Modeling Of Environmentally Assisted Fatigue Crack Growth Behavior

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Modeling of Environmentally Assisted Fatigue Crack Growth Behavior

Author : Phani Chandar Reddy Sree
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.:/5 (913 download)

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Book Synopsis Modeling of Environmentally Assisted Fatigue Crack Growth Behavior by : Phani Chandar Reddy Sree

Download or read book Modeling of Environmentally Assisted Fatigue Crack Growth Behavior written by Phani Chandar Reddy Sree and published by . This book was released on 2015 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The formation of fatigue cracks and their propagation due to cyclic loading in metals have been a concern for more than hundred years. Since fatigue failure were first reported by the railroad industry in 1840s, tremendous progress has been achieved in understanding fatigue behavior of metals. But fatigue damage is still a concern due to its complex dependency on various environmental variable like humidity, temperature, time and corrosive environment. Although numerous theories and models have been proposed in the past, the effects of environment on fatigue crack growth (FCG) is not completely understood. This dissertation aims to shed light on the effect of environment on the FCG behavior in metals through experimental techniques (Part-I) and modeling (Part- II). Using the available concepts in literature and the generated experimental data, a new fatigue model is proposed which accounts for thickness, stress ratio and environmental effects on FCG behavior. The slow-strain-rate tests revealed that the effect of liquid-air interface on tensile behavior of Al 7075-T651 can be explained by a concept of chemical notch at the liquid-air interface. The FCG behavior of Al 7075-T651 alloy in air and in vacuum were investigated by using an earlier developed custom matrix method based on [delta]K and Kmax. The FCG data generated revealed the influence of stress ratio,(R), thickness and environment (air and vacuum) on FCG behavior. A new FCG model presented in Part-II includes the environmental effect through change in crack tip angle. In this model the mechanical fatigue damage is based on the two parameter approach, [delta]K and Kmax. The model predictions of R-ratio, thickness and environment effects on FCG behavior in metals is compared with available data published in the literature and fairly good agreement was found.

Modeling Environmental Effects on Crack Growth Processes

Author : Metallurgical Society of AIME. Corrosion and Environmental Effects Committee
Publisher : Society for Mining Metallurgy & Exploration
ISBN 13 :
Total Pages : 410 pages
Book Rating : 4.:/5 (89 download)

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Book Synopsis Modeling Environmental Effects on Crack Growth Processes by : Metallurgical Society of AIME. Corrosion and Environmental Effects Committee

Download or read book Modeling Environmental Effects on Crack Growth Processes written by Metallurgical Society of AIME. Corrosion and Environmental Effects Committee and published by Society for Mining Metallurgy & Exploration. This book was released on 1986 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Environmentally Assisted Cracking

Author : W. Barry Lisagor
Publisher : ASTM International
ISBN 13 : 0803112769
Total Pages : 540 pages
Book Rating : 4.8/5 (31 download)

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Book Synopsis Environmentally Assisted Cracking by : W. Barry Lisagor

Download or read book Environmentally Assisted Cracking written by W. Barry Lisagor and published by ASTM International. This book was released on 1990 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers included topics of phenomena, basic mechanisms, modeling, test methodologies, materials performance, engineering applications and service experience and failures and reflects the current emphasis with regard to material/environment systems.

Computer Modeling the Fatigue Crack Growth Rate Behavior of Metals in Corrosive Environments

Author :
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Computer Modeling the Fatigue Crack Growth Rate Behavior of Metals in Corrosive Environments by :

Download or read book Computer Modeling the Fatigue Crack Growth Rate Behavior of Metals in Corrosive Environments written by and published by . This book was released on 1994 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Study of Near Threshold Fatigue Crack Growth in Vacuum and Environment Using Multiscale Atomistic Modeling

Author : Mingjie Zhao
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Study of Near Threshold Fatigue Crack Growth in Vacuum and Environment Using Multiscale Atomistic Modeling by : Mingjie Zhao

Download or read book Study of Near Threshold Fatigue Crack Growth in Vacuum and Environment Using Multiscale Atomistic Modeling written by Mingjie Zhao and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation is composed of three papers and related unpublished work providing a foundation that helps understand near threshold fatigue crack growth in both vacuum and environment conditions in the atomic scale. All studies are made possible by utilization of a recent implementation of the multiscale coupled atomistic and discrete dislocation (LF-CADD) methodology. First, near threshold fatigue crack growth of a ductile material in vacuum is investigated via atomistic modeling of dislocation motions and slip interactions. The simulation results indicate that sustained fatigue crack growth in vacuum requires emitted dislocations to change slip planes prior to their reabsorption into the crack on the opposite side of the loading cycle. This finding assesses the validity of long-hypothesized material separation mechanisms using state-of-the-art computational resources, conforms to reports of crack growth below experimentally assisted fatigue crack growth thresholds, and opens the door for improved prognosis and the design of novel fatigue resistance alloys. Second, the role of material dissolution is studied for intrinsically ductile and semi-brittle materials isolated from other environmentally assisted fatigue crack growth mechanisms. The multiscale simulations and subsequent analysis suggest that dissolution can be dual natured depending on the material. For a ductile material, dissolution at crack tip acts to blunt the crack with increasing crack tip opening displacement (CTOD). On the other hand, dissolution will work as a driving force for a slow growing in a brittle and semi-brittle material where the crack remains atomically sharp. The latter will eventually trigger brittle, unstable crack propagation as the applied load exceeds a critical threshold. Third, a crack with surface film is studied under mode I fatigue loading. Using our concurrent multiscale LF-CADD model, we conduct a series of simulations with varying loading conditions and find that the crack grows via film rupture mechanism, which requires film thickness and brittleness. Surface film swelling is needed to produce experimentally observed R-effect on $\Delta K$ threshold. In order to achieve sustained fatigue crack growth, a critical K ($K_{max}$) is necessary to overcome the compressive stress ahead of the crack tip at the bottom of the loading cycle due to film swelling.

Empirical Modeling of Environment-enhanced Fatigue Crack Propagation in Structural Alloys for Component Life Prediction

Author :
Publisher :
ISBN 13 :
Total Pages : 178 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Empirical Modeling of Environment-enhanced Fatigue Crack Propagation in Structural Alloys for Component Life Prediction by :

Download or read book Empirical Modeling of Environment-enhanced Fatigue Crack Propagation in Structural Alloys for Component Life Prediction written by and published by . This book was released on 1995 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fatigue Crack Growth Behavior of a Mn-Ni-Cr Steel in 3.5 % NaCl Medium and Its Modeling

Author : Dhinakaran Sampath
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Fatigue Crack Growth Behavior of a Mn-Ni-Cr Steel in 3.5 % NaCl Medium and Its Modeling by : Dhinakaran Sampath

Download or read book Fatigue Crack Growth Behavior of a Mn-Ni-Cr Steel in 3.5 % NaCl Medium and Its Modeling written by Dhinakaran Sampath and published by . This book was released on 2019 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the fatigue crack growth behavior of marine steel at low frequencies in a corrosive environment under cathodic protection is essential for the design and prognosis of offshore structures. Experimental results demonstrate that the corrosion fatigue crack growth rate increases with a decrease in frequency, and this behavior can be mitigated by reducing the corrosion rates with the application of a cathodic potential. Knowledge of an optimum cathodic protection potential for corrosion fatigue crack growth without entering the domain of hydrogen-assisted cracking potentials is vital. To that end, the corrosion processes within the enclave of a stationary crack and a pulsating fatigue crack under different crack mouth potentials are elucidated through modeling of mass transport of electrolytic species and electrode reactions. Effect of crack tip strain enhanced electrochemical reaction rates on electrochemical parameters such as pH, potential, and corrosion current density at the crack tip is evaluated. The corrosion current density at the crack tip is reduced significantly when the applied crack mouth potential is changed from -550 to -1,050 mV SCE for both stationary and pulsating cracks. In the case of strain-enhanced corrosion processes, the corrosion current density is increased significantly when compared with the equivalent model without considering the straining effects. However, the corrosion current density is the same for the applied crack mouth potential below -900 mV SCE. The crack solution becomes alkaline as the crack tip pH increases with a decrease in cathodic potential. This result agrees with the experimental observation of the minimum corrosion fatigue crack growth rate of a steel in sodium chloride solution at around -900 and -950 mV SCE.

Computer Modeling the Fatigue Crack Growth Rate Behavior of Metals in Corrosive Environments

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722974381
Total Pages : 186 pages
Book Rating : 4.9/5 (743 download)

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Book Synopsis Computer Modeling the Fatigue Crack Growth Rate Behavior of Metals in Corrosive Environments by : National Aeronautics and Space Administration (NASA)

Download or read book Computer Modeling the Fatigue Crack Growth Rate Behavior of Metals in Corrosive Environments written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this task was to develop a method to digitize FCP (fatigue crack propagation) kinetics data, generally presented in terms of extensive da/dN-Delta K pairs, to produce a file for subsequent linear superposition or curve-fitting analysis. The method that was developed is specific to the Numonics 2400 Digitablet and is comparable to commercially available software products as Digimatic(sup TM 4). Experiments demonstrated that the errors introduced by the photocopying of literature data, and digitization, are small compared to those inherent in laboratory methods to characterize FCP in benign and aggressive environments. The digitizing procedure was employed to obtain fifteen crack growth rate data sets for several aerospace alloys in aggressive environments. Richey, Edward, III and Wilson, Allen W. and Pope, Jonathan M. and Gangloff, Richard P. Unspecified Center COMPUTERIZED SIMULATION; CRACK INITIATION; CRACK PROPAGATION; FATIGUE (MATERIALS); INTERPOLATION; METAL FATIGUE; STRESS CORROSION CRACKING; APPLICATIONS PROGRAMS (COMPUTERS); CURVE FITTING; FATIGUE TESTS; SPACECRAFT CONSTRUCTION MATERIALS...

Fracture Mechanics:fourteenth Symposium Volume 1: Theory and Analysis

Author :
Publisher : ASTM International
ISBN 13 :
Total Pages : 615 pages
Book Rating : 4./5 ( download)

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Book Synopsis Fracture Mechanics:fourteenth Symposium Volume 1: Theory and Analysis by :

Download or read book Fracture Mechanics:fourteenth Symposium Volume 1: Theory and Analysis written by and published by ASTM International. This book was released on with total page 615 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Basic Fracture Mechanics and its Applications

Author : Ashok Saxena
Publisher : CRC Press
ISBN 13 : 1000823741
Total Pages : 343 pages
Book Rating : 4.0/5 (8 download)

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Book Synopsis Basic Fracture Mechanics and its Applications by : Ashok Saxena

Download or read book Basic Fracture Mechanics and its Applications written by Ashok Saxena and published by CRC Press. This book was released on 2022-12-27 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1) Includes a chapter on early theories on fracture as well as modern understandings 2) Contains a chapter on fatigue crack and creep fatigue crack 3) Provides an in-depth discussion of both linear elastic and nonlinear fracture mechanics 4) Includes both solved and unsolved example problems and end of chapter problems, and instructor support materials are also available

Illuminating the Chemo-mechanics of Environment Assisted Fatigue in Aluminum

Author : Richard James Zamora
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (919 download)

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Book Synopsis Illuminating the Chemo-mechanics of Environment Assisted Fatigue in Aluminum by : Richard James Zamora

Download or read book Illuminating the Chemo-mechanics of Environment Assisted Fatigue in Aluminum written by Richard James Zamora and published by . This book was released on 2015 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation composes three papers detailing work intended to illuminate the atomistic-scale mechanisms governing environment assisted fatigue crack growth in aluminum. All studies focus on the application of concurrent atomistic-continuum multiscale modeling, utilizing the coupled atomistic and discrete dislocation (CADD) methodology. First, an ab-initio prediction of environmental embrittlement in aluminum is demonstrated using a density functional theory (DFT) based multiscale framework to simulate the behavior of a loaded crack-tip in the presence of both elemental oxygen and hydrogen impurities. The multiscale simulations and subsequent analysis suggest that electronegative surface impurities can inhibit dislocation nucleation from a crack-tip, which is consistent with macroscopic brittle failure. Second, a series of ab-initio and multiscale simulations are performed, directly linking an atomistic mechanism of hydrogen-assisted cracking (HAC) to experimental fatigue data. The mechanism of enhanced surface deformation is demonstrated using an aluminum-only interatomic potential capable of reproducing ab-initio trends by strategically shielding critical surface bonds in accordance with the environmental exposure level. The strategic shielding approach is used within a CADD-based model to predict an embrittling effect of hydrogen on near threshold fatigue crack growth rates. Third, a CADD-based model is used to simulate the approximate effects of monolayer surface layer stiffening on near-threshold fatigue behavior in aluminum. Stiff surface layer effects are investigated by adding a Lennard-Jones overlay potential to exposed aluminum crack-face atoms. For the single crystal orientation studied, we find that deformation behavior generally begins with a short period of fast transient crack-tip propagation until a stable defect structure has accumulated ahead of the crack. Additionally, the approximate effects of stiff monolayer surface-film formation are found to inhibit crack growth by resisting typical slip-plane cracking behavior. For all studies, the results are discussed in terms of the current environment assisted fatigue literature.

Environment Enhanced Fatigue Crack Propagation in Metals: Inputs to Fracture Mechanics Life Prediction Models

Author : Richard P. Gangloff
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Environment Enhanced Fatigue Crack Propagation in Metals: Inputs to Fracture Mechanics Life Prediction Models by : Richard P. Gangloff

Download or read book Environment Enhanced Fatigue Crack Propagation in Metals: Inputs to Fracture Mechanics Life Prediction Models written by Richard P. Gangloff and published by . This book was released on 1993 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Comprehensive Structural Integrity

Author : Ian Milne
Publisher : Elsevier
ISBN 13 : 0080490735
Total Pages : 4647 pages
Book Rating : 4.0/5 (84 download)

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Book Synopsis Comprehensive Structural Integrity by : Ian Milne

Download or read book Comprehensive Structural Integrity written by Ian Milne and published by Elsevier. This book was released on 2003-07-25 with total page 4647 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Nano and Microstructural Design of Advanced Materials

Author : M. A. Meyers
Publisher : Elsevier
ISBN 13 : 0080537235
Total Pages : 317 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Nano and Microstructural Design of Advanced Materials by : M. A. Meyers

Download or read book Nano and Microstructural Design of Advanced Materials written by M. A. Meyers and published by Elsevier. This book was released on 2003-12-05 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance of the nanoscale effects has been recognized in materials research for over fifty years, but it is only recently that advanced characterization and fabrication methods are enabling scientists to build structures atom-by-atom or molecule-by molecule. The understanding and control of the nanostructure has been, to a large extent, made possible by new atomistic analysis and characterization methods pioneered by transmission electron microscopy. Nano and Microstructural Design of Advanced Materials focuses on the effective use of such advanced analysis and characterization techniques in the design of materials. Teaches effective use of advanced analysis and characterization methods at an atomistic level Contains many supporting examples of materials in which such design concepts have been successfully applied

LaQue's Handbook of Marine Corrosion

Author : David A. Shifler
Publisher : John Wiley & Sons
ISBN 13 : 1119788838
Total Pages : 756 pages
Book Rating : 4.1/5 (197 download)

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Book Synopsis LaQue's Handbook of Marine Corrosion by : David A. Shifler

Download or read book LaQue's Handbook of Marine Corrosion written by David A. Shifler and published by John Wiley & Sons. This book was released on 2022-07-13 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: The new edition of LaQue's classic text on marine corrosion, providing fully updated control engineering practices and applications Extensively updated throughout, the second edition of La Que's Handbook of Marine Corrosion remains the standard single-source reference on the unique nature of seawater as a corrosive environment. Designed to help readers reduce operational and life cycle costs for materials in marine environments, this authoritative resource provides clear guidance on design, materials selection, and implementation of corrosion control engineering practices for materials in atmospheric, immersion, or wetted marine environments. Completely rewritten for the 21st century, this new edition reflects current environmental regulations, best practices, materials, and processes, with special emphasis placed on the engineering, behavior, and practical applications of materials. Divided into three parts, the book first explains the fundamentals of corrosion in marine environments, including atmospheric corrosion, erosion, microbiological corrosion, fatigue, environmental cracking, and cathodic delamination. The second part discusses corrosion control methods and materials selection that can mitigate or eliminate corrosion in different marine environments. The third section provides the reader with specific applications of corrosion engineering to structures, systems, or components that exist in marine environments. This much-needed new edition: Presents a comprehensive and up-to-date account of the science and engineering aspects of marine corrosion Focuses on engineering aspects, descriptive behavior, and practical applications of materials usage in marine environments Addresses the various materials used in marine environments, including metals, polymers, alloys, coatings, and composites Incorporates current regulations, standards, and recommended practices of numerous organizations such as ASTM International, the US Navy, the American Bureau of Shipping, the International Organization for Standardization, and the International Maritime Organization Written in a clear and understandable style, La Que's Handbook of Marine Corrosion, Second Edition is an indispensable resource for engineers and materials scientists in disciplines spanning the naval, maritime, commercial, shipping industries, particularly corrosion engineers, ship designers, naval architects, marine engineers, oceanographers, and other professionals involved with products that operate in marine environments.

Virtual Testing and Predictive Modeling

Author : Bahram Farahmand
Publisher : Springer Science & Business Media
ISBN 13 : 0387959246
Total Pages : 420 pages
Book Rating : 4.3/5 (879 download)

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Book Synopsis Virtual Testing and Predictive Modeling by : Bahram Farahmand

Download or read book Virtual Testing and Predictive Modeling written by Bahram Farahmand and published by Springer Science & Business Media. This book was released on 2009-06-29 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thematerialsusedinmanufacturingtheaerospace,aircraft,automobile,andnuclear parts have inherent aws that may grow under uctuating load environments during the operational phase of the structural hardware. The design philosophy, material selection, analysis approach, testing, quality control, inspection, and manufacturing are key elements that can contribute to failure prevention and assure a trouble-free structure. To have a robust structure, it must be designed to withstand the envir- mental load throughout its service life, even when the structure has pre-existing aws or when a part of the structure has already failed. If the design philosophy of the structure is based on the fail-safe requirements, or multiple load path design, partial failure of a structural component due to crack propagation is localized and safely contained or arrested. For that reason, proper inspection technique must be scheduled for reusable parts to detect the amount and rate of crack growth, and the possible need for repairing or replacement of the part. An example of a fail-sa- designed structure with crack-arrest feature, common to all aircraft structural parts, is the skin-stiffened design con guration. However, in other cases, the design p- losophy has safe-life or single load path feature, where analysts must demonstrate that parts have adequate life during their service operation and the possibility of catastrophic failure is remote. For example, all pressurized vessels that have single load path feature are classi ed as high-risk parts. During their service operation, these tanks may develop cracks, which will grow gradually in a stable manner.