In situ observation of kink-band formation in a unidirectional carbon fiber reinforced plastic by X-ray computed tomography imaging

Ueda, Masahiro; Mimura, Kento; Jeong, Tae-Kun

doi:10.1080/09243046.2014.973173

Cited by 46 publications

(13 citation statements)

References 13 publications

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“…The results are summarized in Figure 11. In the case of a unidirectional CFRP with approximately 60% fiber volume fraction, the kink-band angle was 5˚ -30˚ and the kink-band width was 60 -150 μm [ [17]. The kink-band parameters for the 11,000 fibers model composite were approaching that of the unidirectional CFRP.…”

Section: Lower Fiber 20μmmentioning

confidence: 99%

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Longitudinal Compressive Failure of Multiple-Fiber Model Composites for a Unidirectional Carbon Fiber Reinforced Plastic

Jeong¹,

Ueda²

2016

OJCM

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The longitudinal compressive failure of a unidirectional carbon fiber reinforced plastic (CFRP) was studied using multiple-fiber model composites. Aligned carbon fibers were embedded in an epoxy matrix and put on a rectangular beam. A compression test of the model composite was performed by means of a four point bending test of the rectangular beam. The number of carbon fibers was changed from one to several thousands, by which the effect on compressive failure modes was investigated. A compressive failure of a single-fiber model composite was fiber crush. The fiber crush strain was much higher than the compressive failure strain of the unidirectional carbon fiber reinforced plastic. By contrast, a compressive failure of a multiple-fiber model composite was kink-band. The longitudinal compressive failure mechanism shifted from fiber crush to kink-band due to an increasing number of fibers. Kink-band parameters i.e. kink-band angle and kink-band width were dependent on the number of closely-aligned carbon fibers.

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Section: Lower Fiber 20μmmentioning

confidence: 99%

“…Kink-band failure is known as a primary cause of low compressive strength. Many experimental research efforts into kink-band failure have been published [3]- [17]. Kinkband parameters, i.e.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal Compressive Failure of Multiple-Fiber Model Composites for a Unidirectional Carbon Fiber Reinforced Plastic

Jeong¹,

Ueda²

2016

OJCM

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“…Geometric information of the kink-bands was obtained and information about the failure mechanisms within the kink-band was provided from tomographic reconstructions with high spatial resolution. CT monitored compressive tests have also been performed to study damage growth in-situ [3,4]. The progression of a kink-band can occur with very high speed and an attempt to capture this using ultra-fast time-laps CT with a synchrotron X-ray source was made by Ueda et al.…”

Section: Introductionmentioning

confidence: 99%

“…The progression of a kink-band can occur with very high speed and an attempt to capture this using ultra-fast time-laps CT with a synchrotron X-ray source was made by Ueda et al. [3]. In a recent study by Emerson et al [4], kink-band formation and growth in notched CFRP specimens was studied in-situ using ultra-fast time-laps CT. Tracking of individual fibres enabled characterisation of fibre orientations with a very high level of accuracy.…”

Section: Introductionmentioning

confidence: 99%

Influence of in-plane shear on kink-plane orientation in a unidirectional fibre composite

Wilhelmsson

Mikkelsen

Fæster

et al. 2019

Composites Part A: Applied Science and Manufacturing

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Kink-band formation is the governing failure mechanism for compressive failure of fibre reinforced composites. Here, kink-plane orientation, describing the direction of kink-band formation, is studied using X-ray computed tomography (CT). Unnotched unidirectional specimens with off-axis angles ranging from 0-20 • are tested in compression. The measured compressive strength is found practically constant for off-axis angles between 0-10 •. For an off-axis angle of 15 • the compressive strength drops dramatically. CT-results reveal this drop to be consistent with a transition from out-of-plane to in-plane dominated kinking. Furthermore, results show the kink-plane angle to be linearly dependant on off-axis angle, and hence in-plane shear stress. A three-dimensional finite element model considering measured fibre misalignment angles through its volume is generated for numerical analysis. Numerical predictions based on the LaRC05 kinking criterion are found to qualitatively capture the experimentally observed effects of off-axis angle on kink-plane orientation.

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“…Generally, composites exhibit significant anisotropic mechanical behavior as well as complex damage accumulation process (fiber breakage, fiber/matrix interfacial debonding, microcracks, delaminations, etc.) compared to traditional isotropic metal/polymer materials [1]- [10]. As application-related damage tolerance consideration (e.g.…”

Section: Introductionmentioning

confidence: 99%

Identification of Damage Parameters for Intralaminar Damage Modeling in Laminated Composites Considering Transverse Stress Effects

Gerrit¹,

Kokubo²,

Yokozeki³

2017

OJCM

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The aim of this study is to develop an appropriate modeling methodology for the simulation of intralaminar damage in laminated composites under complex loadings. The intralaminar damages are modeled by stiffness reduction controlled by thermodynamic forces as defined in continuum damage mechanics model proposed by Ladevèze. The original method neglected transverse stress in elementary plies during the tensile tests of [45/−45]mS laminates, resulting in variations of the identified damage parameters of Ladevèze model. This study compared the identified damage parameters considering transverse stress effects with those based on the original method. The effect of transverse stress in the identification process on the damage modeling is discussed, and it is found that one of damage coupling parameters and the damage master curves significantly depend on consideration of transverse stress effects. Finally, it is demonstrated that experimental stiffness degradation is well simulated by the prediction using the identified parameters considering transverse stress effects.

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In situ observation of kink-band formation in a unidirectional carbon fiber reinforced plastic by X-ray computed tomography imaging

Cited by 46 publications

References 13 publications

Longitudinal Compressive Failure of Multiple-Fiber Model Composites for a Unidirectional Carbon Fiber Reinforced Plastic

Longitudinal Compressive Failure of Multiple-Fiber Model Composites for a Unidirectional Carbon Fiber Reinforced Plastic

Influence of in-plane shear on kink-plane orientation in a unidirectional fibre composite

Identification of Damage Parameters for Intralaminar Damage Modeling in Laminated Composites Considering Transverse Stress Effects

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