Download or read book Stress Measurements with Ultrasound written by Stanford University. Ginzton Laboratory and published by . This book was released on 1977 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Longitudinal Rail Stress Measurement Using Ultrasound written by Yue Yang and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stress Echocardiography written by Eugenio Picano and published by Springer. This book was released on 2015-10-06 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt: This sixth edition is enriched by over 300 figures, 150 tables and a video-companion collecting more than 100 cases also presented in the format of short movies and teaching cartoons. This extensively revised and enlarged edition of this long-seller documents the very significant advances made since the fifth (2009) edition and is entirely written by Eugenio Picano, a pioneer in the field sharing his lifetime experience with the help of an international panel of 50 contributors from 22 countries representing some of the best available knowledge and expertise in their respective field. In a societal and economic climate of increasing pressure for appropriate, justified and optimized imaging, stress echocardiography offers the great advantages of being radiation-free, relatively low cost, and with a staggering versatility: we can get more (information) with less (cost and risk). For a long time, the scope and application of stress echo remained focused on coronary artery disease. In the last ten years, it has exploded in its breadth and variety of applications. From a black-and-white, one-fits-all approach (wall motion by 2D-echo in the patient with known or suspected coronary artery disease) now we have moved on to a omnivorous, next-generation laboratory employing a variety of technologies (from M-Mode to 2D and pulsed, continuous, color and tissue Doppler, to lung ultrasound and real time 3D echo, 2D speckle tracking and myocardial contrast echo) on patients covering the entire spectrum of severity (from elite athletes to patients with end-stage heart failure) and ages (from children with congenital heart disease to the elderly with low-flow, low-gradient aortic stenosis).
Download or read book Measurement of Stress in Bolts Using Resonant Ultrasound Spectroscopy written by and published by . This book was released on 2006 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrasonic Measurement of Stress Using Backscattered Ultrasound written by Mohamed Pauzi bin Ismail and published by . This book was released on 1981 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Detection of Residual Stress by Measurement of the Efficiency of the Electromagnetic Generation of Ultrasound written by R. B. Thompson and published by . This book was released on 1976 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Last year it was demonstrated that the efficiency of an electromagnetic transducer is quite sensitive to deformation in low carbon steel, and use of this effect as a nondestructive test for residual stress was proposed. This year several survey experiments designed to more fully define the phenomena have been performed. Basic mechanisms have been studied by comparing the responses of iron, nickel, and invar which represent three substantially different classes of magnetic behavior. Further experiments have been conducted in the technologically important low carbon steels which illustrate the extent to which the measurement is influenced by texture, direction of the stress field, and loads in excess of the yield stress. New stress sensitive parameters derived from the efficiency curves are reported.
Download or read book Nondestructive Evaluation of Stress Using Ultrasound and Pulsed Heat written by Wallace L. Anderson and published by . This book was released on 1989 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unique instrumentation was developed for high-precision time -resolved ultrasonic velocity measurement. Such instrumentation is not available commercially nor, as far as is known, has such a capability ever been developed previously. It has a significant potential for materials studies and possibly other areas as well, as for instance noninvasive biomedical applications. It was demonstrated that with such instrumentation, applied stress even of modest values can be detected at depths of at least 1 cm in aluminum. Furthermore, such detection was shown to be quantitative, i.e., the amplitude of the effect is proportional to stress magnitude, and its shape is responsive in the predicted manner to locality of the stress. In view of item 3, below, it is evident that this concept is a viable basis for nondestructive characterization of subsurface residual stress in metals. Methods for data inversion to obtain stress profiles from measured velocity were explored and it was found that two techniques give good results with simulated data and relatively large amounts of additive noise, namely: (a) generalized matrix inversion with constraints and (b) least mean squares parameter fitting. Keywords: Nondestructive evaluation; Ultrasonic sound; Pulsed heat; Acoustoelastic phenomenon; Metal stress. (jhd).
Download or read book Handbook of Residual Stress and Deformation of Steel written by George E. Totten and published by ASM International. This book was released on 2002 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Examines the factors that contribute to overall steel deformation problems. The 27 articles address the effect of materials and processing, the measurement and prediction of residual stress and distortion, and residual stress formation in the shaping of materials, during hardening processes, and during manufacturing processes. Some of the topics are the stability and relaxation behavior of macro and micro residual stresses, stress determination in coatings, the effects of process equipment design, the application of metallo- thermo-mechanic to quenching, inducing compressive stresses through controlled shot peening, and the origin and assessment of residual stresses during welding and brazing. Annotation c. Book News, Inc., Portland, OR (booknews.com)
Download or read book An Overview of Ultrasound written by Harold F. Stewart and published by . This book was released on 1982 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Challenges in Residual Stress Measurements and Evaluation written by Caterina Casavola and published by BoD – Books on Demand. This book was released on 2020-07-22 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residual stresses (RS) are stresses present inside materials even in the absence of any applied load. They are of capital importance because they can impact greatly on the mechanical strength of the material, on its dimensional correspondence to design specifications as well as on the fatigue life of the part. RS measurement and evaluation is currently an important research topic where a lot of challenges still need to be addressed. This book aims to provide the reader with an overview of the principal novelties in this field including current limitations and potential future developments. Both radically new experimental approaches as well as recent evolutions of consolidated ones will be presented, along with the latest novelties in the area of numerical residual stress evaluation.
Download or read book Resonant Ultrasound Spectroscopy written by Albert Migliori and published by Wiley-VCH. This book was released on 1997-08-14 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first procedural guide to RUS, Resonant Ultrasound Spectroscopy offers a clear step-by-step tutorial, from developing a preliminary set of resonances to final determination of moduli. The book also contains intermediate computer outputs showing where mistakes are made, how to spot them, and how to remeasure to correct problems. Also a complete reference to the language of RUS, this book is full of clear explanations of every variable, concept, and hard-to-find term currently in use.
Download or read book Ultrasonic Stress Measurements written by Albert C. Holt and published by . This book was released on 1986 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Evaluation of the Effect of Microstructure on the SNR of Ultrasonic Images and on the Velocity of Lcr Waves written by P. Pereira and published by . This book was released on 2016 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stress measurement using ultrasound employs the acoustoelastic theory that relates the variation of the velocity of elastic waves to the variation of stress in the material. However, not only stress has influence on wave velocity, but also the microstructure of the specimen being evaluated. The aim of this work is to verify the feasibility of using ultrasonic images to evaluate microstructural variations that affect the velocity of longitudinal critically refracted (Lcr) waves used in stress measurements. The images were generated applying the total focusing method (TFM) in signals obtained with an ultrasonic array. The signals recorded contain grain noise related to the material's microstructure. In this work, the time-of-flight (TOF) of Lcr waves and the signal-to-noise ratio (SNR) of ultrasonic images are obtained for samples of ASTM A36 steel with different grain sizes and shapes. The TOF is related to the wave velocity and the SNR to the grain noise intensity. The influence of stresses on the TOF and SNR was also verified. A linear relation between TOF and SNR was established with a variation rate of -76 ns/dB. No significant variations were observed in the SNR caused by the applied stress. Because the noise intensity of the images are sensitive only to microstructural variations, the technique presented has potential to be used to correct values of ultrasonic wave velocity in stress measurements.
Download or read book Fetal Heart Rate Monitoring written by Roger K. Freeman and published by Lippincott Williams & Wilkins. This book was released on 2012-09-26 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fetal heart rate monitoring affects the lives of millions of women and infants every year in the United States alone. Used by all members of the obstetric team - nurses, students, midwives, and physicians – it is the primary method to assess fetal oxygenation in both the antepartum and intrapartum setting. Improving outcomes and promoting patient safety depends upon correct use and interpretation of fetal heart rate monitoring, and is crucial to daily obstetric practice. This fourth edition provides the obstetrical team a framework within which to interpret and understand fetal heart rate tracings and their implications. The text covers key issues as the physiological basis for monitoring, a discussion of fetal hypoxemia and neonatal encephalopathy, instrumentation and pattern recognition. In addition to an in-depth review of the standardized NICHD nomenclature and three-tiered FHR Category approach, there are chapters on intrapartum and antepartum management as well as fetal central nervous system effects on monitor patterns. Since fetal monitoring is primarily a screening tool there are also discussions on the use of backup methods for evaluation of abnormal patterns. This 4th edition also brings the addition of Lisa A. Miller CNM, JD, who provides a nursing and midwifery perspective as well an enhanced legal and risk management review. This new fourth edition includes: Review of neonatal encephalopathy and recent studies on CP Currentinformation and discussion of most recent NICHD panel recommendations, both antepartum and intrapartum New chapter on Pitfalls in EFM Detailed chapter on risk management, liability & documentation New section on fetal maternal hemorrhage Update on new instrumentation Crucial information on maternal/fetal coincidence and FDA warnings All chapters include updated practice tips and clinical implications for the entire obstetric team Plus, with this edition clinicians have access to a companion website with full text and an image bank for fast & simplified clinical review.
Download or read book Concrete Stress Measurement Using Acoustic Wave Methods written by Ke Peng and published by . This book was released on 2016 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stress measurement in concrete structures is challenging due to the heterogeneous characteristics of concrete components. As a result, methods based on stress-relieving, including core drilling or slot cutting, are the only ones that able to measure in-situ stresses in concrete members. Other methods such as strain gauges, can only measure the change of stresses. The stress-relieving methods are based on the assumption that the concrete is linearly elastic and the stress distribution along the depth is uniform, and the modulus of elasticity of concrete can be accurately measured. In addition, the stress-relieving methods cause damage to concrete. This research explores the potential of linear and non-linear ultrasonic methods for measuring stresses in concrete structures to seek a nondestructive testing approach. Concrete specimens with 0.35, 0.5 and 0.65 water-to-cement (W/C) ratios were prepared and tested under various loading levels. The sensitivity of acoustic wave velocity, amplitude, first wave area, and the second and third harmonics to stress changes were evaluated. The loading was increased at an increment of approximately 2% of the ultimate compressive strength. In general, there is an obvious change at 40% of the ultimate compressive stress, and a sign of large damage at 60%. In the non-linear ultrasound test, the amplitudes of the fundamental, the second, and third harmonic waves all decrease with the increase of stress, and the third harmonic signal is the most sensitive to the change of stress; as for the linear ultrasound test, the first wave area and maximum amplitude of the S-wave are the most sensitive to stress, and the S-wave is generally more sensitive than the P-wave. Among the three W/C ratios (0.35, 0.5, and 0.65), the sensitivity of the amplitude decreases with the increase of W/C ratio, while the sensitivity of the harmonic amplitude ratios increases. The research demonstrated that notable correlations exist between acoustic parameters and stresses. To improve the accuracy and efficiency of the acoustic wave testing, six different materials were evaluated as couplants according to their efficiency of transmission and convenience of use. Among the six materials, water was found the most efficient, but cannot use in long-term testing; the efficiency drops in the order of CIP lube, lube, honey, candle wax, Duco glue and Crazy Aaron's liquid glass putty. Although the liquid glass putty is the most convenient to use, candle wax is considered the best choice as a couplant.
Download or read book Relating Muscle Stress and Stiffness Using Ultrasound Shear Wave Elastography written by Olivia Brencovich and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of an accurate and direct calculation of individual muscle force could improve modeling of human movement patterns and the management and diagnosis of musculoskeletal disorders. Current methods for measuring individual muscle force are either invasive or require extensive assumptions and indirect calculations. Due to its non-invasive procedures, high levels of accuracy and reliability, and short data acquisition times, ultrasound shear wave elastography is emerging as a promising technique for direct calculation of individual muscle force. Using shear wave elastography, the propagation speed of an applied shear wave is measured, which can be used to calculate shear modulus--a value representative of muscle stiffness. Several studies have found a linear relationship between muscle stiffness and applied force, but the constant of proportionality varies significantly for different muscle samples. The goal of this work is to relate muscle stiffness to tensile stress to decrease variation in the constant of proportionality. In this study, the stiffness of eight tibialis cranialis muscles of eight ex vivo porcine hindlimbs when subjected to passive loading was investigated. These stiffness values were related to applied passive force and tensile stress, indicating a strong linear relationship between muscle stiffness and both force and stress. It was found that variation in the constant of proportionality is lower for stiffness-stress comparisons than for stiffness-force comparisons. Nevertheless, variation remains and suggests that a predictive model developed from these results would not accurately represent the behavior of all muscle samples. Comparison of muscle stiffness and tensile stress decreases the effect of intrinsic mechanical properties on muscle stiffness, but further testing should be completed to determine an accurate predictive model.
Download or read book Ultrasound Elastography for Biomedical Applications and Medicine written by Ivan Z. Nenadic and published by John Wiley & Sons. This book was released on 2018-10-25 with total page 919 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasound Elastography for Biomedical Applications and Medicine Ivan Z. Nenadic, Matthew W. Urban, James F. Greenleaf, Mayo Clinic Ultrasound Research Laboratory, Mayo Clinic College of Medicine, USA Jean-Luc Gennisson, Miguel Bernal, Mickael Tanter, Institut Langevin – Ondes et Images, ESPCI ParisTech CNRS, France Covers all major developments and techniques of Ultrasound Elastography and biomedical applications The field of ultrasound elastography has developed various techniques with the potential to diagnose and track the progression of diseases such as breast and thyroid cancer, liver and kidney fibrosis, congestive heart failure, and atherosclerosis. Having emerged in the last decade, ultrasound elastography is a medical imaging modality that can noninvasively measure and map the elastic and viscous properties of soft tissues. Ultrasound Elastography for Biomedical Applications and Medicine covers the basic physics of ultrasound wave propagation and the interaction of ultrasound with various media. The book introduces tissue elastography, covers the history of the field, details the various methods that have been developed by research groups across the world, and describes its novel applications, particularly in shear wave elastography. Key features: Covers all major developments and techniques of ultrasound elastography and biomedical applications. Contributions from the pioneers of the field secure the most complete coverage of ultrasound elastography available. The book is essential reading for researchers and engineers working in ultrasound and elastography, as well as biomedical engineering students and those working in the field of biomechanics.
