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Use Of Miniaturized Compact Tension Specimens For Fracture Toughness Measurements In The Upper Shelf Regime
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Book Synopsis Use of Miniaturized Compact Tension Specimens for Fracture Toughness Measurements in the Upper Shelf Regime by : Enrico Lucon
Download or read book Use of Miniaturized Compact Tension Specimens for Fracture Toughness Measurements in the Upper Shelf Regime written by Enrico Lucon and published by . This book was released on 2006 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the nuclear field, the importance of direct fracture toughness measurements on reactor pressure vessel (RPV) materials has been nowadays widely recognized, as opposed to Charpy-based estimations. However, sample dimensions have to be kept small in order to optimize the use of available material (often in the form of previously broken Charpy specimens) or, in the case of new irradiations, make effective use of the limited space available inside irradiation facilities. One of the most appealing geometries for fracture toughness measurements is the miniature Compact Tension specimen, MC(T), which has the following dimensions: B = 4.15 mm, W = 8.3 mm, cross section 10 × 10 mm2. Four MC(T) specimens can be machined out of a broken half Charpy, and in the case of irradiation ten MC(T) samples occupy approximately the same volume as a full-size Charpy specimen. A comprehensive investigation is presented in this paper, aimed at assessing the applicability of MC(T) specimens to measure fracture toughness in fully ductile (upper shelf) conditions. In this study, 18 1TC(T) and 20 MC(T) specimens have been tested at different temperatures from three RPV steels and one low-alloy C-Mn steel. The results obtained clearly show that MC(T) samples exhibit lower fracture toughness properties, both in terms of initiation of ductile tearing (according to various test standards) and resistance to ductile crack propagation (J-R curve). The reduction of tearing resistance might be attributed to work hardening prevailing over loss of constraint in the uncracked ligament for a side-grooved specimen, or to the inadequacy of J-integral to represent ductile crack extension in very small specimens. Both arguments need to be verified with further investigations.
Book Synopsis Miniature Compact Tension Specimens for Upper Shelf Fracture Toughness Measurements on RPV Steels by : Enrico Lucon
Download or read book Miniature Compact Tension Specimens for Upper Shelf Fracture Toughness Measurements on RPV Steels written by Enrico Lucon and published by . This book was released on 2008 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Miniature compact tension, MC(T), specimens (thickness B = 4.15 mm) have been recently investigated at SCK•CEN for measuring the fracture toughness of steels under fully ductile conditions (upper shelf regime). The first results of this assessment, made by comparison with results obtained from 1TC(T) samples of various RPV steels with quite different toughness properties, have been described in a previous paper by the same authors. It was observed that, although a systematic and significant underestimation of both critical toughness values and crack propagation resistance was observed for the MC(T) samples with respect to the bigger specimens, it is possible to establish an empirical correlation between the two geometries which allows deriving acceptable estimates of the material's critical toughness. In this work, further investigations are presented, related to: (1) the behavior of MC(T) and 1TC(T) specimens in the crack tip blunting phase; (2) the role of work hardening in decreasing the tearing resistance of MC(T) specimens; and (3) the use of alternative parameters (crack-tip opening displacement, crack-tip opening angle, Ernst's modified J-integral JM). Evidence is also presented which could justify a revision of the specimen measuring capacity (Jmax) in the current ASTM Standard E1820-05, which appears too severe and could be relaxed. Further work will include validating on irradiated materials the empirical correlations established between 1TC(T) and MC(T) test results.
Book Synopsis Contact and Fracture Mechanics by : Pranav H. Darji
Download or read book Contact and Fracture Mechanics written by Pranav H. Darji and published by BoD – Books on Demand. This book was released on 2018-05-30 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Comprehensive Materials Processing by :
Download or read book Comprehensive Materials Processing written by and published by Newnes. This book was released on 2014-04-07 with total page 5485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Materials Processing, Thirteen Volume Set provides students and professionals with a one-stop resource consolidating and enhancing the literature of the materials processing and manufacturing universe. It provides authoritative analysis of all processes, technologies, and techniques for converting industrial materials from a raw state into finished parts or products. Assisting scientists and engineers in the selection, design, and use of materials, whether in the lab or in industry, it matches the adaptive complexity of emergent materials and processing technologies. Extensive traditional article-level academic discussion of core theories and applications is supplemented by applied case studies and advanced multimedia features. Coverage encompasses the general categories of solidification, powder, deposition, and deformation processing, and includes discussion on plant and tool design, analysis and characterization of processing techniques, high-temperatures studies, and the influence of process scale on component characteristics and behavior. Authored and reviewed by world-class academic and industrial specialists in each subject field Practical tools such as integrated case studies, user-defined process schemata, and multimedia modeling and functionality Maximizes research efficiency by collating the most important and established information in one place with integrated applets linking to relevant outside sources
Book Synopsis Use of KLST-Type Miniature Charpy Specimens for Measuring Dynamic Fracture Toughness Under Impact Loading Rates by : Marc Scibetta
Download or read book Use of KLST-Type Miniature Charpy Specimens for Measuring Dynamic Fracture Toughness Under Impact Loading Rates written by Marc Scibetta and published by . This book was released on 2009 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The knowledge of dynamic mechanical properties is useful in all cases where the strain rate sensitivity of metallic materials is an issue, and whenever the actual loading conditions for a structure (either in normal operation or under accidental circumstances) are different from static. Furthermore, in some investigations, increasing the loading rate in a mechanical test is used to simulate other embrittling mechanisms such as thermal aging or neutron exposure. Precracked Charpy-type (PCVN) specimens, tested under impact loading rates using an instrumented pendulum, have been used for more than 30 years to measure dynamic fracture toughness; the experimental procedure and the analysis methodology are fairly well established, despite the lack of an ASTM or ISO official test standard. This paper addresses the applicability of fatigue precracked miniature Charpy specimens of KLST type (PKLST-B = 3 mm, W = 4 mm and L = 27 mm) for impact toughness measurements in the ductile-to-brittle transition regime and in fully ductile (upper shelf) conditions. In the transition region, tests have been analyzed using the Master Curve approach; the multiple-specimen (low-blow) method has been applied in the upper shelf regime. A well-known and fully characterized reactor pressure vessel steel of the A533B Cl.1 type (JRQ) has been used; the results obtained have been compared with data previously obtained from standard-size precracked Charpy specimens. It has been found that under impact loading conditions PKLST specimens suffer significant loss of constraint when compared to conventional precracked Charpy V-notch samples, in both transition and upper shelf conditions.
Book Synopsis Handbook of Research on Green Engineering Techniques for Modern Manufacturing by : Uthayakumar, M.
Download or read book Handbook of Research on Green Engineering Techniques for Modern Manufacturing written by Uthayakumar, M. and published by IGI Global. This book was released on 2018-11-16 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: Green manufacturing has developed into an essential aspect of contemporary manufacturing practices, calling for environmentally friendly and sustainable techniques. Implementing successful green manufacturing processes not only improves business efficiency and competitiveness but also reduces harmful production in the environment. The Handbook of Research on Green Engineering Techniques for Modern Manufacturing provides emerging perspectives on the theoretical and practical aspects of green industrial concepts, such as green supply chain management and reverse logistics, for the sustainable utilization of resources and applications within manufacturing and engineering. Featuring coverage on a broad range of topics such as additive manufacturing, integrated manufacturing systems, and machine materials, this publication is ideally designed for engineers, environmental professionals, researchers, academicians, managers, policymakers, and graduate-level students seeking current research on recent and sustainable practices in manufacturing processes.
Book Synopsis Miniaturized Testing of Engineering Materials by : V. Karthik
Download or read book Miniaturized Testing of Engineering Materials written by V. Karthik and published by CRC Press. This book was released on 2016-09-15 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive overview of methods of characterizing the mechanical properties of engineering materials using specimen sizes in the micro-scale regime (0.3-5.0 mm). A range of issues associated with miniature specimen testing like correlation methodologies for data transferability between different specimen sizes, use of numerical simulation/analysis for data inversion, application to actual structures using scooped out samples or by in-situ testing, and more importantly developing a common code of practice are discussed and presented in a concise manner.
Book Synopsis Fatigue and Fracture Mechanics by : Richard Edward Link
Download or read book Fatigue and Fracture Mechanics written by Richard Edward Link and published by . This book was released on 2007 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture Toughness; Proceedings by :
Download or read book Fracture Toughness; Proceedings written by and published by . This book was released on 1972 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Miniaturized Fracture Toughness Testing During the Plant Life Extension Period by : MP. Manahan
Download or read book Miniaturized Fracture Toughness Testing During the Plant Life Extension Period written by MP. Manahan and published by . This book was released on 1993 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is desirable to obtain plane strain fracture toughness data in support of plant refurbishment and plant life extension (PLEX) efforts. These data may be needed for pressurized thermal shock (PTS) analyses, low upper shelf energy analyses, and to verify shifts in the KIR curve. A major impediment to the development of plant-specific fracture toughness data is the specimen size requirement and the fact that many surveillance capsule programs do not include fracture toughness specimens.
Book Synopsis Development of a Miniaturized Specimen Technique for Fracture Toughness JIc Measurement by : XY. Mao
Download or read book Development of a Miniaturized Specimen Technique for Fracture Toughness JIc Measurement written by XY. Mao and published by . This book was released on 1988 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of specimen thickness on fracture toughness JIc has been investigated with compact tension specimens using the multispecimen R-curve method. HT-9 and A533B-1 steel specimens with thicknesses of 25(1TCT), 10(0.4TCT), 3, and 0.5(0.2TCT) mm were tested. Some of them did not satisfy the ASTM E 813 size requirement for valid JIc. The through-thickness distribution of the plastic energy dissipation or work done within the intense strain region at the crack tip was measured by using a recrystallization-etch technique. Fractographic examinations of the variation of stretch zone width and fracture modes along the specimen thickness were performed by scanning electron microscopy (SEM), where flat fracture and shear fracture regions have been distinguished. A new JIc evaluation procedure for invalid specimen size is proposed using rigid plastic analysis and shear fracture measurements with recrystallization-etch or fractographic observations. Predicted JIc values are compared with the JIc values obtained from valid specimen size. This miniaturized specimen technique may be applicable to post-irradiation fracture toughness testing.
Book Synopsis Examination on Fracture Resistance of F82H Steel and Performance of Small Specimens in Transition and Ductile Regimes by : K. Wallin
Download or read book Examination on Fracture Resistance of F82H Steel and Performance of Small Specimens in Transition and Ductile Regimes written by K. Wallin and published by . This book was released on 2002 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture toughness determination standards and procedures give limits for the measuring capacity of different specimen sizes and types. Numerical methods and local approach are used as additional means to determine the validity of the toughness estimates and provide toughness scaling criteria for integrity assessment. The current study contributes to this domain and presents experimental and numerical results of fracture toughness and tearing resistance of F82H ferritic stainless steel. Three-point bend specimens of sizes 3 x 4 x 27 mm, 5 x 5 x 27 mm, 5 x 10 x 55 mm, 10 x 10 x 55 mm and 25 mm compact tension specimens are tested in the temperature range of-196°C to room temperature, in order to determine and characterize the fracture properties of F82H and specimen measuring capabilities from brittle lower shelf cleavage to upper shelf ductile R-curve. The experimental results are used to calibrate local approach models, which are then further applied to determine the attributes and usability of the different small specimens.
Book Synopsis Study of the Effects of Various Geometrical and Loading Parameters on the Fracture Resistance Behaviour of a Reactor-Grade Pressure Vessel Steel in the Upper Shelf as Well as DBTT Regime by : M. K. Samal
Download or read book Study of the Effects of Various Geometrical and Loading Parameters on the Fracture Resistance Behaviour of a Reactor-Grade Pressure Vessel Steel in the Upper Shelf as Well as DBTT Regime written by M. K. Samal and published by . This book was released on 2015 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike mechanical properties, the fracture resistance behaviour of ductile materials depends upon the state of stress existing ahead of the growing crack-tip. For ductile materials, the fracture resistance, expressed in terms of J-R curve, goes on changing with crack growth. The J-R curves are influenced by the specimen geometry, size, crack-depth, and loading and boundary conditions, etc. Another complicacy arises in the ductile-to-brittle transition temperature regime, where the fracture toughness exhibits considerable scatter and dependency upon temperature. For structural integrity analysis of safety-critical components, fracture resistance data are required in the upper-shelf as well as in the transition regime in order to account for the design-basis postulated accidental loading conditions. It may not always be possible to carry out fracture tests on real-life components due to several limitations, including those of irradiation environment apart from the prohibitive cost and time required for the tests. Finite element (FE) analysis of the components with postulated cracks and loading conditions offer an impressive alternative to safety-analysts. In this work, experiments were conducted on two different types of fracture mechanics specimens not only in the upper-shelf but also in the transition regime. The effect of crack-depth on the fracture behaviour was studied using shallow-cracked and deep-cracked specimens. The size effect was studied using specimens with different thickness values. The effect of specimen geometry and loading condition was studied using a compact-tension and a single-edged-notched-bend specimen. For the FE analysis, nonlocal Rousselier's damage model was used. We extensively studied the effects of several variables on the fracture toughness of a ferritic pressure vessel steel, which have not received much attention in the literature. Extensive experiments were conducted to verify the numerical simulation results of nonlocal damage models.
Book Synopsis Fracture Toughness Measurements with Subsize Disk Compact Specimens by :
Download or read book Fracture Toughness Measurements with Subsize Disk Compact Specimens written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture Toughness Determination with the Use of Miniaturized Specimens by : Jan Dzugan
Download or read book Fracture Toughness Determination with the Use of Miniaturized Specimens written by Jan Dzugan and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture mechanics has been used for decades nowadays, and methods have been well established in the community especially for standard-sized specimens. As it was mainly developed for large structure assessment against the brittle failure, standardized specimens are of large size at present. However, in many cases, these standard specimens are not possible to apply due to size requirements of the available experimental material or the size of the component considered. These can be cases of residual service life assessment of in-service components, local properties determination (e.g., across weld), anisotropy determination and assessment of mechanical properties of newly developed materials under laboratory conditions (e.g., SPD processed materials, et cetera). Therefore, development of new methods using significantly smaller specimens has to be carried out, and procedures using smaller-sized specimens together with their validity limits and relation to standardly obtained results have to be provided in order to provide solution for wide applications.
Book Synopsis Fracture Toughness Measurements in the Transition Region Using Sub-Size Precracked Charpy and Cylindrical Bar Specimens by : E. van Walle
Download or read book Fracture Toughness Measurements in the Transition Region Using Sub-Size Precracked Charpy and Cylindrical Bar Specimens written by E. van Walle and published by . This book was released on 2002 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the study presented here is the validation of direct fracture toughness measurements using two small-size geometries, which can be obtained from machining broken Charpy-V specimens: • the miniaturized precracked Charpy-V specimen (MPCCv); • the miniaturized Cracked Round Bar (MCRB). Fracture toughness results have been obtained in the ductile-to-brittle transition regime for two well-characterized reactor pressure vessel steels, and compared using the Master Curve analysis to reference data measured using bigger samples of the more conventional C(T) geometry.
Book Synopsis Fracture Toughness Measurements in the Transition Regime Using Small Size Samples by : R. Chaouadi
Download or read book Fracture Toughness Measurements in the Transition Regime Using Small Size Samples written by R. Chaouadi and published by . This book was released on 1998 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present paper reports the treatment of fracture toughness data in the ductile-to-brittle transition regime by using Charpy size specimens. Size effect and statistical variation are taken into account according to a statistical model associated to the weakest link model. The methodology is first calibrated on a reference reactor pressure vessel material, for which fracture toughness data obtained on large samples are available. This methodology is successfully applied to a number of RPV steels to determine the fracture toughness behaviour in the transition regime. Monte Carlo simulations are performed to determine the confidence interval of the reference temperature as derived from a small number of tests.
