Composite pressure vessels with higher stiffness

Development of cost-effective composite repair system for oil/gas pipelines

New approach of pipelines joining using fiber reinforced plastics composites

This paper presents the investigation of solid rocket motor by scientists of Kaunas University of tech-nology Institute of defence technologies. Because of the mass and assembly complexity one proposes to use com-posite materials (carbon fiber) for motor case manufactur-ing. Filament winding method was implemented. For best composite performance determined optimal thickness of laminate and winding angles. For this application one uses 45°, -45°, 90° winding angle patterns, witch let exploit the composite for maximum performance from probable composite fractures. For the thermal protection one uses “tanso” graphite to shield motor nozzle from composite delamination caused by high pressure, temperature and corrosion. Thermal shielding was modelled independently from composite model but used in the final model. DOI: http://dx.doi.org/10.5755/j01.mech.20.3.7158

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Investigation of solid rocket motor strength characteristics by employing composite materials

A new design method of composite pressure vessel with constraints on stiffness and strength is proposed in this paper. A netting analysis approach is used to develop an optimization procedure. Filament wound pressure vessels are assumed to have adjacent ({+-}{phi}) angle lay ups. It is proved that laminate of two layer orientations has minimum weight. The additional constraint on strength of the first layer forming vessel`s dome is used. Minimum lamination weight is determined from the condition of active execution of two constraints. Two examples are given to obtain optimum layer orientations, thicknesses and materials. Pressure vessel without change in cylindrical diameter or length can be made. For comparison purpose, calculations of stresses are done in orthotropic material using classical lamination theory. Matrix degrades at 30 to 50% of ultimate load without fiber failure. It is allowable because elastomeric liners are used to prevent leakage due to matrix cracking.

A.A. Krikanov

Papers

Minimum weight design of pressure vessel with constraints on stiffness and strength