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Artykuły w czasopismach na temat „Delamination”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Mei, Hanfei, Asaad Migot, Mohammad Faisal Haider, Roshan Joseph, Md Yeasin Bhuiyan, and Victor Giurgiutiu. "Vibration-Based In-Situ Detection and Quantification of Delamination in Composite Plates." Sensors 19, no. 7 (2019): 1734. http://dx.doi.org/10.3390/s19071734.

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This paper presents a new methodology for detecting and quantifying delamination in composite plates based on the high-frequency local vibration under the excitation of piezoelectric wafer active sensors. Finite-element-method-based numerical simulations and experimental measurements were performed to quantify the size, shape, and depth of the delaminations. Two composite plates with purpose-built delaminations of different sizes and depths were analyzed. In the experiments, ultrasonic C-scan was applied to visualize the simulated delaminations. In this methodology, piezoelectric wafer active

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2

Panda, Rabi S., Prabhu Rajagopal, and Krishnan Balasubramaniam. "Characterization of delamination-type damages in composite laminates using guided wave visualization and air-coupled ultrasound." Structural Health Monitoring 16, no. 2 (2016): 142–52. http://dx.doi.org/10.1177/1475921716666411.

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This article reports on the characterization of delamination damages in composite laminates using wave visualization method. A combination of plate-guided ultrasound and air-coupled ultrasonics is used to locate and visualize delaminations. The study focuses on the physics of Lamb wave propagation and interaction with delaminations at various through-thickness locations and positions. Three-dimensional finite element simulations are used to study, in detail, the changes in wave features such as mode velocity, wavelength and wave refraction in the delamination region. These wave features provid

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3

Ueda, Masahito, and Akira Todoroki. "Asymmetrical Dual Charge EPCM for Delamination Monitoring of CFRP Laminate." Key Engineering Materials 321-323 (October 2006): 1309–15. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.1309.

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CFRP laminate is sensitive to impacts. Even a low impact creates delamination, bringing deterioration of the structural reliability. Monitoring for delamination is, therefore, indispensable to maintain the reliability of a CFRP structure. In this study, asymmetrical dual charge electric potential change method was introduced to estimate a delamination in the CFRP laminate. Delaminations were estimated using response surfaces as solver of the inverse problem. Learning data of response surfaces were calculated by FEM analyses. Actual delaminations in the CFRP laminate were successfully identifie

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4

Ellison, Andrew, and Hyonny Kim. "Shadowed delamination area estimation in ultrasonic C-scans of impacted composites validated by X-ray CT." Journal of Composite Materials 54, no. 4 (2019): 549–61. http://dx.doi.org/10.1177/0021998319865311.

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Although ultrasonic pulse-echo C-scanning is a mature non-destructive evaluation technique for imaging internal damage in composite structures, a major impediment of obtaining a full characterization of the internal damage state is delamination shadowing effects. Specifically, shadowing refers to regions of interest that are behind other delamination planes or discontinuities with respect to the scanning surface. The delamination planes block ultrasonic wave transmission and the regions of interest are thus hidden (i.e. shadowed) from the scan. A methodology has been developed to expand ultras

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5

Zhang, Zhi Fang, Krishna Shankar, Murat Tahtali, and Evgeny V. Morozov. "Graphical Detection Method for Delaminations." Applied Mechanics and Materials 66-68 (July 2011): 1410–15. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.1410.

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In this paper, a simple graphical method for the detection of delaminations in damaged composite laminates is introduced. By using this method, both delamination size and location can be predicted accurately. First, a frequency database for the damaged beams with a range of delamination sizes and locations is generated using a Finite Element (FE) model; then for each mode, a surface plot relating the delamination size, location and frequency shift is generated. The next step is to look up the actual frequency shift (either from numerical simulation or experiment) from surface plots relating to

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6

Hwang, Shun Fa, and Horng Ming Chen. "Compression Tests of Unidirectional Composite Laminates with Two Delaminations." Key Engineering Materials 306-308 (March 2006): 381–86. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.381.

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Compression tests are conducted on composite laminates consisting of 16 unidirectional carbon/epoxy layers with two through-width delaminations. Two types of delamination length and location are considered. One is that a short delamination is located at the middle surface along the thickness direction and a long delamination is positioned between the second layer and the third layer. The other is that a long delamination is located at the middle surface and the position of the short elamination is between the second layer and the third layer. The results indicate that if the long delamination

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7

Bhat, Sunil, and S. Narayanan. "Numerical investigations on delaminated Glare under uni-axial tension." International Journal of Structural Integrity 7, no. 4 (2016): 553–70. http://dx.doi.org/10.1108/ijsi-07-2015-0021.

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Purpose – Since failure of laminated composites by delaminations is common, the purpose of this paper is to present a numerical procedure to check the stability of delaminations in fiber metal laminate (Glare), with different possible damage configurations, under uni-axial tension. Deformation behavior of the laminate is also examined. Influence of the type and the extent of damage, represented by varying sizes and number of delaminations, on delamination driving force and laminate deformation is found. Design/methodology/approach – Delaminated Glare is modeled by finite element method. Interf

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8

Kardomateas, G. A. "The Initial Post-buckling and Growth Behavior of Internal Delaminations in Composite Plates." Journal of Applied Mechanics 60, no. 4 (1993): 903–10. http://dx.doi.org/10.1115/1.2901000.

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The initial post-buckling and growth behavior of delaminations in plates is studied by a perturbation procedure. In this work, no restrictive assumptions regarding the delamination thickness and plate length are made, i.e., the usual thin film assumptions are relaxed. The perturbation procedure is based on an asymptotic expansion of the load and deformation quantities in terms of the distortion parameter of the delaminated layer, the latter being considered a compressive elastica. Closed-form solutions for the load and midpoint delamination deflection versus applied compressive displacement du

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9

Xing, Shutao, Marvin W. Halling, and Paul J. Barr. "Delamination Detection of Reinforced Concrete Decks Using Modal Identification." Journal of Sensors 2012 (2012): 1–17. http://dx.doi.org/10.1155/2012/156583.

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This study addressed delamination detection of concrete slabs by analyzing global dynamic responses of structures. Both numerical and experimental studies are presented. In the numerical examples, delaminations with different sizes and locations were introduced into a concrete slab; the effects of presence, sizes, and locations of delaminations on the modal frequencies and mode shapes of the concrete slab under various support conditions were studied. In the experimental study, four concrete deck specimens with different delamination sizes were constructed, and experimental tests were conducte

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10

Ding, Wenxiang, Maxime Bavencoffe, and Marc Lethiecq. "Modeling and Experimental Characterization of Bonding Delaminations in Single-Element Ultrasonic Transducer." Materials 14, no. 9 (2021): 2269. http://dx.doi.org/10.3390/ma14092269.

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Ultrasonic transducers performance can be seriously deteriorated by loss of adhesion between some constitutive elements such as the active element, the backing, or the matching layer. In the present work, the influence of bonding delaminations on the performance of a single-element ultrasonic transducer, which is composed of a piezoelectric disk, a backing, and a matching layer, is studied numerically and experimentally. Based on the positions between layers, two cases, i.e., delaminations between ceramic and backing or between ceramic and matching layer, are considered. Each case involves thr

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11

Yang, Zheng, Chun Yong Huo, and Wanlin Guo. "The Charpy Notch Impact Test of X70 Pipeline Steel with Delamination Cracks." Key Engineering Materials 297-300 (November 2005): 2391–96. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.2391.

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The effects of thickness, notch orientation and delamination cracks on the impact toughness of X70 pipeline steel are investigated experimentally by use of the instrumented Charpy impact tests at different temperatures. The couple effect of delamination cracks, thickness, notch orientation and temperature is discovered. The delamination cracks have certain direction, and their amount and size are related to the temperature and the specimen thickness. Though the delaminating orientations of T-S and T-L specimen are not same, the reasons for both T-S and T-L specimen delaminating are that the we

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12

Makeev, A., and E. Armanios. "A Geometrically Nonlinear Model for Laminated Composite Strips With Extension-Twist Coupling in the Presence of Delamination." Journal of Applied Mechanics 65, no. 3 (1998): 685–93. http://dx.doi.org/10.1115/1.2789112.

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A geometrically nonlinear analysis for the extension-twist coupling in pretwisted laminated composite strips in the presence of delamination is developed. Closed-form solutions for strips with internal and edge delaminations are obtained. A parametric study is performed to investigate the influence of delamination length, material system, and stacking sequence on the extension-twist coupling in a class of hygrothermally stable laminates. The model predictions are in good agreement with test data. The results indicate that internal delamination has a negligible influence on the extension-twist

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13

Hosseini-Toudeshky, Hossein, M. Saeed Goodarzi, and Bijan Mohammadi. "Multiple Delaminations Growth in Composite Laminates under Compressive Cyclic Loading in Post-Buckling." Applied Mechanics and Materials 225 (November 2012): 195–200. http://dx.doi.org/10.4028/www.scientific.net/amm.225.195.

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Due to discontinuity of mechanical properties in composite laminates, failure occurs in different damage mechanisms. Delamination growth of adjacent layers is a major failure mechanism in laminates with various layup configurations. Pre existing delamination may initiate in composite laminate before use, due to impact in assembly and fabrication process. Cyclic compressive loading may cause delamination growth due to both post-bucking behavior and fatigue nature of loading. In this paper, a 3D mixed-mode interface element model has been developed to simulate the growth of multiple delamination

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14

Toscano, Cinzia, Aniello Riccio, FrancescoPaolo Camerlingo, and Carosena Meola. "On the use of lock-in thermography to monitor delamination growth in composite panels under compression." Science and Engineering of Composite Materials 21, no. 4 (2014): 485–92. http://dx.doi.org/10.1515/secm-2013-0156.

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AbstractThe success of composites in automotive, aerospace, and naval applications is mainly related to their aptitude to be tailored to obtain a final product that perfectly fulfills the design requirements. However, during both manufacturing processes and maintenance, some flaws, like delaminations (which may escape simple visual inspection), may be induced in composite structures. The presence of delaminations is of major concern for the load-carrying capability of carbon fiber-reinforced polymer panels. Indeed, delaminations can strongly affect the structural strength and may grow under in

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15

Sreekanth, T. G., M. Senthilkumar, and S. Manikanta Reddy. "Natural Frequency based delamination estimation in GFRP beams using RSM and ANN." Frattura ed Integrità Strutturale 16, no. 61 (2022): 487–95. http://dx.doi.org/10.3221/igf-esis.61.32.

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The importance of delamination detection can be understood from aircraft components like Vertical Stabilizer, which is subjected to heavy vibration during the flight movement and it may lead to delamination and finally even flight crash can happen because of that. Any solid structure's vibration behaviour discloses specific dynamic characteristics and property parameters of that structure. This research investigates the detection of delamination in composites using a method based on vibration signals. The composite material's flexural stiffness and strength are reduced as a result of delaminat

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16

Chattopadhyay, Aditi, Changho Nam, and Youdan Kim. "Damage Detection and Vibration Control of a Delaminated Smart Composite Plate." Advanced Composites Letters 9, no. 1 (2000): 096369350000900. http://dx.doi.org/10.1177/096369350000900101.

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In this paper, the effects of delamination on the dynamic characteristics of a composite plate are investigated. The refined higher order theory is used to model the smart composite plate in the presence of delaminations. The theory accurately captures the transverse shear deformation through the thickness, which is important in anisotropic composites, particularly in the presence of discrete actuators and sensors and delaminations. Next, the detection of delamination is investigated using the Root Mean Square (RMS) values of the response of the composite plate subject to disturbances. An acti

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17

Yang, Zheng, Hyeon Gyu Beom, Chang Boo Kim, and Chong Du Cho. "Different Delamination Cracks during Fracture and Their Influences on the Fracture of X70 Pipeline Steel." Advanced Materials Research 33-37 (March 2008): 91–96. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.91.

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Single or multiple of delaminations have been found frequently on the fracture surface of X70 pipeline steel. In this study, the delamination cracks and their influence on the fracture of pipeline are investigated by both experiment and three-dimensional fracture analyses. It is shown that the three-dimensional stress state is prerequisite for delamination crack and the strength distribution of material influences the form and direction of delamination crack. The delamination cracks are produced on the weak interfaces among the material by the tensile stress perpendicular to them before the fr

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18

Huh, Jungwon, Quang Huy Tran, Jong-Han Lee, DongYeob Han, Jin-Hee Ahn, and Solomon Yim. "Experimental Study on Detection of Deterioration in Concrete Using Infrared Thermography Technique." Advances in Materials Science and Engineering 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/1053856.

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Concrete is certainly prone to internal deteriorations or defects during the construction and operating periods. Compared with other nondestructive techniques, infrared thermography can easily detect the subsurface delamination in a very short period of time, but accurately identifying its size and depth in concrete is a very challenging task. In this study, experimental testing was carried out on a concrete specimen having internal delaminations of various sizes and at varying depths. Delaminations at 1 and 2 cm deep showed a good temperature contrast after only 5-minute heating, but delamina

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19

Mahjabin Momo, Mantaka, Nur Yazdani, and Eyosias Beneberu. "Quantifying Shallow-Depth Concrete Delamination using Impact-Echo." Athens Journal of Τechnology & Engineering 10, no. 3 (2023): 147–60. http://dx.doi.org/10.30958/ajte.10-3-1.

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Corrosion-induced concrete deck delamination is quite common in bridges. Locating these embedded delaminations is important to assess the extent of the damage, the remaining member capacity and any necessary rehabilitation. The impact-echo (IE) is a simple and straightforward non-destructive testing (NDT) technique by which the depth and extent of concrete delamination may be estimated. It is effective in detecting the location and determining the depth of relatively deep delaminations in concrete. Delaminations that occur near the concrete surface can also be detected by the IE method. Howeve

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20

Mahieddine, Ali, and Mohammed Ouali. "Analysis of Delaminated Composite Plates." Advanced Materials Research 686 (April 2013): 104–8. http://dx.doi.org/10.4028/www.scientific.net/amr.686.104.

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A mathematical model for plates with partially delaminated layers is presented to investigate their behavior. In this formulation account is taken of lateral strains. The principal advantage of the element is that it allows the modeling of delamination anywhere in the structure. The region without delamination is modeled to carry constant peel and shear stresses; while the region with delamination is modeled by assuming that there is no peel and shear stress transfer between the top and bottom layers. Numerical results of the present model are presented and its performance is evaluated for sta

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21

Cai, Xiao Jiang, Sheng Qin, Qing Long An, Hong Zhou Zhang, Shu Han, and Ming Chen. "Experimental Analysis on Delamination Damage by Acoustic Emission in High Speed Drilling of Carbon Fiber Reinforced Plastics." Key Engineering Materials 589-590 (October 2013): 287–92. http://dx.doi.org/10.4028/www.scientific.net/kem.589-590.287.

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Carbon fiber reinforced plastics (CFRP) has increasing applications in aerospace and other fields, due to low density, high strength, high stiffness, great resistance to corrosion, etc. Although, delamination damages in drilling holes for assembly influence the final characteristics of CFRP components. This paper presents an experimental investigation to analyze delamination damage, in which acoustic emission and thrust force are monitored during drilling CFRP laminates to clarify the relationship between AE signals and delamination damages. The results show that delamination damage has close

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22

Limanovskis, Valdemaras, Igor Iljin, and Nikolaj Šešok. "INVESTIGATION INTO DELAMINATION." Mokslas - Lietuvos ateitis 2, no. 4 (2010): 10–12. http://dx.doi.org/10.3846/mla.2010.059.

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The paper investigates the process of delaminatinon. The carried out test included seven grades of paper and two types of lamination films (gloss and mat). Delamination was investigated at different ink coverage making from 400% to 90%. It was established that delamination was influenced by the properties of the paper, ink drying time, ink coverage, the type of a lamination film and folding direction. The optimal dependence of the lamination film on printing combination was established.

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Gopal, P., L. R. Dharani, and S.-C. Yen. "Measurement of Delamination Fracture Energy Using Stepped Laminates." Advanced Composites Letters 1, no. 4 (1992): 096369359200100. http://dx.doi.org/10.1177/096369359200100402.

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Delamination is often the mode of failure in laminated composites. Therefore the quantification of delamination fracture energy is of vital importance. In this work, externally stepped graphite/epoxy (T300/934) laminates are tested in flexure, resulting in a series of delaminations at 0/90 interface. The delamination fracture energy is calculated based on the strain energy released and is found to be 535 J/m2. This value is in good agreement with the mode II strain energy release rate obtained by other workers.

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Brunner, Andreas J., René Alderliesten, and John-Alan Pascoe. "In-Service Delaminations in FRP Structures under Operational Loading Conditions: Are Current Fracture Testing and Analysis on Coupons Sufficient for Capturing the Essential Effects for Reliable Predictions?" Materials 16, no. 1 (2022): 248. http://dx.doi.org/10.3390/ma16010248.

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Quasi-static or cyclic loading of an artificial starter crack in unidirectionally fibre-reinforced composite test coupons yields fracture mechanics data—the toughness or strain-energy release rate (labelled G)—for characterising delamination initiation and propagation. Thus far, the reproducibility of these tests is typically between 10 and 20%. However, differences in the size and possibly the shape, but also in the fibre lay-up, between test coupons and components or structures raise additional questions: Is G from a coupon test a suitable parameter for describing the behaviour of delaminati

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Bazardehi, Sayyed Roohollah Kazemi, and Mohammad Ali Kouchakzadeh. "Detection of delamination in composite laminated plates using filtered mode shapes." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 12 (2012): 2902–11. http://dx.doi.org/10.1177/0954406212442052.

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Filtered mode shapes are used to detect the presence, location, size and shape of the delaminations in composite laminated plates with various boundary conditions. This method is the extension of a previous study by the authors on the delamination detection in the beams using irregularities of the mode shapes. The mode shapes are filtered to separate the smooth and irregular parts. Presence and situation of delamination affects these separated parts, and these effects are used to detect the delamination. Here, two new indicators, named ‘slope of smooth part’ and ‘irregularities in the slope of

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Yeh, Meng Kao, and In Shung Lee. "Delamination Growth in Ball Grid Array Electronic Package." Key Engineering Materials 306-308 (March 2006): 363–68. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.363.

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The delamination problem in plastic ball grid array electronic package was investigated analytically and experimentally. The ANSYS code was used in the analysis to find the deformation and the stress distribution in electronic package due to the thermal mismatch between different materials at reflow temperature with saturated moisture pressure at the delaminated region. The stress intensity factor and the strain energy release rate at the tip of interfacial delamination were calculated using the fracture mechanics approach. The results show that the delaminaton occurs at the corner of the die

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Chew, Michael Yit Lin, W. K. U. R. M. K. P. K. Samarakoon, and Ashan Senel Asmone. "Tile Delamination on Façades of Tall Buildings." Buildings 15, no. 7 (2025): 1054. https://doi.org/10.3390/buildings15071054.

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Tile delamination on the façades of tall buildings poses significant concerns for public safety worldwide. This study investigates the underlying causes of tile delamination and their linkages with other prevalent façade defects in order to develop a risk assessment for preventing future tile delamination in tall buildings. Drawing on Singapore’s experience, data were gathered from case studies through field inspections and expert interviews. The results have been supported by data findings and past laboratory testing conducted in the Singaporean context. The findings indicate that the main ca

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Chang, Fu-Kuo, and Zafer Kutlu. "Delamination Effects on Composite Shells." Journal of Engineering Materials and Technology 112, no. 3 (1990): 336–40. http://dx.doi.org/10.1115/1.2903334.

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An analytical investigation was performed to study the effect of delamination on the response of cylindrical composite shells subjected to external loadings. It was of particular interest to determine the buckling load and the post-buckling behavior of externally pressurized cylindrical composite shells containing delaminations. An analytical model was developed that consists of a structural analysis for calculating the global deformations of the structures and a fracture analysis for determining the delamination growth in the structures. A nonlinear finite element code based on the updated La

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Erives, R., B. F. Sørensen, S. S. Samareh-Mousavi, et al. "Design of an element test specimen for fatigue delamination growth of a thick laminate." IOP Conference Series: Materials Science and Engineering 1293, no. 1 (2023): 012017. http://dx.doi.org/10.1088/1757-899x/1293/1/012017.

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Abstract Following the observation of multiple delaminations growing from a tunnelling crack in the spar cap of a wind turbine rotor blade subjected to cyclic loading, an element test specimen is proposed. Design of the element test specimen to study fatigue delamination of a thick laminate is presented. Complexities inherent to a full structure e.g., curvatures, ply drops, manufacturing defects, etc. are removed to study the fatigue delamination damage mechanism. The element test specimen is made of unidirectional layers with two embedded artificial delamination cracks connected by a tunnelli

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Fuoss, E., P. V. Straznicky, and C. Poon. "Prediction of Impact-Induced Delamination in Composite Plates." Advanced Composites Letters 3, no. 6 (1994): 096369359400300. http://dx.doi.org/10.1177/096369359400300602.

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The bending stiffness mismatch method is examined for its ability to predict delaminations within multi-ply composite plates. Bending stiffness is found to be insufficient to predict delamination size through thickness. A combination of several parameters may be required to model delaminations resulting from an impact response.

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Heberger, L., S. Nissle, M. Gurka, B. Kirsch, and J. C. Aurich. "Qualitätssteigerung von Bohrungen in Faserkunststoffverbunden*/Increased quality of bores in fiber reinforced polymers." wt Werkstattstechnik online 105, no. 07-08 (2015): 501–7. http://dx.doi.org/10.37544/1436-4980-2015-07-08-59.

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Beim Bohren von kohlefaserverstärktem Kunststoff treten verstärkt Schädigungen wie Delaminationen und Faserüberstände auf. Mit dem Ziel die Bohrlochqualität zu verbessern, wurde der Einfluss der Werkstückeinspannung hinsichtlich Einspanngeometrie, -kraft und -material untersucht. Zusätzlich zur konventionellen optischen Delaminationsmessung wurde die äußere und die innere Delamination mittels Mikrocomputertomografie analysiert. Durch eine Optimierung der Einspannung konnte die Bohrlochqualität gesteigert werden. &nbsp; When drilling carbon fiber reinforced polymers damages like delaminatio

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Sellitto, Andrea, R. Borrelli, Francesco Caputo, Aniello Riccio, and Francesco Scaramuzzino. "Application of the Mesh Superposition Technique to the Study of Delaminations in Composites Thin Plates." Key Engineering Materials 525-526 (November 2012): 533–36. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.533.

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Laminated composite structures are increasingly finding more applications in various fields thanks to their lower weight if compared with other materials of the same strength. Nevertheless, composites thin plates show a critical behavior in terms of damage propagation mechanisms when subjected to (low velocity) impact. Indeed they tend to produce delaminations which can be hardly detected by optical inspections and can affect the global load carrying capability, leading to a premature structural collapse. The aim of this paper is to assess the capabilities of the Davies-Zhang approach (introdu

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Subba Rao, V. V., Godavarthi Yeswanth Kiran Kumar, and Sansanka Pentapalli. "Reduction of AWJ Induced Delaminations by Impregnated Nanoclay GFRP Composites." Materials Science Forum 969 (August 2019): 284–90. http://dx.doi.org/10.4028/www.scientific.net/msf.969.284.

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Composite materials are extensively used in various applications like space, aircraft, and automobile sector because of superior physical and mechanical properties even though they are costly. In recent technological innovations, using Montmorillonite (Nanoclay) to reinforce polymer-based composites has raised attention to academic and industrial sectors since small addition could enhance Mechanical properties thereby decreasing failures like delaminations. In present research work, the effect of AWJ machining parameters on delaminations of glass fibre reinforced epoxy composite is investigate

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Kay, R. W., and S. Mahlburg Kay. "Delamination and delamination magmatism." Tectonophysics 219, no. 1-3 (1993): 177–89. http://dx.doi.org/10.1016/0040-1951(93)90295-u.

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Papanaboina, Mastan Raja, Elena Jasiuniene, Vykintas Samaitis, Liudas Mažeika, and Paulius Griškevičius. "Delamination Localization in Multilayered CFRP Panel Based on Reconstruction of Guided Wave Modes." Applied Sciences 13, no. 17 (2023): 9687. http://dx.doi.org/10.3390/app13179687.

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Multi-layered composite materials are being used in various engineering fields, such as aerospace, automobile, and wind energy, because of their superior material properties. Due to various impact loads during the service life of composite structures, different types of defects can occur, such as matrix cracking, fiber breakage, delaminations, etc. In this research, a novel SHM technique for delamination detection and localization using a minimum number of sensors is proposed. The analytical, numerical, and experimental analysis of GW was performed to increase the probability of detection and

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Karim, M. R., T. Kundu, and C. S. Desai. "Detection of Delamination Cracks in Layered Fiber-Reinforced Composite Plates." Journal of Pressure Vessel Technology 111, no. 2 (1989): 165–71. http://dx.doi.org/10.1115/1.3265653.

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In this paper, the dynamic response of delamination cracks in a layered fiber-reinforced composite plate is analytically studied. The plate is subjected to an antiplane loading and its surface response is computed in absence as well as in presence of delaminatioin cracks. To what extent the surface response is influenced by the presence of internal delamination cracks is investigated here. This study is important for nondestructive evaluation of internal damage in composites due to delamination. The problem is formulated in terms of integral equations in frequency domain. These equations are t

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Erdelyi, Nicholas H., and Seyed M. Hashemi. "On the Finite Element Free Vibration Analysis of Delaminated Layered Beams: A New Assembly Technique." Shock and Vibration 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/3707658.

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The dynamic analysis of flexible delaminated layered beams is revisited. Exploiting Boolean vectors, a novel assembly scheme is developed which can be used to enforce the continuity requirements at the edges of delamination region, leading to a delamination stiffness term. The proposed assembly technique can be used to form various beam configurations with through-width delaminations, irrespective of the formulation used to model each beam segment. The proposed assembly system and the Galerkin Finite Element Method (FEM) formulation are subsequently used to investigate the natural frequencies

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Gillespie, David I., Andrew W. Hamilton, Robert C. Atkinson, et al. "Composite Laminate Delamination Detection Using Transient Thermal Conduction Profiles and Machine Learning Based Data Analysis." Sensors 20, no. 24 (2020): 7227. http://dx.doi.org/10.3390/s20247227.

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Delaminations within aerospace composites are of particular concern, presenting within composite laminate structures without visible surface indications. Transmission based thermography techniques using contact temperature sensors and surface mounted heat sources are able to detect reductions in thermal conductivity and in turn impact damage and large disbonds can be detected. However delaminations between Carbon Fibre Reinforced Polymer (CFRP) plies are not immediately discoverable using the technique. The use of transient thermal conduction profiles induced from zonal heating of a CFRP lamin

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Giannakopoulos, A. E., K. F. Nilsson, and G. Tsamasphyros. "The Contact Problem at Delamination." Journal of Applied Mechanics 62, no. 4 (1995): 989–96. http://dx.doi.org/10.1115/1.2896034.

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The important phenomenon of delamination buckling is examined subjected to the condition of frictionless contact. Buckled delamination is examined in particular, because in-plane compressive loading is typical and detrimental. Two types of contact can be distinguished, local and global. The latter may occur everywhere in the plate while the local contact is limited to the crack front (negative KI stress intensity factors). Both local and global contact conditions were considered using a finite element scheme which employed nonlinear plate theory. The global contact problem is formulated as it

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Tumšys, Olgirdas, Lina Draudvilienė, and Egidijus Žukauskas. "Detailed Determination of Delamination Parameters in a Multilayer Structure Using Asymmetric Lamb Wave Mode." Sensors 25, no. 2 (2025): 539. https://doi.org/10.3390/s25020539.

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A signal-processing algorithm for the detailed determination of delamination in multilayer structures is proposed in this work. The algorithm is based on calculating the phase velocity of the Lamb wave A0 mode and estimating this velocity dispersion. Both simulation and experimental studies were conducted to validate the proposed technique. The delamination having a diameter of 81 mm on the segment of a wind turbine blade (WTB) was used for verification of the proposed technique. Four cases were used in the simulation study: defect-free, delamination between the first and second layers, delami

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Tay, TE. "Characterization and analysis of delamination fracture in composites: An overview of developments from 1990 to 2001." Applied Mechanics Reviews 56, no. 1 (2003): 1–32. http://dx.doi.org/10.1115/1.1504848.

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Delamination is a major failure mode in laminated composites and has received much research attention. A huge amount of literature has been published on this subject, resulting in considerable improvement in our understanding of delamination behavior. A rather comprehensive review paper was published by Garg in 1988. That paper contains 136 references from 1971 to 1988, a period spanning roughly two decades. A more recent survey by Pagano and Schoeppner contains critical reviews of many selected papers, especially the pioneering works on delamination research. An overview of Russian and Soviet

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Shu, Dong Wei. "Vibration of Beams with a Single Delamination under Axial Loading." Materials Science Forum 675-677 (February 2011): 477–80. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.477.

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In this work analytical solutions are developed to study the free vibration of composite beams under axial loading. The beam with a single delamination is modeled as four interconnected Euler-Bernoulli beams using the delamination as their boundary. The continuity and the equilibrium conditions are satisfied between the adjoining beams. The studies show that the sizes and the locations of the delaminations significantly influence the natural frequencies and mode shapes of the beam. A monotonic relation between the natural frequency and the axial load is predicted.

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Craven, R., L. Iannucci, and R. Olsson. "Delamination buckling: A finite element study with realistic delamination shapes, multiple delaminations and fibre fracture cracks." Composites Part A: Applied Science and Manufacturing 41, no. 5 (2010): 684–92. http://dx.doi.org/10.1016/j.compositesa.2010.01.019.

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Pascoe, J. A., C. D. Rans, and R. Benedictus. "Characterizing fatigue delamination growth behaviour using specimens with multiple delaminations: The effect of unequal delamination lengths." Engineering Fracture Mechanics 109 (September 2013): 150–60. http://dx.doi.org/10.1016/j.engfracmech.2013.05.015.

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He, Yu Ting, Hong Peng Li, Rong Hong Cui, and Chao Hua Fan. "Influence of Delamination of Epoxy/Dielectric Interfaces on Pattern Shift and Passivation Cracking under Aeronautical Conditions." Materials Science Forum 575-578 (April 2008): 919–23. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.919.

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Interfacial delamination is a recognized failure mode in Integrated circuits (ICs). A major cause for this failure is the mismatch of Thermal Expansion Coefficients, Young’s modulus, and Poisson’s ratios of the package materials. Here, the influence of delamination between epoxy and dielectric layers on pattern shift and passivation cracking in IC package under aeronautical conditions, mainly temperature and load cycles, is studied by maximum plastic strain and maximum principal stresses theory using a certain 2D FEM model with different delamination length “L_c.right”. Delaminations are easy

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Castaldo, Rossana, Angela Russo, Mauro Zarrelli, Cinzia Toscano, and Aniello Riccio. "Unstable Delamination Growth in Stiffened Composite Panels Under Cyclic Loading Conditions." Polymers 16, no. 22 (2024): 3118. http://dx.doi.org/10.3390/polym16223118.

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Aeronautical structures can be damaged by objects during operation and maintenance. Indeed, foreign object impacts (FOIs) affect the overall performance of composite structural components. Delamination is the most critical damage mechanism as it is undetectable and develops silently. This phenomenon can be worsened by cyclic loading, as residual strength and stiffness can decrease rapidly, potentially leading to collapse. Unstable delamination growth is critical because it can occur without an increase in the applied load, threatening the integrity of the structure. Predicting this behaviour u

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Wu, D., and S. S. Law. "Delamination Detection-Oriented Finite Element Model for a Fiber Reinforced Polymer Bonded Concrete Plate and Its Application With Vibration Measurements." Journal of Applied Mechanics 74, no. 2 (2006): 240–48. http://dx.doi.org/10.1115/1.2190228.

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Delamination is a common type of damage in laminated fiber-reinforced polymer (FRP) composites. As FRP composites are becoming popular in upgrading and strengthening of civil concrete structures, the specific delamination damage, i.e., the FRP-concrete debonding, is considered more critical than inter-laminar delamination occurring in the FRP composites. A finite element formulation on the FRP-bonded concrete plate with this type of delamination fault is developed in the context of non-destructive evaluation from vibration measurements and compared with a two-layer solid element model. An adhe

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Xu, Changhang, Jing Xie, Changwei Wu, Lemei Gao, Guoming Chen, and Gangbing Song. "Enhancing the Visibility of Delamination during Pulsed Thermography of Carbon Fiber-Reinforced Plates Using a Stacked Autoencoder." Sensors 18, no. 9 (2018): 2809. http://dx.doi.org/10.3390/s18092809.

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The effectiveness of pulsed thermography (PT) for detecting delamination in carbon fiber-reinforced polymer (CFRP) plates has been widely verified. However, delaminations are usually characterized by weak visibility due to the influences of inspection factors and the delaminations with weak visibility are easily missed in real inspections. In this study, by introducing a deep learning algorithm—stacked autoencoder (SAE)—to PT, we propose a novel approach (SAE-PT) to enhance the visibility of delaminations. Based on the ability of SAE to learn unsupervised features from data, the thermal featur

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Matalgah, Khaled, Pruthul Kokkada Ravindranath, Daniel Pulipati, and Trevor J. Fleck. "Automated Quantification of Interlaminar Delaminations in Carbon-Fiber-Reinforced Polymers via High-Resolution Ultrasonic Testing." Polymers 15, no. 24 (2023): 4691. http://dx.doi.org/10.3390/polym15244691.

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This article presents a method of ultrasonic testing (UT) that detects and quantifies interlaminar delaminations in CFRP composites with high resolution in terms of both spatial resolution in the planar dimension and depth into the laminate. Unidirectional and woven CFRP laminates were fabricated for this study, with a PTFE film inserted at various depths throughout the laminate to act as intentional crack initiation sites. All samples were mechanically tested via a three-point, end-notched flexure (ENF) test, followed by a quantification of the extent of the induced interlaminar delaminations

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Nanda, Namita. "Spectral finite element method for wave propagation analysis in smart composite beams containing delamination." Aircraft Engineering and Aerospace Technology 92, no. 3 (2020): 440–51. http://dx.doi.org/10.1108/aeat-02-2019-0026.

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Purpose The purpose of the study is to present a frequency domain spectral finite element model (SFEM) based on fast Fourier transform (FFT) for wave propagation analysis of smart laminated composite beams with embedded delamination. For generating and sensing high-frequency elastic waves in composite beams, piezoelectric materials such as lead zirconate titanate (PZT) are used because they can act as both actuators and sensors. The present model is used to investigate the effects of parametric variation of delamination configuration on the propagation of fundamental anti-symmetric wave mode i

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