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Fatigue Damage

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ISBN: 9783038426240 9783038426257 Year: Pages: VI, 204 DOI: 10.3390/books978-3-03842-625-7 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: General and Civil Engineering
Added to DOAB on : 2017-12-22 11:24:46
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There is an increasing acknowledgement in the engineering community that the response to this challenge, that is, prevention of catastrophic failure, generally requires a systems approach and necessitates engagement of a large pool of multidisciplinary expertise and the deployment of tools for systems analysis. This multidisciplinary pool includes materials science, structural analysis, manufacturing technologies, quality control and evaluation, mathematics, physics, and probability and reliability. Furthermore, from the scientific point of view, there is also an increasing acknowledgement that addressing the complex engineering problems of today requires the use of concepts and approaches that can account for size and time scaling effects. The Special Issue scope embraces interdisciplinary work aimed at understanding and deploying physics of fatigue and failure techniques, advancing experimental and theoretical failure analysis, modelling of the structural response with respect to both local and global failures, and structural design that accounts for scale and time effects in preventing engineering failures.

Keywords

Fatigue --- Design --- Crack growth --- Fracture

New contributions to R-curves and bridging stresses - Applications of weight functions

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Book Series: Schriftenreihe des Instituts für Angewandte Materialien, Karlsruher Institut für Technologie ISSN: 21929963 ISBN: 9783866448360 Year: Volume: 3 Pages: VII, 231 p. DOI: 10.5445/KSP/1000027303 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:02
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Most ceramics show an increase of the crack growth resistance during crack propagation (R-curve behaviour). Reasons for such behaviour are bridging effects between opposite crack surfaces, phase transformations around the tip of a crack, and development of micro-cracking zones. This booklet predominantly deals with the bridging behaviour and the discussion of the observed effects in terms of the fracture mechanics weight function procedure.

Advanced Approaches Applied to Materials Development and Design Predictions

Authors: --- --- --- --- et al.
ISBN: 9783039284122 9783039284139 Year: Pages: 164 DOI: 10.3390/books978-3-03928-413-9 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: General and Civil Engineering --- Technology (General)
Added to DOAB on : 2020-04-07 23:07:09
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This thematic issue on advanced simulation tools applied to materials development and design predictions gathers selected extended papers related to power generation systems, presented at the XIX International Colloquium on Mechanical Fatigue of Metals (ICMFM XIX), organized at University of Porto, Portugal, in 2018. In this issue, the limits of the current generation of materials are explored, which are continuously being reached according to the frontier of hostile environments, whether in the aerospace, nuclear, or petrochemistry industry, or in the design of gas turbines where efficiency of energy production and transformation demands increased temperatures and pressures. Thus, advanced methods and applications for theoretical, numerical, and experimental contributions that address these issues on failure mechanism modeling and simulation of materials are covered. As the Guest Editors, we would like to thank all the authors who submitted papers to this Special Issue. All the papers published were peer-reviewed by experts in the field whose comments helped to improve the quality of the edition. We also would like to thank the Editorial Board of Materials for their assistance in managing this Special Issue.

Smart Sensors for Structural Health Monitoring

Authors: --- ---
ISBN: 9783039217588 9783039217595 Year: Pages: 342 DOI: 10.3390/books978-3-03921-759-5 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-12-09 11:49:16
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Smart sensors are technologies designed to facilitate the monitoring operations. For instance, power consumption can be minimized through on-board processing and smart interrogation algorithms, and state detection enhanced through collaboration between sensor nodes. Applied to structural health monitoring, smart sensors are key enablers of sparse and dense sensor networks capable of monitoring full-scale structures and components. They are also critical in empowering operators with decision making capabilities. The objective of this Special Issue is to generate discussions on the latest advances in research on smart sensing technologies for structural health monitoring applications, with a focus on decision-enabling systems. This Special Issue covers a wide range of related topics such as innovative sensors and sensing technologies for crack, displacement, and sudden event monitoring, sensor optimization, and novel sensor data processing algorithms for damage and defect detection, operational modal analysis, and system identification of a wide variety of structures (bridges, transmission line towers, high-speed trains, masonry light houses, etc.).

Keywords

optical crack growth sensor --- digital sampling moiré --- 2D crack growth --- calibration --- concrete crack --- feature extraction --- mapping construction --- fuzzy classification --- rotary ultrasonic array --- bending stiffness --- damage identification --- environmental noise --- bridge --- test vehicle --- structural impact monitoring --- sensors distribution optimization --- NSGA-II --- energy analysis of wavelet band --- principal component analysis --- transmission tower --- settlement --- wind force --- acceleration --- modal frequencies --- sudden event monitoring --- wireless smart sensors --- demand-based nodes --- event-triggered sensing --- data fusion --- patch antenna --- sensor --- structural health monitoring --- crack identification --- resonant frequency --- damage identification --- sensor optimization --- Virtual Distortion Method (VDM) --- Particle Swarm Optimization (PSO) algorithm --- sensitivity --- structural health monitoring --- piezoelectric wafer active sensors --- active sensing --- passive sensing --- damage detection --- acoustic emission --- uniaxial stress measurement --- structural steel members --- amplitude spectrum --- phase spectrum --- shear-wave birefringence --- acoustoelastic effect --- damage detection --- smartphones --- steel frame --- shaking table tests --- wavelet packet decomposition --- low-velocity impacts --- strain wave --- impactor stiffness --- data processing --- feature selection --- impact identification --- crack --- strain --- distributed dense sensor network --- structural health monitoring --- fibre bundle --- reflective optical sensor --- tip clearance --- turbine --- aero engine --- principal component analysis --- space window --- time window --- damage detection --- length effect --- stress detection --- electromagnetic oscillation --- steel strand --- concrete structures --- SHM --- stretching method --- model updating --- displacement sensor --- helical antenna --- resonant frequency --- perturbation theory --- normal mode --- wheel minor defect --- high-speed train --- online wayside detection --- Bayesian blind source separation --- FBG sensor array

Fracture, Fatigue and Structural Integrity of Metallic Materials

Authors: ---
ISBN: 9783039288595 / 9783039288601 Year: Pages: 170 DOI: 10.3390/books978-3-03928-860-1 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-06-09 16:38:57
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Fracture, fatigue, and other subcritical processes, such as creep crack growth or stress corrosion cracking, present numerous open issues from both scientific and industrial points of view. These phenomena are of special interest in industrial and civil metallic structures, such as pipes, vessels, machinery, aircrafts, ship hulls, and bridges, given that their failure may imply catastrophic consequences for human life, the natural environment, and/or the economy. Moreover, an adequate management of their operational life, defining suitable inspection periods, repairs, or replacements, requires their safety or unsafety conditions to be defined. The analysis of these technological challenges requires accurate comprehensive assessment tools based on solid theoretical foundations as well as structural integrity assessment standards or procedures incorporating such tools into industrial practice.

Metal Plasticity and Fatigue at High Temperature

Authors: --- ---
ISBN: 9783039287703 / 9783039287710 Year: Pages: 220 DOI: 10.3390/books978-3-03928-771-0 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-06-09 16:38:57
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In several industrial fields (such as automotive, steelmaking, aerospace, and fire protection systems) metals need to withstand a combination of cyclic loadings and high temperatures. In this condition, they usually exhibit an amount—more or less pronounced—of plastic deformation, often accompanied by creep or stress-relaxation phenomena. Plastic deformation under the action of cyclic loadings may cause fatigue cracks to appear, eventually leading to failures after a few cycles. In estimating the material strength under such loading conditions, the high-temperature material behavior needs to be considered against cyclic loading and creep, the experimental strength to isothermal/non-isothermal cyclic loadings and, not least of all, the choice and experimental calibration of numerical material models and the selection of the most comprehensive design approach. This book is a series of recent scientific contributions addressing several topics in the field of experimental characterization and physical-based modeling of material behavior and design methods against high-temperature loadings, with emphasis on the correlation between microstructure and strength. Several material types are considered, from stainless steel, aluminum alloys, Ni-based superalloys, spheroidal graphite iron, and copper alloys. The quality of scientific contributions in this book can assist scholars and scientists with their research in the field of metal plasticity, creep, and low-cycle fatigue.

Civil and Military Airworthiness: Recent Developments and Challenges

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ISBN: 9783039289158 / 9783039289165 Year: Pages: 272 DOI: 10.3390/books978-3-03928-916-5 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-06-09 16:38:57
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Airworthiness, as a field, encompasses the technical and non-technical activities required to design, certify, produce, maintain, and safely operate an aircraft throughout its lifespan. The evolving technology, science, and engineering methods and, most importantly, aviation regulation, offer new opportunities and create, new challenges for the aviation industry. This book assembles review and research articles across a variety of topics in the field of airworthiness: aircraft maintenance, safety management, human factors, cost analysis, structures, risk assessment, unmanned aerial vehicles and regulations. This selection of papers informs the industry practitioners and researchers on important issues.

Computational Methods for Fracture

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ISBN: 9783039216864 9783039216871 Year: Pages: 404 DOI: 10.3390/books978-3-03921-687-1 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Computer Science
Added to DOAB on : 2019-12-09 11:49:16
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This book offers a collection of 17 scientific papers about the computational modeling of fracture. Some of the manuscripts propose new computational methods and/or how to improve existing cutting edge methods for fracture. These contributions can be classified into two categories: 1. Methods which treat the crack as strong discontinuity such as peridynamics, scaled boundary elements or specific versions of the smoothed finite element methods applied to fracture and 2. Continuous approaches to fracture based on, for instance, phase field models or continuum damage mechanics. On the other hand, the book also offers a wide range of applications where state-of-the-art techniques are employed to solve challenging engineering problems such as fractures in rock, glass, concrete. Also, larger systems such as fracture in subway stations due to fire, arch dams, or concrete decks are studied.

Keywords

plate --- FSDT --- HSDT --- Mindlin --- incompatible approximation --- fracture --- screened-Poisson model --- gradient-enhanced model --- damage-plasticity model --- implicit gradient-enhancement --- rock --- shear failure --- elastoplastic behavior --- extended scaled boundary finite element method (X-SBFEM) --- stress intensity factors --- fracture process zone (FPZ) --- thermomechanical analysis --- moderate fire --- finite element simulations --- metallic glass matrix composite --- finite element analysis --- shear band --- microstructure --- ductility --- peridynamics --- fatigue --- rolling contact --- damage --- rail squats --- cracks --- steel reinforced concrete frame --- reinforced concrete core tube --- progressive collapse analysis --- loss of key components --- self-healing --- damage-healing mechanics --- super healing --- anisotropic --- brittle material --- Brittle Fracture --- cell-based smoothed-finite element method (CS-FEM) --- Phase-field model --- ABAQUS UEL --- the Xulong arch dam --- yielding region --- cracking risk --- overall stability --- dam stress zones --- concrete creep --- prestressing stress --- compressive stress --- FE analysis --- force transfer --- grouting --- fracture network modeling --- numerical simulation --- fluid–structure interaction --- bulk damage --- brittle fracture --- rock fracture --- random fracture --- Mohr-Coulomb --- Discontinuous Galerkin --- EPB shield machine --- conditioned sandy pebble --- particle element model --- parameters calibration --- geometric phase --- photonic orbital angular momentum --- topological insulator --- topological photonic crystal --- fatigue crack growth --- surface crack --- crack shape change --- three-parameter model --- LEFM --- XFEM/GFEM --- SBFEM --- phase field --- n/a

Dissimilar Metal Welding

Authors: ---
ISBN: 9783039219544 9783039219551 Year: Pages: 288 DOI: 10.3390/books978-3-03921-955-1 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-01-07 09:08:26
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The combination of distinct materials is a key issue in modern industry, whereas the driving concept is to design parts with the right material in the right place. In this framework, a great deal of attention is directed towards dissimilar welding and joining technologies. In the automotive sector, for instance, the concept of “tailored blanks”, introduced in the last decade, has further highlighted the necessity to weld dissimilar materials. As far as the aeronautic field is concerned, most structures are built combining very different materials and alloys, in order to match lightweight and structural performance requirements. In this framework, the application of fusion welding techniques, namely, tungsten inert gas or laser welding, is quite challenging due to the difference in physical properties, in particular the melting point, between adjoining materials. On the other hand, solid-state welding methods, such as the friction stir welding as well as linear friction welding processes, have already proved to be capable of manufacturing sound Al-Cu, Al-Ti, Al-SS, and Al-Mg joints, to cite but a few. Recently, promising results have also been obtained using hybrid methods. Considering the novelty of the topic, many relevant issues are still open, and many research groups are continuously publishing valuable results. The aim of this book is to finalize the latest contributions on this topic.

Keywords

dissimilar joints --- friction stir welding --- microstructure --- mechanical properties --- local strength mismatch --- dissimilar metal welded joint --- fracture resistance --- crack growth path --- optimal design --- laser beam welding --- spatial beam oscillation --- dissimilar metals --- aluminum --- copper --- friction stir welding --- aluminum --- copper --- cross-section adjustment --- mechanical properties --- electrical properties --- dissimilar weld --- ageing --- tensile properties --- hardness --- failure mode --- dissimilar metal welding --- Inconel 625 --- AISI 316L --- microstructure --- filler metals --- friction stir spot welding --- friction stir spot brazing --- joining area --- fracture load --- Al/steel dissimilar materials --- friction stir welding --- interface --- intermetallic compounds --- dual-beam laser welding --- steel/Al joint --- side-by-side configuration --- tensile resistance --- EBSD phase mapping --- pulsed Nd:YAG laser beam welding --- interfacial crack initiation --- dissimilar Ti6Al4V/AA6060 lap joint --- phase potential --- laser welding --- pulsed Nd:YAG laser --- DP1000 steel --- 1050 aluminum alloy --- dissimilar materials welding --- steel/aluminum joint --- Ag-Cu-Zn --- Rare earth --- aging treatment --- microstructure --- mechanical properties --- aluminum --- dissimilar --- friction stir welding --- FSW --- hardness --- microstructure --- tensile --- magnetic pulse welding --- dissimilar metal welding --- solid state welding --- welding window --- cloud of particles --- jet --- surface activation --- welding-brazing --- arc assisted laser method --- aluminum-steel butt joint --- mechanical properties --- DeltaSpot welding --- spooling process tape --- aluminum alloy --- dissimilar metal welding --- lobe curve --- electromagnetic pulse welding --- tubular joints --- internal supports --- n/a

Failure Mechanisms in Alloys

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ISBN: 9783039282760 9783039282777 Year: Pages: 476 DOI: 10.3390/books978-3-03928-277-7 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-04-07 23:07:09
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The era of lean production and excellence in manufacturing, advancing with sustainable development, demands the rational utilization of raw materials and energy resources, adopting cleaner and environmentally-friendly industrial processes. In view of the new industrial revolution, through digital transformation, the exploitation of smart and sophisticated materials systems, the need of minimizing scrap and increasing efficiency, reliability and lifetime and, on the other hand, the pursuit of fuel economy and limitation of carbon footprint, are necessary conditions for the imminent growth in a highly competitive economy. Failure analysis is an interdisciplinary scientific topic, reflecting the opinions and interpretations coming from a systematic evidence-gathering procedure, embracing various important sectors, imparting knowledge, and substantiating improvement practices. The deep understanding of material/component role (e.g., rotating shaft, extrusion die, gas pipeline) and properties will be of central importance for fitness for purpose in certain industrial processes and applications. Finally, it is hoped and strongly believed that the accumulation of additional knowledge in the field of failure mechanisms and the adoption of the principles, philosophy, and deep understanding of failure analysis process approach will strongly promote the learning concept, as a continuously evolving process leading to personal and social progress and prosperity.

Keywords

impingement --- erosion corrosion --- API 5L-X65 --- flow loop --- wear scar --- creep fatigue --- crack growth --- grain boundary --- hydrogen-assisted cracking --- corrosion --- SOHIC --- cleavage fracture --- cold-working process --- surface-cracking process --- impact toughness --- strength --- low temperatures --- austenitic stainless steels --- pipeline steel --- tensile stress --- corrosion --- potentiodynamic polarization --- EIS --- brass extrusion --- CFD simulation --- extrusion failures --- plastic deformation processing --- finite element analysis --- inverse modeling --- post-necking hardening --- biaxial tensile test --- elevated temperature --- reliability design --- helix upper dispenser --- fracture --- parametric accelerated life testing --- faulty designs --- metal components --- fracture mechanisms --- fractography --- fracture mechanics --- quality improvement --- finite element modeling --- nanocrystalline materials --- elastic moduli --- yield strength --- cast duplex stainless steels --- thermal aging --- tensile deformation --- spinodal decomposition --- smooth particle hydrodynamics --- Titanium alloy machining --- numerical simulation --- cutting forces --- chip formation --- fracture --- iterative FEM Method --- GISSMO Model --- softening --- macroscopic strength criterion --- isotropic metals --- fracture plane --- linear Mohr–Coulomb criterion --- failure mechanism --- W-30Cu --- microstructure homogeneity --- dynamic compression strength --- ductility --- failure mechanism --- slow-rate machining --- chip formation --- shape --- temperature --- microhardness HV --- creep --- steam reforming --- carbides --- G-phase --- aging --- cast reformer tubes --- hot stamping --- press hardening --- austenitizing furnace --- high temperature fatigue --- thermal distortion --- conveying system --- refractory steels --- furnace component failure --- ductile irons --- tensile tests --- mechanical properties --- constitutive equations --- quality assessment --- shear angle --- chip root --- shape --- built-up edge --- slow-rate machining --- convection tubes --- AISI 304 stainless steel --- failure analysis --- sensitization --- bake hardening --- dent resistance --- failure study --- polynomial regression --- yield strength --- automotive steels --- reformer tubes --- HP-Mod --- failure analysis --- creep --- surface modification techniques --- degradation of protective layers --- lubrication --- nitrocarburizing --- hardfacings --- thermal-sprayed coatings --- finite element analysis --- forward slip prediction --- strip marking method --- multilinear regression --- micro flexible rolling --- thickness transition area --- 3D Voronoi modelling --- automotive --- 6063 Alloy --- EBSD --- bendability --- fractography --- modeling --- texture --- tribological properties --- wear --- surface treatment --- self-equalizing bearing --- n/a

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