Hydrodynamic Ram Test of Composite T-Joint Structure

Kim, Jong Heon; Seo, Bohwi

doi:10.1007/s42405-021-00377-9

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…[1][2][3] Further, the delamination can be susceptible to low-velocity impact, which can occur during in-service environments such as tool drops, bird strike, service vehicle collisions, hail, lightning strike, and runway debris. [4][5][6] When subjected to external loads and stress concentration in composite structures, which could be induced in the main characteristic of failure modes can be in the form of inter-laminar damages such as matrix-cracking, interfacial deboning, fiberbreakage, and delamination, usually named barely visible impact damage (BVID) based on their inherent non-homogenous and anisotropic material properties (e.g., projectiles and impact energy levels). [7][8][9] Moreover, when propagating the crack tips of BVID at the around fiber, damage initiation can result in further damage related to delamination and degradation of their mechanical properties related to stiffness and compressive strengths.…”

Section: Introductionmentioning

confidence: 99%

Injection repair of CFRP using a multi-Wall carbon nanotubes-modified epoxy resin: Flexural and compression behavior

Shin

Choe

Lee

et al. 2022

Journal of Composite Materials

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This study presented the details of multi-wall carbon nanotubes (MWCNTs)-modified resin injection repair aiming to enhance the mechanical properties, considering the flexural and compression behavior. The resin injection of epoxy resin dispersed with MWCNTs (0.1, 0.3, and 0.5 wt.%) as low viscosity resin that delaminated composite structure repair was conducted using a developed vacuum-based resin injection system at 80°C with constant injection pressure. The quasi-static indentation (QSI) method with a circular window was applied to create the barely visible impact damage (BVID) in the laminate specimen and thus obtain the delamination damage with reproducibility. The flexural strength and compression after impact (CAI) test were conducted on repaired carbon fiber reinforced laminates to assess the effect of the dispersion of the MWCNTs in the epoxy resin injection approach compared to neat epoxy resin. The mechanical test results exhibited that the recovery rate was better improved in the case of the modified resin infiltration approach in laminate composites dispersed with nanoparticles. It was attributed to their more enhanced strengthening mechanisms under effective interaction in mixed interface of fiber-matrix-MWCNTs, mainly attributing to bridge connection and stronger interfacial adhesion properties.

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