Damage accumulation in a carbon/epoxy composite: Comparison between a multiscale model and computed tomography experimental results

Scott, A.E.; Sinclair, Ian; Spearing, S.M.; Thionnet, Alain; Bunsell, Anthony R.

doi:10.1016/j.compositesa.2012.03.011

Cited by 118 publications

(80 citation statements)

References 40 publications

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“…The work presented here compares the experimental data with the fibre-bundle model of Swolfs et al [33][34][35][36]. A similar comparison has already been attempted in Scott et al [37]. Their model predictions were reasonable at low applied strains, but seemed to diverge at higher strains.…”

Section: Introductionsupporting

confidence: 59%

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Synchrotron radiation computed tomography for experimental validation of a tensile strength model for unidirectional fibre-reinforced composites

Swolfs

Morton

Scott

et al. 2015

Composites Part A: Applied Science and Manufacturing

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Section: Introductionsupporting

confidence: 59%

“…The same experiments as in Scott et al [37] were used, but the cluster pattern and growth were also tracked this time, leading to new insights in the failure process. Conclusions are drawn by comparing the experimental and simulated results, leading to recommendations for further model development.…”

Section: Introductionmentioning

confidence: 99%

Synchrotron radiation computed tomography for experimental validation of a tensile strength model for unidirectional fibre-reinforced composites

Swolfs

Morton

Scott

et al. 2015

Composites Part A: Applied Science and Manufacturing

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100

151

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“…However, the model proposed overestimated the accumulation of fibre breaks, underestimated the cluster formation, and also predicted diffuse rather than co-planar clusters in contrast with the experimental observations [20]. The underestimation of cluster formation was also found to be a weakness of a different modelling strategy documented in work by Scott et al [4]. The assessment of fibre breaks in composites under fatigue loading is not trivial due to the fact that in situ tests are highly desirable to monitor their accumulation.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 66%

“…Although carbon fibre composites are relatively fatigue insensitive they generally do have downward sloping S-N curves and finite life under fatigue loading [3]. However, f Fibre failure is known to constitute the critical damage mechanism in tension, for which the axial strength of unidirectional composites is assumed to be controlled by the strength distribution of the fibres [4]. Several modelling approaches have been developed to predict fibre-dominated tensile strength, taking into account the fibre strength distribution [5], stress transfer around broken fibres [6][7][8][9][10][11][12][13], and the formation of clusters of fibre breaks [14,15].…”

Section: Introductionmentioning

confidence: 99%

Fibre failure assessment in carbon fibre reinforced polymers under fatigue loading by synchrotron X-ray computed tomography

Garcea

Sinclair

Spearing

2016

Composites Science and Technology

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Please cite this article as: Garcea SC, Sinclair I, Spearing SM, Fibre failure assessment in carbon fibre reinforced polymers under fatigue loading by synchrotron X-ray computed tomography, Composites Science and Technology (2016), doi: 10.1016/j.compscitech.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractIn situ fatigue experiments using synchrotron X-ray computed tomography (SRCT) are used to assess the underpinning micromechanisms of fibre failure in double edge notch carbon/epoxy coupons. Observations showed fibre breaks along the 0º ply splits, associated with the presence and failure of bridging fibres, as well as fibres failed in the bulk composite within the 0º plies. A tendency for cluster formation, with multiple adjacent breaks in the bulk composite was observed when higher peak loads were applied, exceeding 70% of the ultimate tensile stress. Ex situ fatigue tests were used to assess the accumulation and distribution of fibre breaks for different loading conditions, varying peak load and number of cycles. A direct comparison with the quasi-static case for an equivalent peak load, considering the same material system and geometry, hasshown that fatigue produces a significantly higher number of fibre breaks. This supports the hypothesis that fibre breaks are indeed caused by the load cycling.

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“…Depending on the geometry, strength distribution and degree of fiber/matrix debonding, the material may be able to redistribute the load successfully, leading to an accumulation of fiber breaks within the composite. 1 Eventually, a critical cluster of fiber breaks forms, [2][3][4] which is associated with a critical local stress concentration that can no longer be carried by the adjacent fibers, leading to crack propagation and, therefore, sudden and catastrophic failure of the composite. Composite structures manifest a wide range of toughening mechanisms including interfacial debonding, 5 post-debonding…”

Section: Introductionmentioning

confidence: 99%

Increasing carbon fiber composite strength with a nanostructured “brick-and-mortar” interphase

et al. 2018

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Registered charity number: 207890 rsc.li/materials-horizons Showcasing a nacre-nanomimetic structure conformally deposited around the circumference of multiple carbon fibres by layer-by-layer assembly by researchers at Imperial College London. Artwork designed and created by Eloise De Luca.Increasing carbon fiber composite strength with a nanostructured "brick-and-mortar" interphase Toughening mechanisms occurring in nacre, such as crack deflection and platelet interlocking mechanisms, were reproduced in a nanomimetic coating. The coating was transferred onto the modified surface of carbon fibre tows for use as an interphase. Impregnated fibre tow model composites demonstrated increases in absolute tensile strength and strain-to-failure, as compared to composites containing conventionally sized fibres. As featured in:See an optimized ''brick-and-mortar'' nanostructured interphase was developed, in order to absorb energy at fiber breaks and alleviate local stress concentrations whilst maintaining effective load transfer. The coating was designed to exploit crack bifurcation and platelet interlocking mechanisms known in natural nacre. However, the architecture was scaled down by an order of magnitude to allow a highly ordered conformal coating to be deposited around conventional structural carbon fibers, whilst retaining the characteristic phase proportions and aspect ratios of the natural system.Drawing on this bioinspiration, a Layer-by-Layer assembly method was used to coat multiple fibers simultaneously, providing an efficient and potentially scalable route for production. Single fiber pull-out and fragmentation tests showed improved interfacial characteristics for energy absorption and plasticity. Impregnated fiber tow model composites demonstrated increases in absolute tensile strength (+15%) and strain-to-failure (+30%), as compared to composites containing conventionally sized fibers.

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Damage accumulation in a carbon/epoxy composite: Comparison between a multiscale model and computed tomography experimental results

Cited by 118 publications

References 40 publications

Synchrotron radiation computed tomography for experimental validation of a tensile strength model for unidirectional fibre-reinforced composites

Synchrotron radiation computed tomography for experimental validation of a tensile strength model for unidirectional fibre-reinforced composites

Fibre failure assessment in carbon fibre reinforced polymers under fatigue loading by synchrotron X-ray computed tomography

Increasing carbon fiber composite strength with a nanostructured “brick-and-mortar” interphase

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