This paper explores the merits of combining highmodulus
polyethylene (HMPE) fibres and glass fibr... more This paper explores the merits of combining highmodulus polyethylene (HMPE) fibres and glass fibres to form hybrid composites. Of particular interest was the effect of the various proportions of each fibre on the impact properties of the hybrid composites. Plasma treatment was used to investigate the effect of fibre/matrix adhesion on the hybridisation. The major conclusion of the work is that the 100% untreated HMPE composite shows the maximum energy absorption. However, when other properties, such as flexural strength, are taken into consideration the plasma-treated HMPE fibre composite with a few layers of glass at the centre offers the best compromise of properties.
The polymer matrix composites have been widely used for many applications. These are light in wei... more The polymer matrix composites have been widely used for many applications. These are light in weight and easy for manufacturing. The hybrid fiber reinforced composites have been prepared to enhance the mechanical, thermal, damping properties compared to single-fiber reinforced composites. The fiber reinforced hybrid composites consist of two or more fiber in a matrix system. The different fibers were reinforced with suitable matrix for preparing the hybrid composites using various manufacturing methodology. The hybrid composites are used for many application and replacing wood, wood fiber composites and conventional materials. The mechanical properties (tensile, flexural and impact), dynamic, tribological and water absorption properties of natural fiber reinforced hybrid polymer composites and natural/ synthetic fiber reinforced hybrid polymer composites were reported.
The low-velocity impact behaviour of hybrid laminates reinforced with woven aramid and basalt fab... more The low-velocity impact behaviour of hybrid laminates reinforced with woven aramid and basalt fabrics and manufactured byresin transfer moulding was studied.Specimens with different stacking sequences were tested atthree different energies,namely 5,12.5 and 25J.Residual post-impact properties ofthe different configurations ofaramid/basalt hybrid laminates were characterized byquasi static four point bending tests.Post-impact flexuraltests have been monitored using acoustic emission inorder toget fur- ther information on failure mechanisms.Results indicate that hybrid laminates with intercalated config- uration (alternatingsequence ofbasalt and aramid fabrics)have better impact energy absorption capability and enhanced damage toleranc ewith respect tothe all- aramid laminates,while basalt and hybrid laminates with sandwich-like configuration (sevenbasalt fabric layers atthe centre ofthe lami- nate as core and three aramid fabric layers for each side ofthe composite asskins)present the most favou rable flexuralbehaviour.
Composites have been widely used in applications where there is a risk of impact, due to the exce... more Composites have been widely used in applications where there is a risk of impact, due to the excellent properties these materials display for absorbing impact energy. However, composites during impact situations typically generate an enormous number of small pieces, due to the energy absorption mechanism of these materials, a mechanism which does not include plastic deformation. This can prove dangerous in sports competitions, where the small fragments of the original structure may harm competitors. This study was designed to explore the possibility of incorporating a material which, whilst maintaining a high level of energy absorption without any plastic deformation mechanism, was able to maintain its original form, or at least significantly reduce the number of pieces generated after impact. The addition of a polyamide layer, NOMEX®, to a monolithic fabric laminate was investigated in this paper. The process of fabrication is described and the different properties of the material under consideration: interlaminar fracture toughness energy (GIC), indentation (id) and delamination after impact (Ai) and compression after impact (sCAI), were measured and compared with those of the original monolithic fabric.
This paper explores the merits of combining highmodulus
polyethylene (HMPE) fibres and glass fibr... more This paper explores the merits of combining highmodulus polyethylene (HMPE) fibres and glass fibres to form hybrid composites. Of particular interest was the effect of the various proportions of each fibre on the impact properties of the hybrid composites. Plasma treatment was used to investigate the effect of fibre/matrix adhesion on the hybridisation. The major conclusion of the work is that the 100% untreated HMPE composite shows the maximum energy absorption. However, when other properties, such as flexural strength, are taken into consideration the plasma-treated HMPE fibre composite with a few layers of glass at the centre offers the best compromise of properties.
The polymer matrix composites have been widely used for many applications. These are light in wei... more The polymer matrix composites have been widely used for many applications. These are light in weight and easy for manufacturing. The hybrid fiber reinforced composites have been prepared to enhance the mechanical, thermal, damping properties compared to single-fiber reinforced composites. The fiber reinforced hybrid composites consist of two or more fiber in a matrix system. The different fibers were reinforced with suitable matrix for preparing the hybrid composites using various manufacturing methodology. The hybrid composites are used for many application and replacing wood, wood fiber composites and conventional materials. The mechanical properties (tensile, flexural and impact), dynamic, tribological and water absorption properties of natural fiber reinforced hybrid polymer composites and natural/ synthetic fiber reinforced hybrid polymer composites were reported.
The low-velocity impact behaviour of hybrid laminates reinforced with woven aramid and basalt fab... more The low-velocity impact behaviour of hybrid laminates reinforced with woven aramid and basalt fabrics and manufactured byresin transfer moulding was studied.Specimens with different stacking sequences were tested atthree different energies,namely 5,12.5 and 25J.Residual post-impact properties ofthe different configurations ofaramid/basalt hybrid laminates were characterized byquasi static four point bending tests.Post-impact flexuraltests have been monitored using acoustic emission inorder toget fur- ther information on failure mechanisms.Results indicate that hybrid laminates with intercalated config- uration (alternatingsequence ofbasalt and aramid fabrics)have better impact energy absorption capability and enhanced damage toleranc ewith respect tothe all- aramid laminates,while basalt and hybrid laminates with sandwich-like configuration (sevenbasalt fabric layers atthe centre ofthe lami- nate as core and three aramid fabric layers for each side ofthe composite asskins)present the most favou rable flexuralbehaviour.
Composites have been widely used in applications where there is a risk of impact, due to the exce... more Composites have been widely used in applications where there is a risk of impact, due to the excellent properties these materials display for absorbing impact energy. However, composites during impact situations typically generate an enormous number of small pieces, due to the energy absorption mechanism of these materials, a mechanism which does not include plastic deformation. This can prove dangerous in sports competitions, where the small fragments of the original structure may harm competitors. This study was designed to explore the possibility of incorporating a material which, whilst maintaining a high level of energy absorption without any plastic deformation mechanism, was able to maintain its original form, or at least significantly reduce the number of pieces generated after impact. The addition of a polyamide layer, NOMEX®, to a monolithic fabric laminate was investigated in this paper. The process of fabrication is described and the different properties of the material under consideration: interlaminar fracture toughness energy (GIC), indentation (id) and delamination after impact (Ai) and compression after impact (sCAI), were measured and compared with those of the original monolithic fabric.
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Papers by Jamal Rahimi
polyethylene (HMPE) fibres and glass fibres
to form hybrid composites. Of particular interest was
the effect of the various proportions of each fibre on the
impact properties of the hybrid composites. Plasma
treatment was used to investigate the effect of
fibre/matrix adhesion on the hybridisation.
The major conclusion of the work is that the 100%
untreated HMPE composite shows the maximum
energy absorption. However, when other properties,
such as flexural strength, are taken into consideration
the plasma-treated HMPE fibre composite with a few
layers of glass at the centre offers the best compromise
of properties.
manufacturing. The hybrid fiber reinforced composites have been prepared to enhance the mechanical, thermal, damping
properties compared to single-fiber reinforced composites. The fiber reinforced hybrid composites consist of two or
more fiber in a matrix system. The different fibers were reinforced with suitable matrix for preparing the hybrid
composites using various manufacturing methodology. The hybrid composites are used for many application and replacing
wood, wood fiber composites and conventional materials. The mechanical properties (tensile, flexural and impact),
dynamic, tribological and water absorption properties of natural fiber reinforced hybrid polymer composites and natural/
synthetic fiber reinforced hybrid polymer composites were reported.
and manufactured byresin transfer moulding was studied.Specimens with different stacking sequences
were tested atthree different energies,namely 5,12.5 and 25J.Residual post-impact properties ofthe
different configurations ofaramid/basalt hybrid laminates were characterized byquasi static four point
bending tests.Post-impact flexuraltests have been monitored using acoustic emission inorder toget fur-
ther information on failure mechanisms.Results indicate that hybrid laminates with intercalated config-
uration (alternatingsequence ofbasalt and aramid fabrics)have better impact energy absorption
capability and enhanced damage toleranc ewith respect tothe all- aramid laminates,while basalt and
hybrid laminates with sandwich-like configuration (sevenbasalt fabric layers atthe centre ofthe lami-
nate as core and three aramid fabric layers for each side ofthe composite asskins)present the most
favou rable flexuralbehaviour.
properties these materials display for absorbing impact energy. However, composites during impact
situations typically generate an enormous number of small pieces, due to the energy absorption
mechanism of these materials, a mechanism which does not include plastic deformation. This can prove
dangerous in sports competitions, where the small fragments of the original structure may harm
competitors.
This study was designed to explore the possibility of incorporating a material which, whilst maintaining
a high level of energy absorption without any plastic deformation mechanism, was able to
maintain its original form, or at least significantly reduce the number of pieces generated after impact.
The addition of a polyamide layer, NOMEX®, to a monolithic fabric laminate was investigated in this
paper. The process of fabrication is described and the different properties of the material under
consideration: interlaminar fracture toughness energy (GIC), indentation (id) and delamination after
impact (Ai) and compression after impact (sCAI), were measured and compared with those of the original
monolithic fabric.
polyethylene (HMPE) fibres and glass fibres
to form hybrid composites. Of particular interest was
the effect of the various proportions of each fibre on the
impact properties of the hybrid composites. Plasma
treatment was used to investigate the effect of
fibre/matrix adhesion on the hybridisation.
The major conclusion of the work is that the 100%
untreated HMPE composite shows the maximum
energy absorption. However, when other properties,
such as flexural strength, are taken into consideration
the plasma-treated HMPE fibre composite with a few
layers of glass at the centre offers the best compromise
of properties.
manufacturing. The hybrid fiber reinforced composites have been prepared to enhance the mechanical, thermal, damping
properties compared to single-fiber reinforced composites. The fiber reinforced hybrid composites consist of two or
more fiber in a matrix system. The different fibers were reinforced with suitable matrix for preparing the hybrid
composites using various manufacturing methodology. The hybrid composites are used for many application and replacing
wood, wood fiber composites and conventional materials. The mechanical properties (tensile, flexural and impact),
dynamic, tribological and water absorption properties of natural fiber reinforced hybrid polymer composites and natural/
synthetic fiber reinforced hybrid polymer composites were reported.
and manufactured byresin transfer moulding was studied.Specimens with different stacking sequences
were tested atthree different energies,namely 5,12.5 and 25J.Residual post-impact properties ofthe
different configurations ofaramid/basalt hybrid laminates were characterized byquasi static four point
bending tests.Post-impact flexuraltests have been monitored using acoustic emission inorder toget fur-
ther information on failure mechanisms.Results indicate that hybrid laminates with intercalated config-
uration (alternatingsequence ofbasalt and aramid fabrics)have better impact energy absorption
capability and enhanced damage toleranc ewith respect tothe all- aramid laminates,while basalt and
hybrid laminates with sandwich-like configuration (sevenbasalt fabric layers atthe centre ofthe lami-
nate as core and three aramid fabric layers for each side ofthe composite asskins)present the most
favou rable flexuralbehaviour.
properties these materials display for absorbing impact energy. However, composites during impact
situations typically generate an enormous number of small pieces, due to the energy absorption
mechanism of these materials, a mechanism which does not include plastic deformation. This can prove
dangerous in sports competitions, where the small fragments of the original structure may harm
competitors.
This study was designed to explore the possibility of incorporating a material which, whilst maintaining
a high level of energy absorption without any plastic deformation mechanism, was able to
maintain its original form, or at least significantly reduce the number of pieces generated after impact.
The addition of a polyamide layer, NOMEX®, to a monolithic fabric laminate was investigated in this
paper. The process of fabrication is described and the different properties of the material under
consideration: interlaminar fracture toughness energy (GIC), indentation (id) and delamination after
impact (Ai) and compression after impact (sCAI), were measured and compared with those of the original
monolithic fabric.