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![Physical Properties of Glass-fibre Reinforced Polyester Sheet reinforced with various glass fibre constructions[7] and[8]](profile/Pius-Onyechi/publication/265640503/figure/tbl1/AS:667619489230849@1536184298512/Physical-Properties-of-Glass-fibre-Reinforced-Polyester-Sheet-reinforced-with-various.png)
Physical Properties of Glass-fibre Reinforced Polyester Sheet reinforced with various glass fibre constructions[7] and[8]
Source publication
Impact on composites is a very complex phenomenon and function of many parameters influencing its analysis.
This research developed an armour protecting body of Glass Fibre Reinforced Polyester (GFRP) co mposite laminates of
varying thicknesses of 8mm, 12m
m, 16mm, 20mm, 24mm, and 28mm. the impact response of these composites was
investigated. T...
Contexts in source publication
Context 1
... r examp le, the tensile strength at room temperature may vary fro m 69 MPa to 896 M Pa or higher, wet strength retention from 50 to 95 % and specific gravity fro m 1.2 to 1.9. The range of some physical properties is given in Table 1. They are typical for GFRP sheet materials produced with normal care fro m general purpose polyester resin and reinforced with three types of glass-fibre rein forcement. ...
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Citations
... Especially, the damage resistance and damage tolerance under impact loading are of the most importance of composite material characteristics because they are often susceptible to impact. Impact on composites is a very complex phenomenon and many parameters influence its analysis.Need exists for high performance, lightweight and cost effective protection for personnel and vehicles to improve impact absorption ability and reduce injury when subjected to a range of threats such as blast and ballistic impacts [1]. The design of composite amour is a very complex task as compared to conventional single layer metallic armour, due to the exhibition of coupling among membrane, torsion and bending strains; weak transverse shear strength, and discontinuity of mechanical properties along the thickness of the composite laminates [2]. ...
In this work, a glass fibre reinforced composite laminates was developed for amour body application. Six samples of this composite laminates were formed with thicknesses of 28mm (Sample E), 24mm (Sample D), 20mm (Sample C), 16mm (Sample B), 12mm (Sample A), and 8mm (Sample F). These samples were targeted using two types of life bullets (Ogival and Conical nosed) moving at a velocity of 355m/s. Energy absorption capacity of these composite laminates was determined as a measure of area under the stress-strain curve through the application of the Simpson's 1/3 rule. Sample E of the GFRP composite gave an optimum absorption energy capacity of 1.956 MJ after ballistic deformation (theoretical) which is greater than the kinetic energies of the conical projectile (456.676 J) and the ogival projectile (348.85 J) obtained from experimental analysis, energy absorption capacities of Samples AD were also greater then these values. This indicates the ability of the developed composites (Samples A-E) to absorb the projectiles' kinetic energy without perforation.
... Especially, the damage resistance and damage tolerance under impact loading are of the most importance of composite material characteristics because they are often susceptible to impact. Impact on composites is a very complex phenomenon and many parameters influence its analysis.Need exists for high performance, lightweight and cost effective protection for personnel and vehicles to improve impact absorption ability and reduce injury when subjected to a range of threats such as blast and ballistic impacts [1]. The design of composite amour is a very complex task as compared to conventional single layer metallic armour, due to the exhibition of coupling among membrane, torsion and bending strains; weak transverse shear strength, and discontinuity of mechanical properties along the thickness of the composite laminates [2]. ...
In this work, a glass fibre reinforced composite laminates was developed for amour body application. Six samples of this composite laminates were formed with thicknesses of 28mm (Sample E), 24mm (Sample D), 20mm (Sample C), 16mm (Sample B), 12mm (Sample A), and 8mm (Sample F). These samples were targeted using two types of life bullets (Ogival and Conical nosed) moving at a velocity of 355m/s. Energy absorption capacity of these composite laminates was determined as a measure of area under the stress-strain curve through the application of the Simpson’s 1/3 rule. Sample E of the GFRP composite gave an optimum absorption energy capacity of 1.956 MJ after ballistic deformation (theoretical) which is greater than the kinetic energies of the conical projectile (456.676 J) and the ogival projectile (348.85 J) obtained from experimental analysis, energy absorption capacities of Samples A-D were also greater then these values. This indicates the ability of the developed composites (Samples A-E) to absorb the projectiles’ kinetic energy without perforation.
This paper presents the behavior of composite panels based on glass fiber unidirectional fabrics and a bi-component epoxy resin under ballistic impacts that characterize two threat levels: FB2 and FB3, according to EN 1523:2004. The tested panels had characteristics kept in narrow ranges: thickness 18.26 ± 0.22 mm, mass ratio fabrics/panel 0.788 ± 0.015, surface density 27.51 ± 0.26 kg/m2. After testing the panels, the failure mechanisms of the panel were evidenced by scanning electron microscopy and photographs. Here the authors present a finite-element model at meso scale that was used for evaluating if the composite, initially tested at level FB2 (9 mm FMJ, v0 = 375 m/s), could withstand the higher level of impact, FB3 (projectile type 0.357 Magnum and impact velocity of v0 = 433 m/s). Simulation was performed in Explicit Dynamics (Ansys), keeping the same target but changing the projectile for the two different levels of threat. The results of the simulation were encouraging for making tests at level FB3, indicating the importance of alternating actual tests with simulations in order to achieve better protection with reduced surface weight. The simulation illustrated differences in impact duration and number of layers broken on the panel for each level. Validation of the model was based on the number of broken layers and the dimension of the delamination zone between the last two layers. Scanning electron microscopy was used for identifying failure mechanisms at the micro and meso scale. We found that damage to the composite was intensively dependent on impact velocity, this being quantitatively evaluated using the number of layers broken, the effect of delamination on separating layers and the deformation of the last layer.
