Fig.1

CNT thin film sample and its surface microscopic morphology

Fig.2

SEM characterization of CNT films with different concentrations of epoxy resin

Fig.3

Physical diagram of experimental instrument

Fig.4

Process of steel ball impacting pure CNT film

Fig.5

Bullet velocity calculation method

Fig.6

Finite element model of steel ball impact film

Table 1

Material constants used in finite element analysis

Fig.7

High-speed impact response process of epoxy CNT film captured by high-speed camera

Fig.8

Numerical simulation of high-speed impact response process of epoxy CNT film

Fig.9

Comparison of simulation results and experimental results of initial velocity-residual velocity relation

Fig.10

Initial velocity-residual velocity curves of steel ball impacting CNT resin composite film

Fig.11

Comparison of energy absorption of CNT films with different epoxy resin concentrations impacted by steel balls

Fig.12

Specific absorption energy of CNT films with different concentrations of epoxy resin

Fig.13

Macroscopic appearance of CNT film pattern surface at each concentration after penetration

Fig.14

High-speed camera images of CNT films with different concentrations penetrated at same time point

Fig.15

Simulation results of 40 m/s steel ball impact on pure CNT film

Fig.16

Simulation results of 150m/s steel ball impact on pure CNT film

Fig.17

Tensile stress and shear stress cloud maps of pure CNT films impacted by 40 m/s and 150 m/s steel balls （T=0.12 ms）

Fig.18

Simulation results of 40 m/s steel ball impacting 80% epoxy CNT film

Fig.19

Simulation results of 150 m/s steel ball impacting 80% epoxy CNT film

Fig.20

Tensile stress and shear stress cloud map of 80% epoxy CNT films impacted by 40 m/s and 150 m/s steel balls （T=0.12 ms）

Fig.21

SEM characterization of epoxy CNT film fracture at different concentrations