The effect of testing & environmental conditions on the properties of injection moulded glass fibre reinforced polyamide 6 composites / Asfarina Amir Hassan
Polyamide 6 (PA6) with various loading of short glass fibres, SGF (2%, 5%, 8%, 10% & 16% Vf) were prepared by injection moulding. The mechanical properties of composites were studied through tensile and impact tests. Composites were subjected to a series of mechanical tests at various testing...
| Summary: | Polyamide 6 (PA6) with various loading of short glass fibres, SGF (2%, 5%, 8%, 10%
& 16% Vf) were prepared by injection moulding. The mechanical properties of
composites were studied through tensile and impact tests. Composites were subjected to
a series of mechanical tests at various testing conditions. The aim of the investigations
was to show in which way the SGF content and testing conditions influence the
materials behaviour. For different conditions, SGF/PA6 composites were subjected to
dry as moulded (DAM), 50% RH and wet conditions. Results showed that composites
strength decreases as moisture is introduced and temperature is raised. The melting
temperatures as well as thermal stability of composites were also studied by DSC and
TGA techniques respectively. The composites were also subjected to DMA analysis to
examine the viscoelastic behaviour of materials under periodic stress. TGA analyses
revealed that the thermal stability increase with an increase in the SGF content. DSC
results showed that as the glass fibre content increases, the degree of crystallinity also
decrease. Mechanical test showed that the tensile modulus and tensile strength increase
steadily while the elongation at break decrease with an increase in the SGF content
and/or strain rate. The toughness of moulded materials was characterised using linear
elastic fracture mechanics approach. The critical strain energy release rate, (Gc)
increases as the glass fibre loading increases. The reduction in ductility and toughness
are attributed to the constrained mobility of polymer chains in the presence of SGF. |
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