Abstract
The effect of filament-wound Kevlar/epoxy pressure vessels (PVs) manufactured under different temperature and relative humidity (RH) conditions, on PV burst and shear strengths, was investigated. Kevlar-49 aerospace grade fibres and (DER-330)/(Tonox 60:40)/(RD-2), an amine-cured epoxy system, were used. The PVs were manufactured under 20 and 35°C and low and high RHs (40% and 90%, respectively) conditions. Fibre content was followed by means of thermogravimetric analysis and laser equipment was used to cut some PVs for NOL ring burst and short beam shear tests. At constant temperature there was a trend toward deterioration in burst strength with a rise in RH. At constant RH, the increase in temperature led to a tendency of improvement in burst strength. No significant effect on shear strength was observed when the manufacturing environment conditions were altered.
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