Download or read book A Study of the Mechanical Behavior of OFHC Copper in Tension at Various Strain Rates and Heating Rates Using the Two Dimensional Integrated Speckle Measuring System written by and published by . This book was released on 2000 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective was to investigate the mechanical behavior of oxygen-free high-conductivity (OFHC) copper in tension. A modified dog bone specimen was heated using resistive heating techniques. The effects of high temperature, medium strain rates, and high heating rates on the stress-strain results were observed. A new two-dimensional (2-D) integrated speckle measuring system and a high-speed optical pyrometer were utilized for strain and temperature measurements. Room temperature tests were conducted at strain rates of quasi-static and 1/s. The high heating rate experiments were conducted at temperatures of 360 deg C and 375 deg C, heating rates of 30 degrees C/s and 263 degrees C/s, and at a strain rate of 1/s. A nominal decrease in the elastic modulus and an increase in the elastic limit are seen for increasing strain rate. Decreases in yield stress and flow stress were observed as the heating rate was increased.
Download or read book Measurements of Dynamic Properties of Materials Volume 5 OFHC Copper written by Douglas R. Christman and published by . This book was released on 1971 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of an experimental study on the dynamic properties of OFHC copper (1/2-hard) are presented. Areas studied included stress-strain-strain rate and reverse loading behavior, elastic constants, equation of state, compressive and release wave characteristics, and spall fracture. The material showed approximately elastic-perfectly plastic behavior under uniaxial stress compression with slight rate sensitivity (0.005 to 950/sec strain rates and 20, 204 and 370C). Longitudinal and shear wave velocities at 20C were 4.757 and 2. 247 mm/microsec, and temperature and pressure dependence was also measured and various elastic constants were calculated. The shock wave equation of state (EOS) was measured from 10 to 200 kbars as sigma-H = 1.5 + 344 u sub p + 143 u sub p to the 2nd power. The EOS was also calculated from the elastic constants and comparisons made with the shock wave EOS. Compressive wave tests showed a ramped, non-steady-state elastic precursor with very rapid decay (> 80% in 2 mm) . The yield level from compressive wave profile measurements was considerably lower than that determined from uniaxial stress and EOS tests. Shock wave profiles showing both release wave behavior and attenuation were obtained. The impact velocity required for spall fracture was found to increase with decreasing pulse width.
Download or read book Crystal Plasticity Finite Element Methods written by Franz Roters and published by John Wiley & Sons. This book was released on 2011-08-04 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by the leading experts in computational materials science, this handy reference concisely reviews the most important aspects of plasticity modeling: constitutive laws, phase transformations, texture methods, continuum approaches and damage mechanisms. As a result, it provides the knowledge needed to avoid failures in critical systems udner mechanical load. With its various application examples to micro- and macrostructure mechanics, this is an invaluable resource for mechanical engineers as well as for researchers wanting to improve on this method and extend its outreach.
Download or read book The Mechanical Properties of Copper at High Strain Rates Volume I the Effect of Strain Rate on the Flow Stress of Copper written by J. D. Lubahn and published by . This book was released on 1966 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental method of determining dynamic flow stress where the stress is homogeneous is developed using a pendulum bar suspension system. A small specimen is mounted on the end of one of the bars and the other bar is impacted on the free and of the specimen. For copper, the dynamic stress is 29% larger than the static stress for a strain rate of about 100/sec (or an increase in strain rate of about 5 orders of magnitude). For various tests, the increase in dynamic stress over the static value varied from 17% to 45%. This variation is comparable with the expected scatter for a typical test (plus or minus 10%) predicted from the uncertainties in measurement. (Author).
Download or read book Strain Rate Effects on Ultimate Strain of Copper written by and published by . This book was released on 1979 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: The strain-rate effect on strain to failure of copper was experimentally investigated. Both Oxygen Free High Conductivity (OFHC) copper and Electrolytic Tough Pitch (ETP) copper were studied. Ultimate strains were measured for a range of strain rates from 0.0001 strain/second to over 10000.0 strain/second. Normal quasi-static tensile machines were used at low strain rates, a split Hopkinson bar apparatus was used at strain rates of 1000.0 strain/second, and an exploding tube technique was developed for strain rates to over 10000.0 strain/second. High speed photographic techniques and post shot fragment analysis were used to determine the strain rate effects. Copper shows little strain rate dependence below 1000.0 strain/second with average ultimate strains around 0.4. Above approximately 5000.0 strain/second, several geometrical and material related factors cause the average ultimate strain to increase to values above 1.3, due to suppression of necking in the material until very late in the straining process. OFHC copper and ETP copper behave much the same to strain rates of 10000.0 strain/second.
Download or read book Pressure shear Impact Investigation of Strain rate History Effects in OFHC Copper written by Wei Tong and published by . This book was released on 1991 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Springer Handbook of Experimental Solid Mechanics written by William N. Sharpe, Jr. and published by Springer Science & Business Media. This book was released on 2008-12-04 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Springer Handbook of Experimental Solid Mechanics documents both the traditional techniques as well as the new methods for experimental studies of materials, components, and structures. The emergence of new materials and new disciplines, together with the escalating use of on- and off-line computers for rapid data processing and the combined use of experimental and numerical techniques have greatly expanded the capabilities of experimental mechanics. New exciting topics are included on biological materials, MEMS and NEMS, nanoindentation, digital photomechanics, photoacoustic characterization, and atomic force microscopy in experimental solid mechanics. Presenting complete instructions to various areas of experimental solid mechanics, guidance to detailed expositions in important references, and a description of state-of-the-art applications in important technical areas, this thoroughly revised and updated edition is an excellent reference to a widespread academic, industrial, and professional engineering audience.
Download or read book Magnetic Fusion Technology written by Thomas J. Dolan and published by Springer Science & Business Media. This book was released on 2014-02-10 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic Fusion Technology describes the technologies that are required for successful development of nuclear fusion power plants using strong magnetic fields. These technologies include: • magnet systems, • plasma heating systems, • control systems, • energy conversion systems, • advanced materials development, • vacuum systems, • cryogenic systems, • plasma diagnostics, • safety systems, and • power plant design studies. Magnetic Fusion Technology will be useful to students and to specialists working in energy research.
Download or read book Metal Forming written by William F. Hosford and published by Cambridge University Press. This book was released on 2011-02-07 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book helps the engineer understand the principles of metal forming and analyze forming problems - both the mechanics of forming processes and how the properties of metals interact with the processes. In this fourth edition, an entire chapter has been devoted to forming limit diagrams and various aspects of stamping and another on other sheet forming operations. Sheet testing is covered in a separate chapter. Coverage of sheet metal properties has been expanded. Interesting end-of-chapter notes have been added throughout, as well as references. More than 200 end-of-chapter problems are also included.
Download or read book Spall Fracture written by Tarabay Antoun and published by Springer Science & Business Media. This book was released on 2006-04-06 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock-induced dynamic fracture of solids is of practical importance in many areas of materials science, chemical physics, engineering, and geophysics. This book, by an international roster of authors, comprises a systematic account of the current state of research in the field, integrating the large amount of work done in the former Soviet Union with the work done in the West. Topics covered include: Wave propagation, experimental techniques and measurements, spallation of materials of different classes (metals, ceramics, glasses, polymers), constitutive models of fracture processes, and computer simulations.
Download or read book Fabrication of Complex Optical Components written by Ekkard Brinksmeier and published by Springer Science & Business Media. This book was released on 2012-09-13 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: High quality optical components for consumer products made of glass and plastic are mostly fabricated by replication. This highly developed production technology requires several consecutive, well-matched processing steps called a "process chain" covering all steps from mold design, advanced machining and coating of molds, up to the actual replication and final precision measurement of the quality of the optical components. Current market demands for leading edge optical applications require high precision and cost effective parts in large volumes. For meeting these demands it is necessary to develop high quality process chains and moreover, to crosslink all demands and interdependencies within these process chains. The Transregional Collaborative Research Center "Process chains for the replication of complex optical elements" at Bremen, Aachen and Stillwater worked extensively and thoroughly in this field from 2001 to 2012. This volume will present the latest scientific results for the complete process chain giving a profound insight into present-day high-tech production.
Download or read book Towards Synthesis of Micro Nano systems written by Fumihiko Kimura and published by Springer. This book was released on 2007 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of papers, presented at the 11th International Conference on Precision Engineering, offers a broader global perspective on the challenges and opportunities ahead. The discussion encompasses leading-edge technologies and forecasts future trends. Coverage includes advanced manufacturing systems; ultra-precision- and micro-machining; nanotechnology for fabrication and measurement; rapid prototyping and production technology; new materials and advanced processes; computer-aided production engineering; manufacturing process control; production planning and scheduling, and much more.
Download or read book Emergent States in Photoinduced Charge Density Wave Transitions written by Alfred Zong and published by Springer Nature. This book was released on 2021-09-17 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book advances understanding of light-induced phase transitions and nonequilibrium orders that occur in a broken-symmetry system. Upon excitation with an intense laser pulse, materials can undergo a nonthermal transition through pathways different from those in equilibrium. The mechanism underlying these photoinduced phase transitions has long been researched, but many details in this ultrafast, non-adiabatic regime still remain to be clarified. The work in this book reveals new insights into this phenomena via investigation of photoinduced melting and recovery of charge density waves (CDWs). Using several time-resolved diffraction and spectroscopic techniques, the author shows that the light-induced melting of a CDW is characterized by dynamical slowing-down, while the restoration of the symmetry-breaking order features two distinct timescales: A fast recovery of the CDW amplitude is followed by a slower re-establishment of phase coherence, the latter of which is dictated by the presence of topological defects in the CDW. Furthermore, after the suppression of the original CDW by photoexcitation, a different, competing CDW transiently emerges, illustrating how a hidden order in equilibrium can be unleashed by a laser pulse. These insights into CDW systems may be carried over to other broken-symmetry states, such as superconductivity and magnetic ordering, bringing us one step closer towards manipulating phases of matter using a laser pulse.
Download or read book Electronic Imaging in Astronomy written by Ian S. McLean and published by Springer Science & Business Media. This book was released on 2008-08-17 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of Electronic Imaging in Astronomy: Detectors and Instrumentation describes the remarkable developments that have taken place in astronomical detectors and instrumentation in recent years – from the invention of the charge-coupled device (CCD) in 1970 to the current era of very large telescopes, such as the Keck 10-meter telescopes in Hawaii with their laser guide-star adaptive optics which rival the image quality of the Hubble Space Telescope. Authored by one of the world’s foremost experts on the design and development of electronic imaging systems for astronomy, this book has been written on several levels to appeal to a broad readership. Mathematical expositions are designed to encourage a wider audience, especially among the growing community of amateur astronomers with small telescopes with CCD cameras. The book can be used at the college level for an introductory course on modern astronomical detectors and instruments, and as a supplement for a practical or laboratory class.
Download or read book High Sensitivity Moir written by Daniel Post and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: A description of both the theory and practice of physical measurements that use high-sensitivity moiré - principally moiré interferometry. The focus here is on the mechanics and micromechanics of materials and structural elements and the book includes new studies published for the first time. Diverse fields are addressed: advanced composite materials, thermal stresses, electronic packaging, fracture, metallurgy, time-dependence, strain gage calibration. All the methods can be applied for whole-field measurements on nearly and solid bodies. This reader-friendly book will serve engineers and scientists who are concerned with measurements of real phenomena, while also stimulating students to pursue the treasures of experimental analysis.
Download or read book Characterization of Minerals Metals and Materials 2016 written by Shadia Ikhmayies and published by John Wiley & Sons. This book was released on 2016-02-09 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: Characterization is an important and fundamental step in material research before and after processing. This bookfocuses on the characterization of minerals, metals, and materials as well as the application of characterization results on the processing of these materials. It is a highly authoritative collection of articles written by experts from around the world. The articles center on materials characterization, extraction, processing, corrosion, welding, solidification, and method development. In addition, articles focus on clays, ceramics, composites, ferrous metals, non-ferrous metals, minerals, electronic, magnetic, environmental, advanced and soft materials. This book will serve the dual purpose of furnishing a broad introduction of the field to novices while simultaneously serving to keep subject matter experts up-to-date.
Download or read book Fractography and Failure Analysis written by Jorge Luis González-Velázquez and published by Springer. This book was released on 2018-03-19 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents fractography and failure analysis at a level that is accessible for non-expert readers, without losing scientific rigor. It offers a comprehensive description of fracture surfaces in engineering materials, with an emphasis on metals, and of the methodology for the observation of fracture surfaces. It also discusses in detail the main fracture mechanisms and their corresponding fracture surfaces, including brittle, ductile, fatigue, and environmental fractures. The last chapter is dedicated to the use of fractography in determining of the causes component failure. In modern engineering, the analysis of fractured components is a common practice in many fields, such as integrity management systems, materials science research, and failure investigations. As such this book is useful for engineers, scientists, engineering students, loss adjuster surveyors and any professional dealing with fractured components.
