Boro-silicate glass samples were
coated with chemically treated multi-walled carbon nanotubes (MWCNTs) to study
the resistance offered by the coatings under the high strain rate impact. Impact
testing of these glass samples was performed on Split Hopkinson Pressure Bar (SHPB), where strain rates were
varied from 500/s to 3300/s. However, the comparisons were limited to samples subjected
to a strain rate of 2300/s to 3000/s so that the effect of only variable deposits
of coatings on the stress-strain behavior of glass can be studied. Variable
deposits (0.1 mg to 0.8 mg) of MWCNTs were coated uniformly on
glass samples having a disc
shape with a fixed surface area (79 mm2) to
observe the effect of the coating on the impact absorption capacity of glass. It
was observed that the small thickness of about 25 μm formed due to the fact that 0.2 mg of MWCNTs deposit spread over the surface increased the impact
of the glass pieces by nearly 70%. However, beyond this amount when the deposit was increased to 0.4 mg, the coating thickness got doubled to nearly 49 μm and this led to a fall in absorption capacity
which remained static till 0.8 mg deposit.
However, even this decrease in capacity was able to absorb 30% more impact than
offered by pure glass sample.
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