Quasi-static tensile behavior and damage of carbon/epoxy composite reinforced with 3D non-crimp orthogonal woven fabric

Bogdanovich, A. E.; Karahan, Mehmet; Lomov, Stepan Vladimirovitch; Verpoest, Ignace

doi:10.1016/j.mechmat.2013.03.005

Cited by 122 publications

(84 citation statements)

References 26 publications

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“…In these materials the shear defects in form of fiber debonding were dominant and they were the most visible in performed SEM analyzes, as the shear stresses in this SBS experimental set up may be reinforced by the fiber "scissoring effect" [24]. In selected CFRP composite samples with average fiber volume content (51%), the SBS test was interrupted after the AE historic index exceeded the value of 1,4 ( Fig.…”

Section: Shear Tests In Cfrp Samples Cut In Bias Directionsmentioning

confidence: 89%

“…In order to reduce the sources of variability, this work concentrated on examination of the two most popular carbon fiber architectures applied in contemporary composites -unidirectional (1D) and plain-weave (2D) laminates. The third series studied were the 2D pseudo angle-ply CFRP materials, and these were of interest because of much larger fracture strains and much lower strengths than in pseudo cross-ply composites [24]. In all three series of composites the effects of fiber volume fraction were evaluated.…”

Section: Methodsmentioning

confidence: 99%

“…3b), as well as in samples cut in two orthogonal bias directions. In the latter case, the absolute values of SBS are much lower than those measured for samples cut along warp/fill tows, while their fracture strains are much larger [24,25]. The inter-laminar shear strength (ILSS) of examined composites is represented by the SBS values measured in [90] n transverse direction (denoted X in Fig.…”

Section: Short-beam-strength (Sbs) and Interlaminar Shear Strength (Ilss)mentioning

confidence: 99%

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Acoustic Emission from Microcrack Initiation in Polymer Matrix Composites in Short Beam Shear Test

et al. 2018

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Acoustic emission (AE) was applied for detection of microcrack initiation in carbon fiber reinforced polymer composites subjected to shear stresses. Experimental materials were prepared from polyester bonded unidirectional (1D) non-crimp fabric and 2D plain-weave carbon fiber fabrics, using the resin transfer moulding technology. Control of epoxy resin/carbon textile proportions enabled variation of fiber volume content from small (34/35% for 2D/1D), through medium (51%) to high (68%). Rectangular samples (45 × 4 × 2 mm) were cut from 1D plates along [0] and across [90] fibers. Similar size samples from 2D plates were cut along warp/weft axes as well as in two orthogonal bias directions. Selected side surfaces were polished for microscopic (SEM) observations. Short-beam-strength tests were performed in 3-point bending (l/h=4), with two AE sensors attached for damage monitoring, which allowed to interrupt loading sequence before final failure. The acoustic emission historic index was the most effective AE parameter in damage initiation control. Microcracks developing on polished composite side-surfaces were observed under the SEM and direct microscopic evidence confirmed fiber debonding to be the principal mechanism of crack initiation in these materials and testing conditions before any further damage.

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Section: Shear Tests In Cfrp Samples Cut In Bias Directionsmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Short-beam-strength (Sbs) and Interlaminar Shear Strength (Ilss)mentioning

confidence: 99%

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Acoustic Emission from Microcrack Initiation in Polymer Matrix Composites in Short Beam Shear Test

et al. 2018

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“…As the load was increased, the crimped tows below the specimen's neutral plane subjected to tension tried to straighten along the loading direction, which was prevented by the tows in the transverse direction resulting in an increasing composite stiffness and ultimate strain as elaborated in Ref. [15]. At still higher loads, one or more aligned stiff tows ruptured earlier, at about 90% of the ultimate load, causing the load drop before catastrophic failure of the warp specimens (see the stress-strain curve in Fig.…”

Section: Discussion Of Flexural-test Resultsmentioning

confidence: 99%

Characterisation of mechanical behaviour and damage analysis of 2D woven composites under bending

Ullah

Harland

Silberschmidt

2015

Composites Part B: Engineering

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Additional Information:• NOTICE: this is the author's version of a work that was accepted for publication in Composites Part B: Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document.Changes In this paper, flexural loading of woven carbon fabric-reinforced polymer laminates is studied using a combination of experimental material characterisation, microscopic damage analysis and numerical simulations. Mechanical behaviour of these materials was quantified by carrying out tensile and largedeflection bending tests. A substantial difference was found between the materials' tensile and flexural properties due to a size effect and stress stiffening of thin laminates. A digital image-correlation technique capable of full-field strain-measurement was used to determine in-plane shear properties of the studied materials. Optical microscopy and micro-computed tomography were employed to investigate deformation and damage mechanisms in the specimens fractured in bending. Various damage modes such as matrix cracking, delaminations, tow debonding and fibre fracture were observed in these microstructural studies. A two-dimensional finite-element (FE) model was developed to analyse the onset and propagation of inter-ply delamination and intra-ply fabric fracture as well as their coupling in the fractured specimen. The developed FE model provided a correct prediction of the material's flexural response and successfully simulated the sequence and interaction of damage modes observed experimentally.

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“…The AE data collected serves as a record of sound signals emitted due to material cracking events. As mentioned in [2] and [3], such data can be useful in reflecting different stages of damage development in a specimen. As can be seen from Table 2 and Fig.…”

Section: Materials and Test Set-upmentioning

confidence: 99%

Experimental Investigation of Damage Process in Layer-to-layer Interlock 3D Woven Composites under Uniaxial Tension

Yu¹,

Li²

2017

Proceedings of the Second International Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2017)

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Abstract. The damage behaviour of a type of layer-to-layer interlock 3D woven composite loaded under quasi-static uniaxial tension is studied in this paper. Based on the experimental result obtained, it can be concluded that the development of inter-yarn cracks between warp yarns and the development of through-the-thickness transverse cracks had caused the nonlinear stress-strain responses for loading cases in warp and weft directions respectively. The experimental result provided here may serve as a good reference, based on which a corresponding material damage model may be devised for this type of composite material.

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Quasi-static tensile behavior and damage of carbon/epoxy composite reinforced with 3D non-crimp orthogonal woven fabric

Cited by 122 publications

References 26 publications

Acoustic Emission from Microcrack Initiation in Polymer Matrix Composites in Short Beam Shear Test

Acoustic Emission from Microcrack Initiation in Polymer Matrix Composites in Short Beam Shear Test

Characterisation of mechanical behaviour and damage analysis of 2D woven composites under bending

Experimental Investigation of Damage Process in Layer-to-layer Interlock 3D Woven Composites under Uniaxial Tension

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