Method, system, and computer program product for calculating the residual stress equilibrium of two concentric cylinders coldworked by a loading-unloading expansion process

A system for determining a residual stress state of two elastoplastic cylinders coldworked by an expansion process, said system comprising:

• means for calculating whether a loading step of the expansion process will result in interference of an inner cylinder with an outer cylinder;
• means for calculating whether an unloading step of the expansion process will result in assembly of the inner cylinder with the outer cylinder;
• means for calculating a residual stress state in the inner cylinder and the outer cylinder;
• and
• means for recording said residual stress state of the inner cylinder and the outer cylinder.

A method for determining a residual stress state of two cylinders initially clearance fitted and then involved in a loading-unloading process, said comprising the steps of:

• providing an inner cylinder and an outer cylinder;
• calculating whether a first assembly step of applying an internal expansion load to the inner cylinder will result in interference of the inner cylinder with the outer cylinder;
• calculating whether a second assembly step of unloading the internal expansion load will result in assembly of the inner cylinder with the outer cylinder;
• calculating residual stress state data in the inner cylinder and the outer cylinder;
• and
• recording said residual stress state data of the inner cylinder and the outer cylinder.