Thick Cylinders:

In this section, we will analyse cylindrical shells whose wall thickness is huge such that they may no longer be considered as thin. After described the assumptions included, we shall derive expressions for the stresses in thick cylinders. We will then workout related problems.

Assumptions

1. The diameter-thickness ratio is less than 20.

2. The material of the cylinder is isotropic and homogeneous.

3. Plane section perpendicular to the longitudinal axis of the cylinder remains plane even after the application of the internal pressure. It implies that the longitudinal strain is similar at all points of the cylinder.

4. All of fibres of the material are free to expand or contract independently without being confined by the adjacent fibres.