Critical Issues in Hydrogen Assisted Cracking of Structural Alloys PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 25
Book Description
Both internal and hydrogen environment assisted cracking continue to seriously limit high performance structural alloys and confound quantitative component prognosis. While intergranular H cracking assisted by impurity segregation can be minimized, other mechanisms promote IG cracking and transgranular H cracking modes have emerged; new alloys suffer serious H cracking similar to old materials. Micromechanical models of crack tip H localization and damage by decohesion predict important trends in threshold and subcritical crack growth rate behaviour. H diffusion appears to limit rates of cracking for monotonic and cyclic loading; however, uncertain%adjustable parameters hinder model effectiveness. It is necessary to better define conditions within 0.1-5 micronmeter of the crack tip, where dislocations and microstructure dominate continuum mechanics, and chemistry is localized. Nano-mechanics modeling and experimental results show very high levels of H accumulated in the crack tip fracture process zone, as necessary for interface decohesion. Contributing mechanisms include high crack tip stresses due to dislocation processes such as strain gradient plasticity, as well as powerful H production and trapping proximate to the electrochemically reacting crack tip surface. New sub- micrometer resolution probes of crack tip damage will better define features such as crack path crystallography (EBSD + Stereology) and surface morphology (high brightness, dual detector SEM), local H concentration (%IDS and NRA), and validate crack tip mechanics modelling (micro-Laue x-ray diffraction and EBSD).
Author: Publisher: ISBN: Category : Languages : en Pages : 25
Book Description
Both internal and hydrogen environment assisted cracking continue to seriously limit high performance structural alloys and confound quantitative component prognosis. While intergranular H cracking assisted by impurity segregation can be minimized, other mechanisms promote IG cracking and transgranular H cracking modes have emerged; new alloys suffer serious H cracking similar to old materials. Micromechanical models of crack tip H localization and damage by decohesion predict important trends in threshold and subcritical crack growth rate behaviour. H diffusion appears to limit rates of cracking for monotonic and cyclic loading; however, uncertain%adjustable parameters hinder model effectiveness. It is necessary to better define conditions within 0.1-5 micronmeter of the crack tip, where dislocations and microstructure dominate continuum mechanics, and chemistry is localized. Nano-mechanics modeling and experimental results show very high levels of H accumulated in the crack tip fracture process zone, as necessary for interface decohesion. Contributing mechanisms include high crack tip stresses due to dislocation processes such as strain gradient plasticity, as well as powerful H production and trapping proximate to the electrochemically reacting crack tip surface. New sub- micrometer resolution probes of crack tip damage will better define features such as crack path crystallography (EBSD + Stereology) and surface morphology (high brightness, dual detector SEM), local H concentration (%IDS and NRA), and validate crack tip mechanics modelling (micro-Laue x-ray diffraction and EBSD).
Author: Vladimir A. Polyanskiy Publisher: Springer Nature ISBN: 3030669483 Category : Technology & Engineering Languages : en Pages : 213
Book Description
The book presents a collection of chapters on the current problems associated with hydrogen damage. It discusses the effect of hydrogen on material properties and its interaction with the material microstructure, physical features of hydrogen transport in metals and alloys, as well as applicable methods of measuring concentration of hydrogen in solid media.
Author: Publisher: ISBN: Category : Languages : en Pages : 47
Book Description
Project goals in this study focused on localized corrosion and hydrogen embrittlement. The former emphasized grain boundary and crevice corrosion. Research on the latter has improved understanding of the intrusion of hydrogen into metals and an improved capability of preventing hydrogen assisted cracking of structural members. Results have been obtained on hydrogen absorption from the gas phase using the scanning tunneling microscope (STM). These results, which characterize the absorption process at an atomic scale, provide the capability of STM for studying the H-material interaction. Another important advance is the development of a theoretical basis for hydrogen entry into a metal during cathodic charging from aqueous solution. Models enable previously unavailable parameters to be determined from steady state hydrogen permeation. As a result, application of the model can provide new diagnostic criteria for determining the role of various system parameters in modifying the rate of hydrogen entry.
Author: Raouf A. Ibrahim Publisher: John Wiley & Sons ISBN: 1119135494 Category : Technology & Engineering Languages : en Pages : 1016
Book Description
This important, self-contained reference deals with structural life assessment (SLA) and structural health monitoring (SHM) in a combined form. SLA periodically evaluates the state and condition of a structural system and provides recommendations for possible maintenance actions or the end of structural service life. It is a diversified field and relies on the theories of fracture mechanics, fatigue damage process, and reliability theory. For common structures, their life assessment is not only governed by the theory of fracture mechanics and fatigue damage process, but by other factors such as corrosion, grounding, and sudden collision. On the other hand, SHM deals with the detection, prediction, and location of crack development online. Both SLA and SHM are combined in a unified and coherent treatment.
Author: Mahmoud Y. Demeri Publisher: ASM International ISBN: 1627080058 Category : Business & Economics Languages : en Pages : 312
Book Description
Examines the types, microstructures and attributes of AHSSAlso reviews the current and future applications, the benefits, trends and environmental and sustainability issues.
Author: Agnieszka Jędrzejewska Publisher: Springer Nature ISBN: 3031332113 Category : Technology & Engineering Languages : en Pages : 1363
Book Description
This book highlights the latest advances, innovations, and applications in cement-based materials (CBM) and concrete structures, as presented by leading international researchers and engineers at the International RILEM Conference on synergizing expertise toward sustainability and robustness of CBM and concrete structures (SynerCrete), held in Milos Island, Greece, on June 14-16, 2023. The aim of the conference was to discuss and arouse progress in research, development, and application of CBM and structural concrete through combination of expertise from distinct fields of knowledge, such as performance-based design, 3D modeling for analysis/design, building information modeling, and even robotics, while keeping focus on multiscale approaches at time and spatial levels. It covers a diverse range of topics concerning alternative concrete formulations for adaptation to climate change, performance-based and multiphysics/multiscale design and innovative testing, structural health monitoring and maintenance management, integral BIM-based planning, and resource-responsible building. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster new multidisciplinary collaborations. The two volumes encompass more than 200 original contributions in the field.
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Author: Vladimir A. Polyanskiy
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Author: Alexander Robert Troiano
Author: Raouf A. Ibrahim
Author: Mahmoud Y. Demeri
Author: Agnieszka Jędrzejewska
Author: Grosvenor Cook Story (III.)