Analysis of the Swage Autofrettage Process

摘要

The autofrettage process is a well-known method to improve the working strengthand fatigue life of thick-walled cylinders. In the conventional viewpoint, the cylinder is pressurized beyond its elastic limit in order to produce a beneficial residual stress pattern with large compressive hoop stresses at the bore. In practice, this has been accomplished by the swage process in which an oversized tungsten carbide mandrel is pressed through the bore to produce a similar effect. The analysis of this problem has not been possible until the development of high-level finite element codes and high-performance vectorized computers. This combination was utilized to accomplish a detailed analysis of the swage process in a short section of a 105-mm cannon tube. Residual Stress, Autofrettage, High Pressure, Swage, Thick Wall.