Analysis of fracture process in single-edge-notched laminated composites based on the high amplitude acoustic emission events

Woo, Sung-Choong; Choi, Nak–Sam

doi:10.1016/j.compscitech.2006.07.022

Cited by 50 publications

(29 citation statements)

References 12 publications

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“…These observations are in accordance with [5,8,10,15,16] where fatigue damage in the on-axis directions is initiated by cracks in transverse fibre yarn, and are deflected along the longitudinal yarn (meta-delamination) and finally leads to 0°tow fracture at crimp regions.…”

Section: Warp and Weft Directionsupporting

confidence: 90%

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Fatigue crack growth in thin notched woven glass composites under tensile loading. Part I: Experimental

Bizeul

Barrau

Cuenca³

2011

Composites Science and Technology

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a b s t r a c tHelicopter blades are made of composite materials mainly loaded in fatigue and have normally relatively thin skins. A through-the-thickness crack could appear in these skins. The aim of this study is to characterize the through-the-thickness crack propagation due to fatigue in thin woven glass fabric laminates. A technological test specimen is developed to get closer to the real loading conditions acting on these structures. An experimental campaign is undertaken which allows evaluating crack growth rates in several laminates. The crack path is linked through microscopic investigations to specify damage in woven plies. Crack initiation duration influence on experimental results is also underlined.

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Section: Warp and Weft Directionsupporting

confidence: 90%

“…12). As observed by Woo et al [16], the through-the-thickness crack propagates perpendicular to yarn fibres and thus shifts alternately between ±45°directions. The entire crack path remains overall straight and perpendicular to the load direction.…”

Section: Bias Directionmentioning

confidence: 72%

Fatigue crack growth in thin notched woven glass composites under tensile loading. Part I: Experimental

Bizeul

Barrau

Cuenca³

2011

Composites Science and Technology

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“…Again, there exists a threshold COD th (alike to threshold strain) for the onset of AE activity in both composites. The existing of such COD th which indicates that any damage not yet occur in the specimen is also reported by Woo and Choi [19] for unidirectional glass-fiber/epoxy resin prepregs. The corresponding K, designated by K IAE is almost half of the LP K IC whereas for the HP it is only a third of the K IC .…”

Section: Resultsmentioning

confidence: 66%

Damage evolution and fracture events sequence in various composites by acoustic emission technique

Bussiba¹,

Kupiec²,

Ifergane³

et al. 2007

Composites Science and Technology

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Three composites materials, Glare 2 fiber metal laminates, graphite/epoxy (Gr/Ep) and carbon/carbon (C/C) have been tested mechanically under quasi-static loading in uniaxial and bending modes using uniform and notched specimens. Acoustic emission (AE) technique was utilized in tracking the damage accumulation profile during loading up to fracture in terms of AE counts rate and cumulative. In addition wavelet transforms was used to process AE signals in order to obtain both frequencies and time information on the main failure mechanism and the sequential events during fracture process. This was supported by light and electron microscopies characterizations. The mechanical and acoustical responses were examined with respect to orientation and temperature effects for the Glare 2, exposure temperature effect for the Gr/Ep and porosity degree effect for the C/C. Manifestly, the AE results demonstrate different damage build-up profiles and point to a transition in failure micro-mechanisms with respect to the influence of each parameter (temperature, orientation, and density) on the specific composite tested. For the Gr/Ep, the wavelet transforms indicate the sequence of events in the fracture process, from fiber breaks followed by debonding and ending with matrix cracking. In some cases, it has been observed that the damage accumulation profile in terms of AE resembled the dependency of the crack density versus the strain predicted by a micro-mechanical damage model.

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“…): specimens with an central circular hole[18- 19] and SEN specimens[37][38][45]. The tensile mechanical properties were determined according to the European standards EN 6035[46].…”

mentioning

confidence: 99%

Prediction of the notched strength of woven-ply PolyPhenylene Sulfide thermoplastic composites at a constant high temperature by a physically-based model

Vieille

Chabchoub

Bouscarrat

et al. 2016

Composite Structures

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Analysis of fracture process in single-edge-notched laminated composites based on the high amplitude acoustic emission events

Cited by 50 publications

References 12 publications

Fatigue crack growth in thin notched woven glass composites under tensile loading. Part I: Experimental

Fatigue crack growth in thin notched woven glass composites under tensile loading. Part I: Experimental

Damage evolution and fracture events sequence in various composites by acoustic emission technique

Prediction of the notched strength of woven-ply PolyPhenylene Sulfide thermoplastic composites at a constant high temperature by a physically-based model

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