Plastic analysis of filled, reinforced, circular cylindrical shells

Circular cylindrical shells made of anisotropic plastic material and filled with an incompressible fluid are subjected to a ring of load which is centrally located. The anisotropic material is a model of a composite material consisting of a ductile matrix reinforced either circumferentially or longitudinally with ductile fibers. Limit loads for all sizes of shell are obtained and their dependence on the degree of reinforcement is determined. The presence of the fluid considerably increases the limit loads over those for unfilled shells. The limitation due to finite transverse shearing stress is considered and is shown to have a significant effect on the strength of such structures.