PSI - Issue 35

Kadir Bilisik et al. / Procedia Structural Integrity 35 (2022) 210–218 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

212

3

moisture evaporation; nanotube added matrix application in the yarn and fabric; nano yarn and nanoprepreg preparation; nanopreforming and curing under pressure, Bilisik et al. (2018). Therefore, carbon nanotubes were placed in the through-the-thickness of the composite via aramid filament assemblages. It is considered as simple and viable method compared to the complex transfer-printing, Garcia et al. (2008).

Table 1. Some of the specifications of 3D aramid preforms and aramid/phenolic composites. Composite code Nano material Interlacement pattern Stitching yarns Number of layer and orientation sequence

Apparent density (g.cm -3 )

Fiber weight fraction (%)

Stitching fiber weight fraction (%)

TBU (Base)

-

-

Basket

1.31

67.7

-

[(0°/90°)] 6

TB-TS (Stitched)

-

Basket

Twaron CT

1.30

65.7

1.62

[(0°/90°)] 6

TBU-N (Nano)

MWCNTs (0.03125) MWCNTs (0.03125)

Basket

-

1.32

71.4

-

[(0°/90°)] 6

TB-TS-N (Stitched nano)

Basket

Twaron CT

1.33

70.2

1.50

[(0°/90°)] 6

Fig. 1. Nanostitch p-aramid/phenolic MWCNTs composites, schematic, Bilisik et al. (2018).

2.2. In-plane shear test American Society for Testing and Materials D3518/D 3518M-94 and American Society for Testing and Materials D3039 were followed by employing a Universal Testing Machine (Shimadzu AG-XD 50, JP). Sample on the instrument was angularly placed (±45 ° ) to generate in-plane shear data as illustrated in Figure 2(a-b). Shear strength ( τ 12 m ), shear modulus (G 12 ) and shear strain (γ 12 ) are presented in Equations (1-3), ASTM D3518M-13.