Interlaminar fracture in woven carbon/epoxy laminates

Reis, P.N.B.; Ferreira, J.A.M.; Costa, J.D.; Pereira, António

doi:10.3221/igf-esis.30.52

Cited by 10 publications

(10 citation statements)

References 21 publications

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“…This behavior of GIc is similar to that of other studies reported in the literature. 5,27 Specimens 1 and 5, failed dramatically before reaching a crack length of 98.75 mm. Hence, the GIc of these specimens was shown to a crack length of 68.75 mm and 78.75 mm, respectively.…”

Section: B Dcb Resultsmentioning

confidence: 99%

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Interface Characterization of Thermoplastic Skin-Stiffener Composite Manufactured using Laser-Assisted Tape Placement

Bandaru

Clancy

Peeters

et al. 2018

2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Laser-Assisted Tape Placement (LATP) is an advanced manufacturing process which has gained the attention of the aerospace industry. Composite laminates manufactured using this technique have to be characterized effectively to assess their suitability for use in structural applications. A representative skin and stiffener test coupon was manufactured using the LATP method from carbon fiber (CF) reinforced polyether ether ketone (PEEK) tapes. The main objective was to characterize the interaction between skin and stiffener in terms of interlaminar shear strength (ILSS) and fracture toughness (mode-I and mode-II) properties. For initial ILSS tests, non-unidirectional stacking sequences were used for skin and stiffener to ensure failure at their interface. Further, ILSS, double cantilever beam (DCB) and end-notched flexure (ENF) fracture toughness tests were carried out on unidirectional (UD) skin-stiffener laminates. All the mechanical tests were carried out as per ASTM standards. The values of ILSS and fracture toughness in mode-I and mode-II were comparable with the reported results stating the competence of the LATP manufactured CF/PEEK skin-stiffener.

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Section: B Dcb Resultsmentioning

confidence: 99%

“…4 Lecturer, University of Limerick, ronan.ohiggins@ul.ie. 5 Bernal Chair in Composite Materials and Structures, University of Limerick and AIAA Member, paul.weaver@ul.ie.…”

Section: Introductionmentioning

confidence: 99%

Interface Characterization of Thermoplastic Skin-Stiffener Composite Manufactured using Laser-Assisted Tape Placement

Bandaru

Clancy

Peeters

et al. 2018

2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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“…Notably, both curves possessed similarities of at least 98.8%. The gradient of the unidirectional curve ( m ) resulted in a G IIc value of approximately 1175.85 J m −2 , while equations suiting the woven specimen which were described by Reis et al 22 produced a G IIc value of approximately 1408.11 J m −2 .…”

Section: Resultsmentioning

confidence: 99%

“…Several analytical methods were implemented to determine G IIc ; Reis et al utilised a modified crack length measure which was calculated from the specimen compliance. 22 Ogasawara et al used the more common conjugate beam analysis which takes the peak load and displacement into account. 26 Morais and Pereira fit the CC data to a third-order equation and using the resulting parameters calculated G IIc , 27 and the ASTM D7905 standard which was intended for unidirectional ENF specimens.…”

Section: Resultsmentioning

confidence: 99%

Experimental and numerical determination of mode II fracture toughness of woven composites verified through unidirectional composite test data

Healey

Chowdhury

Chiu

et al. 2019

Polymers and Polymer Composites

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Due to the increase in prevalence of fibre-reinforced polymer matrix composites (FRPMC) in aircraft structures, the need for adaption of failure prediction tools such as fatigue spectra has become more pertinent. Fracture toughness is an important measure with regard to fatigue, while adequate techniques and an ASTM standard for unidirectional FRPMC exist, there are mixed opinions when investigating woven FRPMC. This study describes a three-dimensional finite element model developed to assist in determining the mode II interlaminar fracture toughness ( G IIc) of fibre-reinforced woven composites, validated by an experimental and numerical comparison of G IIc determination for unidirectional FRPMC. Experimental testing mirroring the ASTM D7905 resulted in a measure of 1176 J m−2 for the unidirectional specimen, while comparisons made with the literature achieved an average value of 1459.24 J m−2 or the woven specimen. Three numerical methods were employed due to their prominence in the literature: displacement field, virtual crack closure techniques and the J integral. Both the J integral and the displacement field three-dimensional models produced satisfactory unidirectional G IIc estimates of 1284 and 1116.8 J m−2, respectively. Displacement field had a 5% uncertainty in G IIc when compared with experimental results, while J integral had an approximately 8.5% uncertainty. Extending the analysis to the woven specimens, values of 1302.8 and 1465.3 J m−2 were obtained from J integral and displacement field methods, respectively, both within 10% of the experimental values. Hence, numerically determined unidirectional G IIc values were verified with experimental results, leading to the successful employment and extension to woven composites which displayed similar agreement.

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“…The 3-ENF method was originally proposed for testing, but was later developed into the S-ENF, T-ENF and 4-ENF methods [36]. However, according to Pereira et al., [37] the end-notched flexure test is the best method for Mode II testing, owing to its simplicity, negligible friction effects, and low tendency for geometric non-linearity [38].…”

Section: Interlaminar Fracture Toughnessmentioning

confidence: 99%

Nanowire reinforcement of woven composites for enhancing interlaminar fracture toughness

Castellanos

Islam

Shuvo

et al. 2016

Jnl of Sandwich Structures & Materials

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A novel technique to improve the Mode I and Mode II interlaminar fracture toughness of woven carbon-fiber polymer matrix composite face sheets using zinc oxide nanowires is proposed. Zinc oxide nanowires are directionally synthesized on dry carbon fabrics that are used to manufacture the laminate. The influence of zinc oxide nanowires on interlaminar fracture toughness is compared against regular interfaces using double cantilever beam and end-notched flexure tests to provide fracture toughness values. A significant improvement in the Mode I and Mode II interlaminar fracture toughness values is observed with zinc oxide nanowires. Therefore, zinc oxide nanowire interlaminar reinforcement has been proven to enhance the interlaminar fracture toughness of textile composites.

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Interlaminar fracture in woven carbon/epoxy laminates

Cited by 10 publications

References 21 publications

Interface Characterization of Thermoplastic Skin-Stiffener Composite Manufactured using Laser-Assisted Tape Placement

Interface Characterization of Thermoplastic Skin-Stiffener Composite Manufactured using Laser-Assisted Tape Placement

Experimental and numerical determination of mode II fracture toughness of woven composites verified through unidirectional composite test data

Nanowire reinforcement of woven composites for enhancing interlaminar fracture toughness

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