Mode I delamination fatigue properties of interlayer-toughened CF/epoxy laminates

Hojo, Masaki; Matsuda, Satoshi; Tanaka, Mototsugu; Ochiai, Shojiro; Murakami, Atsushi

doi:10.1016/j.compscitech.2005.07.038

Cited by 194 publications

(108 citation statements)

References 26 publications

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“…b) To characterize the propagation phase by means of the crack growth curve da/dN-∆G. The onset of delamination growth was decided by visual observation, i.e., the number of crack initiation cycles was the number of cycles from the beginning of the test to the visual observation of a crack at the end of the insert [15,16]. These results are very similar to those obtained from the conventional fatigue test.…”

Section: Fatigue Characterizationsupporting

confidence: 76%

Interlaminar crack initiation and growth under modes I and II in a carbon-fibre epoxy composite subjected to fatigue

Argüelles¹,

Viña²,

Canteli³

et al. 2008

WIT Transactions on the Built Environment

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In this paper, interlaminar crack initiation and propagation under modes I and II dynamic loading of a composite material, with epoxy matrix and unidirectional carbon fibres were evaluated. Delamination commenced in mode I employing the DCB (Double Cantilever Beam) test. In mode II, the ENF (End Notched Flexure) test was used. The fracture toughness in mode I was obtained using the methods of the ASTM D5528 Standard, while in mode II, the methods were applied in accordance with the ESIS (European Structural Integrity Society) Protocol. Employing this experimental program, the fatigue curves (∆G, N) and growth rate curves (∆G, da/dN) in both fracture modes were determined for an asymmetry ratio of R=0,2. The influence of the manufacturing process of the material on its behaviour with respect to crack growth onset may be deduced from the experimental results. Moreover, as the crack growth rate decreases for large crack lengths, crack growth may even cease if the critical fracture energy does not increase above the values obtained in the static characterization of the material.

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Section: Fatigue Characterizationsupporting

confidence: 76%

Interlaminar crack initiation and growth under modes I and II in a carbon-fibre epoxy composite subjected to fatigue

Argüelles¹,

Viña²,

Canteli³

et al. 2008

WIT Transactions on the Built Environment

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“…A deformation rate of 0.5 mm/min was applied throughout the tests [14]. The experimental results obtained for the static fracture toughness G c according to the three methods are summarized in Table 1 showing an acceptable agreement: Table 1.…”

Section: Modified Beam Methods (Mbt) the Compliance Calibration Methomentioning

confidence: 90%

“…The crack growth rate, i.e., the da/dN-G curves, were determined for a fraction of the critical energy release rate G crit (80%) and for different R=δ min /δ max relations [14]. A frequency of 3 Hz was applied throughout the tests.…”

Section: A) ∆G-n Fatigue Curvesmentioning

confidence: 99%

Interlaminar crack initiation and growth rate in a carbon-fibre epoxy composite under mode-I fatigue loading

Argüelles

Viña

Canteli

et al. 2008

Composites Science and Technology

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“…3D investigation of the complete ε xx strain field has shown that the particles de-bond at about 1-1.5 % strain, with significant additional damage including resin cracking, occurring above about 3 %. By having particles de-bonding ahead of the crack tip, the system facilitates a lower energy crack path, whereby the crack will follow the (de-bonded) particles rather than deviating to the interface, as has been seen to occur in similar interlayered systems [31].…”

Section: -Damage Evolution and Fracture Micro-mechanismsmentioning

confidence: 99%

Three-dimensional deformation mapping of Mode I interlaminar crack extension in particle-toughened interlayers

et al. 2016

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This paper presents the first use of Digital Volume Correlation (DVC) on Carbon Fibre Reinforced Plastics (CFRPs) to quantify the strain fields ahead of a Mode I delamination. DVC is a relatively novel tool that can be used to measure displacements and strains occurring inside materials under load. In conjunction with Computed Tomography (CT), the technique has been applied to porous materials, with results providing strain data for validation of Finite Element (FE) models. However, the application of the technique to laminated materials has been limited, with studies often requiring fiducial markings required for volume correlation. In this work, crack propagation steps were captured at a 325 nm voxel resolution using Synchrotron Radiation Computed Tomography (SRCT). The material systems investigated featured different crack bridging mechanisms such as; particle-bridges, resin ligaments, and fibre-bridges. An assessment of noise and sub-volume size on the strain measurement determined that the optimal sub-volume size was 150 voxels with 50 % overlap. This provided a spatial resolution of 48.8 µm for strain and a corresponding strain resolution ranging between 220-690 µε for the repeated reference scans. A rigid body translation study confirmed that specimen movements perpendicular to the fibre orientation support the 'real' physical displacements. However, along the fibre direction, the correlation was poor, with correct displacements being detected only within the particle-toughened interlayers. The study demonstrates that strain measurements can be made perpendicular to the fibre direction across the interlayer, which could be used to validate future FE models of these poorly understood particle-toughened interlayers.

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Mode I delamination fatigue properties of interlayer-toughened CF/epoxy laminates

Cited by 194 publications

References 26 publications

Interlaminar crack initiation and growth under modes I and II in a carbon-fibre epoxy composite subjected to fatigue

Interlaminar crack initiation and growth under modes I and II in a carbon-fibre epoxy composite subjected to fatigue

Interlaminar crack initiation and growth rate in a carbon-fibre epoxy composite under mode-I fatigue loading

Three-dimensional deformation mapping of Mode I interlaminar crack extension in particle-toughened interlayers

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