Three Dimensional Finite Element Simulation Of Fatigue Crack Growth And Closure
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Three Dimensional Finite Element Simulation Of Fatigue Crack Growth And Closure
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Author : Stephen G. Cupschalk
language : en
Publisher:
Release Date : 1987
Three Dimensional Finite Element Simulation Of Fatigue Crack Growth And Closure written by Stephen G. Cupschalk and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Stress corrosion categories.
Three Dimensional Finite Element Simulation Of Fatigue Crack Growth And Closure
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Author : Stephen G. Cupschalk
language : en
Publisher:
Release Date : 1987
Three Dimensional Finite Element Simulation Of Fatigue Crack Growth And Closure written by Stephen G. Cupschalk and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Stress corresion categories.
Three Dimensional Elastic Plastic Finite Element Analysis Of Fatigue Crack Growth And Closure
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Author : Rahmatollah Ghadimi Chermahini
language : en
Publisher:
Release Date : 1986
Three Dimensional Elastic Plastic Finite Element Analysis Of Fatigue Crack Growth And Closure written by Rahmatollah Ghadimi Chermahini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Materials categories.
Finite Element Analysis Of Plasticity Induced Fatigue Crack Closure In Three Dimensional Cracked Geometries
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Author :
language : en
Publisher:
Release Date : 2001
Finite Element Analysis Of Plasticity Induced Fatigue Crack Closure In Three Dimensional Cracked Geometries written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Elastic-plastic finite element analyses were performed to predict the crack opening level profiles in semi-elliptical surface cracks. A script was written to use the commercial finite element code ANSYS to predict opening levels in cracked geometries. The functionality of the scripts was verified by comparing predicted opening levels in two and three-dimensional center-cracked geometries to experimental results. In addition, a parameter study was performed in which various aspects of the modeling routine were modified. This included a mesh refinement study as well as a study into the effect of a strain hardening material. The main focus of the current research, however, is to compare finite element predicted opening levels with published opening levels determined experimentally. Due to the complexities and long run-times involved with these models, no attempt was made at growing the cracks from initial length to final length. Instead, discrete crack lengths at which experimental opening levels were published were instead used. Also, no attempt was made to predict the crack aspect ratio evolution. The finite element predicted opening levels were in all cases significantly lower than those reported experimentally, however, similar trends in both crack opening level profile along the crack front, and opening level variations with crack growth were shown.
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.
Finite Element Analysis Of Plasticity Induced Fatigue Crack Closure In Three Dimensional Cracked Geometries
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Author : Jeffrey David Skinner
language : en
Publisher:
Release Date : 2001
Finite Element Analysis Of Plasticity Induced Fatigue Crack Closure In Three Dimensional Cracked Geometries written by Jeffrey David Skinner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Finite element method categories.
[3] The finite element predicted opening levels were in all cases significantly lower than those reported experimentally, however, similar trends in both crack opening level profile along the crack front, and opening level variations with crack growth were shown.
Modeling Of Three Dimensional Effects On Fatigue Crack Closure Processes In Small Scale Yielding
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Author : RH. Dodds
language : en
Publisher:
Release Date : 2005
Modeling Of Three Dimensional Effects On Fatigue Crack Closure Processes In Small Scale Yielding written by RH. Dodds and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Contact categories.
In ductile metals, plasticity-induced closure of fatigue cracks often retards significantly measured crack growth rates in the Paris regime and contributes strongly to the observed R-ratio effect in experimental data. This work describes a similarity scaling relationship based on the 3D small-scale yielding framework wherein the thickness, B, defines the only geometric length-scale of the model. Dimensional analysis suggests a scaling relationship for the crack opening loads relative to the maximum cyclic loads (Kop/Kmax) governed by the non-dimensional load parameter ̄K=Kmax/?0 ?B, i.e., a measure of the in-plane plastic zone size normalized by the thickness. Both Kop and Kmax refer to remotely applied values of the mode I stress-intensity factor. Large-scale, 3D finite element analyses described here demonstrate that Kop/Kmax values vary strongly across the crack front in thin sheets but remain unchanged when Kmax, B, and ?0 vary to maintain ̄K = constant. The paper also includes results to demonstrate that the scaling relationship holds for non-zero values of the T-stress (which affect the Kop/Kmax values) and for an overload interspersed in the otherwise constant amplitude cycles. The present results focus on R = Kmin/Kmax = 0 loading, although the scaling relationship has been demonstrated to hold for other R > 0 loadings as well. The new similarity scaling relationship makes possible more realistic estimates of crack closure loads for a very wide range of practical conditions from just a few analyses of the type described here.
Three Dimensional Finite Element Analysis Of Cyclic Fatigue Crack Growth Of Multiple Surface Flaws
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Author : Corneliu Manu
language : en
Publisher:
Release Date : 1980
Three Dimensional Finite Element Analysis Of Cyclic Fatigue Crack Growth Of Multiple Surface Flaws written by Corneliu Manu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Finite element method categories.
Fatique And Fracture Mechanics
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Author : Gary R. Halford
language : en
Publisher: ASTM International
Release Date : 2000
Fatique And Fracture Mechanics written by Gary R. Halford 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.
Extended Finite Element Predictions For Three Dimensional Modeling Of Fatigue Crack Growth In Cold Worked Holes
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Author : Mohammad Salman Yasin
language : en
Publisher:
Release Date : 2020
Extended Finite Element Predictions For Three Dimensional Modeling Of Fatigue Crack Growth In Cold Worked Holes written by Mohammad Salman Yasin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Steel categories.
Cold working has been widely used for enhancing the fatigue life of open holes. The process imparts compressive residual stresses around the hole which slows down the progression of crack under cyclic loading conditions. In the present study, fatigue crack growth in open holes in R260 grade steel, a typical railroad material, has been analyzed using the Extended Finite Element Method (XFEM). Along with the experimental studies, numerical simulation emerges as a powerful tool to predict the fatigue crack growth in rail steel and may deliver important insights to consider more situations by saving time and cost. XFEM modifies the standard displacement-based approximation by adding enrichment functions in the crack region. The investigation explored the capability of the XFEM, for a plate containing plain hole (baseline), pad coined, or split-sleeve cold-worked hole using the commercial finite element package, Abaqus, as a means of fatigue crack growth under constant amplitude loading. The effect of residual stress redistribution has been added to the numerical model to accurately predict the crack evolution. Stress Intensity Factors (SIF) are obtained from the XFEM calculations and the crack growth is estimated until the SIF reaches the fracture toughness of the modeled coupon material. The obtained simulation results are in good agreement with the fatigue experimental results in terms of the fatigue crack growth rates for plain hole (baseline), pad coined, or split-sleeve cold-worked holes. Results from the performed analysis show that cold working of an open hole increases the fatigue life when compared to the one without residual stresses due to the delay of crack initiation and propagation. The results also indicated fatigue life increase almost by a factor of three during crack propagation due to split-sleeve cold expansion in correlation to the baseline and pad coined sample.