Post oblique ballistic impact behaviour of hybrid composite plates reinforced with carbon nanotubes
The present experimental investigation endeavoured to examine the tensile, compression, and 3-point bending strength of the laminates made of carbon/Kevlar hybrid reinforced textiles with carbon nanotubes (CNTs) fillers subjected to oblique ballistic impact loads. The advanced nano-fillers were c...
| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/104056/ http://psasir.upm.edu.my/id/eprint/104056/1/FK%202022%2099%20IR.pdf |
| _version_ | 1848864181997010944 |
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| author | Randjbaran, Elias |
| author_facet | Randjbaran, Elias |
| author_sort | Randjbaran, Elias |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The present experimental investigation endeavoured to examine the tensile,
compression, and 3-point bending strength of the laminates made of carbon/Kevlar
hybrid reinforced textiles with carbon nanotubes (CNTs) fillers subjected to oblique
ballistic impact loads. The advanced nano-fillers were chosen as reinforcement for the
carbon/Kevlar hybrid textile composite because of their high Young's modulus.
Although there are a number of experimental investigations on tensile properties of
CNTs, the coupling effects of CNTs and oblique impacts on tensile, compression, and 3-
point bending strengths have not been examined yet. Consequently, individual oblique
impacts ranging from 0 to 40 degrees were conducted on the composite plates made-up
of fabrics with diverse volumes of CNTs, which ranged from 0.1% to 1.5%. The plates
were fabricated with eight layers of equal thickness arranged in different percentages of
CNTs and neat epoxy resin. A conical steel projectile at dimensions of 15 mm length and
10 mm diametre was considered for a high velocity impact. While the projectile was
placed very close to the plates, i.e. at their centres, they were impacted at sundry speeds.
The modulus of elasticity and toughness were calculated for the stress-strain curves
obtained from the mechanical tests. In the progress of the experiments, the variation of
the kinetic energy, the increase in the internal energy of the laminates, and the decrease
in the velocity of the projectile with disparate angles were examined. Results from the
experimental tests indicated that the kinetic energy absorption of the projectile increased
by 38% with the increase of the oblique angle of 40 degrees at 0.3% CNTs' desperation.
The optimum dispersion of the CNTs fillers was 0.3% and by adding the CNTs, the
kinetic energy absorption increased by about 35%. Additionally, the inclusion of the
CNTs' fillers by 1.5% resulted in improving the compressive toughness of the specimens
more than triple times. The increase of CNTs fillers by 1.5% caused the decrease of the
tensile strength and toughness by 86%. Moreover, the incorporation of 1.5% of CNTs
caused the increase of the flexural bending toughness of the specimens more than four
times. Simultaneously, the flexural modulus of elasticity decreased by up to 38%. The
incorporation of CNTs by 1.5% increased the flexural bending toughness more than four
times; however, the flexural modulus of elasticity decreased by up to 38%. |
| first_indexed | 2025-11-15T13:44:44Z |
| format | Thesis |
| id | upm-104056 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T13:44:44Z |
| publishDate | 2022 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-1040562023-07-07T02:20:51Z http://psasir.upm.edu.my/id/eprint/104056/ Post oblique ballistic impact behaviour of hybrid composite plates reinforced with carbon nanotubes Randjbaran, Elias The present experimental investigation endeavoured to examine the tensile, compression, and 3-point bending strength of the laminates made of carbon/Kevlar hybrid reinforced textiles with carbon nanotubes (CNTs) fillers subjected to oblique ballistic impact loads. The advanced nano-fillers were chosen as reinforcement for the carbon/Kevlar hybrid textile composite because of their high Young's modulus. Although there are a number of experimental investigations on tensile properties of CNTs, the coupling effects of CNTs and oblique impacts on tensile, compression, and 3- point bending strengths have not been examined yet. Consequently, individual oblique impacts ranging from 0 to 40 degrees were conducted on the composite plates made-up of fabrics with diverse volumes of CNTs, which ranged from 0.1% to 1.5%. The plates were fabricated with eight layers of equal thickness arranged in different percentages of CNTs and neat epoxy resin. A conical steel projectile at dimensions of 15 mm length and 10 mm diametre was considered for a high velocity impact. While the projectile was placed very close to the plates, i.e. at their centres, they were impacted at sundry speeds. The modulus of elasticity and toughness were calculated for the stress-strain curves obtained from the mechanical tests. In the progress of the experiments, the variation of the kinetic energy, the increase in the internal energy of the laminates, and the decrease in the velocity of the projectile with disparate angles were examined. Results from the experimental tests indicated that the kinetic energy absorption of the projectile increased by 38% with the increase of the oblique angle of 40 degrees at 0.3% CNTs' desperation. The optimum dispersion of the CNTs fillers was 0.3% and by adding the CNTs, the kinetic energy absorption increased by about 35%. Additionally, the inclusion of the CNTs' fillers by 1.5% resulted in improving the compressive toughness of the specimens more than triple times. The increase of CNTs fillers by 1.5% caused the decrease of the tensile strength and toughness by 86%. Moreover, the incorporation of 1.5% of CNTs caused the increase of the flexural bending toughness of the specimens more than four times. Simultaneously, the flexural modulus of elasticity decreased by up to 38%. The incorporation of CNTs by 1.5% increased the flexural bending toughness more than four times; however, the flexural modulus of elasticity decreased by up to 38%. 2022-01 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/104056/1/FK%202022%2099%20IR.pdf Randjbaran, Elias (2022) Post oblique ballistic impact behaviour of hybrid composite plates reinforced with carbon nanotubes. Doctoral thesis, Universiti Putra Malaysia. Nanotubes - Impact testing Carbon nanotubes |
| spellingShingle | Nanotubes - Impact testing Carbon nanotubes Randjbaran, Elias Post oblique ballistic impact behaviour of hybrid composite plates reinforced with carbon nanotubes |
| title | Post oblique ballistic impact behaviour of hybrid composite plates reinforced with carbon nanotubes |
| title_full | Post oblique ballistic impact behaviour of hybrid composite plates reinforced with carbon nanotubes |
| title_fullStr | Post oblique ballistic impact behaviour of hybrid composite plates reinforced with carbon nanotubes |
| title_full_unstemmed | Post oblique ballistic impact behaviour of hybrid composite plates reinforced with carbon nanotubes |
| title_short | Post oblique ballistic impact behaviour of hybrid composite plates reinforced with carbon nanotubes |
| title_sort | post oblique ballistic impact behaviour of hybrid composite plates reinforced with carbon nanotubes |
| topic | Nanotubes - Impact testing Carbon nanotubes |
| url | http://psasir.upm.edu.my/id/eprint/104056/ http://psasir.upm.edu.my/id/eprint/104056/1/FK%202022%2099%20IR.pdf |