WEIGHT DESIGN OF PRESSURE VESSEL WITH CONSTRAINTS ON STIFFNESS
A. Krikanov and S. R. Soni
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
(±?) angle lay ups. It is proven 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 purposes, 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.