An investigation of repair methods for delaminated composite laminate under flexural load

Kwak, Byeong-Su; Lee, Gwang-Eun; Kang, Gyu-Seok; Kweon, Jin‐Hwe

doi:10.1016/j.compstruct.2019.02.037

Cited by 15 publications

(4 citation statements)

References 19 publications

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“…In contrast to CAI test results, the results of the fracture mechanics test did not reach the pristine specimens because the repair resin exhibited toughness properties lower than an adherent. Kwak et al 30 conducted the resin injection in artificial delamination in the laminates using EA9396, a low-viscosity and room-temperature curing epoxy adhesive as repair materials. Subsequently, the effect of resin injection repair under three-point bending test subjected to flexural load was evaluated to evaluate their repaired bending strength, which exhibited excellent repair efficiency to the artificial delamination in the mid-plane of specimens.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, many researchers have reported the resin injection repair technique to be appropriate for providing the permanent restoration in internal damages and thus stop the spreading of cracks using the low viscosity with room temperature curing resin considering their surface energy. 9,[13][14][15][16][17] In particular, several researchers have explored the use of bisphenol E cyanate ester (BECy), [18][19][20] cyanoacrylates, 21,22 and epoxy [23][24][25][26][27][28][29][30] resin to restore BVID in the carbon fiber reinforced polymer (CFRP) laminates. Table 1 lists the resin injection repair methods based on the types of resin and their strength recovery rates following repair reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…There are many studies investigating the advantages and disadvantages of all these techniques subjected to bending, tension, compression, and impact loadings. [6][7][8][9][10] On the other hand, there has been not so much study on scarf angle so far. For example, Truong et al 5 used both experimental and numerical methods to investigate the damage under bending loads of composite laminates repaired by patch filling method with scarf angles of 5.7°and 3.8°.…”

Section: Introductionmentioning

confidence: 99%

Effects of repair techniques and scarf angles on mechanical performance of composite materials

Karaduman

Elaldi

2022

Journal of Reinforced Plastics and Composites

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Today, composite materials, which have the advantage of strength and lightness ratio, have gained great importance especially in the aeronautical industry and automotive sector. With widespread use of composites, the repair of damages caused by external factors has also become an important research topic. In this study, the effects of different repair methods and scarf angles on the mechanical performance of the material were investigated. Scarf angles of 20°, 30°, and 45° have been selected in order not to create too many scarf areas and to find a quick repair method. Also, a comparison of single scarf and double scarf repair was made to find a more robust solution. The samples were produced from carbon fiber prepreg and with the [45/0/90/0/45]2s fiber orientation. Tensile, compression, and flexural (3-point bending) tests according to ASTM standards were applied to composite samples prepared with single scarf and double scarf repair configurations at different angles. The stress–strain curves obtained as a result of the tests showed that the specimens repaired at 20° had the highest strength. In addition, it has been determined that the samples repaired with double scarf withstand higher forces compared to the samples repaired with single scarf at the same angle.

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“…Over the last decade, a large number of experimental, analytical and numerical studies on the mechanical performance of nonferrous light metals and composite structures repaired with composite patches have been presented. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Liu et al 13 reported a study on the tensile behavior of open-hole composite plates bonded with external composite patches. They also developed a 3-D progressive damage model and investigated the effects of different repair parameters on the ultimate strength and failure mechanism of the repaired structures.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on low velocity impact behavior of thermoplastic composites repaired by composite patches

Zorer

Özdemir

Öztoprak

2020

Journal of Composite Materials

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In this study, low velocity impact behavior of E-glass fiber-reinforced thermoplastic composites repaired by pressing external laminated composite patches was investigated by experimental methods. Thermoplastic composites were manufactured from polypropylene granules with two different fiber contents of 40 wt. % and 60 wt. %. Repaired specimens were prepared by using unidirectional E-glass reinforced polypropylene based thermoplastic prepregs. In order to compare the low velocity impact behavior of the repaired and unrepaired specimens, a number of single impact tests (ranging from energy levels of 10 J to 50 J) were carried out through a drop weight impact test machine with a hemispherical impactor. Low-velocity impact response of the specimens was investigated with cross-examining contact force-deformation curves and damaged specimens. Impact damages occurred in the upside and bottom surfaces of the composites were recorded from the visual inspection and compared for repaired and unrepaired specimens. According to experimental results, bending stiffness and maximum contact force of the specimens having fiber content of 60 wt.% are higher than those of 40 wt.%. Moreover, it was concluded that the patch repaired specimens have achieved a better performance in terms of maximum contact force and absorbed energy compared to the intact specimens.

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An investigation of repair methods for delaminated composite laminate under flexural load

Cited by 15 publications

References 19 publications

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

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

Effects of repair techniques and scarf angles on mechanical performance of composite materials

An experimental study on low velocity impact behavior of thermoplastic composites repaired by composite patches

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