**Introduction:**

The deformation in an element cut out by two adjacent cross-sections does not interfere with the adjacent element.

**Description:**

**Radial and circumferential stress distribution within the cylinder wall when only internal pressure acts.**

It may be noted that σr σθ = constant and hence the deformation in z-direction is uniform.

This means that the cross-section perpendicular to the cylinder axis remains plane. Hence the deformation in an element cut out by two adjacent cross-sections does not interfere with the adjacent element.

If pi = 0 i.e. there is no internal pressure the stresses σr and σθ reduce to

The stress distributions are shown in figure below:

**Distribution of radial and circumferential stresses within the cylinder wall when only external pressure acts.**