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Techniques For Multiaxial Creep Testing

Author : D. J. Gooch
ISBN : 9789400934153
Genre : Science
File Size : 51.1 MB
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The design and assessment of modern high temperature plant demands an understanding of the creep and rupture behaviour of materials under multi axial stress states. Examples include thread roots in steam turbine casing bolts, branch connections in nuclear pressure vessels and blade root fixings in gas or steam turbine rotors. At one extreme the simple notch weakening/notch strengthening characterization of the material by circumferentially vee-notched uniaxial rupture tests, as specified in many national standards, may be sufficient. These were originally intended to model thread roots and their conservatism is such that they frequently are considered adequate for design purposes. At the other extreme full size or model component tests may be employed to determine the safety margins built into design codes. This latter approach is most commonly used for internally pressurized components, particularly where welds are involved. However, such tests are extremely expensive and the use of modern stress analysis techniques combined with a detailed knowledge of multiaxial properties offers a more economic alternative. Design codes, by their nature, must ensure conservatism and are based on a material's minimum specified properties. In the case of high temperature components the extension of life beyond the nominal design figure, say from 100000 to 200000 h, offers very significant economic benefits. However, this may require a more detailed understanding of the multiaxial behaviour of a specific material than was available at the design stage.
Category: Science

From Creep Damage Mechanics To Homogenization Methods

Author : Holm Altenbach
ISBN : 9783319194400
Genre : Technology & Engineering
File Size : 44.44 MB
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This volume presents a collection of contributions on materials modeling, which were written to celebrate the 65th birthday of Prof. Nobutada Ohno. The book follows Prof. Ohno’s scientific topics, starting with creep damage problems and ending with homogenization methods.
Category: Technology & Engineering

Unified Constitutive Laws Of Plastic Deformation

Author : A. S. Krausz
ISBN : 008054343X
Genre : Technology & Engineering
File Size : 65.99 MB
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High-technology industries using plastic deformation demand soundly-based economical decisions in manufacturing design and product testing, and the unified constitutive laws of plastic deformation give researchers aguideline to use in making these decisions. This book provides extensive guidance in low cost manufacturing without the loss of product quality. Each highly detailed chapter of Unified Constitutive Laws of Plastic Deformation focuses on a distinct set of defining equations. Topics covered include anisotropic and viscoplastic flow, and the overall kinetics and thermodynamics of deformation. This important book deals with a prime topic in materials science and engineering, and will be of great use toboth researchers and graduate students. Describes the theory and applications of the constitutive law of plastic deformation for materials testing Examines the constitutive law of plastic deformation as it applies to process and product design Includes a program on disk for the determination and development of the constitutive law of plastic deformation Considers economical design and testing methods
Category: Technology & Engineering

Multiaxial Fatigue And Deformation Testing Techniques

Author : Sreeramesh Kalluri
ISBN : 0803120451
Genre : Technology & Engineering
File Size : 65.65 MB
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Fourteen papers from the May 1995 symposium focus on the advances that new materials testing equipment and digital computers have made possible. Representative topics: testing facilities for multiaxial loading of tubular specimens, biaxial deformation experiments over multiple string regimes, charac
Category: Technology & Engineering

Materials For Advanced Power Engineering 1994

Author : D. Coutsouradis
ISBN : 0792330749
Genre : Power-plants
File Size : 56.95 MB
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The role of energy in the modern world goes beyond mere technology and economics to influence welfare, the environment, the quality of life and, in broad terms, civilization itself. Since the Industrial Revolution, energy conservation technology has been at the forefront of the innovation required to satisfy the needs of mankind and, more than any other, this technology has always depended on the performance of the materials used.
Category: Power-plants

Advances In Fatigue Lifetime Predictive Techniques

Author : Michael R. Mitchell
ISBN : 0803114230
Genre : Durée de vie (Ingénierie) - Congrès
File Size : 41.40 MB
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Twenty-seven papers from fatigue researchers and practitioners review in detail recent progress in the development of methods to predict fatigue performance of materials and structures and to assess the extent to which these new methods are finding their way into practice. The papers, from the ASTM
Category: Durée de vie (Ingénierie) - Congrès

Modeling Of Creep For Structural Analysis

Author : Konstantin Naumenko
ISBN : 9783540708391
Genre : Technology & Engineering
File Size : 75.87 MB
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This book develops methods to simulate and analyze the time-dependent changes of stress and strain states in engineering structures up to the critical stage of creep rupture. The objective of this book is to review some of the classical and recently proposed approaches to the modeling of creep for structural analysis applications. It also aims to extend the collection of available solutions of creep problems by new, more sophisticated examples.
Category: Technology & Engineering

Design For Creep

Author : Royston Kenneth Penny
ISBN : 0412590409
Genre : Technology & Engineering
File Size : 79.73 MB
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Our rationale for the second edition remains the same as for the first edition, which appeared over twenty years ago. This is to offer simplified, useful and easily understood methods for dealing with the creep of components operating under conditions met in practice. When the first edition was written, we could not claim that the methods which were introduced were well-tried. They were somewhat conjectural, although firmly based, but not sufficiently well devel oped. Since that time, the Reference Stress Methods (RSM) introduced in the book have received much scrutiny and development. The best recognition we could have of the original methods is the fact that they are now firmly embedded in codes of practice. Hopefully, we have now gone a long way towards achieving our original objectives. There are major additions to this second edition which should help to justify our claims. These include further clarification regarding Reference Stress Methods in Chapter 4. There are also new topics which depend on RSM in varying degrees: • Creep fracture is covered in Chapter 7, where methods for assessing creep crack initiation and crack growth are fully described. This chapter starts with a review of the basic concepts of fracture mechanics and follows with useful, approximate methods, compatible with the needs of design for creep and the availability of standard data. • Creep/fatigue interactions and environmental effects appear in Chapter 8.
Category: Technology & Engineering

Novel Angiogenic Mechanisms

Author : Nicanor I. Moldovan
ISBN : 0306476975
Genre : Medical
File Size : 51.13 MB
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New experimental observations often require fresh concepts for their interpretation, and at times even changes of paradigms. This is the situation with the recent realization that circulating endothelial progenitor cells may have an important contribution to the maintenance and formation of new endothelium in adult organisms, in a surprisingly wide variety of situations. The classical paradigm of angiogenesis, centered on the notion of "sprouting" can hardly accommodate them. It was previously realized that it needs to be "stretched out" to include alternative mechanisms of microvascular development, such as intussusception and capillary fusion. However, a major debate where to reconsider the sprouting mechanism, and to promote alternative views, did not take place yet. The number of publications in this field increased exponentially in the last years. Nevertheless, the concepts and notions so much needed to describe and to explain the new observations are still scarce, and heterogeneous. Within the larger community dedicated to the study of angiogenesis, the researchers involved in investigation of circulating precursor endothelial cells biology represent a subgroup with specific preoccupations and opinions. Many of them did not meet each other so far, and no major scientific events have been dedicated before exclusively to their interests. For the above reasons, the idea to organize a symposium addressing the new developments in angiogenesis research was received with enthusiasm by all those involved in its preparation.
Category: Medical

Ultra High Temperature Mechanical Testing

Author : R. D. Lohr
ISBN : STANFORD:36105018252408
Genre : Technology & Engineering
File Size : 42.10 MB
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The research and development of advanced materials for high-temperature applications requires special test methods, procedures and equipment. This recent book presents in-depth information on the subject prepared by leading high-temperature materials testing specialists from Europe, Japan and the U.S. The 18 illustrated reports cover key topics in the areas of equipment, theory, test design, test specimens, procedures, applications and test results interpretation and utility. A wealth of test data is included for various materials. The primary focus is on ceramic matrix composite materials. Other materials applications include intermetallics, refractories, and monolithic materials. The text includes numerous diagrams, flow charts and photographs which illustrate equipment, procedures and test specimens. The many tables and graphs provide test results and properties data for a variety of high temperature materials.
Category: Technology & Engineering