Radial stress

Radial stress is stress towards or away from the central axis of a component.
Pressure vessels.
The walls of pressure vessels generally undergo triaxial loading. For cylindrical pressure vessels, the normal loads on a wall element are:
The radial stress for a thick-walled cylinder is equal and opposite to the gauge pressure on the inside surface, and zero on the outside surface. The circumferential stress and longitudinal stresses are usually much larger for pressure vessels, and so for thin-walled instances, radial stress is usually neglected.
Formula.
The radial stress for a thick walled pipe at a point formula_1 from the central axis is given by
where formula_3 is the inner radius, formula_4 is the outer radius, formula_5 is the inner absolute pressure and formula_6 is the outer absolute pressure. Maximum radial stress occurs when formula_7 (at the inside surface) and is equal to gauge pressure, or formula_8.