Relevant bibliographies by topics / Interfacial Debonding

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Interfacial Debonding'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 June 2024

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Journal articles on the topic "Interfacial Debonding"

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Yu, Xiao Ming, Bin Zhang, Jia Min Shen, Yue Li, and Sai Sai Liu. "Simulation and Analysis on Fiber Reinforced Rubber Matrix Sealing Composite Based on Cohesive Zone Model." Materials Science Forum 953 (May 2019): 65–71. http://dx.doi.org/10.4028/www.scientific.net/msf.953.65.

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A finite element model on the single fiber pull-out test of short fiber reinforced rubber matrix sealing composites (SFRC) were established. The effects of the interphase properties on the interfacial stress distribution and initial debonding strain are investigated based on the cohesive zone model (CZM). The influences of interphase thicknesses and elastic modulus on the interfacial debonding behavior of SFRC are obtained. The results show that the interfacial initial debonding strain increases with the increasement of interphase thickness, and it decreases with the increasement of interphase elastic modulus. An interphase thickness of 0.4 μm and an interphase elastic modulus of about 750 MPa are optimal to restrain the initiation of the interfacial debonding.
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Deng, Jiang Dong, Pei Yan Huang, Xin Yan Guo, and Jun Deng. "Analysis of Interfacial Debonding of RC Beams Strengthened with CFL." Advanced Materials Research 33-37 (March 2008): 47–54. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.47.

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The interfacial bonding property between carbon fiber laminate (CFL) and concrete is a key issue in the application of RC beams strengthened with CFL. In this paper, fracture mechanics method is used to develop a calculation formula of stress intensity factor for the CFL-concrete interfacial crack. In combination with a series of tests, the interfacial fracture toughness is discussed, and the influencing factors and process of the intermediate crack-induced debonding (IC debonding) are also analyzed. The tests results show that IC debonding is generally induced by the flexural or flexural-shear cracks in the bottom of RC beams around the mid-span, and develop along the interface towards the end of the beam. A method to determine IC debonding derived from theoretic analysis and the tests results demonstrates that the interfacial failure can be effectively avoided by limiting CFL strain in the range of the debonding strain.
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Chu, Jou-Mei, Benjamin Claus, Boon Him Lim, Daniel O’Brien, Tao Sun, Kamel Fezzaa, and Wayne Chen. "Rate effects on fiber–matrix interfacial transverse debonding behavior." Journal of Composite Materials 54, no. 4 (October 4, 2019): 501–17. http://dx.doi.org/10.1177/0021998319866904.

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The rate effect of fiber–matrix interfacial debonding behavior of SC-15 epoxy with S-2 glass and aramid fiber reinforcements was studied via in-situ visualization of the transverse debonding event. In this study, the debonding force history, debonding initiation, debonding crack velocity, and crack geometry were characterized using a quasi-static load frame and a modified tension Kolsky bar at loading velocities of 0.25 mm/s and 2.5 m/s. Cruciform-shaped specimens were used for interfacial transverse debonding between SC-15 epoxy matrix and two types of fiber reinforcements. The load history and high-speed images of the debonding event were simultaneously recorded. A major increase was observed for the average peak debonding force and a minor increase was observed for the average crack velocity with increasing loading velocity. The crack geometry of the cruciform specimens under both loading velocities was also tracked. Scanning electron microscopy of the recovered specimens revealed the debonding direction along the fiber–matrix interface through angled patterns on the failure surface.
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Chen, Yan Hua, Jian Yu Chu, and Qing Jie Zhu. "Effects of Coating on Interfacial Fatigue of Fiber-Reinforced Composites." Advanced Materials Research 97-101 (March 2010): 830–33. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.830.

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Coating is one of important parts in fiber-reinforced composite. Under cyclic loading, the effect of coating on interfacial fatigue is investigated based on double shear-lag model. Stresses of components are obtained. Relationship for analyzing interfacial debonding is established by the Paris Formula. Interfacial fatigue on fiber/coating and coating/matrix is simulated. It can be seen that interfacial debonding on different interfaces meet energy conservation law in general.
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Swaminathan, Shriram, N. J. Pagano, and Somnath Ghosh. "Analysis of Interfacial Debonding in Three-Dimensional Composite Microstructures." Journal of Engineering Materials and Technology 128, no. 1 (March 18, 2005): 96–106. http://dx.doi.org/10.1115/1.1925293.

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This paper is aimed at analyzing stresses and fiber-matrix interfacial debonding in three-dimensional composite microstructures. It incorporates a 3D cohesive zone interface model based element to simulate interfacial debonding in the commercial code ABAQUS. The validated element is used to examine the potential debonding response in the presence of fiber–fiber interactions. A two-fiber model with unidirectional fibers is constructed and the effect of relative fiber spacing and volume fraction on the stress distribution in the matrix is studied. In addition, the effect of fiber orientation and spacing on the nature of initiation and propagation of interfacial debonding is studied in a two-fiber model. These results are expected to be helpful in formulating future studies treating optimal fiber orientations and payoff in controlling fiber spacing and alignment.
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Kwon, Y. W., and M. Serttunc. "Static and Dynamic Buckling of a Fiber Embedded in a Matrix With Interface Debonding." Journal of Pressure Vessel Technology 115, no. 3 (August 1, 1993): 297–301. http://dx.doi.org/10.1115/1.2929531.

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Analyses were performed for static and dynamic buckling of a continuous fiber embedded in a matrix in order to determine effects of interfacial debonding on the critical buckling load and the domain of instability. A beam on elastic foundation model was used for the study. The study showed that a local interfacial debonding between a fiber and a surrounding matrix resulted in an increase of the wavelength of the buckling mode. An increase of the wavelength yielded a decrease of the static buckling load and lowered the dynamic instability domain. In general, the effect of a partial or complete interfacial debonding on the domain of dynamic instability was more significant than its effect on the static buckling load. For dynamic buckling of a fiber, a local debonding of size 10 to 20 percent of the fiber length had the most important influence on the domains of dynamic instability regardless of the location of debonding and the boundary conditions of the fiber. For static buckling, the location of a local debonding was critical to a free, simply supported fiber, but not to a fiber with both ends simply supported.
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Heidarhaei, Meghdad, M. Shariati, and HR Eipakchi. "Effect of interfacial debonding on stress transfer in graphene reinforced polymer nanocomposites." International Journal of Damage Mechanics 27, no. 7 (August 10, 2017): 1105–27. http://dx.doi.org/10.1177/1056789517724857.

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A shear-lag analysis hybrid cohesive zone model is employed to investigate the stress transfer from polymer matrix to the graphene by considering the interfacial damage and debonding phenomena in graphene reinforced polymer nanocomposites. The applied stress can produce three cases for interface treatment: entirely intact, damaged and debonded. By using analytical derived relations, the distribution of axial stress in the graphene and interfacial shear stress at the three-mentioned states is determined and the applied stress to the nanocomposite which leads to damage and debonding initiation at the interface is evaluated. In addition, a sensitivity analysis is performed and the effects of graphene length, interfacial shear strength and graphene volume fraction on the axial stress of graphene, damage and debonding threshold stress along the interface and interfacial shear stress are studied. The results show that after applying a stress called second critical stress, the stress transfer between graphene and matrix at the bulk of graphene length (about 75% of the interface) stops due to debonding of this zone.
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Yang, Yizhan, Jiankang Chen, and Zhuping Huang. "Damage evolution in fibrous composites caused by interfacial debonding." International Journal of Damage Mechanics 29, no. 1 (June 3, 2019): 67–85. http://dx.doi.org/10.1177/1056789519854488.

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Interfacial debonding between fibers and matrix is one of the dominant damage types in fibrous composites. This paper investigates weakening effect due to the interfacial debonding. For simplification, the fibers are assumed to be rigid since the modulii and strength of fibers are much greater than those of matrix, and the distribution of the radii of fibers is assumed to obey the logarithmic normal distribution. The matrix is assumed to be a viscoelastic material. The boundary of the composite is subjected to transverse loading condition, the direction of which is perpendicular to that of fibers. The interfacial debonding between fibers and matrix is analyzed by the energy criterion, and the evolution formula of nucleated porosity due to the debonding is derived by the statistical approach. A newly defined volume average method is proposed to establish the macroscopic constitutive relation of the composites. The effect of the material parameters of matrix, as well as the size of fibers on the critical stress for the interfacial debonding and damage evolution are discussed in detail. The results obtained in this paper indicate that the macroscopic strain rate, the dispersion degree of the fiber's radii, the adhesive energy at the interface, and loading condition play key roles in the overall mechanical properties of the composites.
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Yu, Qian-Qian, and Yu-Fei Wu. "Fatigue behaviour of cracked steel beams retrofitted with carbon fibre–reinforced polymer laminates." Advances in Structural Engineering 21, no. 8 (September 18, 2017): 1148–61. http://dx.doi.org/10.1177/1369433217729518.

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In recent years, externally bonded carbon fibre–reinforced polymer has been considered an innovative way to strengthen steel structures attributed to its high strength-to-weight ratio, excellent corrosion resistance and fatigue performance. This article presents an experimental and numerical study on the fatigue behaviour of defected steel beams strengthened with carbon fibre–reinforced polymer laminates, with a special focus on the effect of interfacial debonding. Analytical modelling and numerical simulation confirmed that the interfacial debonding had a pronounced effect on carbon fibre–reinforced polymer strain and stress intensity factor at the crack front. After introducing interfacial debonding from experimental findings into the numerical analysis, the fatigue life and crack propagation versus cycle numbers of the specimens compared well with the test results. Based on the current experimental program, specimens with Sikadur 30 were more prone to debonding failure; therefore, Araldite 420 is suggested for strengthening schemes.
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Wang, Xiao Zhao, and Xin Sheng Song. "Energy-Based Debonding Model for Steel-Concrete Composite Structures." Advanced Materials Research 97-101 (March 2010): 1705–8. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1705.

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This paper present a energy-based modelling approches for interfacial debonding between steel and concrete. Steel-concrete composite structural member is considered as a generalized elastic body with both the applied load and the interfacial shear stress acting as boundary stresses, and the debonding is modeled as crack propagation along the interface. The energy relationship is discussed in the process of debonding and an energy-based criterion for steel-concrete composite structure is proposed. Following, the debonding process is analyzed through energy-based criterion. The analysis is first performed for special case with constant shear stress along debonded interface, and then for the general case with shear stress softening in the debonded zone. A direct correspondence between energy-based and strength-based analysis can be established for arbitrary softening behavior along the interface. Specifically, through the proper definition of effective interfacial shear strength, the conventional strength-based approach can be employed to give the same results as the much more complicated energy-based analysis.
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Dissertations / Theses on the topic "Interfacial Debonding"

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Mukherjee, Bikramjit. "Interfacial debonding from a sandwiched elastomer layer." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/71464.

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The problem of a thin elastomeric layer confined between two stiff adherends arises in numerous applications such as microelectronics, bio-inspired adhesion and the manufacture of soft biomedical products. A common requirement is that the debonding of the elastomeric layer from the adherends be controlled to avoid undesirable failure modes. This level of control may necessitate understanding the collective role of the interfacial adhesion, material properties, part geometries, and loading conditions on the debonding. Analytical and numerical approaches using the finite element method and a cohesive zone model (CZM) for the interfacial debonding are used in this dissertation to delineate the role of the afore-mentioned parameters on the initiation and propagation of debonding for both rigid and non-rigid adherends. Extensively studied in the dissertation is the debonding of a semi-infinite relatively stiffer adherend from an elastomer layer with its other surface firmly bonded to a rigid base. The adherend is pulled upwards by applying normal displacements either on its entire unbonded surface or on the edge of its part overhanging from the elastomer layer. The adherend and the elastomeric layer materials are assumed to be linear elastic, homogeneous and isotropic and the elastomer is assumed to be incompressible. Viscoelasticity of the elastomer is considered in the first part of the work. Plane strain deformations of the system with a bilinear traction-separation (TS) relation in the CZM are analyzed. Two non-dimensional numbers, one related to the layer confinement and the other to the interfacial TS parameters, are found to determine if debonding initiates at interior points in addition to at corner points on the adherend/elastomer interface, and if adhesion-induced instability is exhibited. This work is extended to axisymmetric problems in which debonding can take place at both interfaces. Motivated by an industrial demolding problem, numerical experiments are conducted to derive insights into preferential debonding at one of the two interfaces, including for curved adherends. Results reported herein should help engineers design an elastomer layer sandwiched between two adherends for achieving desired failure characteristics.
Ph. D.
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Joffe, Roberts. "Matrix cracking and interfacial debonding in polymer composites." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26359.

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Narayanamurthy, Vijayabaskar. "Interfacial stresses and debonding failures in plated beams." Thesis, Heriot-Watt University, 2011. http://hdl.handle.net/10399/2429.

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Extensive research and recent developments in structural engineering has shown that adhesive bonding of fibre-reinforced polymer (FRP) composite, steel or any other metallic plate to the tension face of a reinforced concrete (RC), metallic or timber beam can effectively enhance its strength and other aspects of structural performance. This technique is now popularly adopted for retro-fitment and rehabilitation of existing structures. These plated beams often fail prematurely well before attaining the full flexural capacity by either plate end debonding (PED) or intermediate crack-induced interfacial debonding (ICD) failure. Concentration of higher interfacial shear and normal stresses at the plate end due to a geometric discontinuity is believed to be responsible for PED that initiates at the plate end and propagates inwards. PED includes concrete cover separation and interfacial debonding initiated at the plate end; and such failure initiated at a critical diagonal crack. ICD initiates at an intermediate major flexural or flexural-shear crack in the soffit of the original beam due to high bond stress and propagates towards one of the plate ends (type-1) or an adjacent crack (type-2). This thesis presents a study of interfacial stresses and debonding failures in plated beams. It first presents a simple and novel theoretical solution of interfacial stresses applicable to any loading considering major deformations like axial and flexural deformations in the beam and plate within linear elastic range. This solution is then enhanced with the inclusion of the effect of adherends’ shear deformation by approximating the displacement field for interfacial shear stress and using Timoshenko’s beam theory for interfacial normal stress, achieving a better understanding of the effect of shear deformation which is ill-understood. This resulted in a first ever solution to include the effect of adherends’ shear deformation under both interfacial shear and normal stresses. This solution is further advanced by developing a rigorous and a versatile closed-form solution fully based on Timoshenko’s beam theory that offered a significant insight. Interfacial stresses at the plate end cannot be measured directly using available measurement techniques, and may only be interpreted indirectly from measured plate strains. The conventional interpretation is based on the assumption that the plate is under pure tension. A significant drawback of this is that the interfacial normal stresses iii cannot be deduced. A new technique is developed to deduce both interfacial shear and normal stresses from strain measurements. The thesis presents three PED strength models for the special case of an RC beam with the plate terminated in the constant moment region: a theoretical model based on interfacial fracture mechanics with a reasonable accuracy; a semi-empirical model with greater accuracy; and an empirical model that is slightly less accurate but simpler to apply than the semi-empirical model. This is followed by the development of a shear debonding model to predict the debonding failure in an RC beam with the plate terminated in high shear and a very low or zero moment region. The two models for PED failure in pure bending and pure shear zones are then combined to result in an accurate shear-bending interaction debonding model. An assessment of these models against a carefully constructed large test database shows that they are more accurate than existing models and suitable for implementation in design codes or guidelines. Finally, a structural mechanics formulation for an FRP-to-concrete bonded joint between two adjacent cracks is developed. It considers axial forces, transverse shear forces and bending moments in the adherends and uses a linearly softening bond-slip model. A section analysis with partial interaction and a rotational spring method are used to relate the applied loading to the interfacial deformation. A closed-form solution is obtained that may form the basis of a rational ICD design method.
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Augustine, Anusree. "Swelling induced debonding of thin hydrogel films grafted on silicon substrate : the role of interface physical-chemistry." Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLS040.

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Les revêtements d'hydrogel sont des réseaux de polymères transparents et hydrophiles capables d’abosrber plusieurs fois leur épaisseur en eau. Cependant, les contraintes induites par le gonflement du film peuvent entraîner un décollement préjudiciable de l'hydrogel ce qui peut limiter l’utilisation pratique des ces revêtements. Dans cette étude, nous proposons de décrire les mécanismes de décollement de films minces d’hydrogel en fonction de leur densité de greffage à l'interface film/substrat. Le but est de pouvoir contrôler et prédire la dégradation des revêtements hydrogel pendant le gonflement ou sous des contraintes de contact. Dans ce but, nous avons développé une méthodologie permettant de mesurer l'initiation et la propagation de la délamination induite par le gonflement de films minces d’hydrogel à partir de défauts d'interface préexistants bien contrôlés.Des films minces d'hydrogel de poly(diméthylacrylamide) (PDMA) attachés à la surface sont préparés sur des plaquettes de silicium à partir de la réticulation et du greffage simultanés (CLAG) de chaînes polymères fonctionnalisées par la chimie click thiol-ène. Cette stratégie permet de faire varier l'épaisseur du film (0.1 - 2 µm) et de contrôler le taux de gonflement du réseau, ici fixé à 2, tout en assurant une densité de réticulation homogène. Afin de faire varier la résistance de l'interface film/substrat, le substrat en silicium est greffé avec des mélanges de mercaptosilane (réactif) et de propylsilane (inerte) dans différentes proportions avant le dépôt du film mince. Alors que le mercaptosilane est capable de former des liaisons covalentes avec le réseau PDMA, le propylsilane ne réagit pas, ce qui permet de contrôler le taux de greffage du film mince d’hydrogel sur le substrat. Nous caractérisons la fraction de surface de mercaptosilane ainsi obtenue par des analyses XPS et TOF-SIMS. Par ailleurs, toujours à l’interface subtrat/film, des défauts linéaires bien contrôlés ayant une faible adhérence (largeur entre 10 et 100 µm) sont créés sur le substrat en passivant de façon localisée les groupes thiol réactifs par microlithographie. Ces défauts nucléent le décollement des films de façon bien localisée, ce qui permet ensuite de suivre la propagation de la décohésion à partir de ces défauts.Le décollement du film induit par le gonflement est réalisé sous un flux de vapeur constant assurant la saturation du film en eau. En observant le décollement progressif du film à partir des défauts linéaires préexistants, nous retrouvons un motif d’instabilité classique dit de fil de téléphone et nous montrons que le décollement résulte de contraintes de gonflement localisées proche de la ligne de décollement. Nous mesurons la vitesse de propagation du décollement dans la zone où le film est greffé sur le substrat et nous observons qu’elle augmente de deux ordres de grandeur lorsque la quantité de propylsilane dans le mélange de silanes réactifs passe de 0 à 90 %, c’est-à-dire lorsque le taux de greffage du film décroit. Un seuil d'épaisseur pour le décollement est également observé, les films pouvant se décoller étant d’autant plus minces que le taux de greffage du film ets faible. Les mesures de ce seuil sont discutées à partir d'un argument simple de mécanique de la rupture qui permet de rendre compte semi quantitativement de nos mesures
Hydrogel coatings are transparent and hydrophilic polymer networks that absorb a lot of water and can be suitable candidates for anti-mist coatings. However, swelling-induced stresses within the film can result in detrimental debonding of hydrogel and may fail. In this study, these debonding processes are investigated in the relation to the grafting density at the film/substrate interface, so as to control and predict the failure of the coatings during swelling or under contact stresses. For that purpose, we have developed a methodology consisting in monitoring the initiation and the propagation of swelling-induced delamination from well-controlled preexisting interface defects.Surface-attached poly(dimethylacrylamide) (PDMA) hydrogel thin films are prepared on silicon wafers from the simultaneous Cross-Linking And Grafting (CLAG) of functionalized polymer chains by thiol-ene click chemistry. This strategy allows to tune the film thickness (0.1-2 µm) while ensuring a homogeneous crosslinking density. In order to vary the strength of the film/substrate interface, the silicon wafer is grafted by mixing reactive mercaptosilane and unreactive propylsilane in various proportions prior to the formation of the hydrogel film. We characterize the mercaptosilane surface fraction thus obtained by XPS and TOF-SIMS analyses. Well-controlled line defects (width between 2 and 100 µm) are also created to nucleate delamination of the hydrogel from the substrate.Swelling-induced debonding of the film is achieved under a constant vapor flow ensuring water saturation. Optical observations show the progressive debonding of the film from the pre-existing line defects under the action of localized swelling stresses. We obtain a delamination pattern of typical so-called telephone cord instability. We measure the debonding propagation velocity where the hydrogel is grafted to the substrate. The debonding rate is found to decrease over two orders of magnitude when the amount of mercaptosilane in the reactive silane mixture is increased from 10% to 100% while increasing the covalent bonds between hydrogel and substrate. A threshold thickness for debonding is also observed. This threshold thickness increases with the amount of mercaptosilane used to graft the substrate. We derived quantitative values of the interface fracture energy from the measured thickness threshold with a simple fracture mechanics model
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Serttunc, Metin. "Effects of interfacial debonding and fiber breakage on static and dynamic buckling of fibers in matrices." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23874.

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Iwamoto, Sohei. "Analysis of multiple cracking and interfacial debonding of the galvannealed coating layer under applied tensile strain." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/77968.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第14575号
工博第3043号
新制||工||1453(附属図書館)
26927
UT51-2009-D287
京都大学大学院工学研究科材料工学専攻
(主査)教授 落合 庄治郎, 教授 粟倉 泰弘, 准教授 奥田 浩司
学位規則第4条第1項該当
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Zu, Seung-Don. "The effect of irregular fiber distribution and error in assumed transverse fiber CTE on thermally induced fiber/matrix interfacial stresses." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3800.

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Thermally induced interfacial stress states between fiber and matrix at cryogenic temperature were studied using three-dimensional finite element based micromechanics. Mismatch of the coefficient of thermal expansion between fiber and matrix, and mismatch of coefficient of thermal expansion between plies with different fiber orientation were considered. In order to approximate irregular fiber distributions and to model irregular fiber arrangements, various types of unit cells, which can represent nonuniformity, were constructed and from the results the worst case of fiber distributions that can have serious stress states were suggested. Since it is difficult to measure the fiber transverse coefficient of thermal expansion at the micro scale, there is an uncertainty problem for stress analysis. In order to investigate the effect of error in assumed fiber transverse coefficient of thermal expansion on thermally induced interfacial stresses, systematic studies were carried out. In this paper, the effect of measurement errors on the local stress states will be studied. Also, in order to determine fiber transverse CTE values from lamina properties, a back calculation method is used for various composite systems.
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Daissè, Gilda. "Interfacial bond behavior of steel-FRCM composites applied to a masonry substrate." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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In the last decades the theme of structural rehabilitation has acquired great importance and the adoption of composite materials in civil engineering applications has been a turning point in this field. The cement-based matrix of FRCM composites presents many advantages for their application to historical buildings. This dissertation presents a study of the influence of composite bonded length and width on the load response and failure mode. Two types of mortar matrix and two different steel densities were employed. The classical push pull configuration is adopted where fibers are pulled while the masonry block is restrained. Based on the experimental results and through a fracture mechanics approach, the cohesive material laws for mode II was obtained. For the completeness of the work, the characterization of each material involved in the single-lap shear test has been achieved.
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Murray, Katie Virginia. "Characterization of the Interfacial Fracture of Solvated Semi-Interpenetrating Polymer Network (S-IPN) Silicone Hydrogels with a Cyclo-Olefin Polymer (COP)." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/31918.

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As hydrogel products are manufactured and used for applications ranging from biomedical to agricultural, it is useful to characterize their behavior and interaction with other materials. This thesis investigates the adhesion between two different solvated semi-interpenetrating polymer network (S-IPN) silicone hydrogels and a cyclo-olefin (COP) polymer through experimental, analytical, and numerical methods.

Interfacial fracture data was collected through the application of the wedge test, a relatively simple test allowing for the measurement of fracture properties over time in environments of interest. In this case, the test was performed at discrete temperatures within range of 4Ë C to 80Ë C. Two COP adherends were bonded together by a layer of one of the S-IPN silicone hydrogels. Upon the insertion of a wedge between the two adherends, debonding at one of the two interfaces would initiate and propagate at a decreasing rate. Measurements were taken of the debond length over time and applied to develop crack propagation rate versus strain energy release rate (SERR) curves. The SERR values were determined through the application of an analytical model derived for the wedge test geometry and to take into account the effects of the hydrogel interlayer. The time-temperature superposition principle (TTSP) was applied to the crack propagation rate versus SERR curves by shifting the crack propagation rates with the Williams-Landel-Ferry (WLF) equation-based shift factors developed for the bulk behavior of each hydrogel. The application of TTSP broadened the SERR and crack propagation rate ranges and presented a large dependency of the adhesion of the system on the viscoelastic nature of the hydrogels. Power-law fits were applied to the master curves in order to determine parameters that could describe the adhesion of the system and be applied in the development of a finite element model representing the interfacial fracture that occurs for each system. The finite element models were used to validate the analytical model and represent the adhesion of the system such that it could be applied to future geometries of interest in which the S-IPN silicone hydrogels are adhered to the COP substrate.

[Files modified per J. Austin, July 9, 2013 GMc]
Master of Science

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Ammar, Ahmed. "Simulation numérique du comportement et de l'endommagement d'un matériau composite à fibres courtes : application au PA6/GF30 sous conditions environnementales." Electronic Thesis or Diss., Amiens, 2021. http://www.theses.fr/2021AMIE0080.

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Les travaux menés dans le cadre de cette thèse ont pour objectif le développement d'une approche numérique performante, basée sur la Méthode des Éléments Discrets (MED) pour simuler le comportement hygro-thermo-mécanique d'un matériau composite à fibres de verre courtes. La modélisation discrète proposée est mise en œuvre dans le cas d'un matériau composite Polyamide 6 renforcé avec 30% de fibres de verre (PA6/GF30). Tout d'abord, les propriétés mécaniques ainsi que les mécanismes d'endommagement du PA6/GF30 sont évalués expérimentalement. Ensuite, un modèle 3D par Éléments Discrets(ED), en s'appuyant sur une méthodologie originale, est développé et validé par comparaison avec des approches micromécaniques et des résultats expérimentaux,en termes de propriétés élastiques. Par ailleurs, le modèle discret mis au point est exploité afin de simuler le processus de délamination en mode I, II et mixte en utilisant un modèle de zone cohésive 3D définit selon une loi de traction-séparation bilinéaire. La décohésion interfaciale fibre/matrice sous sollicitations mécaniques, respectivement dans le cas d'un composite mono-fibre et multifibre est également étudiée. Compte tenu du caractère hydrophile du PA6, l'introduction du modèle de décohésion trouve son intérêt dans la prise en compte de l'endommagement interfacial dû à l'absorption d'eau à l'interface fibre/matrice en présence d'humidité. Par conséquent, des paramètres hygro-thermo-mécaniques sont intégrés au modèle ED afin de tenir compte du gonflement hygroscopique et de l'endommagement du PA6/GF30 dans une large gamme de conditions environnementales. Des comparaisons avec la Méthode des Éléments Finis (MEF) ont été établies afin de vérifier la validité du modèle ED proposé
This thesis work aims at developing a powerful numerical tool based on the Discrete Element Method (DEM) to simulate the hygro-thermo-mechanical behaviour of a short glass fibre composite material. The proposed discrete modelling is performed in the case of a Polyamide 6 composite material reinforced with 30% of glass fibres (PA6/GF30). First of all, mechanical properties as well as damage mechanisms of PA6/GF30 are evaluated using experimental campaign. Then, a 3D Discrete Element (DE) model based on an original methodology is developed and validated by comparison with micromechanical approaches and experimental results in terms of elastic behaviour of PA6/GF30. Furthermore, the developed discrete model is exploited to simulate delamination process on mode I, II and mixed mode using a 3D cohesive zone model with a bilinear tractionseparation law. The fibre/matrix interfacial decohesion under mechanical stress,respectively in the case of a single-fibre and multi-fibre composite is also studied. Given the hydrophilic nature of PA6, the introduction of the decohesion model is interesting in order to take into account the interfacial damage due to water absorption at the fibre/matrix interface in the presence of moisture. Therefore, hygro-thermo-mechanical parameters are integrated into the discrete model in order to take into account the hygroscopic swelling and the damage of PA6/GF30 material under a wide range of environmental conditions. Comparisons with the Finite Element Method (FEM) have been established to check out the validity of the proposed DE model
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Books on the topic "Interfacial Debonding"

1

Z, Voyiadjis G., and Allen David H. 1950-, eds. Damage and interfacial debonding in composites. Amsterdam: Elsevier, 1996.

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Serttunc, Metin. Effects of interfacial debonding and fiber breakage on static and dynamic buckling of fibers in matrices. Monterey, Calif: Naval Postgraduate School, 1992.

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Damage and Interfacial Debonding in Composites. Elsevier, 1996. http://dx.doi.org/10.1016/s0922-5382(96)x8001-2.

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Allen, D. H. Damage and Interfacial Debonding in Composites. Elsevier Science & Technology Books, 1996.

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Book chapters on the topic "Interfacial Debonding"

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Hartingsveldt, E. A. A. van. "Detection of Interfacial Debonding in Particle- Reinforced Composites." In Polymer Composites, edited by Blahoslav Sedlácek, 569–74. Berlin, Boston: De Gruyter, 1986. http://dx.doi.org/10.1515/9783110856934-054.

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Ning, Jian Guo, and Fang Jiang. "Elastoplastic Behavior of Particle Reinforced Composites Considering the Effect of Interfacial Debonding." In Engineering Plasticity and Its Applications, 125–30. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-433-2.125.

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Ju, Jiann-Wen Woody, and Yu-Fu Ko. "Micromechanical Elastoplastic Damage Modeling of Evolutionary Interfacial Arc Debonding for Fiber Reinforced Composites." In Handbook of Damage Mechanics, 1055–92. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4614-5589-9_11.

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Fowai, Issa, Martin Noël, Beatriz Martin-Perez, and Leandro Sanchez. "Evaluation of interfacial debonding of fibre-reinforced polymer using variable angle peel test." In Bridge Safety, Maintenance, Management, Life-Cycle, Resilience and Sustainability, 2526–32. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003322641-315.

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Ju, Jiann-Wen Woody, and Yu-Fu Ko. "Micromechanical Elastoplastic-Damage Modeling of Evolutionary Interfacial Arc Debonding for Fiber-Reinforced Composites." In Handbook of Damage Mechanics, 1–35. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-8968-9_11-1.

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Liu, Chun Jun, Yue Zhang, Da Hai Zhang, and Zhong Ping Li. "Finite Element Analysis of Interfacial Debonding Damage in Fiber-Reinforced Ceramic Matrix Composites." In Materials Science Forum, 1555–58. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.1555.

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Tahir, M. N., and E. Hamed. "Influence of interfacial debonding on the nonlinear structural response of profiled metal-faced insulating sandwich panels." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 452–56. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348443-74.

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Tahir, M. N., and E. Hamed. "Influence of interfacial debonding on the nonlinear structural response of profiled metal-faced insulating sandwich panels." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 159–60. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348450-74.

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Chen, Jian Kang, and Liu Hong Chang. "The Effect of the Property of Non-Linear Viscosity on the Interfacial Debonding of Particulate-Reinforced Polymers." In Fracture and Damage Mechanics V, 113–16. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-413-8.113.

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Mohammadi Firouz, R., L. M. P. Matos, Eduardo B. Pereira, and Joaquim A. O. Barros. "Analysis of the Interfacial Debonding Behaviour of NSM CFRP Laminates with Cement-Based Adhesive Using Digital Image Correlation Technique." In RILEM Bookseries, 301–11. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76547-7_25.

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Conference papers on the topic "Interfacial Debonding"

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CHU, JOU-MEI, BENJAMIN CLAUS, BOON HIM LIM, DANIEL O’BRIEN, TAO SUN, KAMEL FEZZAA, and WAYNE CHEN. "Visualization of Fiber/Matrix Interfacial Transverse Debonding." In American Society for Composites 2018. Lancaster, PA: DEStech Publications, Inc., 2018. http://dx.doi.org/10.12783/asc33/25947.

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Ahmed, Waleed K. "SIF Prediction of Nanocomposite With Interfacial Debonding." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36399.

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Local debonding in nanofiber/matrix interface of a nanofiber reinforced composite has been considered as one of the most important factors that can significantly reduce the composite stiffness as well as increases the interfacial stresses levels which eventually causes composite failure. In the present study, the debonded zone is considered as an interfacial defect and modeled to be a circumferential crack. Linear Elastic Fracture Mechanic (LEFM) was used to investigate the impact of a nanofiber/matrix debonded interface in a nanocomposite through estimating Stress Intensity Factor (SIF). Finite element analysis (FEA) has been carried out to investigate SIF along the debonded edge using 3D-axisymmetric method, and this was done through modeling half of the representative volume element (RVE). A representative volume element of the nanocomposite was modeled and analyzed to explore SIF. Mainly, RVE consists of a nanofiber confined by a matrix and subjected to uniaxial tensile stress. A longitudinal debonding is proposed along the interfacial nanofiber/matrix. It has been shown that FE results indicates a significant impact of the debonding on the SIF of the nanocomposite.
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"Experimental Investigation of FRCM-Concrete Interfacial Debonding." In "SP-298: Advanced Materials and Sensors Towards Smart Concrete Bridges: Concept, Performance, Evaluation, and Repair". American Concrete Institute, 2014. http://dx.doi.org/10.14359/51687076.

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Liu, H. T., L. Z. Sun, and J. W. Ju. "An Interfacial Debonding Model for Particle-Reinforced Composites." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33106.

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To simulate the evolution process of interfacial debonding between particle and matrix, and to further estimate its effect on the overall elastic behavior of particle-reinforced composites, a two-level microstructural-effective damaged model is developed. The microstructural damage mechanism is governed by the interfacial debonding of reinforcement and matrix. The progressive damage process is represented by the debonding angles that are dependent on the external loads. For those debonded particles, the elastic equivalency is constructed in terms of the stiffness tensor. Namely, the isotropic yet debonded particles are replaced by the orthotropic perfect particles. The volume fraction evolution of debonded particles is characterized by the Weibull’s statistical approach. Mori-Tanaka’s method is utilized to determine the effective stiffness tensor of the resultant multi-phase composites. The proposed constitutive framework is developed under the general three-dimensional loading condition. Examples are conducted to demonstrate the capability of the proposed model.
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Tenorio, Max, and Assimina A. Pelegri. "On Interfacial Fracture Toughness Measurements of a Single Glass Fiber." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89800.

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The interfacial relationship between a glass fiber bundle and epoxy resin is investigated. A cylindrical notched specimen with a single bundle of fibers along the axis is created to observe debonding behavior. It is subsequently subjected to a quasi-static tensile test. The purpose of the test is to examine the interfacial debonding between fiber and resin from the point of breakage. All specimens reached a critical stress value and exhibited debonding to some degree. Experimental composite material properties are calculated and compared to technical data.
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Dvorak, George J., and Jian Zhang. "Evolution of Interfacial Decohesion in Particulate Composites." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/amd-25418.

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Abstract Evolution of distributed damage in heterogeneous solids is modeled using the Transformation Field Analysis method [Proc. R. Soc. Lond. A (1992) 437, 311–327] and selected models of interface debonding in fibrous or particulate composites, as described in detail in the forthcoming paper [J. Mech. Phys. Solids Boehler Memorial Volume, 2001]. In this approach, stress changes caused by local debonding under increasing overall loads are represented by residual stresses generated by damage-equivalent eigenstrains that act together with the applied mechanical loading program and physically based local transformation strains on an undamaged elastic aggregate. Damage rates are derived from a prescribed probability distribution of interface strength and local energy released by debonding. Numerical simulations of damage evolution in a glass/elastomer composite indicate which of these two conditions controls the process at different reinforcement densities and overall stress states. In general, the energy released by a single particle at given overall stress decreases with increasing reinforcement density, and in proportion to particle size. Therefore, dense reinforcement by smaller-diameter particles or fibers should enhance damage resistance of composite systems.
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Paulino, G. H., H. M. Yin, L. Z. Sun, Glaucio H. Paulino, Marek-Jerzy Pindera, Robert H. Dodds, Fernando A. Rochinha, Eshan Dave, and Linfeng Chen. "Micromechanics-Based Interfacial Debonding Model of Functionally Graded Materials." In MULTISCALE AND FUNCTIONALLY GRADED MATERIALS 2006. AIP, 2008. http://dx.doi.org/10.1063/1.2896884.

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Womack, S., and M. S. Ingber. "Interfacial debonding and damage progression in particle-reinforced composites." In BEM 30. Southampton, UK: WIT Press, 2008. http://dx.doi.org/10.2495/be080131.

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Pan, Yi, and Assimina A. Pelegri. "Interfacial Debonding and Stress Field Analysis on a Single Fiber Composite Using FEM." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68560.

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Fiber debonding in a bundled fiber reinforced polymer composite is investigated by using finite element method and cohesive zone model. Fiber and matrix are modeled as isotropic and linear elastic materials. Fiber/matrix interface is represented by a cohesive zone model governed by the traction-separation law. Effects of interfacial strength on interfacial debonding and stress field in the bundled fiber composite are examined. The stress field of the debonding composite is compared to that of perfectly bonded composite.
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Deng, Jun, Marcus M. K. Lee, Jian-he Xie, and Pei-yan Huang. "Interfacial debonding in steel beams strengthened by externally bonded CFRP." In International Conference on Experimental Mechnics 2008 and Seventh Asian Conference on Experimental Mechanics, edited by Xiaoyuan He, Huimin Xie, and YiLan Kang. SPIE, 2008. http://dx.doi.org/10.1117/12.839032.

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Reports on the topic "Interfacial Debonding"

1

Lee, Richard. PR-398-133719-R02 Inspection of Composite Repairs for Pipelines and Piping - Phase 3 Further NDE Trials. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), April 2020. http://dx.doi.org/10.55274/r0011662.

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In the current extension of the work, three additional inspection trials were successfully completed by two NDE vendors, Sonomatic Ltd and Testex, Inc. The Sonomatic inspection team used two advanced ultrasonic techniques, M-skip and Dynamic Response Spectroscopy (DRS). The Testex team used an existing Low Frequency Electromagnetic Technique (LFET) and a recently developed Off-Surface Electromagnetic Technique (OSET). Both electromagnetic tests are complementary. The LFET was designed to scan bare metals as well as through paints and protective coatings. OSET has been specifically developed for inspection of corrosion (and girth weld location) under insulation (CUI). Both M-skip and LFET/ OSET successfully reported the correct axial/ circumferential location and extent of the external pipe wall defects as well as the location of the longitudinal ERW seam welds. The DRS technique, successfully detected the debonded regions that contained interlaminar and interfacial debonding.
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Lee, Wall, and Burch. L52333 NDE and Inspection Techniques Applied to Composite Wrap Repairs. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), June 2012. http://dx.doi.org/10.55274/r0010468.

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The objective includes: Assess commercially available inspection methods to validate integrity of composite repair systems. Identify applicability to inspect composite overwrap and parent metal for both onshore and sub-sea pipelines (where information is available). Identify sources of data to include other users of composite materials(aerospace/aircraft, naval/ship repairs). Identify procedures and technologies to assess inspection effectiveness and provide a gap analysis. Interface with other PRCI projects on long-term testing of composite repairs and other joint industry projects on composite repairs to improve our understanding of long term durability of repairs. Identify global experience with composite repairs; not just North America. For general wall loss, radiography or electromagnetic techniques appear to be the best candidates. Standard radiography techniques can detect changes in wall thickness over a large area. Saturated low frequency systems, e.g. SLOFEC are good for a quick rapid scan of the area of interest. Pulsed eddy current, e.g. PEC, is also available for a general survey of the underlying substrate. For pinhole leaks, the electromagnetic techniques do not have sufficient resolution to detect defects of order 20 mm (0.8 in.) diameter and less. Standard radiography techniques can detect pinhole leaks down to diameters of 3 mm (0.12 in.) or less. Tangential radiography techniques are generally good for defect sizing but there are practical limitations with chord length (i.e. beam path through the pipe wall). Ultrasonic techniques could offer a potential solution but is currently limited due to the high attenuation of the composite repair material where through the repair inspection could only detect large diameter defects greater than 25 mm (1 in.) diameter on thin repairs less than 5 mm (0.2 in.). Detecting pin hole defects by applying the ultrasound along the axial direction of the substrate, effectively skipping the ultrasound under the repair, showed more promise. For delamination or debonding of the interface between the composite laminate and the steel substrate, laser shearography and microwave inspection appear to offer the best solution. Currently there is no single inspection technique that can be applied with confidence to the inspection of interfacial delaminations. Further developments are on-going to provide a solution to this challenging inspection problem. Acoustic emission is able to give an overall picture of the damage within the composite under live loads. It can be used as a QA tool to test the integrity of the repair. However, it is difficult to interpret the signals to gain any quantitative information about a particular defect.
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