Download or read book Ductile Regime Machining of Silicon Nitride written by Satya K. Ajjarapu and published by . This book was released on 2000 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Numerical Studies on Ductile Regime Machining of Silicon Carbide and Silicon Nitride written by Ravishankar Mariayyah and published by . This book was released on 2003 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of Ductile Machining of Silicon Nitride written by Thimmaiah Ganapathi Kumbera and published by . This book was released on 2001 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Machining of brittle materials presently involves time consuming operations such as grinding and polishing. Recent work has introduced ductile regime machining as a viable alternative to existing finishing operations in machining of brittle materials. In this work, the mechanics of ductile machining of Silicon Nitride (Si3N4) with a single point cutting tool is studied. Experimental work was carried out to determine the mode of material removal during the process. The main objective of the experimental study was to obtain the threshold values of the machining parameters for ductile machining. Surface analysis for possible fracture and chip morphology was also carried out. The orthogonal cutting process is modeled using the finite element analysis software ADVANTEDGE. Various conditions of temperatures, pressures and stresses that are conducive to ductile material removal are studied via parametric study of the effects of machining parameters on the process.
Download or read book Experimental and Numerical Analyses of Ductile Regime Machining of Silicon Nitride written by Satya Kumar Ajjarapu and published by . This book was released on 2004 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developments in precision machining technology have shown that ductile regime machining of advanced ceramics such as Silicon Nitride (Si[subscript]3N[subscript]4) is possible under controlled cutting conditions. In the present work, the mechanics of ductile regime machining of silicon nitride at micron level depths was studied experimentally and numerically. Machining tests were carried out for depths of cut ranging from 250 nm to 10 [mu]m on Diamond Turning Machine (DTM). Force and surface roughness data collected from diamond turning of silicon nitride samples were presented. Chip morphology studies were also carried out using Scanning Electron Microscopy (SEM) for the machined samples. The mechanical behavior of silicon nitride is treated using the Drucker-Prager yield criterion and implemented in the commercial machining software AdvantEdge. Numerical simulations were conducted for depths of cut ranging from 1 [mu]m to 40 [mu]m and at rake angles from 0[superscript]o to -60[superscript]o. Pressure distribution at the tool and workpiece interface for different depths of cut and rake angles was studied. Experimental results were correlated with the numerical results for -5[superscript]o and -45[superscript]o rake angles.
Download or read book Ductile regime Machining of Silicon Carbide and Quarts written by Deepak Ravindra and published by . This book was released on 2007 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Machinability of Advanced Materials written by J. Paulo Davim and published by John Wiley & Sons. This book was released on 2014-02-19 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Machinability of Advanced Materials addresses the level of difficulty involved in machining a material, or multiple materials, with the appropriate tooling and cutting parameters. A variety of factors determine a material’s machinability, including tool life rate, cutting forces and power consumption, surface integrity, limiting rate of metal removal, and chip shape. These topics, among others, and multiple examples comprise this research resource for engineering students, academics, and practitioners.
Download or read book Precision Engineering written by M. V. Suryaprakash and published by Alpha Science Int'l Ltd.. This book was released on 2004 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current focus of manufacturing is towards flexible automation and miniaturization.
Download or read book Diamond Turning of Silicon Nitride written by Ronnie Rex Fesperman and published by . This book was released on 2004 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes experimental work carried out to study the ability to ductile single point diamond turn both Ceradyne's Ceralloy 147-31N and Allied Signal's GS-44 silicon nitride (Si[subscript]3N[subscript]4) and the effect single point diamond turning has on the strength of GS-44 Si[subscript]3N[subscript]4. The Nanocut II nanometric cutting instrument was first employed to determine if the critical depth of cut, corresponding to a ductile to brittle transition, for 147-31N Si[subscript]3N[subscript]4 was within the nanometric regime. A Precitech Nanoform 350 diamond turning machine was then employed to determine the limits of ductile regime machining at larger depths of cut for 147-3 IN and GS-44 Si[subscript]3N[subscript]4 . An investigation into the ability to diamond turn Si[subscript]3N[subscript]4 with both single crystal and polycrystalline diamond tools was performed. 140 GS-44 rectangular flexural bar test specimens in four sample sets of 35 specimens each were prepared by diamond turning with polycrystalline diamond tools at depths of 250 nm, 500 nm, 5 [mu]m, and 10 [mu]m. Four-point flexure testing was performed on the diamond turned flexure bars as well as flexure bars prepared by grinding to assess the effect single point polycrystalline diamond turning has on the strength of GS-44 Si[subscript]3N[subscript]4 in comparison to grinding. Fractography was carried out to identify the origin of failure of each specimen and Weibull statistical analysis was used to characterize the strength distribution for each machining condition. Finally, the effect of negative rake angle and rate of tool wear of single crystal diamond tools was studied by diamond turning thin disks of GS-44 Si[subscript]3N[subscript]4.
Download or read book Ductile Regime Nano machining of Silicon Carbide written by Biswarup Bhattacharya and published by . This book was released on 2005 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Cutting Mechanics in Single Point Diamond Turning of Silicon written by Amir Mir and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a kind of brittle material, silicon will undergo brittle fracture at atmospheric pressure in conventional scale machining. Studies in the last two decades on hard and brittle materials including silicon, germanium, silicon nitride and silicon carbide have demonstrated ductile regime machining using single point diamond turning (SPDT) process. The mirror-like surface finish can be achieved in SPDT provided appropriate tool geometry and cutting parameters including feed rate, depth of cut and cutting speed are adopted.The research work in this thesis is based on combined experimental and numerical smoothed particle hydrodynamics (SPH) studies to provide an inclusive understanding of SPDT of silicon. A global perspective of tool and workpiece condition using experimental studies along with localized chip formation and stress distribution analysis using distinctive SPH approach offer a comprehensive insight of cutting mechanics of silicon and diamond tool wear. In SPH modelling of SPDT of silicon, the distribution of von Mises and hydrostatic stress at incipient and steady-state was found to provide the conditions pertinent to material failure, phase transformation, and ductile mode machining. The pressure-sensitive Drucker Prager (DP) material constitutive model was adopted to predict the machining response behaviour of silicon during SPDT. Inverse parametric analysis based on indentation test was carried out to determine the unknown DP parameters of silicon by analysing the loading-unloading curve for different DP parameters. A very first experimental study was conducted to determine Johnson-Cook (J-C) model constants for silicon. High strain rate compression tests using split Hopkinson pressure bar (SHPB) test as well as quasi-static tests using Instron fatigue testing machine were conducted to determine J-C model constants.The capability of diamond tools to maintain expedient conditions for high-pressure phase transformation (HPPT) as a function of rake angle and tool wear were investigated experimentally as well as using SPH approach. The proportional relationship of cutting forces magnitude and tool wear was found to differ owing to wear contour with different rake angles that influence the distribution of stresses and uniform hydrostatic pressure under the tool cutting edge. A new quantitative evaluation parameter for the tool wear resistance performance based on the cutting distance was also proposed. It was also found that the machinability of silicon could be improved by adopting novel surface defect machining (SDM) method.The ductile to brittle transition (DBT) with the progressive tool wear was found to initiate with the formation of lateral cracks at low tool wear volume which transform into brittle pitting damage at higher tool edge degradation. A significant variation in resistance to shear deformation as well as position shift of the maximum stress values was observed with the progressive tool wear. The magnitude and distribution of hydrostatic stress were also found to change significantly along the cutting edge of the new and worn diamond tools.
Download or read book Ductile Regime Machining of Silicon Using a Nano Precision Machine Tool written by Don Gerry Nishan Vasantha Bopearatchy and published by . This book was released on 2001 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Machining of Ceramics and Composites written by Jahanmir and published by CRC Press. This book was released on 1999-01-04 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting modern advances in the machining of ceramics and composites, this work offers broadly based, fundamental information for selecting the appropriate machining processes and parameters, developing successful manufacturing strategies, and designing novel machining systems. It focuses on scientific and engineering developments affecting the present and future of machining processes.
Download or read book Journal of Research of the National Institute of Standards and Technology written by and published by . This book was released on 1994 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports NIST research and development in the physical and engineering sciences in which the Institute is active. These include physics, chemistry, engineering, mathematics, and computer sciences. Emphasis on measurement methodology and the basic technology underlying standardization.
Download or read book Proceedings of the 7th International Conference on Nanomanufacturing nanoMan2021 written by Shuming Yang and published by Springer Nature. This book was released on 2022-04-15 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a compilation of selected papers from the 7th International Conference on Nanomanufacturing (nanoMan2021), held in Xi’an on November 17-19, 2021 after postponing twice due to COVID-19 pandemic. It encompasses the synthesis of nanomaterials, the fabrication of devices, the characterization of various products and systems, process monitoring and quality control, simulations, and the applications of nanoscience and nanotechnologies.
Download or read book Properties and Applications of Silicon Carbide written by Rosario Gerhardt and published by BoD – Books on Demand. This book was released on 2011-04-04 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, we explore an eclectic mix of articles that highlight some new potential applications of SiC and different ways to achieve specific properties. Some articles describe well-established processing methods, while others highlight phase equilibria or machining methods. A resurgence of interest in the structural arena is evident, while new ways to utilize the interesting electromagnetic properties of SiC continue to increase.
Download or read book Wafer Manufacturing written by Imin Kao and published by John Wiley & Sons. This book was released on 2021-01-05 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting all the major stages in wafer manufacturing, from crystals to prime wafers. This book first outlines the physics, associated metrology, process modelling and quality requirements and the goes on to discuss wafer forming and wafer surface preparation techniques. The whole is rounded off with a chapter on the research and future challenges in wafer manufacturing.
Download or read book Ductile Mode Cutting of Brittle Materials written by Kui Liu and published by Springer Nature. This book was released on 2019-10-12 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a systematic and comprehensive interdisciplinary overview of ductile mode cutting of brittle materials, covering a range of topics from the fundamental physics to engineering practices. Discussing the machining mechanics and material properties, it explains the fundamental mechanism of ductile-to-brittle transition in the cutting of brittle materials. It also presents theoretical modeling and molecular dynamic simulation to demonstrate that ductile mode cutting can be achieved under certain conditions, as well as extensive experimental studies that produced smooth and damage-free surfaces on different materials, such as silicon, glass, tungsten carbide and calcium fluoride. Lastly, it explores how the ductile mode cutting performance and machinability of brittle materials can be further improved by hybrid machining processes like ultrasonic vibration and thermal-assisted cutting technologies in order to meet industry demands.
