Effect of reinforcement shear and mesoscopic defects on the low velocity impact behavior of a GFRP

Kacimi, Bachir; Djebbar, Arezki; Allaoui, Samir; Hivet, Gilles; Teklal, Fatiha

doi:10.1007/s12289-019-01521-3

Cited by 4 publications

(2 citation statements)

References 51 publications

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“…One first study highlighting this mesoscopic defect on the woven fabric experimentally is done by Allaoui et al [98] (in 2007) with the shaping of interlock reinforcement on complex geometry. The yarn buckling can manifest with or without changing the fabric weaving pattern [45] but being an out-of-plane deformation it alters the thickness of the preform [5] and degrade mechanical properties of the composite material [99,100]. This mesoscopic defect manifests when the yarn undergoes stress that forces it to buckle and deform in an out-ofplane curve.…”

Section: ) Out-of-plane Defectmentioning

confidence: 99%

Composite preforming defects: a review and a classification

2021

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Advancing in the process of extending the use of composites for structural parts applications, it is inevitable to work on complex shapes. That is the main reason why understanding the complex forming mechanisms and the factors put into play during the process of composite materials is a major interest for both pre-impregnated forming and dry fabric preforming. Thus, the apdpearance of defects is a major concern and predicting their appearance for optimal product quality is the priority. A great number of authors showed that defects degrade the overall performance of the composite by creating local heterogeneities. Many factors can initiate these defects. This article is an assembly of the development of the literature on this subject. It is an attempt to provide a description for each defect and a classification order following the scale, the behavior mechanisms, the appearance plan. This will help to converge toward an identification of the defects manifesting during the composite forming.

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Section: ) Out-of-plane Defectmentioning

confidence: 99%

Composite preforming defects: a review and a classification

2021

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“…[19,20] Forming defects can occur at macroscopic (at the fabric) and mesoscopic (at the yarn) scales. [21][22][23] Meso-scale yarn defects such as missing yarn significantly affect FRP's macroscopic properties, mechanical behavior, and service life [24] by creating resin-rich regions. [25] Moreover, these resin-rich regions can host mesoscale voids, generate micro-cracks, and accelerate the aging process by increasing water absorption.…”

Section: Introductionmentioning

confidence: 99%

Effects of meso‐ and micro‐scale defects on hygrothermal aging behavior of glass fiber reinforced composites

et al. 2022

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Design and process-induced defects in fiber-reinforced polymers (FRPs) lead to fracture nucleation due to the stress concentrations. In addition to the degradation in mechanical properties, defects can accelerate aging of FRPs and limit their service life. Efforts to understand the impact of defects have largely focused on the mechanical performance of FRPs. However, their impact on aging performance has not yet been extensively investigated. Here, we report the effect of the meso-scale (missing yarn) and micro-scale (micro-crack) defects on the hygrothermal aging behavior of FRPs. Missing yarn defects were generated by pulling-out yarns in warp and weft directions of glass fabric. Then, micro-cracks were induced in composite laminates by acoustic emission controlled tensile loading/unloading. After exposing samples to the hygrothermal aging, we found that meso-scale defects deteriorate mechanical/ thermomechanical performance, reaching 30% decrease in the flexural strength. Notably, even though increasing micro-crack density reduces the moisture saturation time, the aging time is reported as a more predominant design parameter, deteriorating the mechanical performance for micro-crackinduced FRPs.

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Study of the slippage and sliding mesoscopic defects during complex shape preforming of woven fabric

Khris,

Ouali,

Hocine

et al. 2024

Int J Mater Form

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Effect of reinforcement shear and mesoscopic defects on the low velocity impact behavior of a GFRP

Abstract: Effect of reinforcement shear and mesoscopic defects on the low velocity impact behavior of a GFRP.Bachir KACIMI (a) , Arezki DJEBBAR (a) , Samir ALLAOUI (b) *, Gilles HIVET (C) , Fatiha TEKLAL (a)

Cited by 4 publications

References 51 publications

Composite preforming defects: a review and a classification

Composite preforming defects: a review and a classification

Effects of meso‐ and micro‐scale defects on hygrothermal aging behavior of glass fiber reinforced composites

Study of the slippage and sliding mesoscopic defects during complex shape preforming of woven fabric

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