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Fracture Studies In Silicon Crystals
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Book Synopsis Fracture Studies in Silicon Crystals by : S. Weissmann
Download or read book Fracture Studies in Silicon Crystals written by S. Weissmann and published by . This book was released on 1972 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: An X-ray diffraction method was developed to study the plastic and elastic strain distribution of a propagating crack in notched, wedge-shaped silicon crystals deformed by cantilever bending. The method is based on the disturbance of thickness contour fringes (Pendellosung fringes) of dynamically diffracting crystals by lattice defects, generated by the deformation process. The interaction of low-angle boundaries with the strain field emanting from the notch is described. (Author).
Book Synopsis Twinning and Fracture of Single Crystals of 3% Silicon Iron by : D. Hull
Download or read book Twinning and Fracture of Single Crystals of 3% Silicon Iron written by D. Hull and published by . This book was released on 1959 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chemical Effects on the Fracture of Single Crystal Silicon by : Daniel Forrest Thompson
Download or read book Chemical Effects on the Fracture of Single Crystal Silicon written by Daniel Forrest Thompson and published by . This book was released on 1989 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture Toughness of (100) P-type Single-crystal Silicon by : James G. Tomei
Download or read book Fracture Toughness of (100) P-type Single-crystal Silicon written by James G. Tomei and published by . This book was released on 1993 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture Anisotropy in Silicon Single Crystals by : Lakshman Kalwani
Download or read book Fracture Anisotropy in Silicon Single Crystals written by Lakshman Kalwani and published by . This book was released on 1994 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantitative Characterization of the Fracture Surface of Silicon Single Crystals by Confocal Microscopy by : Yun-Biao Xin
Download or read book Quantitative Characterization of the Fracture Surface of Silicon Single Crystals by Confocal Microscopy written by Yun-Biao Xin and published by . This book was released on 1995 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multi-paradigm Modeling of Mode I&II Dynamic Fracture Mechanisms in Single Crystal Silicon by : Alan Cohen (S. B.)
Download or read book Multi-paradigm Modeling of Mode I&II Dynamic Fracture Mechanisms in Single Crystal Silicon written by Alan Cohen (S. B.) and published by . This book was released on 2008 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: In addition to its semi-conducting properties, silicon has the ability to be manipulated with high precision at very small length- scales. This property makes it very useful in the design of Nano/Micro-Electromechanical Systems (N/MEMS) and similar technologies. The understanding of fracture of silicon is crucial for the engineering process and the development of robust devices. However, the mechanisms of fracture in silicon are complex and are still not fully understood. Several experimental studies of fracture have been reported, however, these often lack insight into atomistic mechanisms of fracture. Ab initio computational methods (e.g. based on Density Functional Theory) to study silicon that are able to provide a fundamental description of the complex fracture mechanisms remain an open challenge. In particular, the mechanisms that lead to brittle cleavage or to the transition to ductile behavior of silicon at higher temperatures remains an open question. Empirical molecular dynamics (MD) studies have proven successful in simulating silicon fracture, but are unreliable and most models could not be validated against experimental results. Here we propose to use MD modeling based on a novel first principles reactive force fields ReaxFF, which has shown to be an accurate model to describe fracture processes of silicon. Two numerical methods are used here to study fracture mechanisms in silicon: a multi-paradigm model employing reactive and non-reactive force fields, and a fully reactive model. The CMDF and GRASP are used for the simulation of brittle fracture mechanisms in mode I and mode II loading conditions, as well as simulations of the brittle-to-ductile transition (BDT). Our results indicate that CMDF is suitable for modeling silicon brittle fracture, but has limitations during the study of the mechanisms involved in the BDT. GRASP provides a suitable framework for BDT study, and the results in this study provide for the first time an observation of the BDT without the use of an empirical model. In this thesis we report, for the first time, the direct atomistic simulation of the BTD in silicon, revealing the microscopic atomistic mechanisms that explains this drastic change in the behavior of silicon.
Book Synopsis Test Methodologies for Dynamic Fracture Strength of Single Crystal Silicon by : Saifa Hasin
Download or read book Test Methodologies for Dynamic Fracture Strength of Single Crystal Silicon written by Saifa Hasin and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental and Molecular Dynamics Determination of Fractal Fracture in Single Crystal Silicon by : Yueh-Long Tsai
Download or read book Experimental and Molecular Dynamics Determination of Fractal Fracture in Single Crystal Silicon written by Yueh-Long Tsai and published by . This book was released on 1993 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Fracture of Brittle Materials by : Stephen W. Freiman
Download or read book The Fracture of Brittle Materials written by Stephen W. Freiman and published by John Wiley & Sons. This book was released on 2012-02-03 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supports the use and development of strong, fracture-resistant, and mechanically reliable ceramic materials The Fracture of Brittle Materials thoroughly sets forth the key scientific and engineering concepts underlying the selection of test procedures for fracture toughness, strength determination, and reliability predictions. With this book as their guide, readers can confidently test and analyze a broad range of brittle materials in order to make the best use of existing materials as well as to support the development of new materials. The authors explain the importance of microstructure in these determinations and describe the use of quantitative fractography in failure analysis. The Fracture of Brittle Materials is relevant to a broad range of ceramic materials (i.e., any inorganic non-metal), including semiconductors, cements and concrete, oxides, carbides, and nitrides. The book covers such topics as: Basic principles of fracture mechanics underlying brittle material tests and analysis procedures Theory and mechanisms of environmentally enhanced crack growth Fracture mechanics tests to determine a material's resistance to fast fracture Test and analysis methods to assess the strength of ceramics Methods to analyze the fracture process based on quantitative measurements of the fracture surface Effect of a material's microstructure Methods for predicting the lifetime of brittle components under stress Throughout the book, figures and illustrations help readers understand key concepts and methods. Replete with real-world examples, this text enables engineers and materials and ceramics scientists to select and implement the optimal testing methods for their particular research needs and then accurately analyze the results.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722301422 Total Pages :30 pages Book Rating :4.3/5 (14 download)
Book Synopsis Indentation Plasticity and Fracture in Silicon by : National Aeronautics and Space Administration (NASA)
Download or read book Indentation Plasticity and Fracture in Silicon written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-05 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the ductile-brittle transition temperature of heavily doped silicon were carried out using indentation techniques. Diamond pyramid hardness tests were performed on the (100) face of heavily doped N-type and P-type and intrinsic silicon single crystals. Tests were performed over the range 200 C to 850 C and loads of 100 to 500 g were used. Samples were subsequently etched to reveal dislocation rosettes produced by indentation. Intrinsic silicon underwent a ductile-brittle transition at 660 C, P-type at 645 C and N-type at 625 C. Hardness values varied from 1.1 GPa at 700 C to 11.7 GPa at 200 C. Significant effects of hardness on doping were present only at the highest temperatures. Lower loads generally produced higher hardness but load did not affect the Ductile-Brittle Transition Temperature (DBTT). Fracture toughness values ranged from 0.9 MPa m(1/2) at 200 C to 2.75 MPa m(1/2) near the DBTT. Doping did not affect the fracture toughness of silicon. P-type doping increased the size of dislocation rosettes observed after indentation, but N-type did not, in contradiction of the expected results. Results are discussed in terms of the effect of doping on the dislocation mobility in silicon. Rybicki, George C. and Pirouz, P. Glenn Research Center RTOP 505-63-1A...
Book Synopsis IUTAM Symposium on Mesoscopic Dynamics of Fracture Process and Materials Strength by : H. Kitagawa
Download or read book IUTAM Symposium on Mesoscopic Dynamics of Fracture Process and Materials Strength written by H. Kitagawa and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the papers presented at the IUT AM Symposium of "Mesoscopic Dynamics of Fracture Process and Materials Strength", held in July 2003, at the Hotel Osaka Sun Palace, Osaka, Japan. The Symposium was proposed in 2001, aiming at organizing concentrated discussions on current understanding of fracture process and inhomogeneous deformation governing the materials strength with emphasis on the mesoscopic dynamics associated with evolutional mechanical behaviour under micro/macro mutual interaction. The decision of the General Assembly of International Union of Theoretical and Applied Mechanics (IUT AM) to accept our proposal was well-timed and attracted attention. Driven by the development of new theoretical and computational techniques, various novel challenges to investigate the mesoscopic dynamics have been actively done recently, including large-scaled 3D atomistic simulations, discrete dislocation dynamics and other micro/mesoscopic computational analyses. The Symposium attracted sixty-six participants from eight countries, and forty two papers were presented. The presentations comprised a wide variety of fundamental subjects of physics, mechanical models, computational strategies as well as engineering applications. Among the subjects, discussed are (a) dislocation patterning, (b) crystal plasticity, (c) characteristic fracture of amorphous/nanocrystal, (d) nano-indentation, (e) ductile-brittle transition, (f) ab-initio calculation, (g) computational methodology for multi-scale analysis and others.
Download or read book Research in Progress written by and published by . This book was released on 1971 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical and Experimental Studies of Flow and Fracture in Monocrystalline Silicon by : Charles Falding St. John
Download or read book Theoretical and Experimental Studies of Flow and Fracture in Monocrystalline Silicon written by Charles Falding St. John and published by . This book was released on 1971 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies of Dislocations and Crystal Growth, Cleavage Fracture of Crystals, the Metal Physics of Stress Corrosion, the Effects of Ionizing Radiations on Ionic Crystals and the Ultra Violet Microscopy of Metals by :
Download or read book Studies of Dislocations and Crystal Growth, Cleavage Fracture of Crystals, the Metal Physics of Stress Corrosion, the Effects of Ionizing Radiations on Ionic Crystals and the Ultra Violet Microscopy of Metals written by and published by . This book was released on 1967 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781720213000 Total Pages :26 pages Book Rating :4.2/5 (13 download)
Book Synopsis Delayed Fracture of Silicon: Silicon Sheet Growth Development for the Large Area Silicon Sheet Task of the Low Cost Silicon Solar Array Project by : National Aeronautics and Space Adm Nasa
Download or read book Delayed Fracture of Silicon: Silicon Sheet Growth Development for the Large Area Silicon Sheet Task of the Low Cost Silicon Solar Array Project written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-10 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bar specimens were cut from ingots of single crystal silicon, and acid etched prior to testing. Artificial surface flaws were introduced in specimens by indentation with a Knoop hardness tester. The specimens were loaded in four-point bending to 95 percent of the nominal fracture stress, while keeping the surface area, containing the flaw, wet with test liquids. No evidence of delayed fracture, and, therefore stress corrosion, of single crystal silicon was observed for liquid environments including water, acetone, and aqueous solutions of NaCl, NH4OH, and HNO3, when tested with a flaw parallel to a (110) surface. The fracture toughness was calculated. Chen, T. J. and Knapp, W. J. Unspecified Center NASA-CR-157313 NAS7-100; JPL-954836
Book Synopsis Wear of Single-crystal Silicon Carbide in Contact with Various Metals in Vacuum by : Kazuhisa Miyoshi
Download or read book Wear of Single-crystal Silicon Carbide in Contact with Various Metals in Vacuum written by Kazuhisa Miyoshi and published by . This book was released on 1978 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sliding friction experiments were conducted in vacuum with single-crystal silicon carbide (0001) surface in contact with transition metals (tungsten, iron, rhodium, nickel, titanium, and cobalt), copper, and aluminum. The hexagon-shaped cracking and fracturing of silicon carbide that occurred is believed to be due to cleavages of both the prismatic and basal planes. The silicon carbide wear debris, which was produced by brittle fracture, slides or rolls on both the metal and silicon carbide and produces grooves and indentations on these surfaces. The wear scars of aluminum and titanium, which have much stronger chemical affinity for silicon and carbon, are generally rougher than those of the other metals. Fracturing and cracking along the grain boundary of rhodium and tungsten were observed. These may be primarily due to the greater shear moduli of the metals.
