Physically Based Models For Creep Fatigue Crack Initiation And Growth
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Physically Based Models For Creep Fatigue Crack Initiation And Growth
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Author : David L. McDowell
language : en
Publisher:
Release Date : 2003
Physically Based Models For Creep Fatigue Crack Initiation And Growth written by David L. McDowell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Physically Based Models For Elevated Temperature Low Cycle Fatigue Crack Initiation And Growth In Rene
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Author : Kip Owen Findley
language : en
Publisher:
Release Date : 2005
Physically Based Models For Elevated Temperature Low Cycle Fatigue Crack Initiation And Growth In Rene written by Kip Owen Findley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Elastomers categories.
The aircraft engine industry is constantly striving to increase the operating temperature and stresses in hot section engine components, a goal that can only be achieved by accurately modeling and predicting damage mechanisms of potential engine materials. The objective of this work is to develop physically-based models that are able to accurately predict the high temperature crack initiation behavior of Rene 88DT, a commonly used aircraft engine disk material, under low cycle fatigue (LCF) conditions. Two different microstructural conditions were produced by subjecting the material to two separate heat treatments; the heat treatments were selected so that grain size remains the same but the size distribution of the strengthening gamma prime precipitate is different between the two conditions. LCF experiments were performed on specimens from each condition at 650C and R = -1 under strain ranges of 0.66%, 0.75%, and 1.5%. A third microstructural condition with a similar grain size but different gamma prime size distribution was tested by another source at 650C and R = 0 under strain ranges of 0.66%, 0.79%, 0.94%, and 1.14%. The results indicate that there are two competing crack initiation mechanisms: initiation from a microstructural defect such as an inclusion and initiation from slip band cracking. A physically based model, in the form of a modified Fatemie-Socie parameter, is utilized to predict the crack initiation mechanism and approximate cycles to failure based on the microstructure of the material and applied strain. Long crack growth models are also developed to model crack growth from subsurface inclusions and surface semi-elliptical cracks. These models predict that long crack growth is a small portion of the total fatigue life in these conditions, which suggests that the majority of the fatigue life is spent initiating a dominant fatigue crack.
Stochastic Modeling Of Crack Initiation And Short Crack Growth Under Creep And Creep Fatigue Conditions
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Author :
language : en
Publisher:
Release Date : 1989
Stochastic Modeling Of Crack Initiation And Short Crack Growth Under Creep And Creep Fatigue Conditions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
Characterizations Of Creep Fatigue Crack Initiation And Growth Life For P92 Using Circular Notched Round Bar Specimen
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Author : R. Sugiura
language : en
Publisher:
Release Date : 2012
Characterizations Of Creep Fatigue Crack Initiation And Growth Life For P92 Using Circular Notched Round Bar Specimen written by R. Sugiura and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Crack growth life categories.
A testing method under creep-fatigue interaction conditions has been proposed as the ASTM standard E2714-09. In accordance with the ASTM standard, round bar smooth specimens have been recommended as a testing specimen. Additionally, creep-fatigue crack initiation and growth life are usually defined as the attainment of a specific rate of decrease in the maximum tensile stress or the modulus of elasticity ratios. However, these criterions of crack initiation and growth life on ASTM standard are not characterized in terms of physical crack size. In this study, the creep-fatigue crack initiation and growth tests for P92 were conducted using circular notched round bar specimens. An attempt is made to measure the crack length during the tests by the direct current potential drop method, which results in the establishment of a high accuracy crack length measurement. Additionally, the life of creep-fatigue crack growth was characterized by linear cumulative damage law combined with the Q*concept which has been proposed as fracture parameter to describe the life of creep crack growth.
Metal Plasticity And Fatigue At High Temperature
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Author : Denis Benasciutti
language : en
Publisher: MDPI
Release Date : 2020-05-20
Metal Plasticity And Fatigue At High Temperature written by Denis Benasciutti and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-05-20 with Technology & Engineering categories.
In several industrial fields (such as automotive, steelmaking, aerospace, and fire protection systems) metals need to withstand a combination of cyclic loadings and high temperatures. In this condition, they usually exhibit an amount—more or less pronounced—of plastic deformation, often accompanied by creep or stress-relaxation phenomena. Plastic deformation under the action of cyclic loadings may cause fatigue cracks to appear, eventually leading to failures after a few cycles. In estimating the material strength under such loading conditions, the high-temperature material behavior needs to be considered against cyclic loading and creep, the experimental strength to isothermal/non-isothermal cyclic loadings and, not least of all, the choice and experimental calibration of numerical material models and the selection of the most comprehensive design approach. This book is a series of recent scientific contributions addressing several topics in the field of experimental characterization and physical-based modeling of material behavior and design methods against high-temperature loadings, with emphasis on the correlation between microstructure and strength. Several material types are considered, from stainless steel, aluminum alloys, Ni-based superalloys, spheroidal graphite iron, and copper alloys. The quality of scientific contributions in this book can assist scholars and scientists with their research in the field of metal plasticity, creep, and low-cycle fatigue.
Methods And Models For Predicting Fatigue Crack Growth Under Random Loading
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Author :
language : en
Publisher: ASTM International
Release Date :
Methods And Models For Predicting Fatigue Crack Growth Under Random Loading written by and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Design For Creep
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Author : R.K. Penny
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Design For Creep written by R.K. Penny and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
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.
Comprehensive Structural Integrity
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Author : Ian Milne
language : en
Publisher: Elsevier
Release Date : 2003-07-25
Comprehensive Structural Integrity written by Ian Milne and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-07-25 with Business & Economics categories.
The aim of this major reference work is to provide a first point of entry to the literature for the researchers in any field relating to structural integrity in the form of a definitive research/reference tool which links the various sub-disciplines that comprise the whole of structural integrity. Special emphasis will be given to the interaction between mechanics and materials and structural integrity applications. Because of the interdisciplinary and applied nature of the work, it will be of interest to mechanical engineers and materials scientists from both academic and industrial backgrounds including bioengineering, interface engineering and nanotechnology. The scope of this work encompasses, but is not restricted to: fracture mechanics, fatigue, creep, materials, dynamics, environmental degradation, numerical methods, failure mechanisms and damage mechanics, interfacial fracture and nano-technology, structural analysis, surface behaviour and heart valves. The structures under consideration include: pressure vessels and piping, off-shore structures, gas installations and pipelines, chemical plants, aircraft, railways, bridges, plates and shells, electronic circuits, interfaces, nanotechnology, artificial organs, biomaterial prostheses, cast structures, mining... and more. Case studies will form an integral part of the work.
Creep And Creep Fatigue Crack Growth Modeling And Testing Methods Relevant To Life Assessment Of Cracked Components
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Author : K. M. Nikbin
language : en
Publisher:
Release Date : 2006-06-01
Creep And Creep Fatigue Crack Growth Modeling And Testing Methods Relevant To Life Assessment Of Cracked Components written by K. M. Nikbin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-06-01 with categories.
Fatigue Crack Growth
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Author : Hans Albert Richard
language : en
Publisher: Springer
Release Date : 2016-06-21
Fatigue Crack Growth written by Hans Albert Richard and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-06-21 with Technology & Engineering categories.
This book offers a concise introduction to fatigue crack growth, based on practical examples. It discusses the essential concepts of fracture mechanics, fatigue crack growth under constant and variable amplitude loading and the determination of the fracture-mechanical material parameters. The book also introduces the analytical and numerical simulation of fatigue crack growth as well as crack initiation. It concludes with a detailed description of several practical case studies and some exercises. The target group includes graduate students, researchers at universities and practicing engineers.