Advanced Modeling For Fatigue Growth Of Small Surface Cracks
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Advanced Modeling For Fatigue Growth Of Small Surface Cracks
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Author : T. A. Cruse
language : en
Publisher:
Release Date : 1988
Advanced Modeling For Fatigue Growth Of Small Surface Cracks written by T. A. Cruse and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Fracture mechanics categories.
The primary result of the sponsored research is the development and application of the boundary element method for two- and three-dimensional fatigue crack growth analysis. The two-dimensional formulation developed previously (AFOSR Contract No. F49620-84-C-0042) was extended to investigate the crack tip behavior of long and short cracks under cyclic loading. The influence of residual plasticity on stress intensity factor was used to obtain an unambiguous estimate of the plastic zone size. It was demonstrated that the effect of the plastic wake on the stress intensity factor for crack opening (closure) and the effect of the residual stress on the retardation are identical manifestations of the same plasticity process. The boundary integral equations also provide insight to the mathematical equivalence of these two effects. Keywords: Fracture mechanics, Fatigue crack growth, Crack retardation, Crack closure, Crack opening displacement, Boundary element method. (jes).
Constraint Loss Model For The Growth Of Surface Fatigue Cracks
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Author : RH. Van Stone
language : en
Publisher:
Release Date : 1988
Constraint Loss Model For The Growth Of Surface Fatigue Cracks written by RH. Van Stone and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Fatigue crack growth categories.
As surface flaws grow in high-strength nickel-base superalloys, the growth along the free surface (dc/dN) can be much slower than growth in the depth direction (da/dN), even after accounting for variations in K along the crack front. This behavior reduces the crack aspect ratio (c/a) and can result in the formation of stable shear lips at the free surface during fatigue crack growth. Trantina et al. recently performed elastic-plastic finite-element analyses of surface cracks which showed that as the applied stress approached the elastic limit, a relatively large region of constraint loss was observed where the crack front intersects the free surface. This concept was used to develop a constraint-loss modification to the Newman-Raju K solution for the surface flaw problem. This model has been applied to physically small surface crack growth in the advanced nickel-base superalloy René 95. The predicted results match the dc/dN data, which are slower than and not parallel to the corresponding da/dN-K data. This model has been combined with a dual-Walker exponent approach to model nonzero stress (R) ratios. This methodology has been used to predict the residual lives of surface flaws growing in both uniform and nonuniform stress fields within a factor of two of the experimentally observed lives. This model has also been successfully applied to small surface flaws and can predict the lives of cracks with depths (a) as small as 65 ?m (0.0025 in.).
Advanced Three Dimensional Simulations And Cohesive Modeling Of Fatigue Crack Growth
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Author : Ani Ural
language : en
Publisher:
Release Date : 2004
Advanced Three Dimensional Simulations And Cohesive Modeling Of Fatigue Crack Growth written by Ani Ural and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Small Fatigue Cracks
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Author : K.S. Ravichandran
language : en
Publisher: Elsevier
Release Date : 1999-09-30
Small Fatigue Cracks written by K.S. Ravichandran and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-09-30 with Technology & Engineering categories.
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.
Methods And Models For Predicting Fatigue Crack Growth Under Random Loading
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Author : J. B. Chang
language : en
Publisher: ASTM International
Release Date : 1981
Methods And Models For Predicting Fatigue Crack Growth Under Random Loading written by J. B. Chang and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Technology & Engineering categories.
Fatigue Life And Crack Growth Prediction Methodology
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Author : J. C. Newman (Jr)
language : en
Publisher:
Release Date : 1993
Fatigue Life And Crack Growth Prediction Methodology written by J. C. Newman (Jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
Mechanics Of Fatigue Crack Closure
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Author : Wolf Elber
language : en
Publisher: ASTM International
Release Date : 1988
Mechanics Of Fatigue Crack Closure written by Wolf Elber and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Fracture mechanics categories.
Fatigue Crack Growth Thresholds Endurance Limits And Design
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Author : J. C. Newman
language : en
Publisher: ASTM International
Release Date : 2000
Fatigue Crack Growth Thresholds Endurance Limits And Design written by J. C. Newman and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Fatigue categories.
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.
Multiscale Fatigue Crack Initiation And Propagation Of Engineering Materials Structural Integrity And Microstructural Worthiness
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Author : George C. Sih
language : en
Publisher: Springer
Release Date : 2010-10-28
Multiscale Fatigue Crack Initiation And Propagation Of Engineering Materials Structural Integrity And Microstructural Worthiness written by George C. Sih and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-10-28 with Technology & Engineering categories.
What can be added to the fracture mechanics of metal fatigue that has not already been said since the 1900s? From the view point of the material and structure engineer, there are many aspects of failure by fatigue that are in need of attention, particularly when the size and time of the working components are changed by orders of magnitude from those considered by st traditional means. The 21 century marks an era of technology transition where structures are made larger and devices are made smaller, rendering the method of destructive testing unpractical. While health monitoring entered the field of science and engineering, the practitioners are discovering that the correlation between the signal and the location of interest depends on a priori knowledge of where failure may initiate. This information is not easy to find because the integrity of the physical system will change with time. Required is software that can self-adjust in time according to the monitored data. In this connection, effective application of health monitoring can use a predictive model of fatigue crack growth. Earlier fatigue crack growth models assumed functional dependence on the maximum stress and the size of the pre-existing crack or defect. Various possibilities were examined in the hope that the data could be grouped such that linear interpolation would apply.
Growth Of Surface Cracks Under Fatigue And Monotonic Increasing Load
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Author : L. Hodulak
language : en
Publisher:
Release Date : 1990
Growth Of Surface Cracks Under Fatigue And Monotonic Increasing Load written by L. Hodulak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Constraint categories.
An engineering assessment of the life time and failure conditions for components with surface cracks can be easily done using a personal computer program. The methods, assumptions and the modeling of surface crack growth used in the program are briefly described.