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Author : Nagaraja S. Iyyer
Publisher :
ISBN 13 :
Total Pages : 162 pages
Book Rating : 4.:/5 (317 download)
Download or read book Closure of Fatigue Cracks at High Strains written by Nagaraja S. Iyyer and published by . This book was released on 1985 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wolf Elber
Publisher : ASTM International
ISBN 13 : 0803109962
Total Pages : 671 pages
Book Rating : 4.8/5 (31 download)
Download or read book Mechanics of Fatigue Crack Closure written by Wolf Elber and published by ASTM International. This book was released on 1988 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : RC. McClung
Publisher :
ISBN 13 :
Total Pages : 21 pages
Book Rating : 4.:/5 (125 download)
Download or read book Closure Behavior of Small Cracks Under High Strain Fatigue Histories written by RC. McClung and published by . This book was released on 1988 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specimens of a Society of Automotive Engineers (SAE) 1026 steel are subjected to constant amplitude and block loading fatigue histories. Nominal strain amplitudes range from 0.001 to 0.007. The behavior of small cracks (0.1 to 1.5 mm) initiated at very small (50 ?m) electro-discharge machined edge notches is studied using a two-step replication technique that enables identification of the load level at which the crack tip first opens or closes. Replicas of the crack tip region are examined in the scanning electron microscope at magnifications up to x4500. The normalized crack opening level is observed to decrease with increasing strain amplitude for constant amplitude histories. Results compare favorably with the modified Dugdale analysis of Newman. Crack closing levels also decrease with strain amplitude, and closing levels are significantly lower than opening levels at high strains. Correlations of constant amplitude crack growth rates based on estimates of the change in the J integral (?J) or crack-tip opening displacement (?CTOD) are more successful when effective stress ranges are considered. Large strain excursions in simple block histories are observed to have a major impact on crack opening behavior during the smaller strain cycles. Typically the crack tip remains entirely open during subcycles immediately following a major cycle, causing significant crack growth acceleration. A simple model is used to correlate these variable amplitude crack growth rates.
Author : R. Craig McClung
Publisher : ASTM International
ISBN 13 : 0803126115
Total Pages : 487 pages
Book Rating : 4.8/5 (31 download)
Download or read book Advances in Fatigue Crack Closure Measurement and Analysis written by R. Craig McClung and published by ASTM International. This book was released on 1999 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. C. Newman
Publisher : ASTM International
ISBN 13 : 0803126247
Total Pages : 436 pages
Book Rating : 4.8/5 (31 download)
Download or read book Fatigue Crack Growth Thresholds, Endurance Limits, and Design written by J. C. Newman and published by ASTM International. This book was released on 2000 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Contains 24 papers from the November, 1998 symposium of the same name, sponsored by the ASTM Committee E8 on Fatigue and Fracture, and presented by Newman and Piascik (both of the NASA Langley Research Center). The papers focus on such areas as fatigue-crack growth threshold mechanisms, loading and specimen-type effects, analyses of fatigue-crack-growth-threshold behavior, and applications of threshold concepts and endurance limits to aerospace and structural materials. Annotation copyrighted by Book News, Inc., Portland, OR.
Author : Maria El Zeghayar
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (827 download)
Download or read book The Introduction of Crack Opening Stress Modeling Into Strain-life and Small Crack Growth Fatigue Analysis written by Maria El Zeghayar and published by . This book was released on 2010 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work in this thesis is concerned with the mechanics of the initiation and growth of small fatigue cracks from notches under service load histories. Fatigue life estimates for components subjected to variable amplitude service loading are usually based on the same constant amplitude strain-life data used for constant amplitude fatigue life predictions. The resulting fatigue life estimates although they are accurate for constant amplitude fatigue, are always non conservative for variable amplitude load histories. Similarly fatigue life predictions based on small crack growth calculations for cracks growing from flaws in notches are non conservative when constant amplitude crack growth data are used. These non conservative predictions have, in both cases, been shown to be due to severe reductions in fatigue crack closure arising from large (overload or underload) cycles in a typical service load history. Smaller load cycles following a large near yield stress overload or underload cycle experience a much lower crack opening stress than that experienced by the same cycles in the reference constant amplitude fatigue tests used to produce design data. This reduced crack opening stress results in the crack remaining open for a larger fraction of the stress-strain cycle and thus an increase in the effective portion of the stress-strain cycle. The effective strain range is increased and the fatigue damage for the small cycles is greater than that calculated resulting in a non conservative fatigue life prediction. Previous work at Waterloo introduced parameters based on effective strain-life fatigue data and effective stress intensity versus crack growth rate data. Fatigue life calculations using these parameters combined with experimentally derived crack opening stress estimates give accurate fatigue life predictions for notched components subjected to variable amplitude service load histories. Information concerning steady state crack closure stresses, effective strain-life data, and effective stress intensity versus small crack growth rate data, are all obtained from relatively simple and inexpensive fatigue tests of smooth specimens in which periodic underloads are inserted into an otherwise constant amplitude load history. The data required to calibrate a variable amplitude fatigue crack closure model however, come from time consuming measurements of the return of crack closure levels for small cracks to a steady state level following an underload (large cracks for which crack closure measurements are easier to make cannot be used because at the high stress levels in notches under service loads a test specimen used would fracture).
Author : DL. Davidson
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (125 download)
Download or read book Near-Tip and Remote Characterization of Plasticity-Induced Fatigue Crack Closure written by DL. Davidson and published by . This book was released on 1999 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: An elastic-plastic finite element model and high resolution experimental measurements of growing fatigue cracks are employed in partnership to investigate the relationship between crack closure, near-tip deformation behavior, and remote load-displacement measurements. The model focuses on plasticity-induced closure effects for fatigue cracks in the Paris regime, while the experiments study fatigue cracks in the Paris and near-threshold regimes in a variety of materials. The suitability of the ASTM compliance offset method and the recently-proposed adjusted compliance ratio (ACR) method to characterize near-tip closure effects is evaluated. The experiments and analyses both show that crack-tip strains below the crack-opening stress, Sop, are a relatively small fraction of the total crack-tip strain range for cracks in the Paris regime, and therefore may be insignificant for crack-tip deformation and damage and crack growth. The experiments further indicate that crack-tip strains below Sop are a relatively larger fraction of the total crack-tip strain at lower ?K values, nearer the threshold, where Sop values are higher. The current ASTM compliance offset procedure for determining the crack opening load is shown to provide accurate information about true crack-tip opening loads in theory. However, due to the limited sensitivity of the method in practice, and the corresponding need to employ a non-zero compliance offset, the method gives underestimates of opening and closing loads that may be considerably in error relative to the true crack-tip values. The current ACR technique does not appear to do a good job of characterizing the near-tip deformation response for cracks in the Paris regime, because remote displacement measurements do not appear to be adequately sensitive to near-tip strains.
Author : K.S. Ravichandran
Publisher : Elsevier
ISBN 13 : 0080569706
Total Pages : 511 pages
Book Rating : 4.0/5 (85 download)
Download or read book Small Fatigue Cracks written by K.S. Ravichandran and published by Elsevier. This book was released on 1999-09-30 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the fully peer-reviewed papers presented at the Third Engineering Foundation Conference on Small Fatigue Cracks, held under the chairmanship of K.S. Ravichandran and Y. Murakami during December 6-11, 1998, at the Turtle Bay Hilton, Oahu, Hawaii. This book presents a state-of-the-art description of the mechanics, mechanisms and applications of small fatigue cracks by most of the world's leading experts in this field. Topics ranging from the mechanisms of crack initiation, small crack behavior in metallic, intermetallic, ceramic and composite materials, experimental measurement, mechanistic and theoretical models, to the role of small cracks in fretting fatigue and the application of small crack results to the aging aircraft and high-cycle fatigue problems, are covered.
Author : A. J. McEvily
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (31 download)
Download or read book An Investigation of Nonpropagating Fatigue Cracks written by A. J. McEvily and published by . This book was released on 1959 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : PL. Lalor
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (125 download)
Download or read book Fatigue Crack Closure Outside a Small-Scale Yielding Regime written by PL. Lalor and published by . This book was released on 1988 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: An elasto-plastic finite-element model has been developed to simulate fatigue crack growth and to establish crack opening levels in a notched member. Intermediate and high stress levels where small-scale yielding conditions no longer prevail were considered. Variations in crack opening and closure levels with crack length, stress state, R ratio, stress level, and degree of strain hardening were examined. Cracks were allowed to generate their own plastic wake upon advance from the notch surface. Restricting the development of a full plastic wake resulted in lower asymptotic closure levels for certain cases. Complete (R = -1) and partial (R = 0) closure of crack surfaces and the ensuing residual stresses in the crack wake were determined and linked to the crack length effect on closure. Two states of stress (plane strain and plane stress) were considered. Differences in closure levels between the two stress states developed as the crack grew from the notch.
Author :
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.F/5 ( download)
Download or read book Engine Structures written by and published by . This book was released on 1988 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ulrich Krupp
Publisher : John Wiley & Sons
ISBN 13 : 3527315373
Total Pages : 312 pages
Book Rating : 4.5/5 (273 download)
Download or read book Fatigue Crack Propagation in Metals and Alloys written by Ulrich Krupp and published by John Wiley & Sons. This book was released on 2007-04-09 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and some of the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process with a focus on microstructurally short cracks and dynamic embrittlement. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.
Author :
Publisher :
ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.3/5 (243 download)
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E-H Wong
Publisher : Woodhead Publishing
ISBN 13 : 0857099116
Total Pages : 477 pages
Book Rating : 4.8/5 (57 download)
Download or read book Robust Design of Microelectronics Assemblies Against Mechanical Shock, Temperature and Moisture written by E-H Wong and published by Woodhead Publishing. This book was released on 2015-05-23 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: Robust Design of Microelectronics Assemblies Against Mechanical Shock, Temperature and Moisture discusses how the reliability of packaging components is a prime concern to electronics manufacturers. The text presents a thorough review of this important field of research, providing users with a practical guide that discusses theoretical aspects, experimental results, and modeling techniques. The authors use their extensive experience to produce detailed chapters covering temperature, moisture, and mechanical shock induced failure, adhesive interconnects, and viscoelasticity. Useful program files and macros are also included. Discusses how the reliability of packaging components is a prime concern to electronics manufacturers Presents a thorough review of this important field of research, providing users with a practical guide that discusses theoretical aspects, experimental results, and modeling techniques Includes program files and macros for additional study
Author : K.T. Rie
Publisher : Springer Science & Business Media
ISBN 13 : 9400934599
Total Pages : 781 pages
Book Rating : 4.4/5 (9 download)
Download or read book Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials written by K.T. Rie and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 781 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1979 the first InternationalSymposium on Low CycleFatigue and Elasto-Plastic Behaviour of Materials was held in Stuttgart, FRG. Since then research in low cycle fatigue has proceeded rapidly. The vital interest of engineers and researchers in communicating the rapid advances in the ongoing research in low cycle fatigue has encouraged me to initiate again the Second International Conference which was held in Munich, FRG, 7-11 September 1987. Failure in low cycle fatigue represents a serious problem in the design and opera tion of highly stressed structures. Under complex loading and environmental cir cumstances, especially for high temperature services, reliable life prediction can not be expected without detailed consideration of the failure mechanism and with out extensive use of mechanistic approaches. The purpose of this conference was to provide a forum to discuss the advances in recent research in the field of low cycle fatigue. The conference was intended to help to further bridge the gap between those who are involved in basic research, and the engineers who have to perform the design of highly stressed structural components.
Author :
Publisher :
ISBN 13 :
Total Pages : 880 pages
Book Rating : 4.3/5 (91 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : C. Moura Branco
Publisher : Springer Science & Business Media
ISBN 13 : 9400922779
Total Pages : 982 pages
Book Rating : 4.4/5 (9 download)
Download or read book Advances in Fatigue Science and Technology written by C. Moura Branco and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the edited version of lectures and selected research contributions presented at the NATO ADVANCED STUDY INSTITUTE on ADVANCES IN FATIGUE SCIENCE AND TECHNOLOGY. held in Alvor. Portugal, 4th to 15th of April 1988. and organized by CEMUL - Center of Mechanics and Materials of The Technical University of Lisbon. The Institute was attended by 101 participants, including 15 lecturers. from 14 countries. The participants were leading scientists and engineers from universities, research institutions and industry. and also Ph.D~ students. Some participants presented papers during the Institute reporting the state-of-art of their research projects. All the sessions wel'e very active and quite extensive discussions on scientific aspects took place during the Institute. The Advanced Study Institute provided a forum for interaction among eminent scientists and engineers. from different schools of thought and young researchers. The Institute addressed the foundations and current state of the art of essential aspects related to fatigue science and technology, namely: Short Cracks, Metallurgical Aspects, Environmental Fatigue, Threshold Behaviour, Notch Behaviour. Creep and Fatigue Interactions at High Temperature, Multiaxial Fatigue, Low Cycle Fatigue, Methodology of Fatigue Testing, Variable Amplitude Fatigue, Fatigue of Advanced Materials. Elastic-Plastic Fatigue, and several engineering applications such as welded joints, energy systems, offshore structures, automotive industry, machine and engine components. This book is organized in three parts: Part I: Fundamentals of Fatigue Part II: Engineering Applications Part III: Research Contributions The research contributions covered most of the areas referred above.
