Mode I interlaminar fracture of carbon/epoxy multidirectional laminates

Pereira, António B.; Morais, A.B. de

doi:10.1016/j.compscitech.2004.03.001

Cited by 139 publications

(81 citation statements)

References 21 publications

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“…Because of low strain energy required for the delamination initiation in mode I [7], this mode is the most critical mode of delamination and there are some conducted researches in literature regarding AE based condition monitoring of this mode [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Prediction of delamination growth in carbon/epoxy composites using a novel acoustic emission-based approach

Mohammadi

Saeedifar

Hosseini‐Toudeshky

et al. 2015

Journal of Reinforced Plastics and Composites

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Mohammadi, R., Saeedifar, M., Toudeshky, H. H., Najafabadi, M. A. and Fotouhi, M. (2015) Prediction of delamination growth in carbon/epoxy composites using a novel acoustic emission-based approach. Journal of Reinforced Plastics and Composites, 34 (11). pp. 868-878. ISSN 0731-6844 Available from: http://eprints.uwe.ac.uk/33481We recommend you cite the published version. The publisher's URL is: http://dx.doi.org/10.1177/0731684415583166Refereed: Yes (no note) Disclaimer UWE has obtained warranties from all depositors as to their title in the material deposited and as to their right to deposit such material. UWE makes no representation or warranties of commercial utility, title, or fitness for a particular purpose or any other warranty, express or implied in respect of any material deposited. UWE makes no representation that the use of the materials will not infringe any patent, copyright, trademark or other property or proprietary rights.UWE accepts no liability for any infringement of intellectual property rights in any material deposited but will remove such material from public view pending investigation in the event of an allegation of any such infringement. PLEASE SCROLL DOWN FOR TEXT. Acoustic Emission based interlaminar crack growth monitoring in Carbon/Epoxy Composites AbstractContinuous fiber-reinforced composites, such as those consisting of carbon fibers in an epoxy resin, offer an attractive potential for reducing the weight of high-performance structures. Delamination is the most common mode of failure in these laminated composites and it leads to loss of structural strength and stiffness. In this paper, in-situ Acoustic Emission (AE) monitoring are done on the carbon/epoxy laminated composites when subjected to mode I, mode II and mixed-mode I & II loading conditions. The main objective is to investigate delamination behavior and to predict propagation curve of the delamination in different G II /G T modal ratio values by AE.First, combination of AE and mechanical data (sentry function) is used to characterize propagation stage of the delamination. Next, crack tip location during propagation of the delamination is identified using two methods. In the first method, by determining velocity of the AE waves in the specimens and some filtration methods which are applied on the AE signals, position of the crack tip is determined at any time of the tests. In the second method, cumulative energy of the AE signals is utilized for localization of the crack tip. The relationship between the cumulative AE energy and crack growth is developed and presented based on the experimental data. Agreement between the predicted crack length and actual crack length verifies the presented procedures. It can be concluded from the results that AE method is a powerful approach

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Section: Introductionmentioning

confidence: 99%

Prediction of delamination growth in carbon/epoxy composites using a novel acoustic emission-based approach

Mohammadi

Saeedifar

Hosseini‐Toudeshky

et al. 2015

Journal of Reinforced Plastics and Composites

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“…Damage mechanisms such as fiber/matrix debonding and matrix cracking have been observed by SEM microscope (Figure 10a). The break of fiber bridges is observed, especially in unidirectional composites with the weak fiber-matrix adhesion [23,24]. Its AE energy contribution is negligible in mode I delamination propagation where the woven/woven mid plane is used.…”

Section: Resultsmentioning

confidence: 88%

Wavelet-based acoustic emission characterization of damage mechanism in composite materials under mode I delamination at different interfaces

Oskouei¹,

Ahmadi

Hajikhani³

2009

Express Polym. Lett.

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Abstract. In this paper, acoustic emission (AE) monitoring with a wavelet-based signal processing technique is developed to detect the damage types during mode I delamination on glass/polyester composite materials. Two types of specimen at different midplane layups, woven/woven (T3) and unidirectional/unidirectional (T5), leading to different levels of damage evolution, were studied. Double cantilever beam (DCB) is applied to simulate delamination process for all specimens. Firstly, the obtained AE signals are decomposed into various wavelet levels. Each level includes detail and approximation that are called components and related to a specific frequency range. Secondly, the energy distribution criterion is applied to find the more significant components each one of which is in relation to a distinct type of damage. The results show that the energy of AE signals has been concentrated in three significant components for both of the specimens. There is a difference in energy distribution of similar components of two specimens. It indicates that there is a dissimilar dominant damage mechanism for two different interfaces during the delamination process. Additionally, the microscopic observation (SEM) is used to determine how the different fracture mechanisms are related to the dominant corresponding wavelet components.

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“…The slope of this line is S 1 . The Mode I interlaminar fracture toughness is calculated as follows: (5) Morais et al [10][11] and Choi et al [12] assessed the applicability of DCB test for multidirectional laminates. Multidirectional laminates frequently pose problems because of crack branching or deviations of the delamination from the central plane.…”

Section: Modified Compliance Calibration (Mcc) Methodmentioning

confidence: 99%

Experimental Methods of Determining Fracture Toughness of Fiber Reinforced Polymer Composites under Various Loading Conditions

Prasad¹,

Venkatesha²,

Jayaraju³

2011

JMMCE

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Mode I interlaminar fracture of carbon/epoxy multidirectional laminates

Cited by 139 publications

References 21 publications

Prediction of delamination growth in carbon/epoxy composites using a novel acoustic emission-based approach

Prediction of delamination growth in carbon/epoxy composites using a novel acoustic emission-based approach

Wavelet-based acoustic emission characterization of damage mechanism in composite materials under mode I delamination at different interfaces

Experimental Methods of Determining Fracture Toughness of Fiber Reinforced Polymer Composites under Various Loading Conditions

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