ADVANCED MATERIALS & PROCESSES | JULY/AUGUST 2024 26 Fig. 3 — (a) DFTB-computed models of cross-links (purple atoms) bridging holey graphitic bi-layers with various numbers of vacancies (V): V2 (left), V14 (center), and V28 (right). The in-plane Young’s moduli is provided above each structure. The inset shows a side view of the cross-link. (b) Distinct element (gray cylinders) representation of two cross-linked CNT portions, with elasticity of cross-link and perforated wall captured by atomistical- informed shear ks and linear kn springs (left); a 40-nm-long bundle with CNT discontinuities and cross-links. (Right) (c) mDEM computation of the Young’s modulus of the bundle vs. number of cross-links[6]. Fig. 4 — (a) Specific tensile strength and modulus of unidirectional CNT yarn composite fabricated with different doses of gamma-ray irradiation. (b) Comparison of unidirectional gamma-ray irradiated CNT yarn composites with unidirectional CF composites (60 vol% fiber volume fraction) and metal alloys[6]. (c) (b) (a) (b) (a)
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