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Relevant bibliographies by topics / Defects propagation

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Academic literature on the topic 'Defects propagation'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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Journal articles on the topic "Defects propagation"

1

Salim, M. N., M. N. M. Khairy, and T. Hayashi. "Effect of Oval Defect on Propagation of Fundamental Lamb Wave." Applied Mechanics and Materials 833 (April 2016): 49–58. http://dx.doi.org/10.4028/www.scientific.net/amm.833.49.

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Complicated Lamb wave propagation in structures can cause a misinterpretation in defect location and sizing during nondestructive inspections. A visualization of Lamb wave interactions with oval defects was carried out in our study to investigate the phenomenon of fundamental Lamb wave interaction around defect by using a reduced model of plate in ABAQUS. The visualized wave propagations with oval shape of through defects in plates demonstrated different patterns of wave interactions for the symmetric and anti-symmetric modes. The results also visualized the mode conversions around defects whi

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Wang, Shang, Wei Qiang Wang, Ming Da Song, and Hao Zhang. "The Fatigue and Fracture Analysis of Steam Turbine Rotor Shafts Containing Defects." Key Engineering Materials 795 (March 2019): 254–61. http://dx.doi.org/10.4028/www.scientific.net/kem.795.254.

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In this study, the assessment and calculation methods for the crack propagation life of steam turbine rotor shafts containing defects are presented. The analytic methods for estimating the average stress and the alternating stress amplitude of the steam turbine rotor shafts are introduced. The defects on/in the rotor shafts were regularized by the method of fracture mechanics, and the high cycle fatigue crack propagation life and low cycle fatigue crack propagation life of the rotor shafts are estimated from Paris formula. Taking the 60MW turbine rotor shafts containing an initial surface defe

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Huang, Yunqing, and Jichun Li. "Total Reflection and Cloaking by Triangular Defects Embedded in Zero Index Metamaterials." Advances in Applied Mathematics and Mechanics 7, no. 2 (2015): 135–44. http://dx.doi.org/10.4208/aamm.2014.m659.

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AbstractIn this work, we investigate wave propagation through a zero index meta-material (ZIM) waveguide embedded with triangular dielectric defects. We provide a theoretical guidance on how to achieve total reflection and total transmission (i.e., cloaking) by adjusting the defect sizes and/or permittivities of the defects. Our work provides a systematical way in manipulating wave propagation through ZIM in addition to the widely studied dielectric defects with cylindrical and rectangular geometries.

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Yu, Shuisheng, Leilei Niu, Jin Chen, Yawei Wang, and Honghao Yang. "Study on Bond Defect Detection in Grouted Rock Bolt Systems under Pullout Loads." Advances in Materials Science and Engineering 2022 (August 31, 2022): 1–9. http://dx.doi.org/10.1155/2022/3282211.

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In grouted rock bolt systems, bond defects often occur, which seriously affects the safety of rock mass structures. Therefore, in this study, based on the existence of bond defects, laboratory tests were conducted to detect the location and length of bond defects and study the guided wave propagation in grouted rock bolt systems under different pullout loads. The guided wave signal was analysed in the time domain and frequency domain. In addition to the laboratory test, a numerical simulation of the effect of different bond defect locations on ultrasonic guided wave propagation in rock bolts w

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Basmaci, Ayse. "The Behavior of Electromagnetic Wave Propagation in Photonic Crystals with or without a Defect." Applied Computational Electromagnetics Society 36, no. 6 (2021): 632–41. http://dx.doi.org/10.47037/2020.aces.j.360603.

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In this study, the electromagnetic wave propagation behavior of two-dimensional photonic crystal plates with a defect is investigated. For this purpose, the partial differential equation for the electromagnetic wave propagation in various photonic crystal plates containing a defect or not is obtained by using Maxwell’s equations. The defect is also defined in the electromagnetic wave propagation equation appropriately. In order to solve the electromagnetic wave propagation equation, the finite differences method is used. The material property parameters of the photonic crystal plates are deter

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Zhu, Rui, Yonghui Liu, Xingyue Nie, Qingqing Xiao, Jingpu Liang, and Dongfeng Cao. "Compressive Failure and Dual-Defect Coupling Effects of Open-Hole Composite Laminates with Drilling-Induced Delamination." Materials 18, no. 12 (2025): 2790. https://doi.org/10.3390/ma18122790.

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This study investigates the influence of drilling-induced delamination damage on the compressive mechanical behavior of open-hole carbon fiber-reinforced composite laminates and explores the failure mechanisms under dual-defect coupling effects. Specimens with circular delamination defects of varying sizes were fabricated by embedding polytetrafluoroethylene (PTFE) films during the layup process. Ultrasonic C-scan and digital image correlation (DIC) techniques were used to monitor delamination propagation and deformation behavior. A cohesive zone-based numerical model was developed and validat

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Huang, Chen, Zong-Xian Zhang, Adeyemi Aladejare, Xianbo Guan, Bingbing Yu, and Liyun Yang. "The Effect of Preloaded Compressive Stress and Curvature of Defect on Blast-Induced Fracture Behavior by Caustic and Numerical Models." Mathematics 11, no. 21 (2023): 4532. http://dx.doi.org/10.3390/math11214532.

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In this study, the effects of preloaded uniaxial compressive stress and defect (prefabricated by laser cutting) curvature on blast-induced cracks and stress wave propagation were investigated in polymethyl methacrylate (PMMA) specimens using caustics theory. Based on the mathematical relationship between stress and optics, the fracture behavior (the propagation path, dynamic stress intensity factors (DSIFs), propagation velocity, initiation angle of the main crack, and damage degree between the defect and the blasthole) was calculated and analyzed quantitatively. The results show that the prel

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Cao, Andong, Zhen Zhang, and Qian Li. "Frequency shifting of transmitted ultrasound in thick composites containing fiber wrinkles and its application in non-destructive evaluation." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A246. http://dx.doi.org/10.1121/10.0023434.

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Thick composite structures are prone to defects such as fiber wrinkles and voids during manufacturing. It is challenging to accurately evaluate the forming quality of the structures using conventional ultrasonic inspection, due to the coupling effects between time-frequency features of ultrasound and mixed-type defects. Propagation behaviors of through-thickness transmitted ultrasound in thick composites with fiber wrinkles, voids and no defects were comparatively investigated by both simulation and experiment in this study. Influence of out-of-plane fiber wrinkles on the ultrasonic frequency

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Bultel, Yann, Corine BAS, Florence Dubelley, Fabrice Micoud, Sébastien Rosini, and Christine Nayoze-Coynel. "Anode Defects’ Propagation in Polymer Electrolyte Membrane Fuel Cells Stack." ECS Meeting Abstracts MA2023-02, no. 38 (2023): 1835. http://dx.doi.org/10.1149/ma2023-02381835mtgabs.

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Reliability and durability are key considerations to successfully deploy Proton Exchange Membrane Fuel Cells (PEMFCs). Defects induced by manufacturing processes and fuel cell operating conditions may shorten the lifetime of PEMFC due to membrane electrode assembly (MEA) components degradations. If the degradation mechanisms occurring along ageing are now well-known, the propagation of these defects to other materials or to other locations in the stack was poorly investigated in the literature. Recently, we investigated a defect-propagation in MEA via accelerated stress tests combining load an

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Erofeev, V. I., A. V. Leonteva, and A. V. Shekoyan. "DISPERSION OF LONGITUDINAL WAVES PROPAGATING IN MATERIALS WITH POINT DEFECTS." PNRPU Mechanics Bulletin, no. 5 (December 6, 2023): 26–35. http://dx.doi.org/10.15593/perm.mech/2023.5.03.

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The paper investigates the propagation of harmonic waves in materials with point defects. The problem is described by a system of differential equations, which includes a dynamic equation of the theory of elasticity and kinetic equations of defect densities tak-ing into account the mutual influence of defects and a propagating wave, as well as mutu-al recombination of defects. We consider both limit cases, materials with one type of point defects (vacancies, interstitials), and the general case if the material contains both types of point defects (vacancies and interstitials). We analyzed the

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Dissertations / Theses on the topic "Defects propagation"

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Soboyejo, Winston Oluwole. "The propagation of defects under fatigue loading." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257906.

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Hussein, Salah A.-R. Ahmed. "Characterisation of planar defects in solids using ultrasonic pulse echo techniques." Thesis, City University London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389705.

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Murat, B. I. S. "Propagation and scattering of guided waves in composite plates with defects." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1469777/.

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Failure in composite structures due to low-velocity impact damage raises a significant maintenance concern because it can lead to a barely visible and difficult-to-detect damage. Depending on the severity of the impact, fiber and matrix breakage or delaminations can occur, reducing the load carrying capacity of the structure. Efficient structural health monitoring (SHM) of composite structures can be achieved by using low- frequency guided ultrasonic waves as they have advantages of propagating over large structure and being sensitive to defects located at any thickness position. This work foc

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Foteinopoulou, Stavroula. "Electromagnetic Wave Propagation in Two-Dimensional Photonic Crystals." Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2003. http://www.osti.gov/servlets/purl/822058-9BqHHS/native/.

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Thesis (Ph.D.); Submitted to Iowa State Univ., Ames, IA (US); 12 Dec 2003.<br>Published through the Information Bridge: DOE Scientific and Technical Information. "IS-T 2048" Stavroula Foteinopoulou. 12/12/2003. Report is also available in paper and microfiche from NTIS.

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Oliveira, Vanessa Amaral de. "Influence of processing parameters on the generation and propagation of electrically active crystalline defects in monolike silicon." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI021.

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Le nouveau procédé d’élaboration par solidification dirigée de lingots de Si quasi-monocristallin (« monolike ») offre une alternative séduisante à l’utilisation plus coûteuse de monocristaux pour la fabrication de cellules photovoltaïques à architecture avancée et haut rendement. Toutefois, la présence locale de zones de fortes densités de dislocations entraîne une dispersion des rendements obtenus.Cette Thèse présente une analyse détaillée des mécanismes de formation des structures de dislocations lors de la cristallisation monolike et de leur influence sur les propriétés électriques du maté

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Cini, Andrea. "Scribe marks at fuselage joints : initiation and propagation of fatigue cracks from mechanical defects in aluminium alloys." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7895.

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Mechanical damages, like scratches, are commonly detected on the surfaces of aircraft components and structures. They can be accidentally introduced during machining or maintenance operations or be the result of wear and impacts during aircraft service. Under the action of service loads, such mechanical damage can generate fatigue cracks reducing the component fatigue life and compromising the aircraft structural integrity. The evaluation of the effect of scratches and other small mechanical defects on the structure and component fatigue lives is therefore necessary to define an inspections pr

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Ehrlacher, Virginie. "Quelques modèles mathématiques en chimie quantique et propagation d'incertitudes." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST1073/document.

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Ce travail comporte deux volets. Le premier concerne l'étude de défauts locaux dans des matériaux cristallins. Le chapitre 1 donne un bref panorama des principaux modèles utilisés en chimie quantique pour le calcul de structures électroniques. Dans le chapitre 2, nous présentons un modèle variationnel exact qui permet de décrire les défauts locaux d'un cristal périodique dans le cadre de la théorie de Thomas-Fermi-von Weiszäcker. Celui-ci est justifié à l'aide d'arguments de limite thermodynamique. On montre en particulier que les défauts modélisés par cette théorie ne peuvent pas être chargés

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Verma, Ravi. "Interaction of ultrasonic waves with frictional defects in the context of nondestructive testing of materials." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILN063.

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Cette thèse porte sur les concepts théoriques, les modèles et les expériences concernant la propagation des ondes élastiques et les vibrations dans les solides contenant des contacts internes (fissures, délaminations, etc.) ayant une nature frictionnelle.Une partie essentielle du travail est liée au développement d'une méthode d'acoustique numérique capable d'imiter les ondes élastiques dans un environnement contenant des fissures/contacts de frottement. Ces défauts planaires représentent une sorte de frontière intérieure à laquelle il convient d'appliquer des conditions limites appropriées. S

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Aïssani, Amina. "Optimisation fiabiliste des performances énergétiques des bâtiments." Thesis, Clermont-Ferrand 2, 2016. http://www.theses.fr/2016CLF22677/document.

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Dans un contexte de forte compétitivité économique et de respect de l’environnement, de nombreuses actions sont entreprises chaque année dans le but d’améliorer la performance énergétique des bâtiments. En phase de conception, le recours à la simulation permet d’évaluer les différentes alternatives au regard de la performance énergétique et du confort des occupants et constitue ainsi un outil d’aide à la décision incontournable. Toutefois, il est courant d’observer des écarts entre les performances énergétiques réelles et celles prévues lors de la conception. Cette thèse porte sur l’améliorati

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Masmoudi, Mohamed. "Modélisation de la propagation d'ondes guidées, générées et détectées par transducteurs ultrasonores à couplage air : Application au CND de structures aéronautiques composites." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14483/document.

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Le contrôle non destructif par ondes guidées générées et détectées par des transducteurs ultrasonores à couplage par air, présente deux avantages majeurs. Le premier réside dans la capacité des ondes guidées à transporter l’information sur la qualité du milieu sur une grande distance. De plus, l’absence d’un milieu de couplage liquide entre les capteurs et le milieu à tester, rend le contrôle plus commode. Ce travail consiste d’abord à développer un procédé de simulation numérique qui prend en considération de nombreux paramètres du système de contrôle. Dans une optique de réduire le nombre de

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Books on the topic "Defects propagation"

1

D, Noebe R., and United States. National Aeronautics and Space Administration., eds. Low cycle fatigue behavior of polycrystalline NiAl at 300 and 1000K. National Aeronautics and Space Administration, 1993.

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D, Noebe Ronald, and United States. National Aeronautics and Space Administration., eds. Low cycle fatigue behavior of polycrystalline NiAl at 300 and 1000K. National Aeronautics and Space Administration, 1993.

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United States. National Aeronautics and Space Administration., ed. Prediction and verification of ductile crack growth from simulated defects in strength overmatched butt welds: A thesis ... National Aeronautics and Space Administration, 1997.

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O, Harris David, Thomas Jerrell M, George C. Marshall Space Flight Center., and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., eds. A review of fracture mechanics life technology. National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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Soboyejo, Winston Oluwole. The propagation of defects under fatigue loading. 1988.

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Nazer, Hisham. Power of a Third Kind. Praeger, 1999. http://dx.doi.org/10.5040/9798400699740.

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This thought-provoking book points out that the most significant change in international relations in the 20th century was not the defeat of communism, nor the end of the Cold War, but the huge advances in communications technologies. Hisham Nazer, a leading Saudi Arabian intellectual and petroleum industry leader, argues that the West has used its control over these capabilities to superimpose its cultural and political values on the rest of the world. CNN, films and television, and the Internet have become the means of promoting Western products—including soft drinks, detergents, and even th

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Book chapters on the topic "Defects propagation"

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Harris, John G. "Modeling Scanned Acoustic Imaging of Defects at Solid Interfaces." In Inverse Problems in Wave Propagation. Springer New York, 1997. http://dx.doi.org/10.1007/978-1-4612-1878-4_11.

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Chang, Zensheu, and Ajit Mal. "Wave Propagation in a Plate with Defects." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5339-7_15.

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Wei, Zheng, Jianqiang Zhou, Kexin Wang, and Xiaowen Hu. "Deep Migration Learning-Based Detection of Structural Diseases in Railway Tunnel Lining Structures." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-2417-8_11.

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AbstractIt is difficult to quickly and accurately detect defects such as voids, voids, and non compactness in the lining structure of formed railway tunnels. We have conducted in-depth research on the propagation law of ground penetrating radar electromagnetic waves in tunnel lining structures and intelligent detection methods based on deep learning. The finite difference method was applied to numerically simulate the propagation process of electromagnetic waves in tunnel lining structures with different diseases. B-scan radar images were obtained, and the characteristics of voids, voids, and

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Abdollahi, Amir, and Irene Arias. "Numerical simulation of intergranular and transgranular crack propagation in ferroelectric polycrystals." In Micromechanics of Defects in Solids. Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4626-8_2.

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Klapper, Helmut. "Generation and Propagation of Defects During Crystal Growth." In Springer Handbook of Crystal Growth. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-74761-1_4.

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Nikolakis, Nikolaos, Paolo Catti, and Kosmas Alexopoulos. "An Explainable Active Learning Approach for Enhanced Defect Detection in Manufacturing." In Lecture Notes in Mechanical Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-86489-6_5.

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Abstract Artificial Intelligence (AI) can significantly support manufacturing companies in their pursuit of operational excellence, by maintaining efficiency while minimizing defects. However, the complexity of AI solutions often creates a barrier to their practical application. Transparency and user-friendliness should be prioritized to ensure that the insights generated by AI can be effectively applied in real-time decision-making. To bridge this gap and foster a collaborative environment where AI and human expertise collectively drive operational excellence, this paper suggests an AI approa

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Weidner, Anja, Alexander Schmiedel, Mikhail Seleznev, and Horst Biermann. "Influence of Internal Defects on the Fatigue Life of Steel and Aluminum Alloys in the VHCF Range." In Multifunctional Ceramic Filter Systems for Metal Melt Filtration. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-40930-1_24.

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AbstractThis chapter concerns the influence of internal defects (i.e. nonmetallic inclusions, secondary phases and cast defects) on the fatigue lifetime of steel and aluminum alloys in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regime. The detrimental effect of internal defects depends on multiple factors such as size, morphology, chemical composition, test temperature or position in the material. Specimens were tested after active and/or reactive melt filtration processes of the materials which served to influence the amount and size distribution of internal defects. Fati

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Xu, Liu-Jun, and Ji-Ping Huang. "Theory for Thermal Edge States: Graphene-Like Convective Lattice." In Transformation Thermotics and Extended Theories. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5908-0_22.

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AbstractIn this chapter, we reveal that edge states are not necessarily limited to wave systems but can also exist in convection-diffusion systems that are essentially different from wave systems. For this purpose, we study heat transfer in a graphene-like (or honeycomb) lattice to demonstrate thermal edge states with robustness against defects and disorders. Convection is compared to electron cyclotron, which breaks space-reversal symmetry and determines the direction of thermal edge propagation. Diffusion leads to interference-like behavior between opposite convections, preventing bulk tempe

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de Vries, Linda S., and Sylke J. Steggerda. "Sinovenous Thrombosis." In Neonatal Brain Injury. Springer Nature Switzerland, 2024. https://doi.org/10.1007/978-3-031-55972-3_11.

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AbstractCerebral sinovenous thrombosis (CSVT) is not a common problem, but looking at CSVT occurring during childhood, it is most often seen during the neonatal period. Dehydration; infections, especially meningitis; and surgery for congenital heart defects are well-known risk factors. With better color Doppler ultrasound and increased use of MRI, the diagnosis is more often made. Anticoagulation therapy can be used and reduces the risk of propagation of the thrombus. Prognosis depends on associated parenchymal involvement.

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Nasedkina, A. A., A. Alexiev, and J. Malachowski. "Numerical Simulation of Ultrasonic Torsional Guided Wave Propagation for Pipes with Defects." In Springer Proceedings in Physics. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26324-3_33.

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Conference papers on the topic "Defects propagation"

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Chambers, Brian, Bostjan Bezensek, Sebastian Cravero, Pedro Olivo, and Octavio Albores. "Investigation of Sulfide Stress Crack Propagation Using Sour Pipe Burst in Tubulars with Simulated Defects under Pressure." In CONFERENCE 2024. AMPP, 2024. https://doi.org/10.5006/c2024-20420.

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Abstract Seamless oil country tubular goods (OCTG) with defined chemistry and toughness, e.g. API 5CT C110, are utilized as production casing in sour wells globally. These grades must withstand high pressures and mild sour conditions to maintain the integrity of the well and, as such, should resist both sulfide stress crack (SSC) initiation and potential propagation from defects in service. A laboratory study was conducted to assess the tendency of crack propagation from two defined types of defects, electro-discharge machined (EDM) notches and fatigue cracks, simulating potential as-delivered

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Dent (Shearer), Melinda, Arif Mubarok, and Steve Aro. "Utilizing Coating Defect Analysis to Enable Better Performance and Enhanced Lifetimes." In Coatings+ 2021. SSPC, 2021. https://doi.org/10.5006/s2021-00037.

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Abstract In order to ensure the proper lifetime and performance of a coating for mass production, minimization of defects is required. Although some defects are unavoidable, developing an understanding of root cause and propagation of common defects is key to reducing their number and ensuring the success of the coating for commercial applications. In this talk, several case studies analyzing coating defects will be discussed. We will showcase the use of advanced analytical tools to correlate defect initiation and propagation with coating performance. The methods outlined in this talk will hig

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de Bonfils-Lahovary, Marie-Laetitia, Jérôme Delfosse, Manon C. Lafouresse, Christine Blanc, and Lydia Laffont. "Characterization and Control of the Intergranular Corrosion Defects in a 2024 T351 Aluminium Alloy." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09427.

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Abstract The corrosion susceptibility of aluminium alloys, in particular the propagation kinetics of intergranular corrosion, remains not only a problem of fundamental interest but is also a key point for aircraft structures. This work aims to understand and characterize intergranular corrosion phenomena in order to develop and optimize an engineering test to determine the propagation kinetics of intergranular corrosion defects in a 2024-T351 aluminium alloy exposed to an aggressive environment with various exposure conditions (continuous immersion in a 1 M NaCl solution, exposure to a natural

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Pallaris, Alexandros, and Daniel Sjöberg. "Microwave Reconstruction of Fabrication Defects in Known Objects Using Scattering Parameter Sensitivities." In 2025 19th European Conference on Antennas and Propagation (EuCAP). IEEE, 2025. https://doi.org/10.23919/eucap63536.2025.10999660.

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Cho, Sungjun, Hyo-Won Lee, Seong-Jin Kim, et al. "A Comprehensive Analysis of 3-D Magnetic Flux Leakage for External and Internal Defects." In 2024 International Symposium on Antennas and Propagation (ISAP). IEEE, 2024. https://doi.org/10.1109/isap62502.2024.10846561.

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Mazzinghi, Agnese, Alessandro Mori, Mirko Bercigli, Mauro Bandinelli, and Angelo Freni. "Fast Computation of the EM Effect of Small Defects on Large Objects." In 2024 IEEE 1st Latin American Conference on Antennas and Propagation (LACAP). IEEE, 2024. https://doi.org/10.1109/lacap63752.2024.10876347.

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Renaud, Dylan, Daniel Assumpcao, Chang Jin, et al. "Mitigating Electron Beam Induced Defects for Low-Loss and Stable Active Photonic Circuits." In CLEO: Science and Innovations. Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_si.2024.sf3g.7.

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We report on the controlled generation and annihilation of defects in photonic platforms using low-energy electron beams. We show how these defects impact propagation losses and EO-stability in LNOI, and how they can be rectified.

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Xu, Luyao, and Y. Frank Cheng. "A Direct Assessment of Failure Pressure of High-Strength Steel Pipelines with Considerations of the Synergism of Corrosion Defects, Internal Pressure and Soil Strain." In CORROSION 2013. NACE International, 2013. https://doi.org/10.5006/c2013-02063.

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Abstract In this work, a new, finite element analysis-based model, the CX model, was developed to investigate the effect of corrosion defect, internal pressure and soil-induced strain on the local stress distribution and corrosion reaction on pipelines. The relevant calculations and analysis were also conducted on three industry models. Results demonstrated the predicted failure pressures of various grades of pipelines by the industry models are conservative when small defects are present, while overestimation of failure pressure occurs with the increase of the steel grade and the corrosion de

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Curtin, Thomas, Sharon Mellings, and Robert Adey. "Macroscale Modeling Solutions for Integrity Assessment of Corrosion-Related Damage." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00153.

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Abstract Military aircraft operating in challenging environments frequently develop corrosion damage. Nearly 80% of inspected corrosion damage sites in aircraft were found to have fatigue cracks; frequently these cracks initiated from corrosion pits. These findings reveal the importance of developing advanced predictive tools to investigate the effects of corrosion and mechanical stress on aircraft operational performance. A new computational approach to characterize the effects of corrosion related defects on fatigue life is presented. This approach includes determination of SIF solutions for

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ZIELIŃSKI, P. "PROPAGATION OF WAVES THROUGH ANHARMONIC DEFECTS." In Proceedings of the 7th International School on Theoretical Physics. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704474_0040.

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Reports on the topic "Defects propagation"

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Leis, B. N. Leis, and R. J. Eiber. PR-003-00108-R01 Fracture Control Technology for Natural Gas Pipelines Circa 2001. Pipeline Research Council International, Inc. (PRCI), 2001. http://dx.doi.org/10.55274/r0011879.

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Fracture control procedures are presented for new lines and existing lines, and illustrated with examples. Such procedures and the plans based on them address requirements to assure pipelines can tolerate large defects before leaks or ruptures occur, as well as requirements to control the length of a fracture as a secondary level of control. The report is divided into three sections. This first section defines basic terminology, describes how fracture control fits into an operator's overall assurance plan for pipeline integrity and discusses general philosophies of fracture control. The remain

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McKinley, W. G., H. T. Yura, and S. G. Hanson. Optical System Defect Propagation in ABCD Systems. Defense Technical Information Center, 1988. http://dx.doi.org/10.21236/ada200480.

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Rose, Luo, and Minachi. ZZ44154 Circumferential Guided Waves for Defect Detection in Tar Coated Pipe. Pipeline Research Council International, Inc. (PRCI), 2008. http://dx.doi.org/10.55274/r0010958.

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The study reports on circumferential guided wave inspection potential and propagation in a tar coated pipe. A computer code based on a matrix technique was developed to calculate the circumferential guided wave dispersion curves and wave structures in a viscoelastic multi-layered pipe. Experiments utilizing the SwRI Magnetostrictive ILI inspection technique were conducted under different coating conditions. There was a favorable agreement with theory. This study provides an insight into attenuation effect, ways to improve propagation distance, and a baseline for further studies on wave scatter

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Nestleroth. L52298 Augmenting MFL Tools With Sensors that Assess Coating Condition. Pipeline Research Council International, Inc. (PRCI), 2009. http://dx.doi.org/10.55274/r0010396.

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External coatings are routinely used to protect transmission pipelines from corrosion; however, coatings may degrade or disbond over time enabling corrosion to occur. Transmission pipeline operators often use magnetic flux leakage (MFL) in-line inspection tools to detect metal loss corrosion defects. Rather than finding the cause of a problem, failure of the coating within a corrosive environment, MFL corrosion surveys only find the result of the problem, corrosion defects that may permanently alter the pressure carrying capacity of the pipeline. Stress corrosion cracking (SCC) can be detected

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Arnold, Joshua. DTPH56-16-T-00004 EMAT Guided Wave Technology for Inline Inspections of Unpiggable Natural Gas Pipelines. Pipeline Research Council International, Inc. (PRCI), 2018. http://dx.doi.org/10.55274/r0012048.

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This project developed compact, lightweight, prototype Electro-Magnetic Acoustic Transducers (EMATs) and studied guided waves for defect detection, classification, and characterization in cast iron and steel pipes. Through lab testing, design, and Finite Element Analysis (FEA), guided wave propagation and defect interactions were evaluated, and the results were employed to optimize the prototype EMATs through successive design and testing iterations. The goal of developing EMATs for robotic inspection of unpiggable pipe was successfully achieved and demonstrated not only through prototype fabr

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Dawalibi. L51925 Detection of Anomalies in Coated Pipelines Using Long Range Ultrasonics. Pipeline Research Council International, Inc. (PRCI), 2002. http://dx.doi.org/10.55274/r0010644.

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Long-range guided wave pipeline inspection is claimed to be able to inspect ranges of well over 30 meters (100 Feet) in either direction (i.e. total inspection greater than 60 Meters or 200 Ft.) from a single position. In terms of inspected meters per measurement and cost per meter this technique can be a fundamental improvement from conventional methods for pipeline inspection. For inspection of hard-to-access locations it offers a good on-stream screening alternative by being able to image the pipe section from an easier-access location. Examples of inaccessible locations are road-, railway-

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Rose and Luo. L52069 Guided Wave Sizing and Discrimination for SCC Magnetostriction ILI Inspection. Pipeline Research Council International, Inc. (PRCI), 2003. http://dx.doi.org/10.55274/r0011179.

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With the goal to be able to inspect a large area of the pipe from a single sensor position, hence the development of what we call guided wave inspection. From one point on the circumference of the pipe, it is therefore proposed to inspect the entire circumferential area of the pipe. This approach leads to inspection efficiency.� Experimental techniques cannot be developed on a trial and error basis. The purpose of this work is therefore to develop a guided wave propagation model and subsequent numerical solutions to assist in the �theoretically driven� sensor design and data acquisition system

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Engel, Bernard, Yael Edan, James Simon, Hanoch Pasternak, and Shimon Edelman. Neural Networks for Quality Sorting of Agricultural Produce. United States Department of Agriculture, 1996. http://dx.doi.org/10.32747/1996.7613033.bard.

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The objectives of this project were to develop procedures and models, based on neural networks, for quality sorting of agricultural produce. Two research teams, one in Purdue University and the other in Israel, coordinated their research efforts on different aspects of each objective utilizing both melons and tomatoes as case studies. At Purdue: An expert system was developed to measure variances in human grading. Data were acquired from eight sensors: vision, two firmness sensors (destructive and nondestructive), chlorophyll from fluorescence, color sensor, electronic sniffer for odor detecti

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L51742 Serviceability of Corroded Girth Welds. Pipeline Research Council International, Inc. (PRCI), 1996. http://dx.doi.org/10.55274/r0010362.

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Prior research conducted for PRCI and others led to the development of criteria for estimating the burst strength of corroded pipe, and corollary criteria for establishing allowable defect sizes. These criteria have become widely used in the pipeline industry. That research revealed that the severity of metal-loss corrosion in the context of pressure integrity is directly affected by the length of the corroded area (as measured parallel to the pipe longitudinal axis) and the depth of the corrosion. Moreover, the length and depth affect burst strength independently, meaning a long shallow defec

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THE CRACK DETECTION METHOD OF LONGITUDINAL RIB BUTT WELD OF STEEL BRIDGE BASED ON ULTRASONIC LAMB WAVE. The Hong Kong Institute of Steel Construction, 2022. http://dx.doi.org/10.18057/icass2020.p.265.

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Ultrasonic Lamb wave is an efficient and fast new nondestructive testing technology. Due to its characteristics of wide detection range, high efficiency and strong defect identification ability, ultrasonic Lamb wave has developed rapidly in the field of nondestructive testing in recent years. Meanwhile, the longitudinal rib butt weld is one of the most important failure modes of steel bridge deck, which seriously endangers the safety and durability of long-span steel bridges. In this paper, the fatigue failure mode of longitudinal rib butt weld is considered, the propagation process of ultraso

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