Characterization of carbon nanotube epoxy composites and carbon nanotubes/laminated carbon fibre epoxy composites
Over the last few decades carbon fibre reinforced polymer (CFRP) was used extensively because it offers attractive mechanical and thermal properties. Aircraft and some of high-end automobile constructions used CFRP, as it has an ability to be stuctured to aerodynamic efficient confi...
| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/85576/ http://psasir.upm.edu.my/id/eprint/85576/1/FK%202020%2027%20-%20ir.pdf |
| _version_ | 1848860122841874432 |
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| author | Mohd Tamyis, Najihah |
| author_facet | Mohd Tamyis, Najihah |
| author_sort | Mohd Tamyis, Najihah |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Over the last few decades carbon fibre reinforced polymer (CFRP) was used
extensively because it offers attractive mechanical and thermal properties. Aircraft and some of
high-end automobile constructions used CFRP, as it has an ability to be stuctured to aerodynamic
efficient configurations. However, multi –layer laminates failure behavior is complex
especially woven fabric composites. CFRPs’ typical failure modes include matrix fracture,
interface debonding between fibre and matrix and interlaminar delamination. One of the
techniques to overcome such failure modes is by reinforcing the composites with
nanoparticles. In this study, the objective is to develop a tougher resin by dispersing
multiwalled carbon nanotubes (MWCNTs) into the resin which will improve the properties of CFRP
composites. Two types of MWCNTs were used which lengths, a) MWCNT_long (length 10-30 μm) and b)
MWCNT_short (length 0.5-2 μm).
There are two main parts in this thesis i.e., the investigation of mechanical and
thermal properties of MWCNT_modified-epoxy and the investigation of mechanical properties of the
MWCNT_filled-CFRP composite with an emphasis on interlaminar shear strength behaviour.
In the first part, an experiment was conducted to investigate the dispersion quality of MWCNTs as
nanofillers in the resin systems. The effect of MWCNTs on compressive and
flexural properties of epoxy polymers were studied. The epoxy resin used was Epikote
828 and dapsone (DDS) as the hardener. The thermal properties of MWCNT_modified-Epikote 828
as compared to Epikote828/DDS neat systems were also investigated. From the results, the addition
of MWCNT_short into
Epikote 828 has significantly enhanced the compressive and flexural modulus.
The second investigation was done to study the effect of MWCNT on the
interlaminar shear strength (ILSS) properties of Epikote828/CFRP composite. A number of
plane weave carbon fibre (CF) laminates were fabricated using the hand- layup technique, wet
resin impregnation and vacuum bagging techniques. The quality of laminate such as void
content, fibre and MWCNTs volume fraction was examined. Short beam shear (SBS) test was performed
on the plane weave laminates to test the quality of ILSS. It was
found that the ILSS of MWCNT_short/Epikote828/CF CFRP composite was
better than the neat Epikote828/DDS CFRP composites. The addition of 0.38% of
MWCNT_short
improved the ILSS of the CF/Epikote828 by 14 %. |
| first_indexed | 2025-11-15T12:40:13Z |
| format | Thesis |
| id | upm-85576 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T12:40:13Z |
| publishDate | 2019 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-855762021-12-10T03:36:42Z http://psasir.upm.edu.my/id/eprint/85576/ Characterization of carbon nanotube epoxy composites and carbon nanotubes/laminated carbon fibre epoxy composites Mohd Tamyis, Najihah Over the last few decades carbon fibre reinforced polymer (CFRP) was used extensively because it offers attractive mechanical and thermal properties. Aircraft and some of high-end automobile constructions used CFRP, as it has an ability to be stuctured to aerodynamic efficient configurations. However, multi –layer laminates failure behavior is complex especially woven fabric composites. CFRPs’ typical failure modes include matrix fracture, interface debonding between fibre and matrix and interlaminar delamination. One of the techniques to overcome such failure modes is by reinforcing the composites with nanoparticles. In this study, the objective is to develop a tougher resin by dispersing multiwalled carbon nanotubes (MWCNTs) into the resin which will improve the properties of CFRP composites. Two types of MWCNTs were used which lengths, a) MWCNT_long (length 10-30 μm) and b) MWCNT_short (length 0.5-2 μm). There are two main parts in this thesis i.e., the investigation of mechanical and thermal properties of MWCNT_modified-epoxy and the investigation of mechanical properties of the MWCNT_filled-CFRP composite with an emphasis on interlaminar shear strength behaviour. In the first part, an experiment was conducted to investigate the dispersion quality of MWCNTs as nanofillers in the resin systems. The effect of MWCNTs on compressive and flexural properties of epoxy polymers were studied. The epoxy resin used was Epikote 828 and dapsone (DDS) as the hardener. The thermal properties of MWCNT_modified-Epikote 828 as compared to Epikote828/DDS neat systems were also investigated. From the results, the addition of MWCNT_short into Epikote 828 has significantly enhanced the compressive and flexural modulus. The second investigation was done to study the effect of MWCNT on the interlaminar shear strength (ILSS) properties of Epikote828/CFRP composite. A number of plane weave carbon fibre (CF) laminates were fabricated using the hand- layup technique, wet resin impregnation and vacuum bagging techniques. The quality of laminate such as void content, fibre and MWCNTs volume fraction was examined. Short beam shear (SBS) test was performed on the plane weave laminates to test the quality of ILSS. It was found that the ILSS of MWCNT_short/Epikote828/CF CFRP composite was better than the neat Epikote828/DDS CFRP composites. The addition of 0.38% of MWCNT_short improved the ILSS of the CF/Epikote828 by 14 %. 2019-08 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/85576/1/FK%202020%2027%20-%20ir.pdf Mohd Tamyis, Najihah (2019) Characterization of carbon nanotube epoxy composites and carbon nanotubes/laminated carbon fibre epoxy composites. Doctoral thesis, Universiti Putra Malaysia. Carbon fibers Epoxy resins Composite materials |
| spellingShingle | Carbon fibers Epoxy resins Composite materials Mohd Tamyis, Najihah Characterization of carbon nanotube epoxy composites and carbon nanotubes/laminated carbon fibre epoxy composites |
| title | Characterization of carbon nanotube epoxy composites and carbon nanotubes/laminated carbon fibre epoxy composites |
| title_full | Characterization of carbon nanotube epoxy composites and carbon nanotubes/laminated carbon fibre epoxy composites |
| title_fullStr | Characterization of carbon nanotube epoxy composites and carbon nanotubes/laminated carbon fibre epoxy composites |
| title_full_unstemmed | Characterization of carbon nanotube epoxy composites and carbon nanotubes/laminated carbon fibre epoxy composites |
| title_short | Characterization of carbon nanotube epoxy composites and carbon nanotubes/laminated carbon fibre epoxy composites |
| title_sort | characterization of carbon nanotube epoxy composites and carbon nanotubes/laminated carbon fibre epoxy composites |
| topic | Carbon fibers Epoxy resins Composite materials |
| url | http://psasir.upm.edu.my/id/eprint/85576/ http://psasir.upm.edu.my/id/eprint/85576/1/FK%202020%2027%20-%20ir.pdf |