performance by utilizing advanced 2D nano-materials and an innovative design. The optimized TENG demonstrated an open-circuit voltage (V-oc) of 390 V, short-circuit current (I-sc) of 96 μA, and a power density of 6.66 W/m². The research also explores the potential applications of the TENG, including pressure sensors and powering electronic devices.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Multidisciplinary Sciences
Muhammad Umair Khan, Eman Mohammad, Yawar Abbas, Moh'd Rezeq, Baker Mohammad
Summary: This work introduces a high-performance, low-cost, biocompatible triboelectric nanogenerator (TENG) made from chicken skin (CS). The CS-TENG can power wearable devices, improving electronic monitoring, prediction, and treatment capabilities. It also supports sustainability by reducing waste in the poultry industry. The CS-TENG demonstrates impressive endurance and can scavenge energy for various applications, making it a promising step towards sustainable, battery-less devices or augmented energy sources.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Sumayya M. Ansari, Inas Taha, Xiaoping Han, Dalaver H. Anjum, Baker Mohammad, Noureddine Amrane, Maamar Benkraouda, Haila M. Aldosari
Summary: This study investigates the influence of molybdenum (Mo) doping on the local atomic structure, morphology, and electrical properties of amorphous germanium telluride (GeTe) thin films. The results show that Mo-doping inhibits the crystallization of GeTe thin films and increases the crystallization temperature. The electrical properties and optical bandgap of Mo-doped GeTe thin films are also discussed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Mohd Farid Ismail, Wan Hamzah Azmi, Rizalman Mamat, Korada Viswanatha Sharma, Hafiz Muhammad Ali
Summary: Proper preparation and stability evaluation of nanolubricant are crucial in the application of nanoparticle dispersion technique in a two-phase system. The stability of nanolubricant ensures maximum benefit from nanoparticle dispersion in specified Polyvinyl ether (PVE). In this study, TiO2/PVE nanolubricant was prepared using two physical homogenization methods: high-speed homogenizer (HSH) and ultrasonication bath. The stability of the nanolubricant was evaluated using various techniques, and results showed that ultrasonication homogenizing methods had better stability with a zeta potential of over 60 mV.
Article
Chemistry, Multidisciplinary
Muhammad Umair Khan, Yawar Abbas, Moh'd Rezeq, Anas Alazzam, Baker Mohammad
Summary: This study presents a method to enhance data processing by integrating a unidirectional analogue artificial neuromorphic memristor device with a piezoelectric nanogenerator, taking inspiration from biological information processing. A self-powered unidirectional neuromorphic resistive memory device is proposed, comprising an ITO/ZnO/Yb2O3/Au structure combined with a high-sensitivity piezoelectric nanogenerator (PENG) ITO/ZnO/Al. The integration enables the creation of a self-powered artificial sensing system that converts mechanical stimuli from the PENG into electrical signals, which are subsequently processed by analogue unidirectional neuromorphic device to mimic the functionality of a neuron without requiring additional circuitry. This emulation encompasses crucial functions such as potentiation, depression, and synaptic plasticity. Furthermore, this study highlights the potential for hardware implementations of neural networks with a weight change of memristor device with nonlinearity (NL) of potentiation and depression of 1.94 and 0.89, respectively, with an accuracy of 93%. The outcomes of this research contribute to the progress of next-generation low-power, self-powered unidirectional neuromorphic perception networks with correlated learning and trainable memory capabilities.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Israr Ahmed, Mohamed Elsherif, Murad Ali, Amal Al Ghaferi, Baker Mohammad, Haider Butt
Summary: Diabetes is a leading cause of death worldwide. Developing low-cost, rapid, and reusable sensors can provide a solution for continuous glucose monitoring to reduce the potentially fatal complications of diabetes. In this study, Phenylboronic acid (PBA)-based hydrogel sensors with embedded photonic nanostructures were developed for rapid and continuous glucose quantification within the physiological range.
MATERIALS & DESIGN
(2023)
Proceedings Paper
Computer Science, Artificial Intelligence
Mohammed F. Tolba, Hani Saleh, Baker Mohammad, Mahmoud Al-Qutayri, Thanos Stouraitis
Summary: This paper proposes an efficient hardware accelerator called EACNN for Convolutional Neural Networks (CNNs). EACNN is based on the co-optimization of algorithms and hardware, and uses linear approximation of weights to reduce computations and memory accesses. Experimental results show that the proposed method can reduce the number of multiplications in the network by around 61% without significant loss of accuracy (< 3%). A hardware accelerator based on EACNN achieved a 50% reduction in FPGA hardware resources.
2023 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, ISCAS
(2023)
Article
Computer Science, Information Systems
Huruy Tesfai, Hani Saleh, Mahmoud Al-Qutayri, Baker Mohammad, Thanasios Stouraitis
Summary: Deep learning networks achieve high accuracy for classification tasks but are usually too computationally and memory intensive for power-constrained devices. Low-bit quantization is an effective technique to reduce this burden, but it introduces quantization error and decreases classification accuracy. We propose a quantization error-aware gradient estimation method for power-of-two and additive power-of-two quantization, which minimizes quantization error by aligning weight update with projection steps. We also apply per-channel quantization to minimize accuracy degradation caused by the rigid resolution property of power-of-two quantization. This approach enables comparable accuracy even at ultra-low bit precision.
Review
Computer Science, Information Systems
Rami Homsi, Nosayba Al-Azzam, Baker Mohammad, Anas Alazzam
Summary: Detecting cancer biomarkers at an early stage is crucial for recovery, and researchers have been interested in developing reliable and cost-effective devices for point-of-care screening. This review focuses on memristive biosensors and compares them to other electrochemical devices for cancer biomarker detection. Memristive biosensors have demonstrated lower limits of detection compared to field effect transistors and electrochemical immunosensors. The fabrication of memristive biosensors using silicon nanowires is common but exploring different materials and structures may improve reproducibility.
Article
Engineering, Electrical & Electronic
Tasneem Assaf, Arafat Al-Dweik, Youssef Iraqi, Sobia Jangsher, Anshul Pandey, Jean-Pierre Giacalone, Enas E. Abulibdeh, Hani Saleh, Baker Mohammad
Summary: Physical layer security (PLS) is used for efficient key generation and sharing in secured wireless systems. This work proposes a novel system design that integrates physically unclonable functions (PUFs) and channel reciprocity (CR) to overcome the randomness constraint of the wireless channel and enable high-rate secret key generation. The system utilizes an adaptive and controllable artificial fading (AF) level with interleaving to mitigate the impact of low randomness variations in the channel. Monte Carlo simulation results show that the proposed system operates efficiently even in nearly flat or time-invariant channels, with significantly shorter key generation and sharing time compared to conventional techniques.
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2023)
Proceedings Paper
Automation & Control Systems
Welelaw Yenieneh Lakew, Arafat Al-Dweik, Mahmoud Aldababsa, Mohamed A. Abou-Khousa, Baker Mohammad
Summary: This paper analyzes the bit error rate performance of a power domain NOMA-OFDM system with time-domain interleaving over frequency selective Rayleigh channel. Theoretical BER expressions for an arbitrary number of users using minimum mean squared error equalizer are developed. The simulation results show that the proposed power domain NOMA-OFDM system with TDI has better BER performance over frequency-selective fading multipath channels compared to the conventional NOMA-OFDM system without TDI.
2023 IEEE 97TH VEHICULAR TECHNOLOGY CONFERENCE, VTC2023-SPRING
(2023)
Article
Engineering, Mechanical
Yankui Song, Ke Xiao, Guo Xiang
Summary: The novelty of this study lies in constructing an Entropy-based wear and fluid-solid-thermal (FST) coupled model for journal bearings, and revealing the transient interaction behavior between wear evolution and FST evolution during repeated starting and stopping. The wear rate is measured experimentally, and the contact temperature, friction coefficient and normal contact force are obtained from the validated FST model. Wear tests and numerical calculations are conducted to validate the predicted wear rate and investigate the time-varying wear and FST evolution of journal bearings.
Article
Engineering, Mechanical
Xin-long Liu, Xin Guan, Yuan Zhong, Qian Xiao, Yong Cao, Wu-lue Zhang, Song Zhang, Yi-ting Zheng, Ming-sheng Gao, Dao-yun Chen, Wen-bin Yang
Summary: Gaps in the conductor rail joints of intercity trains have an impact on current transmission and the wear of carbon skateboards. These gaps decrease the coefficient of friction, increase electrical contact resistance, and affect the wear rate of carbon skateboards.
Article
Engineering, Mechanical
Yuhang Wu, Conglin Dong, Xiuqin Bai, Chengqing Yuan
Summary: The study developed a new composite material by incorporating hexagonal boron nitride (h-BN) particles into a thermoplastic polyurethane (TPU) matrix, which exhibited excellent self-lubricating properties and reduced frictional excitation forces. The addition of h-BN particles effectively reduced the coefficient of friction, decreased fluctuation amplitude, enhanced wear resistance, and attenuated vibration behaviors.
Article
Engineering, Mechanical
Tiancheng Ouyang, Xiuyang Sun, Wentao Tang, Yinxuan Li, Zhi Qun Tian, Yanzhou Li
Summary: By adding nitrogen-doped graphene and C60 nanoparticles to the lubricant, a highly efficient nano-lubricant with vibration and noise reduction properties is synthesized.
Article
Engineering, Mechanical
Xin Zhuo, Jun Cao, Haibo Huang, Li Liu, Xinkun Suo, Peiqing Ye, Zeshan Abbas
Summary: A polymer coating prepared by liquid spraying technology on the surface of 20CrMo steel demonstrates good tribological and anti-cavitation erosive properties. It can effectively replace CuPb24Sn copper alloy in valve plates for pumps under different lubrication conditions. The coating exhibits adhesive wear and reduces frictional loss, and mainly shows abrasive wear under complex working conditions. Its lipophilicity, high hardness to elastic modulus ratio, and corrosion resistance are the main influencing factors for its performance.
Article
Engineering, Mechanical
Md. Aminul Islam, Jiaren (Jimmy) Jiang, Yongsong Xie
Summary: Erosion-corrosion is a major factor in material loss and reduced useful life of hydro-transport equipment. This study evaluates the erosion-corrosion characteristics of different materials and finds that matrix wear affects the degradation of carbides. Sufficient wear and corrosion resistance in the surrounding matrix are important for good erosion-corrosion resistance.
Article
Engineering, Mechanical
Andre Dubois, Oussama Filali, Laurent Dubar
Summary: This study investigates the effect of surface roughness, contact pressure, and lubrication on the onset of galling in aluminum 6082-T6 using a pin-on-plate tribometer. The experimental results show that the roughness and lubricants play a significant role in preventing galling.
Article
Engineering, Mechanical
Jizhan Wu, Peitang Wei, Guoqiang Liu, Difa Chen, Xiuhua Zhang, Taimin Chen, Huaiju Liu
Summary: This study conducted a comprehensive evaluation of the DLC coating treatment on the loading capacity of gears and characterized the surface features and fatigue performance. The results demonstrate that DLC coating significantly improves the hardness and surface residual compressive stress of the gears, as well as enhances their contact fatigue performance.
Article
Engineering, Mechanical
Yangping Liu, Hwaran Lee, Annsley Mace, Jeremy L. Gilbert
Summary: An AFM-based single asperity tribology method was used to investigate the wear performance of carbides and base metal matrix in high carbon CoCrMo alloy. The wear behavior of the two types of carbides was stress-dependent and influenced by chemical composition. Cr-rich carbides exhibited higher wear resistance compared to Mo-rich carbides.
Article
Engineering, Mechanical
Zdenek Riha, Michal Zelenak, Akash Nag, Jakub Poloprudsky, Tomas Kruml, Sergej Hloch
Summary: This study investigates the erosion performances of a high-speed modulated jet (MWJ) and continuous water jet (CWJ). By comparing different nozzles and water jet powers, the effects of modulated and continuous jets on aluminum alloy were studied. The results show that under certain conditions, modulated jet can create deeper and sharper grooves while reducing the impact of lateral flow.
Article
Engineering, Mechanical
Chunyu Yu, Weipu Li, Yang Guo, Xianbin Sun, Fanli Hong, Ning Sun, Qinghai Zhang
Summary: This study explores the relationship between the wear rate of train brake pads and its features, and proposes a method for predicting the wear rate suitable for small sample data. Grey relational analysis and Pearson correlation analysis are used to determine the preferred features that affect the wear rate, and a BOA-BP model is established for prediction. The results show that BOA-BP exhibits better advantages in prediction with small samples.
Article
Engineering, Mechanical
Shan Yin, Xin Zhao, Shuangchao Huang, Zefeng Wen, Xuesong Jin
Summary: This study simulated the rolling contact of a driving wheelset over tangent and curved tracks at a speed up to 500 km/h using an explicit finite element approach to derive creep curves. The comparison between quasi-steady curves and transient curves in the presence of rail corrugation helped to identify cases where traditional theories are inapplicable and where transient effects must be considered. Additionally, the study further analyzed the influence of middle/high-frequency vibrations in the presence of rail corrugation.
Article
Engineering, Mechanical
Jiyao Zhang, Yuanlie Yu, Junlei Tang, Yingying Wang, Honggang Sun, Kaikai Song, Jianhong Gong, Pingping Liu, Xiaoming Liu, Lina Hu, Parthiban Ramasamy, Juergen Eckert
Summary: The influence of high-carbon addition on the microstructure, hardness, and wear behavior of CoCrNi alloy was investigated. It was found that the addition of carbon resulted in the formation of carbide particles, enhancing the hardness and improving the wear resistance. Fracture and detachment of hard carbides during friction introduced additional abrasive particles, transitioning the wear mechanism from adhesive-dominated to abrasive-dominated.
Article
Engineering, Mechanical
Yanfei Liu, Shengtao Yu, Ruize Zhang, Xiangyu Ge, Wenzhong Wang
Summary: This study reports the tribological behavior of nanodiamond plate (NDPL) as a nanoadditive for the first time and compares it with nanodiamond particles (NDPA). The results show that NDPL provides better lubrication performance at higher concentrations, and the sliding between NDPLs and the structural transformation from sp3 to sp2 carbon play a crucial role in lubrication and wear resistance.
