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Journal articles on the topic 'Composite materials Delamination'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

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 (July 27, 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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2

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 (September 1, 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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3

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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Hajikhani, Milad, Amir Refahi Oskouei, Mehdi Ahmadi Najaf Abadi, Amir Sharifi, and Mohammad Heidari. "Progressive Fracture Evaluation in Composite Materials by Acoustic Emission Technique." Key Engineering Materials 465 (January 2011): 535–38. http://dx.doi.org/10.4028/www.scientific.net/kem.465.535.

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Glass/polyester and glass/epoxy laminated composites widely used in structures and have very near properties. These composite laminates have poor inter-laminar fracture resistance and suffer extensive damage by delamination cracking when subjected to out of plane loading and hence are vulnerable to delamination. The presence of delamination in the composite material may reduce the overall stiffness. Structural design and nondestructive test techniques have evolved as increased emphasis has been placed on the durability and damage tolerance of these materials. There are several methods used to

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5

Chang, Fu-Kuo, and Zafer Kutlu. "Delamination Effects on Composite Shells." Journal of Engineering Materials and Technology 112, no. 3 (July 1, 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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6

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 (December 27, 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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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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8

Wei, Z., L. H. Yam, and L. Cheng. "Delamination Assessment of Multilayer Composite Plates Using Model-based Neural Networks." Journal of Vibration and Control 11, no. 5 (May 2005): 607–25. http://dx.doi.org/10.1177/1077546305052317.

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A procedure for damage detection in multilayer composites is described using model-based neural networks and vibration response measurement. The appropriate finite element model is established to generate the training data of neural networks. Internal delaminations with different sizes and locations are considered as the particular damage scenarios in multilayer composite plates. The damage-induced energy variation of response signal is investigated, and the mechanism of mode-dependent energy dissipation of composite plates due to delamination is revealed. In order to obtain the structural dyn

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9

Marshall, I. H. "Delamination Buckling of Composite Materials." Composite Structures 13, no. 3 (January 1989): 235–36. http://dx.doi.org/10.1016/0263-8223(89)90007-x.

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10

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 (June 19, 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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Muc, Aleksander. "Buckling of Composite Structures with Delaminations—Laminates and Functionally Graded Materials." Applied Sciences 12, no. 22 (November 10, 2022): 11408. http://dx.doi.org/10.3390/app122211408.

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In the present paper, buckling problems of constructions with single delamination are examined. Structures were made of unidirectional laminates and functionally graded materials (FGM). Two types of delaminations (closed and opened) were both investigated in experiments both in rectangular plates and axi-symmetric shells. The first part of the work is devoted to the formulation of contact problems (embedded, closed delaminations) with the aid of various functional inequalities. Then, computational models are discussed. To study the influence of the variable material configuration of FGMs, the

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12

János, Líska, and Kodácsy János. "Drilling of Glass Fibre Reinforced Plastic." Advanced Materials Research 472-475 (February 2012): 958–61. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.958.

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Nowadays composite materials are used in many industrial areas. The main application of these is the aircraft industry. Problematic points with machining of composite materials are tool wear, tool life, delamination and temperature during machining of polymer composite materials. Paper focuses on investigation of delamination at drilling of glass fibre reinforced composites. Experiments were planned on the base so called design of experiment - DOE. We observed the evolution of delamination at investigations, when we combined 4 different variables (vc, fz, tool, cooling system). We investigated

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13

Tian, Xinpeng, Dong Yao, and Qun Li. "Thermal buckling response and fracture analysis for delaminated fiber reinforced composite plates under thermo-mechanical coupling." Journal of Composite Materials 52, no. 27 (May 2, 2018): 3715–30. http://dx.doi.org/10.1177/0021998318769132.

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Fiber reinforced composites are often subjected to severe thermal-mechanical coupling loads. In order to predict the stiffness and strength of the designed composites, thermal buckling response of the delaminated fiber reinforced composite plates and fracture analysis along the delamination front under thermo-mechanical coupling are investigated based on the generalized layerwise plate theory. Delamination between individual layers is considered as discontinuities in the displacement field using Heaviside step functions in the finite element model of delaminated composite plates. Governing equ

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14

Sudha J., A., B. Sampathkumar S., and C. Vijaya A. "AE Waveform Analysis of Delamination in GFRP Composite Materials during Drilling." International Journal of Engineering and Technology 1, no. 1 (2009): 63–66. http://dx.doi.org/10.7763/ijet.2009.v1.11.

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15

Sabău, Emilia, Cristian Vilău, Paul Bere, and Adrian Popescu. "Finite element simulation of delamination process in composite materials." MATEC Web of Conferences 299 (2019): 06003. http://dx.doi.org/10.1051/matecconf/201929906003.

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The delamination phenomenon is undesirable and constitutes a major problem. In this paper, a study of delamination for composite materials reinforced with unidirectional glass fibers in polyester matrix is analyzed. The composite plates were made using two manufacturing technologies, hand lay-up and compression hand lay-up process. The study found out the maximum value of the force where delamination occurs and the specific delamination resistance. Also, it’s done a finite element simulation of delamination process at polymeric composite materials under transverse loads. The propagation model

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16

Sellitto, Andrea, Aniello Riccio, A. Russo, Antonio Garofano, and Mauro Zarrelli. "Nanofillers’ Effects on Fracture Energy in Composite Aerospace Structures." Key Engineering Materials 827 (December 2019): 43–48. http://dx.doi.org/10.4028/www.scientific.net/kem.827.43.

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Composite materials damage behaviour is, nowadays, extensively investigated in the frame of aerospace research programmes. Among the several failure mechanisms which can affect composites, delamination can be considered as the most critical one, especially when combined to compressive loading conditions. In this context, nanofillers can represent an effective way to increase the composites fracture toughness with a consequent reduction of the delamination onset and evolution. Hence, in this paper, the toughening effect of the nanofillers on the delamination growth in composite material panels,

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17

Aveiga, David, and Marcelo L. Ribeiro. "A Delamination Propagation Model for Fiber Reinforced Laminated Composite Materials." Mathematical Problems in Engineering 2018 (June 19, 2018): 1–9. http://dx.doi.org/10.1155/2018/1861268.

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The employment of composite materials in the aerospace industry has been gradually considered due to the fundamental lightweight and strength characteristics that this type of materials has. The science material and technological progress reached matched perfectly with the requirements for high-performance materials in aircraft and aerospace structures; thus, the development of primary structure elements applying composite materials became something very convenient. It is extremely important to pay attention to the failure modes that influence composite materials performances, since these fail

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18

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 (May 1, 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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19

Ramadhan, Redha Akbar, Muhamad Giri Suada, and Hendri Syamsudin. "A FINITE ELEMENT ANALYSIS OF CRITICAL BUCKLING LOAD OF COMPOSITE PLATE AFTER LOW VELOCITY IMPACT." Jurnal Teknologi Dirgantara 18, no. 2 (December 27, 2020): 195. http://dx.doi.org/10.30536/j.jtd.2020.v18.a3328.

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Composite is a material formed from two or more materials that macroscopically alloyed into one material. Nowadays, composite has been generally applied as lightweight structure of aircraft. This is due to the fact that composites having high strength-to-weight ratio. It means the composites have the capability to take on various loads, despite their lightweight property.Laminate composite is one type of composite that has been generally used in aircraft industries. This type of composite is susceptible to low-velocity impact induced damage. This type of damage can be happening in manufacture,

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20

Azuan, S. A. Syed, J. M. Juraidi, and Wan Mansor Wan Muhamad. "Evaluation of Delamination in Drilling Rice Husk Reinforced Polyester Composites." Applied Mechanics and Materials 232 (November 2012): 106–10. http://dx.doi.org/10.4028/www.scientific.net/amm.232.106.

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Delamination is recognized as one of the most critical defects that can result from the machining composites. Delamination has been a major form of failure in drilled composite materials due to the composites lack of strength in the drilling direction, which results in poor surface finish, reduction in bearing strength, reduction in structural integrity and ultimately poor performance of the composite. Currently, most of the major research reported delamination address specific of machining fiber glass, graphite fiber or carbon fiber reinforced polymer composites. It is not yet clear how diffe

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21

Tay, TE. "Characterization and analysis of delamination fracture in composites: An overview of developments from 1990 to 2001." Applied Mechanics Reviews 56, no. 1 (January 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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22

Wang, Xu, Yan Li He, and Jing Yi Wang. "A Delamination Factor Prediction Model for Drilling of Composite Materials." Advanced Materials Research 601 (December 2012): 41–45. http://dx.doi.org/10.4028/www.scientific.net/amr.601.41.

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In this paper，according to the shell theory , model are developed to predict delamination damage in the drilling process. Finally, we will get theoretical delamination factor and complete the prediction of the delamination damage area. The known references didn’t find similar model of predicting delamination damage. Therefore, it is new method. With the drilling process experimental contrast，the model is more effective for the prediction of delamination of the carbon fiber composite materials.

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23

Patel, Kamal S., and G. D. Ramtekkar. "Analysis of interlaminar stress concentration in laminated structure - A review." IOP Conference Series: Earth and Environmental Science 982, no. 1 (March 1, 2022): 012080. http://dx.doi.org/10.1088/1755-1315/982/1/012080.

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Abstract Composite materials are popular in the specialised construction industry, whether aviation or car industry or civil structures. Laminated composite is one of the prevalent forms. Analysis and design of laminated composite is the focus of the study. To obtain a better design of the laminated composite, understanding its behaviour properly is very important. Delamination is the critical phenomenon in the laminated composite plates and shell, which causes the failure. Delamination studies can be categorised into two parts: the onset of delamination and the second is the failure progressi

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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 (September 1, 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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Bijjam, Ramgopal Reddy, Srinivas Chandanam, Govind Nandipati, and Sneha H. Dhoria. "Optimization of Machining Parameters in Drilling of Glass/Hemp/Bamboo Fibres Based Hybrid Polymer Composites." Annales de Chimie - Science des Matériaux 46, no. 3 (June 30, 2022): 127–33. http://dx.doi.org/10.18280/acsm.460303.

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Significance of composite materials is increasing enormously in the progress of modern science and technology. The composites can be transformed into suitable components with high precision by machining, which can be used for present day applications. Drilling is crucial operation that is often used in the assembly of composite parts to obtain finished product. But the drilling induced damage may affect the performance of the composite. The present work is focused on the impact of various parameters in drilling like feed rate, spindle speed and drill diameter on surface roughness and delaminat

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Motamedi, Damoon, Mahdi Takaffoli, and Abbas S. Milani. "Nonlinear XFEM Modeling of Mode II Delamination in PPS/Glass Unidirectional Composites with Uncertain Fracture Properties." Materials 13, no. 16 (August 12, 2020): 3548. http://dx.doi.org/10.3390/ma13163548.

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Initiation and propagation of cracks in composite materials can severely affect their global mechanical properties. Due to the lower strength of the interlaminar bonding compared to fibers and the matrix, delamination between plies is known to be one of the most common failure modes in these materials. It is therefore deemed necessary to gain more insight into this type of failure to guide the design of composite structures towards ensuring their robustness and reliability during service. In this work, delamination of interlaminar bonding in composite end-notched flexure (ENF) samples was mode

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Balaji, N. S., S. Jayabal, S. Kalyana Sundaram, S. Rajamuneeswaran, and P. Suresh. "Delamination Analysis in Drilling of Coir-Polyester Composites Using Design of Experiments." Advanced Materials Research 984-985 (July 2014): 185–93. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.185.

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Drilling of fiber reinforced composite materials presents a plethora of questions to the engineers and scientists. A number of research endeavors have been made in the recent years to fully characterize the drilling process of fiber reinforced composite materials. The efforts have been made in the direction of optimization of the operating variables and conditions for minimizing the drilling induced damages. This paper presented the delamination analysis of drilled holes in coir fiber-reinforced polyester composites. The results indicated that the delamination factor in coir fiber-reinforced c

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Balasubramanian, M., and S. Madhu. "Evaluation of delamination damage in carbon epoxy composites under swirling abrasives made by modified internal threaded nozzle." Journal of Composite Materials 53, no. 6 (August 8, 2018): 819–33. http://dx.doi.org/10.1177/0021998318791340.

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Carbon fibre-reinforced polymer composites are finding increased applications in the field of automotive manufacture and aircraft industries due to their appreciative combination of high strength and low weight. The machining of these composites with economically viable and high part qualities requires enhancement in machining strategies. Delamination and surface roughness are the undesirable geometrical defects inherent in abrasive jet machining of layered polymer composites. This investigation focuses on the mechanism of delamination and surface roughness in abrasive jet machining of carbon

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NAGASHIMA, TOSHIO, and HIROSHI SUEMASU. "STRESS ANALYSES OF COMPOSITE LAMINATE WITH DELAMINATION USING X-FEM." International Journal of Computational Methods 03, no. 04 (December 2006): 521–43. http://dx.doi.org/10.1142/s0219876206001181.

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The extended finite element method (X-FEM) is applied to the stress analysis of composite laminates having interlaminar planar delamination. In X-FEM analysis, the geometry of such delaminations can be modeled independent of the finite elements. The domain form of the contour integral can be used to compute the energy release rate in conjunction with X-FEM. As numerical examples, three-dimensional analyses for DCB and ENF test specimens were performed by X-FEM with various enrichment nodes, and the obtained results were examined. In addition, a model of the no-friction-contact condition by X-F

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Sun, Shi Yong, Zi Bin Yan, and Rui Yang. "Numerical Study on the Delamination Onset in Drilling Composite Materials." Advanced Materials Research 472-475 (February 2012): 2256–59. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.2256.

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The theoretical analysis and numerical study focused on the delamination onset of composites in drilling are presented. An analytical model considering the form of loads distribution is built. The formulas based on the fracture mechanics theory are given for predicting the critical drilling force of delamination onset. A finite element model is used to simulate the process of interfacial crack growth between layers. The interface elements are employed to account for delamination based on cohesive zone model. Some numerical results are given for verifying the validity of the distribution loadin

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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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Lee, C. M., K. S. Jeon, B. G. Jung, Y. M. Lee, and M. W. Kang. "Prediction and measurement of acoustic transmission loss of acoustic window with composite sandwich structure." Noise Control Engineering Journal 69, no. 5 (September 1, 2021): 422–30. http://dx.doi.org/10.3397/1/376939.

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Underwater acoustic detection sensors are mounted on the outside of the submarine; the acoustic window for protecting these sensors must be structurally robust while also minimizing any deterioration of sensor's sound detection performance. These two conditions are typically satisfied simultaneously by using composite materials with acoustic window materials. However, since such composite material is manufactured by laminating fibers, there is the probability that delamination occurs, in which an air layer is formed inside, due to manufacturing process errors. Delamination inside the acoustic

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Liu, Peng-fei, Jun Yang, and Xiong-qi Peng. "Delamination analysis of carbon fiber composites under hygrothermal environment using acoustic emission." Journal of Composite Materials 51, no. 11 (August 10, 2016): 1557–71. http://dx.doi.org/10.1177/0021998316661043.

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Non-destructive test technique for monitoring delamination failure under complex load and environments is still not mature until now. The purpose of this paper is to study mixed-mode delamination failure properties of carbon fiber/epoxy composite laminates under hygrothermal environment using acoustic emission. Different water-saturated composite specimens with initial intralaminar and interlaminar defects are tested. Two loading modes including single-leg and over-leg three-point bending are applied under hygrothermal environment. By analyzing the responses of acoustic emission parameters inc

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Rahme, P., Y. Landon, F. Lachaud, R. Piquet, and P. Lagarrigue. "Delamination-free drilling of thick composite materials." Composites Part A: Applied Science and Manufacturing 72 (May 2015): 148–59. http://dx.doi.org/10.1016/j.compositesa.2015.02.008.

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Thouless, M. D., H. C. Cao, and P. A. Mataga. "Delamination from surface cracks in composite materials." Journal of Materials Science 24, no. 4 (April 1989): 1406–12. http://dx.doi.org/10.1007/bf02397080.

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Thouless, M. D., H. C. Cao, and P. A. Mataga. "Delamination from surface cracks in composite materials." Journal of Materials Science 24, no. 4 (April 1989): 1406–12. http://dx.doi.org/10.1007/pl00020229.

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Song, Yuan Jia, Wei Zhang, Dong Dong Wang, and Guo Feng Jin. "Research of Detectivity for Ultrasonic Infrared Thermography NDT in Composite Materials." Applied Mechanics and Materials 148-149 (December 2011): 914–18. http://dx.doi.org/10.4028/www.scientific.net/amm.148-149.914.

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In this paper, the ultrasonic infrared thermography (UIT) technique was applied to detect the composites damage. The frictional heating and thermal conductivity at the location of crack of the composites under ultrasonic excitation was simulated by finite element method (FEM). The excitation parameters including time, amplitude and frequency were studied. The composite involving delamination was detected by the ultrasonic generator. The results show that the UIT can identify the contacting interface-type damages at the surface or subsurface of composites rapidly, for example, delamination, fat

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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 (August 27, 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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Prakash, M., and PVS Dileep Aditya Dhar. "Investigation on the effect of drilling parameters on the tool wear and delamination of glass fibre-reinforced polymer composite using vibration signal analysis." Journal of Composite Materials 52, no. 12 (August 29, 2017): 1641–48. http://dx.doi.org/10.1177/0021998317728109.

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Glass fibre-reinforced polymer composite materials are widely used in industrial, aerospace and automotive sector. It has excellent properties such as high strength to weight ratio, higher fatigue limit, high stiffness to weight ratio, corrosion resistance and design flexibility. The strength of the composite highly depends upon orientation of the fibre material. Drilling is one of the major machining operations that are carried out on Glass fibre-reinforced polymer composite materials to the need for components assembly. There are many problems encountered while drilling glass fibre-reinforce

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Ho-Cheng, H., and C. K. H. Dharan. "Delamination During Drilling in Composite Laminates." Journal of Engineering for Industry 112, no. 3 (August 1, 1990): 236–39. http://dx.doi.org/10.1115/1.2899580.

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Delamination is the major concern during drilling of composite laminates. Delamination, in addition to reducing the structural integrity of the laminate, also results in poor assembly tolerance and has the potential for long-term performance deterioration. Drilling-induced delamination occurs both at the entrance and at the exit planes. This paper presents an analysis of delamination during drilling. The analysis uses a fracture mechanics approach in which the opening-mode delamination fracture toughness, a material parameter, is used with a plate model of the laminate. The analysis predicts a

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Wu, Cui Qin, Wei Ping Wang, Qi Gang Yuan, Yan Jun Li, Wei Zhang, and Xiang Dong Zhang. "Infrared Thermography Non-Destructive Testing of Composite Materials." Advanced Materials Research 291-294 (July 2011): 1307–10. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1307.

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To detect the delamination, disbond，inclusion defects of the glass fiber composite materials applied in the solid rocket motor, active infrared thermographic non-destructive testing(NDT) is researched. The samples including known defects are heated by pulsed high energy flash lamp. The surface temperature of the samples is monitored by infrared thermography camera. The results of the experiments show that the active infrared thermography technique is a fast and effective inspection method for detecting the defects of delamination, disbond，inclusion of the composites. The samples are also detec

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Tsao, Chung Chen, Kei Lin Kuo, I. Chien Hsu, and G. T. Chern. "Analysis of Core-Candlestick Drill in Drilling Composite Materials." Key Engineering Materials 419-420 (October 2009): 337–40. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.337.

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Unlike ductile metals cutting mechanism, the interfaces between fiber and matrix as a transitional layer experience mismatched deformation in machining process. In general, the most frequent operation performed on composite materials is drilling with a twist drill to generate a hole owing to their versatility and low production cost. However, delamination is one of the most common defects in drilling laminated fiber-reinforced composites and can cause a significant reduction in the load-carrying capacity of a structure. At the periphery, using such special drills as saw drill, candlestick dril

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Shen, Yiou, Jiayi Tan, Luis Fernandes, Zehua Qu, and Yan Li. "Dynamic Mechanical Analysis on Delaminated Flax Fiber Reinforced Composites." Materials 12, no. 16 (August 11, 2019): 2559. http://dx.doi.org/10.3390/ma12162559.

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It is well-known that the presence of the delamination in a plant fiber-reinforced composite is difficult to detect. However, the delamination introduces a local flexibility, which changes the dynamic characteristics of the composite structure. This paper presents a new methodology for composite laminate delamination detection, which is based on dynamic mechanical analysis. A noticeable delamination-induced storage modulus reduction and loss factor enhancement have been observed when the delaminated laminate was subjected to a forced oscillation compared to the intact composite laminate. For d

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Riccio, Aniello, Angela Russo, Andrea Sellitto, Cinzia Toscano, Davide Alfano, and Mauro Zarrelli. "Experimental and Numerical Assessment of Fibre Bridging Toughening Effects on the Compressive Behaviour of Delaminated Composite Plates." Polymers 12, no. 3 (March 3, 2020): 554. http://dx.doi.org/10.3390/polym12030554.

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Increasing the Mode I inter-laminar fracture toughness of composite laminates can contribute to slowing down delamination growth phenomena, which can be considered one of the most critical damage mechanisms in composite structures. Actually, the Mode I interlaminar fracture toughness (GIc) in fibre-reinforced composite materials has been found to considerably increase with the crack length when the fibre bridging phenomenon takes place. Hence, in this paper, the fibre bridging phenomenon has been considered as a natural toughening mechanism able to replace embedded metallic or composite reinfo

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Nagarajan, VA, S. Sundaram, K. Thyagarajan, J. Selwin Rajadurai, and TPD Rajan. "Refined delamination characterization for composite laminates using digital means." Journal of Composite Materials 46, no. 13 (October 6, 2011): 1535–47. http://dx.doi.org/10.1177/0021998311421042.

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Drilling is most widely applied to composite materials; nevertheless, the damage induced by this operation on composite materials may reduce drastically the component performance. In order to establish the damage level, delamination is measured quantitatively using digital means. A comparison between the conventional ( FD) and adjusted ( FDA) delamination factor is presented. In order to quantify the delamination effectively, ‘a refined delamination factor ( FDR)’ is proposed. The accuracy of the proposed criteria is validated using experimental results.

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Teng, Hsing Ming, Ming Chang Wu, Jin Yi Kao, Chun Yao Hsu, and Chung Chen Tsao. "The Effect of Thrust Force in Drilling Composite Materials Using a New Step Core-Ball Drill." Key Engineering Materials 830 (February 2020): 77–84. http://dx.doi.org/10.4028/www.scientific.net/kem.830.77.

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Compared with conventional metal materials, composite materials can sustain more loads under lower weight and lower space, which is more suitable to use in high strength environment for structure parts application in aerospace, military, transportation and leisure. The enormous aeronautical components and structures of composite materials require assembly and machining. Drilling is the most important making-hole process in the final assembly. However, conventional drill cannot avoid delamination in drilling composite materials effectively depending on tool geometry only. Delamination caused by

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Pang, Yan Rong, Ya Juan Li, Ran Liu, Shuai Qi, Ru Yue Liu, and Wei Zhou. "Effect of Porosity on Mechanical Property and Acoustic Emission Signals of Composite Materials." Advanced Materials Research 912-914 (April 2014): 115–18. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.115.

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In order to achieve the effect of porosity on the mechanical property and acoustic emission (AE) signals of composite materials with mode I delamination, unidirectional tensile tests and real-time AE monitoring of high property and low property composites were conducted. The results show that the porosity of composite materials made a detrimental effect on the mechanical properties. As the load increases to an inflection point, the slope of the curve becomes smaller. And the slope of the high porosity specimen is lower than that of the other one. With the increase of the porosity of composite

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Marino, Salvatore Giacomo, Florian Mayer, Alexander Bismarck, and Gergely Czél. "Effect of Plasma-Treatment of Interleaved Thermoplastic Films on Delamination in Interlayer Fibre Hybrid Composite Laminates." Polymers 12, no. 12 (November 28, 2020): 2834. http://dx.doi.org/10.3390/polym12122834.

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Safe, light, and high-performance engineering structures may be generated by adopting composite materials with stable damage process (i.e., without catastrophic delamination). Interlayer hybrid composites may fail stably by suppressing catastrophic interlayer delamination. This paper provides a detailed analysis of delamination occurring in poly(acrylonitrile-butadiene-styrene) (ABS) or polystyrene (PS) film interleaved carbon-glass/epoxy hybrid composites. The ABS films toughened the interfaces of the hybrid laminates, generating materials with higher mode II interlaminar fracture toughness (

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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 (January 29, 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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Nayak, Bijaya Bijeta, Souranil Kundu, Sasmita Sahu, Sudesna Roy, and Shiv Sankar Das. "Support Vector Regression approach for prediction of delamination at entry and exit during drilling of GFRP Composites." E3S Web of Conferences 391 (2023): 01162. http://dx.doi.org/10.1051/e3sconf/202339101162.

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The demand for Composites in the modern era have increased immensely due to its vast applications and superior properties over conventional materials. Glass Fibre Reinforced Plastic (GFRP) is one of the economic alternative to conventional engineering materials due to its high specific modulus of elasticity, high specific strength, good corrosion resistance, high fatigue strength and lightweight. Components made out from GFRP composites are usually near net shaped and require holes for assembly integration. Drilling is an important process as concentrated forces can cause major damage to the c

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