In-plane shear of nanoprepreg/nanostitched three-dimensional carbon/epoxy multiwalled carbon nanotubes composites

Abstract

The in-plane shear properties of nanostitched three-dimensional (3D) carbon/epoxy composites were investigated. Adding the stitching fiber or multiwalled carbon nanotubes or nanostitched fiber into carbon fabric preform slightly improved the shear strength and modulus of stitched and stitched nanocomposites. The in-plane shear fracture of the base and nanostructures was extensive delamination and tensile fiber failures in the sheared region. But, the stitched and stitched nanocomposites had angular deformation of the stitching yarns in the fiber scissoring areas, shear hackles in the matrix and successive fiber breakages in the interlayers. Probably, this mechanism prohibited extensive interlayer opening in the nanostitched composites. The results exhibited that introducing the stitching fiber (1.44%) and multiwalled carbon nanotubes (0.03125%) in the base structure enhanced its transverse fracture properties as a form of confined delamination area. Therefore, the damaged tolerance properties of the stitched nanocomposites were enhanced.

The Mechanical Properties of Kevlar Fabric/Epoxy Composites Containing Aluminosilicates Modified with Quaternary Ammonium and Phosphonium Salts

“…However, for composites containing modified bentonites, no plateau region of the shear curves and subsequent slow decrease of stress with an increase in the shear load, which is characteristic for aramid [ 9 , 59 ] as well as carbon [ 60 ] and glass [ 61 ] composites, was observed. In contrast, for composites with a modified matrix, the stress slightly increased as the deformation increased, until it ruptured.…”

Carbon nanotubes in carbon/epoxy multiscale textile preform composites: A review

“…This method was called "Nanostitching" and it is illustrated in Figure 10. [111] Figure 11 illustrates the position of the nanostitched fiber in the thickness of some failed nanostitched 3D nanocomposite after tensile and mode-I interlaminar strength tests. [53,112] F I G U R E 5 Overview of preparing carbon nanotubes (CNTs) grown onto carbon fabric.…”

“…When textile preforms are ready, they are sealed with a flexible polymer film bag. Then internal air of the sealed bag is pumped out to create a vacuum environment inside, which causes the entrapped air, excess resin to F I G U R E 8 Schematic view of processing steps of carbon nanotubes transplantation from Si transition wafer to prepregs [109] [Color figure can be viewed at wileyonlinelibrary.com] F I G U R E 9 Schematic of interleaving carbon nanotube buckypaper in the CF/BP interply hybrid composite sample [94] [Color figure can be viewed at wileyonlinelibrary.com] F I G U R E 1 0 Processing route of "nanostitching method" for making the nanostitched 3D nanocomposite, schematic [111] [Color figure can be viewed at wileyonlinelibrary.com] F I G U R E 1 1 Scanning electron microscope (SEM) images of nanostitched 3D nanocomposite. A, Nano para-aramid yarn in the thickness of the carbon nanocomposites after tensile failure (optical microscope, magnifications ×6.7).…”

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

“…For this purpose, firstly the carbon fabric prepreg and prepreg stitch yarns (nanostitching) were produced. 67 Stitching was conducted manually on the prepregs layered with a [0 /90 ] 4 sequence using PAN carbon and Twaron-nanostitched yarn. The density of stitching and the spacing of the stitch rows were 1 step/cm and 1 cm, respectively.…”