Article
Materials Science, Ceramics
Ella Walter, Andrea Gommeringer, Frank Kern
Summary: Composites of yttria-neodymia co-stabilized zirconia with nanoscale tungsten carbide and alumina addition were manufactured and characterized. Alumina addition increased hardness and Young's modulus, and slightly increased bending strength. However, it reduced the transformability of the zirconia matrix and fracture toughness. In EDM, alumina reduced re-solidified layer thickness, surface defects, and improved surface smoothness, but had negligible effect on material removal rate.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Automation & Control Systems
Guisen Wang, Fuzhu Han
Summary: The study shows that there are differences in surface integrity between single-step and multi-step machined samples in electrical discharge machining, with multi-step machined samples having higher surface roughness, white layer thickness, and surface residual stress. These differences become even larger in the finishing stage.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Hanieh Azimi, Salman Nourouzi, Roohollah Jamaati
Summary: The study investigated the effects of Ti powder addition and T6 heat treatment on the microstructure and mechanical properties of A356-based composites. It was found that the addition of Ti led to changes in silicon nucleation, size, and porosity, with the T6 heat treatment transforming the eutectic Si structure. The composite with 0.5 wt% Ti showed the highest ultimate tensile strength among all samples, with improvements in hardness and tensile strength compared to the A356 alloy attributed to the presence of Ti and Al3Ti phases. The fracture surface of the A356/Ti composites was mainly covered by cleavage features.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Chemical
Muhammad Umar Farooq, Saqib Anwar
Summary: The study investigates the potential of cryogenic-treated tool electrodes with modified and unmodified dielectrics in electric discharge machining of Ti6Al4V. Statistical analyses based on full factorial design of experiments are performed, and the cutting mechanism is found to be highly dependent on the surfactants in the dielectric. The desirability-based process optimization reveals that the modified process with surfactant yields lower roughness on the workpiece compared to the unmodified process, with the S-60 surfactant achieving the best results.
Article
Engineering, Multidisciplinary
Sanghamitra Das, Shrikrishna Nandkishor Joshi
Summary: This study experimentally investigated the erosion of molybdenum wire after WEDM of Ti-6Al-4V alloy at various input levels, estimating a wire surface quality index using image processing technique and analyzing the correlation between wear intensity and workpiece quality through the mean of wire image histogram. Results showed that as the mean of image histogram decreases, the intensity of wire surface erosion increases.
Article
Automation & Control Systems
Douyan Zhao, Hao Zhu, Zhaoyang Zhang, Kun Xu, Jian Gao, Xueren Dai, Lei Huang
Summary: Electrochemical Discharge Machining (ECDM) is a nontraditional processing technology that can precisely process glass and engineering ceramics, making it a potential process for creating glass 3D microstructures. Research on ECDM focused on improving machining accuracy through exploring the effects of power voltage and frequency on hole processing efficiency, entrance diameter, and limit depth, as well as studying factors like tool electrode feed rate and rotation speed. Results showed that various parameters have significant impacts on ECDM processes, with voltage positively affecting micro-hole machining and roughness, while frequency and electrode speed had negative correlations with surface roughness.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
Nihal Ekmekci, Yasin Efe
Summary: This study investigates the deposition of hydroxyapatite on the modified surface of titanium alloy using hydroxyapatite powder mixed electrical discharge machining (HA-PMEDM). The effects of different process parameters on surface roughness, surface topography, and powder deposition were evaluated. The results show that the highest rate of hydroxyapatite deposition to the machined surface was observed when using a pulse current of 22 A and a pulse-on duration of 100 μs in micro additive dielectric liquid.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Automation & Control Systems
Yan Wang, Qingzhong Wang, Wei Xiong, Jianguo Liu, Yongxin Wang
Summary: The study introduces a novel successive removing model to predict kerf width and surface topography of Nickel-titanium shape memory alloy using magnetic field-assisted low-speed wire electrical discharge machining. Experimental results demonstrated that magnetic field assistance can effectively reduce surface roughness and improve kerf and surface quality of the workpiece.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Review
Thermodynamics
Wuyi Ming, Shengfei Zhang, Guojun Zhang, Jinguang Du, Jun Ma, Wenbin He, Chen Cao, Kun Liu
Summary: This study provides a systematic review of the progress in modelling the electrical discharge machining (EDM) process. It compares and analyzes the existing finite element method (FEM) models, molecular dynamics (MD) models, and flow field models, and suggests future research areas of interest.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Automation & Control Systems
Ferhat Ceritbinmez, Erdogan Kanca, Lokman Yunlu, Kunjal Patel, Mst Alpona Akhtar, Sundeep Mukherjee, Ali Gunen
Summary: In this study, HfNbTaTiZr high-entropy alloys were machined using wire electric discharge machining (WEDM), and the roughness of the surfaces and sections cut using WEDM was compared. The analysis showed that surface roughness (Ra) increased by approximately 0.75 μm due to the limited heat transfer capability of the dielectric fluid. Microcracks, voids, globules, craters, and debris were observed on the machined surfaces due to the sudden cooling of the dielectric liquid after melting and evaporation under intense heat.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Review
Materials Science, Multidisciplinary
Ya Lu, Peiyan Sun, Xiaohong Yang, Xudong Guo, Xiaoke Li, Wuyi Ming
Summary: Ultrahigh-temperature ceramic matrix composites have excellent properties and are widely used in national defense and aerospace fields. Traditional machining methods face challenges in achieving high precision. Nontraditional machining methods provide solutions and are the future direction for ultrahigh-temperature ceramic matrix composites. This paper summarizes recent nontraditional machining methods, compares their performances, discusses challenges, and predicts the future development of nontraditional machining methods for these composites.
Article
Engineering, Aerospace
Tianyu Geng, Zhengyang Xu, Chenxiang Zhang, Jin Ning
Summary: This study compares and analyzes the processing waveform characteristics of EDD and ECDD, and proposes a novel breakthrough detection method based on the variance signal of average voltage (VSAV) to increase machining stability and achieve fabrication without a recast layer. Experimental results show that the method achieves breakthrough detection with 100% accuracy in all tests and obtains the optimum overfeeding distances for hole angles of 0°, 30°, and 60°, realizing stable removal of the recast layer.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Article
Automation & Control Systems
Kashif Ishfaq, Muhammad Arif Mahmood, Ahmad Raza Khan, Mudassar Rehman
Summary: Electric discharge machining (EDM) is a popular non-conventional machining process. This study presents analytical models to accurately calculate the surface roughness and material removal rate based on multiple-craters geometry. The analysis shows that pulse energy and open voltage have significant effects on the depth and width of the craters.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Sahar Khaki-Davoudi, Salman Nourouzi, Hamed Jamshidi Aval
Summary: This study investigates the effects of compocasting parameters on the microstructure and mechanical properties of AA7075/Al3Ni composites, finding that the addition of nickel reinforcement significantly impacts the microstructure. Under optimal conditions, composites fabricated using compocasting exhibit enhanced mechanical properties.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Jacek Skiba, Mariusz Kulczyk, Sylwia Przybysz-Gloc, Monika Skorupska, Julita Smalc-Koziorowska, Mariusz Kobus, Kamil Nowak
Summary: This paper presents research on optimizing the unconventional plastic forming process of a copper alloy (CuCrZr) through hydrostatic extrusion (HE) and post-processing heat treatment. The study found that the post-processing treatment resulted in an improved microstructure, significantly increased hardness and strength, and maintained high electrical conductivity, thereby reducing electrode wear in the EDM process. The best results were obtained with a five-stage HE process combined with aging at 480 degrees C for 1 hour, reducing electrical discharge wear by over 50% compared to non-deformed copper electrodes.
Article
Thermodynamics
Pinku Debnath, K. M. Pandey
Summary: The study investigates the effect of modified ejector on detonation combustion wave propagation and propulsion thrust of liquid kerosene and gaseous hydrogen-air mixture. Simulation results show that the thrust force augmentation of hydrogen-air mixture is greater compared to liquid kerosene-air mixture, but the flame propagation velocity is faster for hydrogen-air combustion.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Aerospace
Lakka Suneetha, Pitambar Randive, K. M. Pandey
Summary: The study reveals that self-throttling significantly affects the combustion performance of a strut-based scramjet combustor, improving mixing efficiency and enhancing fuel combustion. Additionally, the key factor influencing performance is the distance of self-throttling from the inlet.
Article
Engineering, Multidisciplinary
Namrata Bordoloi, Krishna Murari Pandey, Kaushal Kumar Sharma
Summary: The study reveals that analyzing the supersonic combustor ramjet engine through a simulation model can effectively replicate experimental results. Different incoming Mach numbers result in varying combustion and mixing efficiencies. The maximum temperature rise is 2711.467 K, with maximum combustion and mixing efficiencies of 87.47% and 98.15% respectively.
MATHEMATICAL PROBLEMS IN ENGINEERING
(2021)
Article
Thermodynamics
Prince Kumar, Krishna Murari Pandey
Summary: A comprehensive numerical analysis was conducted to examine the transport characteristics of flow of Newtonian fluid inside a channel with a porous slab and internal wavy walls. It was found that heat transfer rate and pressure drop increase with rising Reynold number, Darcy number, and wavy wall's amplitude. Additionally, the enhancement ratio (ER) reaches its maximum value of 10.8 for Da = 10(-2) and Re = 1200.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2021)
Article
Engineering, Multidisciplinary
Akhileshwar Singh, Krishna Murari Pandey, Yogesh Singh
Summary: This study investigates the splitting dynamics of low-viscous fingers inside bifurcating channels through the manipulation of surface wettability. Numerical simulations reveal that the behavior of finger splitting depends on various parameters, including surface wettability, capillary number, viscosity ratio, and surface tension. The findings provide insights into biofluid mechanics and respiratory diseases such as COVID-19.
MATHEMATICAL PROBLEMS IN ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Durgesh Kumar Mishra, Sumit Bhowmik, Krishna Murari Pandey
Summary: This study discusses the thermal exploration of melting phenomena of beeswax-based phase change material of four different annulus shapes. Numerical investigation on composite-beeswax approach with metal oxide particles revealed improved melting rate and heat transfer. The type of metal oxide particles had minimal impact on melting rate and heat transfer, showing significant enhancements with their presence.
MATHEMATICAL PROBLEMS IN ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Dipak Debbarma, Krishna Murari Pandey, Abhishek Paul
Summary: This study investigates the enhancement of overall performance in heat sinks by using a double layer structure with protrusions and dimples. Comparisons between microsinks with protruded-dimpled bottom layer and microsinks with protruded-dimpled layers were made, with staggered arrangements showing superior overall performance. The heat sink with both layers protruded and dimpled was found to be optimal, offering excellent thermal performance.
MATHEMATICAL PROBLEMS IN ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Bandi Venkata Ramana Reddy, Saikat Ranjan Maity, Lokeswar Patnaik, Sunil Kumar, Krishna Murari Pandey
Summary: Al-6Si-18Pb alloy was fabricated using spray deposition method and warm rolling, and the microstructural change and mechanical properties were studied. The results showed that continuous and discontinuous dynamic recrystallisation occurred in the alloy after warm rolling, resulting in grain refinement. Furthermore, Pb atoms were homogeneously distributed in the Al matrix. The porosity and hardness of the samples were significantly affected after warm rolling.
ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES
(2022)
Article
Thermodynamics
Prince Kumar, Ritesh Dwivedi, K. M. Pandey
Summary: This study numerically investigates the impact of different Prandtl numbers on the thermo-hydraulic transport characteristics of a partial porous wavy channel for a laminar flow. The results show that increasing the Prandtl number and Reynolds number leads to an increase in the Nusselt number and enhancement ratio, while the performance factor deteriorates with increasing slab thickness. Additionally, the effect of different Darcy numbers was evaluated.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Prince Kumar, K. M. Pandey
Summary: This article investigates the effect of varying porous slab thicknesses and Darcy number on the thermohydraulic performance of corrugated channels. The results show that increasing the porous slab thickness and decreasing the Darcy number can enhance the thermal performance but reduce the hydraulic performance.
Article
Thermodynamics
Prince Kumar, Ritesh Dwivedi, Krishna Murari Pandey
Summary: Comprehensive numerical simulations are conducted to investigate the combined effect of three distinct passive techniques on thermo-hydraulic properties and entropy generation in three different wavy channels. It is found that the insertion of porous media between the corrugated walls enhances thermal performance, and the trapezoidal channel shows the highest enhancement by 90%.
HEAT TRANSFER ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Akhileshwar Singh, Deepak Kumar Singh, Yogesh Singh, Krishna Murari Pandey
Summary: This paper investigates the influence of viscosity ratio and surface wettability on immiscible viscous fingering instability within a rectangular channel. The findings reveal that higher viscosity ratios lead to increased displacement efficiency, while low viscosity ratios result in necking. The finger-shaped pattern splits into two parts at a wettability of 15 degrees, and no splitting occurs beyond this threshold. Furthermore, a transition from hydrophilic to superhydrophobic wettability abolishes necking and enhances displacement efficiency, with the instability shifting towards the left side.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2023)
Proceedings Paper
Materials Science, Multidisciplinary
Plabita Sonowal, K. M. Pandey, K. K. Sharma
Summary: Landing gear design is a crucial aspect in aircraft design, with shock absorbers being one of the key components that need to be carefully designed. This study focused on the structural analysis of a landing gear shock absorber model for the Boeing 787-8 in static conditions, with results showing that the high strength stainless steel model exhibited lower stress and deformation.
MATERIALS TODAY-PROCEEDINGS
(2021)
Proceedings Paper
Engineering, Mechanical
Lakka Suneetha, Pitambar R. Randive, Krishna Murari Pandey
ADVANCES IN MECHANICAL ENGINEERING, ICRIDME 2018
(2020)
Proceedings Paper
Engineering, Mechanical
Pritam Majumder, Krishna Murari Pandey, Nishikant Deshpande, Subhendu Maity
ADVANCES IN MECHANICAL ENGINEERING, ICRIDME 2018
(2020)
