Wpływ skończonego wstępnego sprężenia na sztywność rury

A thick-walled tube is initially stressed by cutting out (or inserting) of a wedge-shaped inclusion with an arbitrary vertex angle: the edges of the cut are welded together. The tube is then subject to a small uniform compression. The influence of the initial stresses on the elastic properties of the tube is investigated; the corresponding formulae and graphs are given.