Mechanism Based Models Of Fatigue Crack Growth
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Mechanism Based Models Of Fatigue Crack Growth
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Author : Sassan Steven Shademan
language : en
Publisher:
Release Date : 2000
Mechanism Based Models Of Fatigue Crack Growth written by Sassan Steven Shademan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
A Multi Mechanism Strip Yield Model For Fatigue Crack Growth
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Author : Alberto Castro
language : en
Publisher:
Release Date : 2009
A Multi Mechanism Strip Yield Model For Fatigue Crack Growth written by Alberto Castro and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Dissertations, Academic categories.
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.
Probabilistic Prediction Of Crack Growth Based On Creep Fatigue Damage Accumulation Mechanism
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Author : Zhigang Wei
language : en
Publisher:
Release Date : 2011
Probabilistic Prediction Of Crack Growth Based On Creep Fatigue Damage Accumulation Mechanism written by Zhigang Wei and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Crack growth categories.
In this paper a deterministic creep/fatigue accumulation model from simple sequential and repetitive creep and fatigue crack growth mechanisms for creep-brittle materials is developed. In the model the maximum stress intensity factor and stress intensity factor range can be used to describe, respectively, the creep and fatigue crack growth behaviors. The probabilistic behavior of the combined creep-fatigue can be calculated by direct integration of a joint log-normal probability density function or other methods. The Monte Carlo simulation method is used in this paper to analyze the probabilistic behavior of the derived deterministic creep-fatigue model and to estimate the reliability of a creep-fatigue correlation as introduced by the uncertainties in both creep and fatigue lives. Predicted results from this new crack growth method are compared with the bi-linear creep-fatigue interaction models as adopted by ASME Code Case N-47 and API579/ASME FFS, and the results are discussed.
Fatigue Of Materials At Very High Numbers Of Loading Cycles
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Author : Hans-Jürgen Christ
language : en
Publisher: Springer
Release Date : 2018-11-19
Fatigue Of Materials At Very High Numbers Of Loading Cycles written by Hans-Jürgen Christ and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-19 with Technology & Engineering categories.
This book represents the final reports of the scientific projects funded within the DFG-SPP1466 and, hence, provides the reader with the possibility to familiarize with the leading edge of VHCF research. It draws a balance on the existing knowledge and its enhancement by the joint research action of the priority program. Three different material classes are dealt with: structural metallic materials, long-fiber-reinforced polymers and materials used in micro-electro-mechanical systems. The project topics address the development of suitable experimental techniques for high-frequency testing and damage monitoring, the characterization of damage mechanisms and damage evolution, the development of mechanism-based models and the transfer of the obtained knowledge and understanding into engineering regulations and applications.
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.
A Slip Band Based Cohesive Zone Model For Simulation Of Fatigue Crack Growth At Sub Micron Level
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Author :
language : en
Publisher:
Release Date : 2010
A Slip Band Based Cohesive Zone Model For Simulation Of Fatigue Crack Growth At Sub Micron Level written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Cracking process categories.
A better understanding of load sequence effect on fatigue crack growth in metallic materials is needed to achieve more accurate predictions of fatigue life for RAAF aircraft. This study develops a modelling capability to further the understanding of fatigue mechanisms at a micro-level under variable amplitude loading. A slip-band damage accumulation (sDA) model is proposed as the underlying mechanism to account for both micro-crack path deviation and crack growth acceleration following an underload. The proposed model is implemented using a slip-bandbased cohesive zone model (sCZM), integrated in the ABAQUS/Standard finite element software suite using element and external database user subroutines. Demonstration case studies are performed on a single-edge-cracked rectangular plate under remote cyclic loads. The sDA model, implemented using a sCZM, is shown to reasonably explain the experimentally observed coexistence of crack path deviation and accelerated crack growth following an underload. The sCZM simulations are demonstrated to be a useful tool in gaining further understanding of fatigue crack growth mechanisms at a micro-level. Future applications have been proposed along with appropriate key code developments.
Fatigue Crack Growth
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Author : Ping Tang
language : en
Publisher: Nova Science Publishers
Release Date : 2012
Fatigue Crack Growth written by Ping Tang and has been published by Nova Science Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Fracture mechanics categories.
In this book, the authors present current research in the study of the mechanisms, behaviour and analysis of fatigue crack growths. Topics discussed in this compilation include the unified fatigue crack growth rate model; practical tools for statistical fatigue design; probablistic algorithms performance evaluation and application in multi-fractured structures; three dimensional effects in the fracture mechanics of bi-dimensional specimens; fatigue crack propagation mechanism in porous open pore metal foams; lifetime predictions for short fatigue crack's initiation-propagation by basic mechanical properties; variable amplitude fatigue crack growth in selected aluminium alloys; fatigue threshold R-curves for analysis of short fatigue cracks; and multiaxial fatigue life prediction for lateral notched round bars made of high strength steel.
Mechanisms And Modelling Of Environment Dependent Fatigue Crack Growth In A Nickel Based Superalloy
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Author : H. Ghonem
language : en
Publisher:
Release Date : 1991
Mechanisms And Modelling Of Environment Dependent Fatigue Crack Growth In A Nickel Based Superalloy written by H. Ghonem and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
At loading frequencies below that of the transitional frequency level, which is typical of mission cycles of jet engines, the elevated temperature fatigue crack growth process in Alloy 718 is viewed to be fully environment-dependent. Of all the crack growth stages, this process, while is the most critical in high temperature application due to its highly accelerated crack growth rate, is the least studied or understood. The objective of this research program is to focus on the understanding or the mechanism controlling this oxidation-dependent stage in order to develop the ability to predict its associated crack growth performance under different environment conditions. For this purpose, three major studies have been carried out; the first was to provide evidence of the existence of the fully environment-dependent stage in which the crack growth rate would be equal to the oxygen penetration rate at the crack tip. The second study was to establish a crack tip oxidation mechanism on the basis of material, environmental and loading parameters interactions in the crack tip region. The last objective of this program is to establish a micromechanical based quantitative model to predict the environmentally-dominated crack growth stage.
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.