Flexural characterization of 3D prepreg/stitched carbon/epoxy/multiwalled carbon nanotube preforms and composites

Abstract

The effect of through-the-thickness stitching and incorporation of multiwalled carbon nanotubes (MWCNTs) on the flexural properties of three-dimensional (3D) carbon/epoxy composites was studied. The flexural strength of the carbon twill fabric composites was improved by stitching due largely to delamination suppression, whereas stitching negatively influenced the flexural strength of the carbon satin fabric composites due to stitch-induced irregularities and fiber breakages. The failure mode of the unstitched base (without MWCNTs) and unstitched nano-added structures involved fiber breakage, matrix cracking, and delamination, while the stitched base and stitched nano-added samples exhibited lateral matrix cracking, multiple warp, and stitch yarn breakages with less delamination compared with unstitched structures. The results showed that both stitching and the incorporation of MWCNTs improved the out-of-plane failure properties due largely to restricted delamination. Therefore, stitching and MWCNTs can effectively be used to increase the damage tolerance of carbon fiber/epoxy composite laminates.

Mode-II fracture of nanostitched para-aramid/phenolic nanoprepreg composites by end-notched flexure

“…Some of the physical and mechanical properties of the polyacrylonitrile (PAN) carbon stitching fiber (Aksaca, DowAksa, TR) were that its fiber density was 6 K (6000 filaments), and its modulus, tensile strength, and breaking elongation were 240 GPa, 4200 MPa, and 1.8%, respectively. 104…”

“…Some of the physical and mechanical properties of the polyacrylonitrile (PAN) carbon stitching fiber (Aksaca, DowAksa, TR) were that its fiber density was 6 K (6000 filaments), and its modulus, tensile strength, and breaking elongation were 240 GPa, 4200 MPa, and 1.8%, respectively. 104 All composite specimens were prepared as unstitched base (TBU and TPU), stitched base (TB-CS, TB-TS, TP-CS, and TP-TS), unstitched nano (TBU-N and TPU-N), and stitched nano (TB-CS-N, TB-TS-N, TP-CS-N, and TP-TS-N). They were principally composed of six-layered biaxial (0 /90 ) either basket(2/2) or plain(1/1) prepreged structures.…”

Short-beam shear of nanoprepreg/nanostitched three-dimensional carbon/epoxy multiwall carbon nanotube composites

“…For manufacturing the composite samples, first, an epoxy and MWCNTs mixture was prepared. More information on the composite fabrication was presented by Bilisik et al 66 In this paper, there is a short explanation to avoid repetition for readers. It was noteworthy that the MWCNTs ratio (0.03125%) and stirring time (120 min) used in this study was chosen after rigorous attempts to minimize the agglomeration of the MWCNTs.…”

“…The suppliers and specifications of the carbon fibers, fabrics, epoxy resin and nanotubes 66. PAN-based carbon fibers…”

Plant-Based Natural Fibre Reinforced Composites: A Review on Fabrication, Properties and Applications

“…The composites show better physicochemical properties if suitable interactions between the fibre and the matrix are provided [68,98]. Furthermore, fibre types, length, diameter, density, modulus, strength, fibre orientation [99][100][101] and weave structures [102][103][104] significantly control the mechanical properties of NFRCs. While NFRCs are fabricated using the hydrophilic cellulosic fibres and the hydrophobic polymer matrices, very often they result in poor interfacial adhesion [105] and consequently poor mechanical properties [106][107][108].…”