Resin-Injection Repair of Damaged Composites in Aerostructures: Finite Element Modelling of the Effects of Vent Holes in Carbon Fibre-Reinforced Composite Laminates

Lim, Z. Y. D.; Lai, Wei Liang; Saeedipour, H.; Goh, Kheng Lim

doi:10.1007/978-3-030-88192-4_7

Cited by 1 publication

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“…A resin-injection hole (RH) and vent holes (VH) were created on the damaged laminates following a method described in earlier papers. [21,22,25] Figure 1C shows a schematic of the CFRP specimens with circular blind holes. To assign the location of the holes in the specimen, ultrasound C-scan was used to map the BVID area.…”

Section: Creating Resin-injection Holes and Vent Holesmentioning

confidence: 99%

“…The QSI method to produce BVID on laminates were described in earlier papers. [21,22,25] To obtain the BVID size of the order of magnitude of 5 mm diameter on the laminate surface, the loading regime involved a preload of 200 N at a displacement rate of 1 mm/min; subsequently the indenter was driven at 1.25 mm/min corresponded to an energy absorbed (estimated by calculating the area under the loaddisplacement curve) of 3.5 and 12 J to damage the 16-and 24-ply laminates, respectively. These energies fall within the range of energies typically associated with BVID.…”

Section: Creating Barely Visible Damagementioning

confidence: 99%

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In situ resin‐injection approach for repairing barely visible impact damaged carbon‐fiber reinforced epoxy laminates: Optimizing the repair parameters using Taguchi method

et al. 2023

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A new portable resin injection device has been developed to repair barely visible impact damage (BVID) in carbon fiber reinforced polymer (CFRP) laminates. Repair was conducted on damaged 16‐ and 24‐ply laminates at two different ambient pressures, that is, atmospheric pressure and vacuum, using three different adhesive types, that is, neat epoxy, epoxy blended with respective halloysite nanotubes (E1HNT) and carbon nanotubes (NF100). The repair effectiveness was assessed by infrared thermography and in‐plane compression testing. All damaged laminates suffered significant degradation in fracture properties as compared to pristine laminates. According to Taguchi method, the main factor affecting the repair efficiency is the laminate ply number. The findings revealed that the optimal repair parameters corresponds to using neat epoxy or E1HNT in vacuum could restore the elastic properties and using E1HNT adhesive at atmospheric pressure could restore the fracture properties of damaged 16‐ply laminate after repair. Regardless of repair parameters, the repair efficiency for the mechanical properties of 24‐ply laminates revealed minimal restoration to the laminate pristine conditions after repairing the damaged laminates due to the complexity of BVID for allowing the adhesive to infiltrate and filled the crack structures. The choice of repair parameters was discussed based on the effectiveness of restoring elastic and fracture properties.

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Section: Creating Resin-injection Holes and Vent Holesmentioning

confidence: 99%

Section: Creating Barely Visible Damagementioning

confidence: 99%