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Author: R. Procházka Publisher: ISBN: Category : Dynamic testing Languages : en Pages : 19
Book Description
The evaluation of the actual mechanical properties of in-service structures after a period of operation or the determination of local properties for detailed finite element method (FEM) simulation requires relevant material data obtained with high accuracy from a small volume of the experimental material. Therefore, non-destructive or semi-destructive techniques using small samples are being developed. The use of small-scale samples also enables the evaluation of material properties in various locations of tested components--for example, the mechanical properties of isolated regions of welds. One of the widely used methods in miniature specimen testing is the small punch test (SPT). The SPT is usually based on conversion of the obtained results into conventional parameters such as tensile properties, creep, fatigue, notch toughness, transition temperature, or fracture toughness parameters, but it requires known correlation parameters determined for the specific material. It was considered whether there is really a need to convert values from an SPT if there is not a chance to perform, for example, tensile tests directly on the same volume of experimental material as used in the SPT. Preliminary FEM analysis was performed with subsequent experimental verification of the possibility of testing small tensile samples with the following dimensions: active part length, 3 mm; width, 1.5 mm; and thickness, 0.5 mm. On the basis of promising preliminary results, testing fixtures for micro-tensile samples were developed together with a testing procedure. The performance of the micro-tensile test method relative to standard tensile tests is shown here together with its application to weld characterization.
Author: R. Procházka Publisher: ISBN: Category : Dynamic testing Languages : en Pages : 19
Book Description
The evaluation of the actual mechanical properties of in-service structures after a period of operation or the determination of local properties for detailed finite element method (FEM) simulation requires relevant material data obtained with high accuracy from a small volume of the experimental material. Therefore, non-destructive or semi-destructive techniques using small samples are being developed. The use of small-scale samples also enables the evaluation of material properties in various locations of tested components--for example, the mechanical properties of isolated regions of welds. One of the widely used methods in miniature specimen testing is the small punch test (SPT). The SPT is usually based on conversion of the obtained results into conventional parameters such as tensile properties, creep, fatigue, notch toughness, transition temperature, or fracture toughness parameters, but it requires known correlation parameters determined for the specific material. It was considered whether there is really a need to convert values from an SPT if there is not a chance to perform, for example, tensile tests directly on the same volume of experimental material as used in the SPT. Preliminary FEM analysis was performed with subsequent experimental verification of the possibility of testing small tensile samples with the following dimensions: active part length, 3 mm; width, 1.5 mm; and thickness, 0.5 mm. On the basis of promising preliminary results, testing fixtures for micro-tensile samples were developed together with a testing procedure. The performance of the micro-tensile test method relative to standard tensile tests is shown here together with its application to weld characterization.
Author: Ashish Kolhatkar Publisher: ISBN: Category : Tensile architecture Languages : en Pages : 15
Book Description
In this work, a miniature tensile specimen with nominal dimensions of 3.0-mm gage length (GL), 1.5-mm gage width, and 0.5-mm thickness that was carved out of a 10.0-mm-diameter disk has been developed and standardized using analytical and experimental methods. The geometry of the miniature specimen, called ultra sub-size (USS), was optimized using finite element analysis to determine the fillet radius and appropriate geometrical tolerances for specimen dimensions like gage width and thickness. The methods of specimen preparation, gripping, and tensile testing with the use of digital image correlation for strain measurement were standardized. The 0.2 % offset yield strength, ultimate tensile strength, and uniform strain of different materials obtained using this specimen geometry were analyzed and compared with the results of ASTM sub-size (GL: 25mm) and further sub-size geometry (GL: 12.5mm) The results of this study show that USS tensile specimen geometry developed in this work can be reliably employed for mechanical property evaluation in situations where tensile testing using standard-size specimens is practically not possible.
Author: Sujitkumar Dongare Publisher: ISBN: Category : Manufacturing processes Languages : en Pages : 86
Book Description
"The study of mechanical properties of metals provides a basis to decide on the capability of a particular metal for a task and also to make predictions about its life. The concepts of stress, strain and strength of materials are employed in practically every engineering discipline. Mechanical properties such as stiffness, yield strength, tensile strength, ductility, toughness, impact resistance, creep resistance, fatigue resistance and others, influence the design, fabrication and service life of equipment. Therefore, more than one property is considered for the material selection process for an application. For complete understanding of any material and its feasibility for a particular application, inter-related mechanical properties have to be measured. Unfortunately, these properties cannot be measured in any single test. However, the tensile test can be used to measure a number of the most commonly used mechanical properties. Extensive research has already been performed in this area. Standards have been developed and established regarding the size of test specimens, testing procedures and process parameters. This thesis discusses the development of a testing procedure for non-standard tensile tests for evaluation of material properties. Miniature test specimens similar to the standard ASTM E8 were designed and used for testing. The tests were mainly conducted on the baseline material for aerospace industry i.e. Ti-6Al-4V"--Abstract, leaf iv.
Author: William N. Sharpe, Jr. Publisher: Springer Science & Business Media ISBN: 0387268839 Category : Mathematics Languages : en Pages : 1100
Book Description
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.
Author: J. Siegl Publisher: ISBN: Category : Component integrity Languages : en Pages : 8
Book Description
Nuclear reactors and related components must comply with high standards of reliability and safety in order to operate. The contemporary practice of operating life extensions and reactor power upgrades constitutes new challenges in the process of ensuring safe long-term operation. The primary input data for safety analysis were obtained by means of in-service inspections and surveillance programs. The limitations of surveillance programs, necessitate the need to develop more progressive mechanical testing methods. This work focused on the use of small punch tests for the determination of tensile properties of VVER reactor type materials.
Author: C. H. Hastings Publisher: ISBN: Category : Boron compounds Languages : en Pages : 108
Book Description
This report concerns itself with a detailed evaluation and development of ultrasonic interval velocity measurement technique. Results indicate that it is a practical and powerful tool applicable to the evaluation of boron/epoxy laminates for structural hardware components. Best results are achieved in the 0 and 90 degree directions of the laminates studied. Unbalanced laminates lead to greater errors in the 45 degree direction. Measurements off-angle with respect to reinforcing filaments do not now seem to be reliable. Based on interval velocity measurements, correlations have been developed for modulus calculation and tensile strength prediction. Accuracies appear to be better than tensile tests for modulus (less scatter) and as good as tensile tests for strength determination. Yield strengths did not appear to be predictable because of excessive scatter in the densile data. Degradation of boron/epoxy laminates studied, because of prior tensile loading did not exist. (Author-PL).
Author: T. W. Clyne Publisher: Cambridge University Press ISBN: 1108837891 Category : Science Languages : en Pages : 297
Book Description
Discover a novel approach to the subject, providing detailed information about established and innovative mechanical testing procedures.
Author: W. R. Corwin Publisher: ASTM International ISBN: 0803124767 Category : Light water reactors Languages : en Pages : 630
Book Description
As part of an increasing interest in radiation embrittlement for aging nuclear reactors, scientists gathered in New Orleans in January 1997 to consider the interests and capabilities of the scientific-testing community and of the commercial light-water-cooled power-reactor industry in terms of improving methods to characterize component integrity. The resulting 37 papers concentrate on the use of unique small and miniature specimens; nondestructive, nonintrusive, and in- situ test techniques for measuring mechanical and fracture properties; the application of tests to irradiation-induced embrittlement; and actual examples of tests to determine material integrity and to evaluate potential component life extension. They consider experimental, analytical, and computational aspects. Annotation copyrighted by Book News, Inc., Portland, OR
Author: Pranav H. Darji Publisher: BoD – Books on Demand ISBN: 1789231582 Category : Science Languages : en Pages : 288
Book Description
This book contains two sections: Chapters 1-7 deal with contact mechanics, and Chapters 8-13 deal with fracture mechanics. The different contributions of this book will cover the various advanced topics of research. It provides some needed background with respect to contact mechanics, fracture mechanics and the use of finite element methods in both. All the covered chapters of this book are of a theoretical and applied nature, suitable for the researchers of engineering, physics, applied mathematics and mechanics with an interest in computer simulation of contact and fracture problems.
Author: R. Procházka
Author: R. Procházka
Author: Joseph R. Davis
Author: Ashish Kolhatkar
Author: Sujitkumar Dongare
Author: William N. Sharpe, Jr.
Author: J. Siegl
Author: C. H. Hastings
Author: T. W. Clyne
Author: W. R. Corwin
Author: Pranav H. Darji